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Virtual fundamental class

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22: 1504:, but the first definitions are more amenable for constructing lower-brow examples for certain kinds of schemes, such as ones with components of varying dimension. In this way, the structure of the virtual fundamental classes becomes more transparent, giving more intuition for their behavior and structure. 2589:
The first map in the definition of the Gysin morphism corresponds to specializing to the normal cone, which is essentially the first part of the standard Gysin morphism, as defined in Fulton. But, because we are not working with smooth varieties, Fulton's cone construction doesn't work, since it
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We can understand the motivation for the definition of the virtual fundamental class by considering what situation should be emulated for a simple case (such as a smooth complete intersection). Suppose we have a variety
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which has better behavior with respect to the enumerative problems being considered. In this way, there exists a cycle with can be used for answering specific enumerative problems, such as the number of degree
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for which there is an embedding, we must rely upon deformation theory techniques to construct this cycle on the moduli space representing the fundamental class. Now in the case where we have the section
2556: 336: 2424: 1482: 2646:, hence the normal bundle could act as the obstruction bundle. In this way, the intermediate step of using the specialization of the normal cone only keeps the intersection-theoretic data of 172: 589: 594:
whose components consist of one degree 3 curve which contracts to a point. There is a virtual fundamental class which can then be used to count the number of curves in this family.
2644: 1927: 1584: 1888: 1641: 1434: 894: 545: 2329: 2193: 645: 240: 1377: 417:, their behavior can be wild at the boundary, such as having higher-dimensional components at the boundary than on the main space. One such example is in the moduli space 2279: 931: 1119: 415: 2213: 1714: 1679: 1026: 731: 379: 1484:
act as the tangent and obstruction sheaves. Note the construction of Behrend-Fantechi is a dualization of the exact sequence given from the concrete example above.
783: 3027: 2998:. John, March 21- Morgan, Dusa McDuff, Mohammad Tehrani, Kenji Fukaya, Dominic D. Joyce, Simons Center for Geometry and Physics. Providence, Rhode Island. 2019. 2684: 2664: 2579: 2448: 1947: 1734: 1550: 1530: 1139: 1086: 1066: 1046: 991: 971: 951: 863: 843: 823: 803: 751: 705: 685: 665: 621: 516: 359: 265: 192: 1253: 1147: 39: 1742: 3080: 3003: 423: 2138:{\displaystyle A_{*}(Y)\xrightarrow {\sigma } A_{*}(C_{X/Y})\xrightarrow {i_{*}} A_{*}(E_{X/Y})\xrightarrow {0_{E_{X/Y}}^{!}} A_{*-r}(X)} 86: 58: 2948: 2862: 2745: 105: 65: 2460: 1512:
One of the first definitions of a virtual fundamental class is for the following case: suppose we have an embedding of a scheme
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There are multiple definitions of virtual fundamental classes, all of which are subsumed by the definition for morphisms of
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Thomas, R. P. (2001-06-11). "A holomorphic Casson invariant for Calabi-Yau 3-folds, and bundles on K3 fibrations".
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Siebert, Bernd (2005-09-04). "Virtual fundamental classes, global normal cones and Fulton's canonical classes".
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Li, Jun; Tian, Gang (1998-02-13). "Virtual moduli cycles and Gromov-Witten invariants of algebraic varieties".
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where the last term represents the "obstruction sheaf". For the general case there is an exact sequence
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Now, this situation dealt with in Fulton-MacPherson intersection theory by looking at the induced cone
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Kontsevich, M. (1995-06-27). "Enumeration of rational curves via torus actions".
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in the map since it corresponds to the zero section of vector bundle. Then, the
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Virtual fundamental classes, global normal cones and Fulton's canonical classes
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Pandharipande, R.; Thomas, R. P. (2014). "13/2 ways of counting curves". In
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where it is transverse, then we can get a homology cycle by looking at the
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Pandharipande, R.; Thomas, R. P. (2014). "13/2 ways of counting curves".
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which is just the generalized Gysin morphism of the fundamental class of
2837: 2978: 2906: 2857:. Kentaro Hori. Providence, RI: American Mathematical Society. 2003. 2718:; Newstead, Peter; Thomas, Richard P. W; Garcia-Prada, Oscar (eds.). 2077: 2026: 1982: 1196: 488:{\displaystyle {\overline {\mathcal {M}}}_{1,n}(\mathbb {P} ^{2},1)} 2792: 2931: 2728: 1736:. One natural candidate for such an obstruction bundle if given by 2778:(2020-04-09). "Virtual classes for the working mathematician". 2780:
Symmetry, Integrability and Geometry: Methods and Applications
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Virtual fundamental class of an embedding into a smooth scheme
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using the generalized Gysin morphism given by the composition
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for the divisors associated to a non-zero set of generators
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on the induced cone and the zero section, giving a cycle on
632: 431: 292: 2551:{\displaystyle _{E_{X/Y}}^{\text{vir}}:=f_{E_{X/Y}}^{!}()} 1929:. Then, we can construct the virtual fundamental class of 331:{\displaystyle {\overline {\mathcal {M}}}_{g,n}(X,\beta )} 1028:
and looking at the intersection of the induced section
623:(representing the coarse space of some moduli problem 2672: 2652: 2596: 2567: 2463: 2436: 2419:{\displaystyle \pi ^{*}:A_{k-r}(X)\to A_{k}(E_{X/Y})} 2340: 2290: 2224: 2201: 2154: 1958: 1935: 1896: 1850: 1745: 1722: 1687: 1652: 1602: 1560: 1538: 1518: 1477:{\displaystyle {\mathcal {T}}_{1},{\mathcal {T}}_{2}} 1442: 1385: 1345: 1256: 1150: 1127: 1095: 1074: 1054: 1034: 1002: 979: 959: 939: 906: 871: 851: 831: 811: 791: 759: 739: 713: 693: 673: 653: 629: 609: 556: 524: 504: 426: 387: 367: 347: 287: 253: 200: 180: 135: 194:
is a replacement of the classical fundamental class
46:. Unsourced material may be challenged and removed. 2678: 2658: 2638: 2573: 2550: 2442: 2418: 2323: 2273: 2207: 2187: 2137: 1941: 1921: 1882: 1833: 1728: 1708: 1673: 1635: 1578: 1544: 1524: 1476: 1428: 1371: 1328: 1236: 1133: 1113: 1080: 1060: 1040: 1020: 985: 965: 945: 925: 888: 857: 837: 817: 797: 777: 745: 725: 699: 679: 659: 639: 615: 583: 539: 510: 487: 409: 373: 353: 330: 259: 234: 186: 166: 2995:Virtual fundamental cycles in symplectic topology 647:) which is cut out from an ambient smooth space 2331:is the inverse of the flat pullback isomorphism 8: 167:{\displaystyle _{E^{\bullet }}^{\text{vir}}} 3075:(N ed.). New York: Springer New York. 953:. This bundle acts as the normal bundle of 3026:: CS1 maint: location missing publisher ( 3050: 2977: 2930: 2905: 2836: 2791: 2727: 2671: 2651: 2626: 2622: 2605: 2601: 2595: 2566: 2527: 2516: 2512: 2507: 2494: 2483: 2479: 2474: 2462: 2435: 2403: 2399: 2386: 2358: 2345: 2339: 2315: 2304: 2300: 2295: 2289: 2253: 2223: 2200: 2179: 2168: 2164: 2159: 2153: 2114: 2102: 2091: 2087: 2082: 2060: 2056: 2043: 2031: 2009: 2005: 1992: 1963: 1957: 1934: 1909: 1905: 1899: 1898: 1895: 1874: 1855: 1849: 1822: 1806: 1800: 1799: 1792: 1782: 1771: 1754: 1750: 1744: 1721: 1696: 1692: 1686: 1661: 1657: 1651: 1617: 1613: 1601: 1559: 1537: 1517: 1468: 1462: 1461: 1451: 1445: 1444: 1441: 1420: 1415: 1402: 1397: 1390: 1384: 1363: 1350: 1344: 1314: 1308: 1307: 1297: 1284: 1271: 1265: 1264: 1255: 1223: 1214: 1209: 1186: 1181: 1174: 1161: 1149: 1126: 1094: 1073: 1053: 1033: 1012: 1007: 1001: 978: 958: 938: 910: 905: 870: 850: 830: 810: 790: 758: 738: 712: 692: 672: 652: 631: 630: 628: 608: 575: 571: 570: 555: 531: 527: 526: 523: 503: 461: 457: 456: 440: 430: 428: 425: 392: 386: 366: 346: 301: 291: 289: 286: 252: 217: 199: 179: 158: 151: 146: 134: 106:Learn how and when to remove this message 865:is not, and it lies within a sub-bundle 2774:Battistella, Luca; Carocci, Francesca; 2706: 1488:Remark on definitions and special cases 1068:. If there is no obvious ambient space 584:{\displaystyle f:C\to \mathbb {P} ^{2}} 3019: 2878: 3064: 3062: 1141:, there is a four term exact sequence 7: 2769: 2767: 2765: 2639:{\displaystyle C_{X/Y}\cong N_{X/Y}} 1922:{\displaystyle {\mathcal {I}}_{X/Y}} 1579:{\displaystyle i:X\hookrightarrow Y} 44:adding citations to reliable sources 2454:of the previous setup is defined as 1883:{\displaystyle f_{1},\ldots ,f_{r}} 14: 1636:{\displaystyle \pi :E_{X/Y}\to X} 1429:{\displaystyle T_{Y}|_{X},E|_{X}} 1589:and a vector bundle (called the 845:is a transverse section, but if 540:{\displaystyle \mathbb {P} ^{2}} 20: 2324:{\displaystyle 0_{E_{X/Y}}^{!}} 2188:{\displaystyle f_{E_{X/Y}}^{!}} 31:needs additional citations for 2545: 2542: 2536: 2533: 2471: 2464: 2413: 2392: 2379: 2376: 2370: 2268: 2246: 2240: 2237: 2231: 2228: 2132: 2126: 2070: 2049: 2019: 1998: 1975: 1969: 1828: 1812: 1627: 1570: 1416: 1398: 1320: 1303: 1290: 1277: 1260: 1228: 1220: 1210: 1182: 1167: 1154: 1105: 1008: 772: 760: 717: 640:{\displaystyle {\mathcal {X}}} 566: 482: 479: 473: 452: 404: 398: 325: 313: 229: 223: 207: 201: 143: 136: 1: 2941:10.1017/CBO9781107279544.007 2738:10.1017/CBO9781107279544.007 435: 296: 235:{\displaystyle \in A^{*}(X)} 2585:Remarks on the construction 1372:{\displaystyle E_{1},E_{2}} 889:{\displaystyle E'\subset E} 55:"Virtual fundamental class" 3133: 2274:{\displaystyle \sigma ()=} 1646:such that the normal cone 1502:perfect obstruction theory 2452:virtual fundamental class 128:virtual fundamental class 3069:Fulton, William (1998). 2666:relevant to the variety 1114:{\displaystyle s:Y\to E} 753:has "virtual dimension" 410:{\displaystyle A_{1}(X)} 277:Kontsevich moduli spaces 2208:{\displaystyle \sigma } 1709:{\displaystyle E_{X/Y}} 1674:{\displaystyle C_{X/Y}} 900:of the cokernel bundle 825:). This is the case if 518:the class of a line in 2885:: CS1 maint: others ( 2810:10.3842/SIGMA.2020.026 2680: 2660: 2640: 2575: 2559: 2552: 2444: 2428: 2420: 2325: 2282: 2275: 2209: 2189: 2146: 2139: 1943: 1923: 1884: 1842: 1835: 1787: 1730: 1710: 1675: 1644: 1637: 1587: 1580: 1546: 1526: 1494:Deligne-Mumford stacks 1478: 1430: 1373: 1337: 1330: 1245: 1238: 1135: 1115: 1082: 1062: 1042: 1022: 1021:{\displaystyle E|_{X}} 987: 967: 947: 927: 890: 859: 839: 819: 799: 779: 747: 727: 726:{\displaystyle E\to Y} 701: 681: 661: 641: 617: 592: 585: 541: 512: 496: 489: 411: 375: 374:{\displaystyle \beta } 355: 339: 332: 261: 236: 188: 168: 3030:) CS1 maint: others ( 2716:Brambila-Paz, Leticia 2696:Chow group of a stack 2681: 2661: 2641: 2576: 2553: 2456: 2445: 2421: 2333: 2326: 2276: 2217: 2210: 2190: 2140: 1951: 1944: 1924: 1885: 1836: 1767: 1738: 1731: 1711: 1676: 1638: 1595: 1581: 1553: 1547: 1532:into a smooth scheme 1527: 1498:intrinsic normal cone 1479: 1431: 1374: 1331: 1249: 1239: 1143: 1136: 1116: 1083: 1063: 1043: 1023: 988: 968: 948: 928: 891: 860: 840: 820: 800: 780: 778:{\displaystyle (n-r)} 748: 728: 702: 682: 662: 642: 618: 586: 549: 542: 513: 490: 419: 412: 376: 356: 333: 280: 267:rational curves on a 262: 237: 189: 169: 2925:. pp. 282–333. 2722:. pp. 282–333. 2670: 2650: 2594: 2565: 2461: 2434: 2338: 2288: 2222: 2199: 2152: 1956: 1933: 1894: 1848: 1743: 1720: 1685: 1650: 1600: 1558: 1536: 1516: 1440: 1383: 1343: 1254: 1148: 1125: 1093: 1072: 1052: 1032: 1000: 977: 957: 937: 926:{\displaystyle E/E'} 904: 869: 849: 829: 809: 805:is the dimension of 789: 757: 737: 711: 691: 671: 651: 627: 607: 598:Geometric motivation 554: 522: 502: 424: 385: 365: 345: 285: 273:Gromov–Witten theory 251: 198: 178: 133: 124:enumerative geometry 40:improve this article 3117:Intersection theory 3072:Intersection Theory 2802:2020SIGMA..16..026B 2776:Manolache, Cristina 2532: 2499: 2320: 2215:is the map given by 2184: 2108: 2107: 2037: 1986: 1203: 163: 2676: 2656: 2636: 2571: 2548: 2503: 2470: 2440: 2416: 2321: 2291: 2271: 2205: 2185: 2155: 2135: 2078: 1939: 1919: 1880: 1831: 1726: 1706: 1671: 1633: 1591:obstruction bundle 1576: 1542: 1522: 1474: 1426: 1369: 1326: 1234: 1131: 1111: 1078: 1058: 1038: 1018: 983: 963: 943: 923: 886: 855: 835: 815: 795: 775: 743: 723: 697: 677: 657: 637: 613: 581: 537: 508: 485: 407: 371: 351: 328: 271:. For example, in 257: 232: 184: 164: 142: 3082:978-1-4612-1700-8 3005:978-1-4704-5014-4 2679:{\displaystyle X} 2659:{\displaystyle Y} 2574:{\displaystyle Y} 2497: 2443:{\displaystyle 0} 2109: 2038: 1987: 1942:{\displaystyle X} 1729:{\displaystyle X} 1545:{\displaystyle Y} 1525:{\displaystyle X} 1379:act similarly to 1226: 1204: 1134:{\displaystyle X} 1081:{\displaystyle Y} 1061:{\displaystyle X} 1041:{\displaystyle s} 986:{\displaystyle Y} 966:{\displaystyle X} 946:{\displaystyle X} 858:{\displaystyle s} 838:{\displaystyle s} 818:{\displaystyle Y} 798:{\displaystyle n} 746:{\displaystyle X} 700:{\displaystyle r} 680:{\displaystyle s} 660:{\displaystyle Y} 616:{\displaystyle X} 511:{\displaystyle H} 438: 354:{\displaystyle X} 299: 269:quintic threefold 260:{\displaystyle d} 187:{\displaystyle X} 161: 116: 115: 108: 90: 3124: 3095: 3094: 3066: 3057: 3056: 3054: 3052:alg-geom/9602007 3042: 3036: 3035: 3025: 3017: 2990: 2984: 2983: 2981: 2969: 2963: 2962: 2934: 2918: 2912: 2911: 2909: 2897: 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Index


verification
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"Virtual fundamental class"
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scholar
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mathematics
enumerative geometry
Chow ring
quintic threefold
Gromov–Witten theory
Kontsevich moduli spaces
Euler class
Deligne-Mumford stacks
intrinsic normal cone
perfect obstruction theory
Chow group of a stack
Brambila-Paz, Leticia
arXiv
1111.1552
doi
10.1017/CBO9781107279544.007
ISBN
9781107279544
S2CID

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