Complete noncompact Spin(7) manifolds from self-dual Einstein 4–orbifolds
Complete noncompact Spin(7) manifolds from
self-dual Einstein 4–orbifolds
复制标题
完整的非紧 Spin(7) 流形
DOI:
10.2140/gt.2021.25.339
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发表时间:
2019
影响因子:
2
通讯作者:
Lorenzo Foscolo
中科院分区:
文献类型:
--
作者:
Lorenzo Foscolo
We present an analytic construction of complete non-compact 8-dimensional Ricci-flat manifolds with holonomy Spin(7). The construction relies on the study of the adiabatic limit of metrics with holonomy Spin(7) on principal Seifert circle bundles over asymptotically conical G2 orbifolds. The metrics we produce have an asymptotic geometry, so-called ALC geometry, that generalises to higher dimensions the geometry of 4-dimensional ALF hyperk\"ahler metrics. We apply our construction to asymptotically conical G2 metrics arising from self-dual Einstein 4-orbifolds with positive scalar curvature. As illustrative examples of the power of our construction, we produce complete non-compact Spin(7) manifolds with arbitrarily large second Betti number and infinitely many distinct families of ALC Spin(7) metrics on the same smooth 8-manifold.
影响因子:
1.5
作者:
Martelli D
通讯作者:
Martelli D
影响因子:
0.7
作者:
Karigiannis S
通讯作者:
Karigiannis S