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Einstein–Cartan theory

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213:). It is derived by rewriting the Einstein–Hilbert action in terms of the affine connection and then separately posing a constraint that forces both the torsion and contorsion to be zero, which thus forces the affine connection to be equal to the Levi-Civita connection. Because it is a direct translation of the action and field equations of general relativity, expressed in terms of the Levi-Civita connection, this may be regarded as the theory of general relativity, itself, transposed into the framework of Riemann–Cartan geometry. 4474: 33: 4018: 1451:, and vanishes outside of matter. Therefore, in principle the torsion can be algebraically eliminated from the theory in favor of the spin tensor, which generates an effective "spin–spin" nonlinear self-interaction inside matter. Torsion is equal to its source term and can be replaced by a boundary or a topological structure with a throat such as a "wormhole". 151:
by first reformulating general relativity onto a Riemann–Cartan geometry, replacing the Einstein–Hilbert action over Riemannian geometry by the Palatini action over Riemann–Cartan geometry; and second, removing the zero torsion constraint from the Palatini action, which results in the additional set
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A consequence of the linearity is that outside of matter there is zero torsion, so that the exterior geometry remains the same as what would be described in general relativity. The differences between Einstein–Cartan theory and general relativity (formulated either in terms of the Einstein–Hilbert
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Because Riemann–Cartan geometries have Lorentz symmetry as a local gauge symmetry, it is possible to formulate the associated conservation laws. In particular, regarding the metric and torsion tensors as independent variables gives the correct generalization of the conservation law for the total
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action on Riemannian geometry or the Palatini action on Riemann–Cartan geometry) rest solely on what happens to the geometry inside matter sources. That is: "torsion does not propagate". Generalizations of the Einstein–Cartan action have been considered which allow for propagating torsion.
224:(1) the field equations are now expressed in terms of affine connection, rather than the Levi-Civita connection, and so have additional terms in Einstein's field equations involving the contorsion that are not present in the field equations derived from the Palatini formulation; 1226: 1522:
in quantum field theory. According to general relativity, the gravitational collapse of a sufficiently compact mass forms a singular black hole. In the Einstein–Cartan theory, instead, the collapse reaches a bounce and forms a regular Einstein–Rosen bridge
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to be the true action of spacetime and then varying that action with respect to the metric tensor. The field equations of Einstein–Cartan theory come from exactly the same approach, except that a general asymmetric
307:"never understood what is so important physically about the possibility of torsion in differential geometry", other physicists claim that theories with torsion are valuable. The theory has indirectly influenced 294:
because torsion seemed to add little predictive benefit at the expense of the tractability of its equations. Since the Einstein–Cartan theory is purely classical, it also does not fully address the issue of
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Because the contorsion can be expressed linearly in terms of the torsion, then is also possible to directly translate the Einstein–Hilbert action into a Riemann–Cartan geometry, the result being the
1027:. The Ricci tensor is no longer symmetric because the connection contains a nonzero torsion tensor; therefore, the right-hand side of the equation cannot be symmetric either, implying that 1121: 415: 378: 4085: 245:). These extra equations express the torsion linearly in terms of the spin tensor associated with the matter source, which entails that the torsion generally be non-zero inside matter. 1506:
was contracting. This scenario also explains why the present Universe at largest scales appears spatially flat, homogeneous and isotropic, providing a physical alternative to cosmic
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in curved spacetime geometries. The result of adding this infrastructure is a Riemann–Cartan geometry. In particular, to be able to describe spinors requires the inclusion of a
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Cabral, F.; Lobo, F.S.N.; Rubiera-Garcia, D. (2020). "Cosmological bounces, cyclic universes, and effective cosmological constant in Einstein-Cartan-Dirac-Maxwell theory".
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Einstein–Cartan theory relaxes this condition and, correspondingly, relaxes general relativity's assumption that the affine connection have a vanishing antisymmetric part (
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represent the Lagrangian density of the gravitational field. The Lagrangian density for the gravitational field in the Einstein–Cartan theory is proportional to the
220:). The action used is the same as the Palatini action, except that the constraint on the torsion is removed. This results in two differences from general relativity: 1055: 1018: 984: 767: 4025: 3467: 1976:
Hehl, Friedrich W.; von der Heyde, Paul; Kerlick, G. David; Nester, James M. (1976-07-01). "General relativity with spin and torsion: Foundations and prospects".
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Hehl, Friedrich W.; von der Heyde, Paul; Kerlick, G. David (1974-08-15). "General relativity with spin and torsion and its deviations from Einstein's theory".
1486:) need not hold in Riemann–Cartan geometry. Consequently, Einstein–Cartan theory is able to avoid the general-relativistic problem of the singularity at the 3945: 3273: 4419: 1490:. The minimal coupling between torsion and Dirac spinors generates an effective nonlinear spin–spin self-interaction, which becomes significant inside 427: 3975: 3835: 1483: 4459: 3195: 167:. At the time of its original formulation, there was no concept of Riemann–Cartan geometry. Nor was there a sufficient awareness of the concept of 4348: 3771: 3444: 175:, such as would be required to be able to express continuity equations and conservation laws for rotational and boost symmetries, or to describe 3699: 4203: 3750: 3258: 3776: 3428: 3401: 3243: 3158: 3521: 3452: 3575: 4409: 4232: 4074: 3915: 3756: 3304: 3287: 3228: 1540: 108: 1531:; pair production by the gravitational field after the bounce, when torsion is still strong, generates a finite period of inflation. 56: 43: 4093: 3409: 3238: 75: 3970: 2766:
Kleinert, Hagen (2000). "Nonholonomic Mapping Principle for Classical and Quantum Mechanics in Spaces with Curvature and Torsion".
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of equations for spin and torsion, as well as the addition of extra spin-related terms in the Einstein field equations themselves.
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matter at extremely high densities. Such an interaction is conjectured to replace the singular Big Bang with a cusp-like
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N. Popławski (2023). "Chapter 13: Gravitational Collapse with Torsion and Universe in a Black Hole". In C. Bambi (ed.).
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Einstein–Cartan theory has been historically overshadowed by its torsion-free counterpart and other alternatives like
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Hehl, F. W.; Datta, B. K. (1971). "Nonlinear Spinor Equation and Asymmetric Connection in General Relativity".
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Ellis, George F. R.; Penrose, Sir Roger (2010). "Dennis William Sciama. 18 November 1926 — 19 December 1999".
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to understand that Riemannian geometries do not possess the requisite structure to embody a locally gauged
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Singularity theorems which are premised on and formulated within the setting of Riemannian geometry (e.g.
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The chief difference between a Riemann–Cartan geometry and Riemannian geometry is that in the former, the
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as part of a unified field theory. This line of thought led him to the related but different theory of
3205: 1383:{\displaystyle {T_{ab}}^{c}+{g_{a}}^{c}{T_{bd}}^{d}-{g_{b}}^{c}{T_{ad}}^{d}=\kappa {\sigma _{ab}}^{c}} 4318: 4267: 4260: 4213: 3885: 3858: 3735: 3654: 3633: 3626: 3501: 3356: 3314: 3101: 3056: 2988: 2933: 2878: 2830: 2785: 2738: 2693: 2648: 2603: 2539: 2478: 2429: 2374: 2327: 2155: 2083: 2036: 1985: 1934: 1891: 1836: 1643: 1598: 1555: 1550: 1468: 857:{\displaystyle {\frac {\delta {\mathcal {L}}_{\mathrm {G} }}{\delta g^{ab}}}-{\frac {1}{2}}P_{ab}=0} 1784:"Sur les variétés à connexion affine, et la théorie de la relativité généralisée (deuxième partie)" 1503: 1437: 156: 92: 1702:"Sur les variétés à connexion affine et la théorie de la relativité généralisée (première partie)" 1075: 634: 269:
became affiliated with the theory in 1928 during his unsuccessful attempt to match torsion to the
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Popławski, Nikodem J. (2012). "Nonsingular, big-bounce cosmology from spinor–torsion coupling".
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independently revisited the theory in the 1960s, and an important review was published in 1976.
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Hehl, F. W. (1974). "Spin and torsion in general relativity II: Geometry and field equations".
202:) is zero for Levi-Civita connections, as one of the defining conditions for such connections. 4372: 3781: 3689: 3433: 3361: 3117: 3072: 2949: 2894: 2846: 2801: 2754: 2709: 2664: 2619: 2410: 2355: 2308: 2269: 2171: 2052: 2001: 1950: 1907: 1864: 1805: 1764: 1723: 1659: 1616: 333: 195: 187: 614: 4330: 4312: 3990: 3763: 3457: 3351: 3109: 3064: 3033:
de Sabbata, V. and Sivaram, C. (1994). "Spin and Torsion in Gravitation" (World Scientific).
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Popławski, Nikodem J. (2010). "Cosmology with torsion: An alternative to cosmic inflation".
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K. Atazadeh (2014). "Stability of the Einstein static universe in Einstein-Cartan theory".
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de Sabbata, V. and Gasperini, M. (1985). "Introduction to Gravitation" (World Scientific).
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Petti, R J (2006-01-12). "Translational spacetime symmetries in gravitational theories".
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Kuchowicz, Bronisław (1978). "Friedmann-like cosmological models without singularity".
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Popławski, Nikodem J. (2010). "Nonsingular Dirac particles in spacetime with torsion".
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is independent of the metric, while in the latter it is derived from the metric as the
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Petti, R. J. (2021). "Derivation of Einstein–Cartan theory from general relativity".
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Trautman, Andrzej (1973). "Spin and Torsion May Avert Gravitational Singularities".
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Neville, Donald E. (15 February 1980). "Gravity theories with propagating torsion".
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Petti, R. J. (1976). "Some aspects of the geometry of first-quantized theories".
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Cabral, Francisco; Lobo, Francisco S. N.; Rubiera-Garcia, Diego (December 2019).
488:{\displaystyle {\mathcal {L}}_{\mathrm {G} }={\frac {1}{2\kappa }}R{\sqrt {|g|}}} 4449: 4133: 3955: 3526: 2292: 1515: 1058: 608: 242: 2552: 2515: 2386: 1057:
must include an asymmetric contribution that can be shown to be related to the
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Hehl, F. W. (1973). "Spin and torsion in general relativity: I. Foundations".
1997: 1903: 1495: 284: 198:. In particular, the antisymmetric part of the connection (referred to as the 3121: 3076: 2953: 2898: 2850: 2805: 2758: 2750: 2713: 2668: 2623: 2175: 2056: 2005: 1954: 1911: 1809: 1768: 1727: 1663: 1620: 155:
The theory of general relativity was originally formulated in the setting of
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Sciama, D. W. (1964-01-01). "The Physical Structure of General Relativity".
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Kibble, T. W. B. (1961). "Lorentz Invariance and the Gravitational Field".
1868: 3143: 3802: 3612: 3605: 1524: 1487: 1061:. This canonical energy–momentum tensor is related to the more familiar 132:(2) an additional set of equations are posed that relate torsion to spin. 1849: 142:
general relativity (Einstein–Hilbert) → general relativity (Palatini) →
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Lord, E. A. (1976). "Tensors, Relativity and Cosmology" (McGraw-Hill).
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Gronwald, F.; Hehl, F. W. (1996). "On the Gauge Aspects of Gravity".
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Regular Black Holes: Towards a New Paradigm of Gravitational Collapse
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Richard J. Petti (1986). "On the local geometry of rotating matter".
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Shapiro, I.L. (2002). "Physical aspects of the space–time torsion".
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Recently, interest in Einstein–Cartan theory has been driven toward
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Einstein–Cartan theory differs from general relativity in two ways:
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In Einstein–Cartan theory, the torsion is now a variable in the
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that is coupled to a curved spacetime formulation of spin (the
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International Journal of Geometric Methods in Modern Physics
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becomes nonlinear. Even though renowned physicists such as
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of general relativity can be derived by postulating the
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is the spin tensor. Because the torsion equation is an
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Poplawski, Nikodem J. (2009). "Spacetime and fields".
2516:"Big Bounce and closed universe from spin and torsion" 1527:) to a new, growing universe on the other side of the 4086:
Die Grundlagen der Einsteinschen Relativitäts-Theorie
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Trautman, Andrzej (2006). "Einstein–Cartan Theory".
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Hammond, Richard T (2002-03-27). "Torsion gravity".
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Biographical Memoirs of Fellows of the Royal Society
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Annales Scientifiques de l'École Normale Supérieure
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Annales Scientifiques de l'École Normale Supérieure
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Annales Scientifiques de l'École Normale Supérieure
1463:implications, most importantly, the avoidance of a 1683:Comptes rendus de l'Académie des Sciences de Paris 1428: 1382: 1220: 1103: 1049: 1012: 978: 941: 856: 761: 728: 696: 664: 623: 599: 576: 487: 409: 372: 265:in 1922 and expounded in the following few years. 4019:Investigations on the Theory of Brownian Movement 1467:at the beginning of the universe, such as in the 1072:The variation with respect to the torsion tensor 704:for the gravitational field and matter vanishes: 739:The variation with respect to the metric tensor 4026:Relativity: The Special and the General Theory 3468:Degenerate Higher-Order Scalar-Tensor theories 2232:Journal of Cosmology and Astroparticle Physics 3829: 3159: 410:{\displaystyle {\mathcal {L}}_{\mathrm {G} }} 373:{\displaystyle {\mathcal {L}}_{\mathrm {M} }} 183:, which suffices to produce such a geometry. 60:that contextualizes different points of view. 46:to certain ideas, incidents, or controversies 8: 1447:, the torsion field does not propagate as a 3836: 3822: 3814: 3294: 3185: 3166: 3152: 3144: 1825:"On the History of Unified Field Theories" 3134: 3050: 3021: 2982: 2927: 2779: 2584: 2551: 2533: 2490: 2472: 2423: 2368: 2321: 2282: 2243: 2206: 2095: 1858: 1848: 1799: 1758: 1717: 1610: 1592: 1420: 1410: 1405: 1402: 1374: 1364: 1359: 1346: 1336: 1331: 1324: 1317: 1312: 1302: 1292: 1287: 1280: 1273: 1268: 1258: 1248: 1243: 1240: 1206: 1196: 1191: 1180: 1168: 1158: 1153: 1140: 1139: 1133: 1132: 1125: 1123: 1095: 1085: 1080: 1077: 1038: 1032: 1001: 995: 967: 961: 930: 911: 894: 882: 876: 839: 825: 810: 794: 793: 787: 786: 779: 777: 750: 744: 712: 689: 656: 647: 636: 616: 592: 562: 557: 545: 544: 538: 537: 526: 525: 519: 518: 501: 478: 470: 468: 450: 440: 439: 433: 432: 429: 400: 399: 393: 392: 389: 363: 362: 356: 355: 352: 76:Learn how and when to remove this message 4460:Emergency Committee of Atomic Scientists 1232: 868: 3772:Gravitational interaction of antimatter 1567: 4204:Albert Einstein World Award of Science 299:. In the Einstein–Cartan theory, the 3777:Physics in the medieval Islamic world 3700:(2+1)-dimensional topological gravity 3196:Newton's law of universal gravitation 336:is assumed rather than the symmetric 136:This difference can be factored into 7: 3522:Asymptotic safety in quantum gravity 1484:Penrose–Hawking singularity theorems 684:, the variation of the total action 101:Einstein–Cartan–Sciama–Kibble theory 311:(and seems also to have influenced 111:. The theory was first proposed by 4233:Albert Einstein: Creator and Rebel 3946:Einstein–Infeld–Hoffmann equations 3916:Einstein relation (kinetic theory) 3274:Gibbons–Hawking–York boundary term 2871:General Relativity and Gravitation 2823:General Relativity and Gravitation 2768:General Relativity and Gravitation 2686:General Relativity and Gravitation 2641:General Relativity and Gravitation 2148:General Relativity and Gravitation 1541:Alternatives to general relativity 1429:{\displaystyle {\sigma _{ab}}^{c}} 1141: 795: 546: 527: 441: 401: 364: 109:alternatives to general relativity 25: 4094:The Einstein Theory of Relativity 3389:Modified Newtonian dynamics, MOND 3305:Classical theories of gravitation 2514:Unger, G.; Popławski, N. (2019). 261:The theory was first proposed by 4473: 4472: 4209:Einstein Prize for Laser Science 1546:Metric-affine gravitation theory 31: 4254:Einstein: His Life and Universe 3211:History of gravitational theory 2029:Journal of Mathematical Physics 1927:Journal of Mathematical Physics 1581:The European Physical Journal C 769:yields the Einstein equations: 105:classical theory of gravitation 88:Classical theory of gravitation 3876:Mass–energy equivalence (E=mc) 3517:Causal dynamical triangulation 3206:Poisson's equation for gravity 2596:Reports on Progress in Physics 2442:10.1016/j.physletb.2010.04.073 2340:10.1016/j.physletb.2010.09.056 2201:. Springer. pp. 485–499. 1823:Goenner, Hubert F. M. (2004). 1612:10.1140/epjc/s10052-019-7536-3 1067:Belinfante–Rosenfeld procedure 1065:energy–momentum tensor by the 479: 471: 239:principle of stationary action 1: 3069:10.1016/s0370-1573(01)00030-8 2916:Classical and Quantum Gravity 2254:10.1088/1475-7516/2014/06/020 1445:partial differential equation 1025:stress–energy–momentum tensor 2217:10.1007/978-981-99-1596-5_13 2072:"Note on the torsion tensor" 1829:Living Reviews in Relativity 1104:{\displaystyle {T^{ab}}_{c}} 665:{\displaystyle 8\pi G/c^{4}} 271:electromagnetic field tensor 4199:Albert Einstein Peace Prize 3976:Unsuccessful investigations 3379:Infinite derivative gravity 2293:10.1103/PhysRevD.102.083509 2070:Hehl, Friedrich W. (2007). 729:{\displaystyle \delta S=0.} 4522: 4126:Picasso at the Lapin Agile 4064:Russell–Einstein Manifesto 3936:Bose–Einstein correlations 3567:Unified-field-theoric and 2946:10.1088/0264-9381/23/3/012 2616:10.1088/0034-4885/65/5/201 2492:10.3847/0004-637X/832/2/96 2387:10.1103/PhysRevD.85.107502 1455:Avoidance of singularities 611:of the metric tensor, and 4468: 4034:The Meaning of Relativity 3710:Jackiw–Teitelboim gravity 3489:Canonical quantum gravity 3484:Euclidean quantum gravity 3001:10.1142/S0219887821500833 1998:10.1103/revmodphys.48.393 1978:Reviews of Modern Physics 1904:10.1103/revmodphys.36.463 1884:Reviews of Modern Physics 1465:gravitational singularity 163:, out of which arise the 4425:Albert Einstein Archives 4355:Bernhard Caesar Einstein 4102:Relics: Einstein's Brain 4050:The Evolution of Physics 3931:Bose–Einstein statistics 3926:Bose–Einstein condensate 3906:Einstein field equations 3586:Superfluid vacuum theory 3410:Nonsymmetric gravitation 3259:Post-Newtonian formalism 2751:10.1103/physrevd.10.1066 2553:10.3847/1538-4357/aaf169 1498:at a minimum but finite 325:Einstein field equations 165:Einstein field equations 4435:Einstein Papers Project 3951:Einstein–de Haas effect 3751:Mechanical explanations 3620:Heterotic string theory 3576:Noncommutative geometry 3495:Wheeler–DeWitt equation 3221:General relativity (GR) 3201:Gauss's law for gravity 3175:Theories of gravitation 3094:Nature Physical Science 2798:10.1023/a:1001962922592 1656:10.1103/physrevd.21.867 631:is a physical constant 624:{\displaystyle \kappa } 329:Einstein–Hilbert action 161:Einstein–Hilbert action 18:Einstein-Cartan gravity 4367:Thomas Martin Einstein 4275:Introducing Relativity 4247:Einstein for Beginners 4150:Einstein and Eddington 3941:Einstein–Cartan theory 3592:Logarithmic BEC vacuum 3537:Rainbow gravity theory 3415:Scalar–tensor theories 3189:Newtonian gravity (NG) 3114:10.1038/physci242007a0 2977:(6): 2150083–2151205. 2455:Popławski, N. (2016). 2125:10.1098/rsbm.2009.0023 1520:ultraviolet divergence 1430: 1384: 1222: 1105: 1051: 1050:{\displaystyle P_{ab}} 1014: 1013:{\displaystyle P_{ab}} 980: 979:{\displaystyle R_{ab}} 943: 858: 763: 762:{\displaystyle g^{ab}} 730: 698: 674:gravitational constant 666: 625: 601: 578: 489: 411: 374: 338:Levi-Civita connection 192:Levi-Civita connection 97:Einstein–Cartan theory 4440:Einstein refrigerator 4430:Einstein's Blackboard 4309:(second wife; cousin) 4240:Einstein and Religion 4189:Albert Einstein Medal 4184:Albert Einstein Award 4042:The World as I See It 3981:Wave–particle duality 3961:Bohr–Einstein debates 3921:Cosmological constant 3901:Equivalence principle 3891:Einstein coefficients 3669:Twistor string theory 3648:Type II string theory 3641:Bosonic string theory 3581:Semiclassical gravity 3546:Unified-field-theoric 3331:Poincaré gauge theory 2521:Astrophysical Journal 2461:Astrophysical Journal 1782:Cartan, Elie (1925). 1741:Cartan, Elie (1924). 1700:Cartan, Elie (1923). 1431: 1385: 1223: 1106: 1052: 1015: 981: 944: 859: 764: 731: 699: 667: 626: 602: 579: 490: 412: 375: 54:by rewriting it in a 4319:Hans Albert Einstein 4268:I Am Albert Einstein 4214:Einstein Prize (APS) 3886:Photoelectric effect 3859:Theory of relativity 3736:Aristotelian physics 3705:Gauss–Bonnet gravity 3655:Little string theory 3634:Type 0 string theory 3627:Type I string theory 3502:Loop quantum gravity 3429:Scalar–tensor–vector 3402:Tensor–vector–scalar 3357:Gauge theory gravity 3315:Theory of everything 1677:Élie Cartan (1922). 1556:Loop quantum gravity 1551:Gauge theory gravity 1469:black hole cosmology 1401: 1239: 1122: 1076: 1031: 994: 960: 875: 776: 743: 711: 688: 682:Hamilton's principle 635: 615: 591: 500: 428: 388: 351: 309:loop quantum gravity 99:, also known as the 4501:Theories of gravity 3971:Thought experiments 3553:Kaluza–Klein theory 3106:1973NPhS..242....7T 3061:2002PhR...357..113S 2993:2021IJGMM..1850083P 2938:2006CQGra..23..737P 2883:1976GReGr...7..869P 2835:1978GReGr...9..511K 2790:2000GReGr..32..769K 2743:1974PhRvD..10.1066H 2698:1974GReGr...5..491H 2653:1973GReGr...4..333H 2608:2002RPPh...65..599H 2544:2019ApJ...870...78U 2483:2016ApJ...832...96P 2434:2010PhLB..690...73P 2379:2012PhRvD..85j7502P 2332:2010PhLB..694..181P 2160:1986GReGr..18..441P 2088:2007PhT....60c..16H 2041:1971JMP....12.1334H 1990:1976RvMP...48..393H 1939:1961JMP.....2..212K 1896:1964RvMP...36..463S 1850:10.12942/lrr-2004-2 1841:2004LRR.....7....2G 1648:1980PhRvD..21..867N 1603:2019EPJC...79.1023C 1504:observable universe 1502:, before which the 157:Riemannian geometry 93:theoretical physics 4420:Things named after 4282:Subtle is the Lord 4105:(1994 documentary) 4097:(1923 documentary) 4089:(1922 documentary) 3986:Gravitational wave 3869:General relativity 3864:Special relativity 3798:Gravitational wave 3681:Generalisations / 3569:quantum-mechanical 3477:Quantum-mechanical 3290:general relativity 3264:Linearized gravity 2891:10.1007/bf00771019 2843:10.1007/bf00759545 2706:10.1007/bf02451393 2661:10.1007/bf00759853 2168:10.1007/bf00770462 1801:10.24033/asens.761 1760:10.24033/asens.753 1719:10.24033/asens.751 1426: 1380: 1218: 1111:yields the Cartan 1101: 1047: 1010: 976: 939: 854: 759: 726: 694: 662: 621: 597: 574: 485: 407: 382:Lagrangian density 370: 292:Brans–Dicke theory 211:Palatini variation 4488: 4487: 4390:Awards and honors 4373:Siegbert Einstein 4261:Einstein's Cosmos 3811: 3810: 3782:Theory of impetus 3718: 3717: 3690:Liouville gravity 3434:Conformal gravity 3362:Composite gravity 3352:Bimetric theories 3282: 3281: 2731:Physical Review D 2411:Physics Letters B 2356:Physical Review D 2309:Physics Letters B 2270:Physical Review D 2097:10.1063/1.2718743 2049:10.1063/1.1665738 1947:10.1063/1.1703702 1636:Physical Review D 1393: 1392: 1188: 1175: 952: 951: 902: 833: 820: 697:{\displaystyle S} 600:{\displaystyle g} 483: 463: 334:affine connection 188:affine connection 107:, one of several 86: 85: 78: 40:This article may 16:(Redirected from 4513: 4476: 4475: 4375:(distant cousin) 4369:(great-grandson) 4331:Hermann Einstein 4313:Lieserl Einstein 3991:Tea leaf paradox 3838: 3831: 3824: 3815: 3766: 3764:Entropic gravity 3759: 3683:extensions of GR 3671: 3657: 3650: 3643: 3636: 3629: 3622: 3615: 3608: 3594: 3511: 3504: 3497: 3458:Geometrodynamics 3447: 3423: 3404: 3397: 3346: 3339: 3295: 3186: 3168: 3161: 3154: 3145: 3140: 3138: 3125: 3088: 3054: 3027: 3025: 3012: 2986: 2965: 2931: 2910: 2862: 2817: 2783: 2762: 2737:(4): 1066–1069. 2725: 2680: 2635: 2590: 2588: 2566: 2565: 2555: 2537: 2511: 2505: 2504: 2494: 2476: 2452: 2446: 2445: 2427: 2405: 2399: 2398: 2372: 2350: 2344: 2343: 2325: 2303: 2297: 2296: 2286: 2264: 2258: 2257: 2247: 2227: 2221: 2220: 2210: 2194: 2188: 2187: 2143: 2137: 2136: 2108: 2102: 2101: 2099: 2067: 2061: 2060: 2035:(7): 1334–1339. 2024: 2018: 2017: 1973: 1967: 1966: 1922: 1916: 1915: 1879: 1873: 1872: 1862: 1852: 1820: 1814: 1813: 1803: 1779: 1773: 1772: 1762: 1738: 1732: 1731: 1721: 1697: 1691: 1690: 1674: 1668: 1667: 1631: 1625: 1624: 1614: 1596: 1572: 1518:and removes the 1435: 1433: 1432: 1427: 1425: 1424: 1419: 1418: 1417: 1389: 1387: 1386: 1381: 1379: 1378: 1373: 1372: 1371: 1351: 1350: 1345: 1344: 1343: 1329: 1328: 1323: 1322: 1321: 1307: 1306: 1301: 1300: 1299: 1285: 1284: 1279: 1278: 1277: 1263: 1262: 1257: 1256: 1255: 1233: 1227: 1225: 1224: 1219: 1211: 1210: 1205: 1204: 1203: 1189: 1181: 1176: 1174: 1173: 1172: 1167: 1166: 1165: 1147: 1146: 1145: 1144: 1138: 1137: 1126: 1110: 1108: 1107: 1102: 1100: 1099: 1094: 1093: 1092: 1056: 1054: 1053: 1048: 1046: 1045: 1019: 1017: 1016: 1011: 1009: 1008: 985: 983: 982: 977: 975: 974: 948: 946: 945: 940: 938: 937: 919: 918: 903: 895: 890: 889: 869: 863: 861: 860: 855: 847: 846: 834: 826: 821: 819: 818: 817: 801: 800: 799: 798: 792: 791: 780: 768: 766: 765: 760: 758: 757: 735: 733: 732: 727: 703: 701: 700: 695: 671: 669: 668: 663: 661: 660: 651: 630: 628: 627: 622: 606: 604: 603: 598: 583: 581: 580: 575: 567: 566: 556: 552: 551: 550: 549: 543: 542: 532: 531: 530: 524: 523: 494: 492: 491: 486: 484: 482: 474: 469: 464: 462: 451: 446: 445: 444: 438: 437: 416: 414: 413: 408: 406: 405: 404: 398: 397: 379: 377: 376: 371: 369: 368: 367: 361: 360: 173:Lorentz symmetry 81: 74: 70: 67: 61: 57:balanced fashion 35: 34: 27: 21: 4521: 4520: 4516: 4515: 4514: 4512: 4511: 4510: 4506:Albert Einstein 4491: 4490: 4489: 4484: 4464: 4415:Religious views 4410:Political views 4378: 4363:(granddaughter) 4361:Evelyn Einstein 4349:Robert Einstein 4343:Eduard Einstein 4287: 4224: 4218: 4172: 4142:Einstein's Gift 4076: 4069: 4010:Annus mirabilis 3995: 3966:Teleparallelism 3911:Einstein radius 3881:Brownian motion 3847: 3845:Albert Einstein 3842: 3812: 3807: 3786: 3762: 3755: 3726: 3724: 3714: 3695:Lovelock theory 3682: 3676: 3667: 3653: 3646: 3639: 3632: 3625: 3618: 3611: 3604: 3590: 3568: 3562: 3541: 3507: 3500: 3493: 3472: 3463:Induced gravity 3443: 3439:Scalar theories 3419: 3400: 3393: 3384:Massive gravity 3344:Teleparallelism 3342: 3337:Einstein–Cartan 3335: 3319: 3310:Quantum gravity 3289: 3288:Alternatives to 3278: 3244:Exact solutions 3215: 3177: 3172: 3128: 3091: 3039:Physics Reports 3036: 3015: 2968: 2913: 2877:(11): 869–883. 2868: 2820: 2765: 2728: 2683: 2638: 2593: 2578: 2575: 2573:Further reading 2570: 2569: 2513: 2512: 2508: 2454: 2453: 2449: 2407: 2406: 2402: 2352: 2351: 2347: 2305: 2304: 2300: 2266: 2265: 2261: 2229: 2228: 2224: 2196: 2195: 2191: 2145: 2144: 2140: 2110: 2109: 2105: 2069: 2068: 2064: 2026: 2025: 2021: 1975: 1974: 1970: 1924: 1923: 1919: 1881: 1880: 1876: 1822: 1821: 1817: 1781: 1780: 1776: 1740: 1739: 1735: 1699: 1698: 1694: 1676: 1675: 1671: 1633: 1632: 1628: 1574: 1573: 1569: 1564: 1537: 1473:static universe 1457: 1406: 1404: 1399: 1398: 1360: 1358: 1332: 1330: 1313: 1311: 1288: 1286: 1269: 1267: 1244: 1242: 1237: 1236: 1192: 1190: 1154: 1152: 1148: 1131: 1127: 1120: 1119: 1113:spin connection 1081: 1079: 1074: 1073: 1034: 1029: 1028: 997: 992: 991: 963: 958: 957: 926: 907: 878: 873: 872: 835: 806: 802: 785: 781: 774: 773: 746: 741: 740: 709: 708: 686: 685: 652: 633: 632: 613: 612: 589: 588: 558: 536: 517: 516: 512: 498: 497: 455: 431: 426: 425: 391: 386: 385: 354: 349: 348: 321: 319:Field equations 305:Steven Weinberg 297:quantum gravity 275:teleparallelism 267:Albert Einstein 259: 207:Palatini action 144:Einstein–Cartan 121: 89: 82: 71: 65: 62: 52:help improve it 49: 36: 32: 23: 22: 15: 12: 11: 5: 4519: 4517: 4509: 4508: 4503: 4493: 4492: 4486: 4485: 4483: 4482: 4469: 4466: 4465: 4463: 4462: 4457: 4452: 4447: 4442: 4437: 4432: 4427: 4422: 4417: 4412: 4407: 4402: 4397: 4392: 4386: 4384: 4380: 4379: 4377: 4376: 4370: 4364: 4358: 4352: 4346: 4340: 4334: 4328: 4322: 4316: 4310: 4304: 4297: 4295: 4289: 4288: 4286: 4285: 4278: 4271: 4264: 4257: 4250: 4243: 4236: 4228: 4226: 4220: 4219: 4217: 4216: 4211: 4206: 4201: 4196: 4191: 4186: 4180: 4178: 4174: 4173: 4171: 4170: 4162: 4154: 4153:(2008 TV film) 4146: 4138: 4130: 4122: 4118:Young Einstein 4114: 4110:Insignificance 4106: 4098: 4090: 4081: 4079: 4071: 4070: 4068: 4067: 4061: 4058:Why Socialism? 4054: 4046: 4038: 4030: 4022: 4015: 4005: 4003: 3997: 3996: 3994: 3993: 3988: 3983: 3978: 3973: 3968: 3963: 3958: 3953: 3948: 3943: 3938: 3933: 3928: 3923: 3918: 3913: 3908: 3903: 3898: 3896:Einstein solid 3893: 3888: 3883: 3878: 3873: 3872: 3871: 3866: 3855: 3853: 3849: 3848: 3843: 3841: 3840: 3833: 3826: 3818: 3809: 3808: 3806: 3805: 3800: 3794: 3792: 3791:Related topics 3788: 3787: 3785: 3784: 3779: 3774: 3769: 3768: 3767: 3760: 3748: 3743: 3738: 3732: 3730: 3720: 3719: 3716: 3715: 3713: 3712: 3707: 3702: 3697: 3692: 3686: 3684: 3678: 3677: 3675: 3674: 3673: 3672: 3663:Twistor theory 3660: 3659: 3658: 3651: 3644: 3637: 3630: 3623: 3616: 3609: 3597: 3596: 3595: 3583: 3578: 3572: 3570: 3564: 3563: 3561: 3560: 3555: 3549: 3547: 3543: 3542: 3540: 3539: 3534: 3529: 3524: 3519: 3514: 3513: 3512: 3505: 3498: 3486: 3480: 3478: 3474: 3473: 3471: 3470: 3465: 3460: 3455: 3450: 3449: 3448: 3436: 3431: 3426: 3425: 3424: 3412: 3407: 3406: 3405: 3398: 3386: 3381: 3376: 3364: 3359: 3354: 3349: 3348: 3347: 3340: 3327: 3325: 3321: 3320: 3318: 3317: 3312: 3307: 3301: 3299: 3292: 3284: 3283: 3280: 3279: 3277: 3276: 3271: 3266: 3261: 3256: 3251: 3246: 3241: 3236: 3231: 3225: 3223: 3217: 3216: 3214: 3213: 3208: 3203: 3198: 3192: 3190: 3183: 3179: 3178: 3173: 3171: 3170: 3163: 3156: 3148: 3142: 3141: 3126: 3089: 3052:hep-th/0103093 3045:(2): 113–213. 3034: 3031: 3028: 3013: 2966: 2922:(3): 737–751. 2911: 2866: 2863: 2829:(6): 511–517. 2818: 2774:(5): 769–839. 2763: 2726: 2692:(5): 491–516. 2681: 2647:(4): 333–349. 2636: 2602:(5): 599–649. 2591: 2574: 2571: 2568: 2567: 2506: 2447: 2400: 2363:(10): 107502. 2345: 2316:(3): 181–185. 2298: 2259: 2222: 2189: 2154:(5): 441–460. 2138: 2103: 2062: 2019: 1984:(3): 393–416. 1968: 1933:(2): 212–221. 1917: 1890:(1): 463–469. 1874: 1815: 1774: 1733: 1692: 1669: 1642:(4): 867–873. 1626: 1566: 1565: 1563: 1560: 1559: 1558: 1553: 1548: 1543: 1536: 1533: 1456: 1453: 1443:rather than a 1423: 1416: 1413: 1409: 1395: 1394: 1391: 1390: 1377: 1370: 1367: 1363: 1357: 1354: 1349: 1342: 1339: 1335: 1327: 1320: 1316: 1310: 1305: 1298: 1295: 1291: 1283: 1276: 1272: 1266: 1261: 1254: 1251: 1247: 1229: 1228: 1217: 1214: 1209: 1202: 1199: 1195: 1187: 1184: 1179: 1171: 1164: 1161: 1157: 1151: 1143: 1136: 1130: 1098: 1091: 1088: 1084: 1044: 1041: 1037: 1007: 1004: 1000: 973: 970: 966: 954: 953: 950: 949: 936: 933: 929: 925: 922: 917: 914: 910: 906: 901: 898: 893: 888: 885: 881: 865: 864: 853: 850: 845: 842: 838: 832: 829: 824: 816: 813: 809: 805: 797: 790: 784: 756: 753: 749: 737: 736: 725: 722: 719: 716: 693: 678:speed of light 672:involving the 659: 655: 650: 646: 643: 640: 620: 596: 585: 584: 573: 570: 565: 561: 555: 548: 541: 535: 529: 522: 515: 511: 508: 505: 495: 481: 477: 473: 467: 461: 458: 454: 449: 443: 436: 403: 396: 384:of matter and 380:represent the 366: 359: 320: 317: 313:twistor theory 301:Dirac equation 258: 255: 235: 234: 226: 225: 218:torsion tensor 181:spin structure 169:gauge symmetry 149: 148: 147: 146: 134: 133: 129: 128: 120: 117: 87: 84: 83: 39: 37: 30: 24: 14: 13: 10: 9: 6: 4: 3: 2: 4518: 4507: 4504: 4502: 4499: 4498: 4496: 4481: 4480: 4471: 4470: 4467: 4461: 4458: 4456: 4453: 4451: 4448: 4446: 4443: 4441: 4438: 4436: 4433: 4431: 4428: 4426: 4423: 4421: 4418: 4416: 4413: 4411: 4408: 4406: 4403: 4401: 4398: 4396: 4393: 4391: 4388: 4387: 4385: 4381: 4374: 4371: 4368: 4365: 4362: 4359: 4356: 4353: 4350: 4347: 4344: 4341: 4338: 4337:Maja Einstein 4335: 4332: 4329: 4326: 4323: 4320: 4317: 4314: 4311: 4308: 4307:Elsa Einstein 4305: 4302: 4299: 4298: 4296: 4294: 4290: 4284: 4283: 4279: 4277: 4276: 4272: 4270: 4269: 4265: 4263: 4262: 4258: 4256: 4255: 4251: 4249: 4248: 4244: 4242: 4241: 4237: 4235: 4234: 4230: 4229: 4227: 4221: 4215: 4212: 4210: 4207: 4205: 4202: 4200: 4197: 4195: 4194:Kalinga Prize 4192: 4190: 4187: 4185: 4182: 4181: 4179: 4175: 4168: 4167: 4163: 4161:(2017 series) 4160: 4159: 4155: 4152: 4151: 4147: 4144: 4143: 4139: 4136: 4135: 4131: 4128: 4127: 4123: 4120: 4119: 4115: 4112: 4111: 4107: 4104: 4103: 4099: 4096: 4095: 4091: 4088: 4087: 4083: 4082: 4080: 4078: 4072: 4065: 4062: 4059: 4055: 4052: 4051: 4047: 4044: 4043: 4039: 4036: 4035: 4031: 4028: 4027: 4023: 4020: 4016: 4013: 4011: 4007: 4006: 4004: 4002: 3998: 3992: 3989: 3987: 3984: 3982: 3979: 3977: 3974: 3972: 3969: 3967: 3964: 3962: 3959: 3957: 3954: 3952: 3949: 3947: 3944: 3942: 3939: 3937: 3934: 3932: 3929: 3927: 3924: 3922: 3919: 3917: 3914: 3912: 3909: 3907: 3904: 3902: 3899: 3897: 3894: 3892: 3889: 3887: 3884: 3882: 3879: 3877: 3874: 3870: 3867: 3865: 3862: 3861: 3860: 3857: 3856: 3854: 3850: 3846: 3839: 3834: 3832: 3827: 3825: 3820: 3819: 3816: 3804: 3801: 3799: 3796: 3795: 3793: 3789: 3783: 3780: 3778: 3775: 3773: 3770: 3765: 3761: 3758: 3757:Fatio–Le Sage 3754: 3753: 3752: 3749: 3747: 3744: 3742: 3739: 3737: 3734: 3733: 3731: 3729: 3723:Pre-Newtonian 3721: 3711: 3708: 3706: 3703: 3701: 3698: 3696: 3693: 3691: 3688: 3687: 3685: 3679: 3670: 3666: 3665: 3664: 3661: 3656: 3652: 3649: 3645: 3642: 3638: 3635: 3631: 3628: 3624: 3621: 3617: 3614: 3610: 3607: 3603: 3602: 3601: 3600:String theory 3598: 3593: 3589: 3588: 3587: 3584: 3582: 3579: 3577: 3574: 3573: 3571: 3565: 3559: 3556: 3554: 3551: 3550: 3548: 3544: 3538: 3535: 3533: 3530: 3528: 3525: 3523: 3520: 3518: 3515: 3510: 3506: 3503: 3499: 3496: 3492: 3491: 3490: 3487: 3485: 3482: 3481: 3479: 3475: 3469: 3466: 3464: 3461: 3459: 3456: 3454: 3451: 3446: 3442: 3441: 3440: 3437: 3435: 3432: 3430: 3427: 3422: 3418: 3417: 3416: 3413: 3411: 3408: 3403: 3399: 3396: 3392: 3391: 3390: 3387: 3385: 3382: 3380: 3377: 3375: 3373: 3369: 3365: 3363: 3360: 3358: 3355: 3353: 3350: 3345: 3341: 3338: 3334: 3333: 3332: 3329: 3328: 3326: 3322: 3316: 3313: 3311: 3308: 3306: 3303: 3302: 3300: 3296: 3293: 3291: 3285: 3275: 3272: 3270: 3269:ADM formalism 3267: 3265: 3262: 3260: 3257: 3255: 3252: 3250: 3247: 3245: 3242: 3240: 3237: 3235: 3232: 3230: 3227: 3226: 3224: 3222: 3218: 3212: 3209: 3207: 3204: 3202: 3199: 3197: 3194: 3193: 3191: 3187: 3184: 3180: 3176: 3169: 3164: 3162: 3157: 3155: 3150: 3149: 3146: 3137: 3136:gr-qc/0606062 3132: 3127: 3123: 3119: 3115: 3111: 3107: 3103: 3099: 3095: 3090: 3086: 3082: 3078: 3074: 3070: 3066: 3062: 3058: 3053: 3048: 3044: 3040: 3035: 3032: 3029: 3024: 3019: 3014: 3010: 3006: 3002: 2998: 2994: 2990: 2985: 2980: 2976: 2972: 2967: 2963: 2959: 2955: 2951: 2947: 2943: 2939: 2935: 2930: 2925: 2921: 2917: 2912: 2908: 2904: 2900: 2896: 2892: 2888: 2884: 2880: 2876: 2872: 2867: 2864: 2860: 2856: 2852: 2848: 2844: 2840: 2836: 2832: 2828: 2824: 2819: 2815: 2811: 2807: 2803: 2799: 2795: 2791: 2787: 2782: 2781:gr-qc/9801003 2777: 2773: 2769: 2764: 2760: 2756: 2752: 2748: 2744: 2740: 2736: 2732: 2727: 2723: 2719: 2715: 2711: 2707: 2703: 2699: 2695: 2691: 2687: 2682: 2678: 2674: 2670: 2666: 2662: 2658: 2654: 2650: 2646: 2642: 2637: 2633: 2629: 2625: 2621: 2617: 2613: 2609: 2605: 2601: 2597: 2592: 2587: 2586:gr-qc/9602013 2582: 2577: 2576: 2572: 2563: 2559: 2554: 2549: 2545: 2541: 2536: 2531: 2527: 2523: 2522: 2517: 2510: 2507: 2502: 2498: 2493: 2488: 2484: 2480: 2475: 2470: 2466: 2462: 2458: 2451: 2448: 2443: 2439: 2435: 2431: 2426: 2421: 2417: 2413: 2412: 2404: 2401: 2396: 2392: 2388: 2384: 2380: 2376: 2371: 2366: 2362: 2358: 2357: 2349: 2346: 2341: 2337: 2333: 2329: 2324: 2319: 2315: 2311: 2310: 2302: 2299: 2294: 2290: 2285: 2280: 2277:(8): 083509. 2276: 2272: 2271: 2263: 2260: 2255: 2251: 2246: 2241: 2237: 2233: 2226: 2223: 2218: 2214: 2209: 2204: 2200: 2193: 2190: 2185: 2181: 2177: 2173: 2169: 2165: 2161: 2157: 2153: 2149: 2142: 2139: 2134: 2130: 2126: 2122: 2118: 2114: 2107: 2104: 2098: 2093: 2089: 2085: 2081: 2077: 2076:Physics Today 2073: 2066: 2063: 2058: 2054: 2050: 2046: 2042: 2038: 2034: 2030: 2023: 2020: 2015: 2011: 2007: 2003: 1999: 1995: 1991: 1987: 1983: 1979: 1972: 1969: 1964: 1960: 1956: 1952: 1948: 1944: 1940: 1936: 1932: 1928: 1921: 1918: 1913: 1909: 1905: 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Index

Einstein-Cartan gravity
undue weight
help improve it
balanced fashion
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theoretical physics
classical theory of gravitation
alternatives to general relativity
Élie Cartan
Riemannian geometry
Einstein–Hilbert action
Einstein field equations
gauge symmetry
Lorentz symmetry
spinors
spin structure
affine connection
Levi-Civita connection
contorsion
torsion
Palatini action
Palatini variation
torsion tensor
spin
principle of stationary action
spin tensor
Élie Cartan
Albert Einstein
electromagnetic field tensor
teleparallelism

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