Exotic Spheres' Metrics and Solutions via Kaluza-Klein Techniques

Abstract

By applying an inverse Kaluza-Klein procedure, we provide explicit coordinate expressions for Riemannian metrics on two homeomorphic but not diffeomorphic spheres in seven dimensions. We identify Milnor's bundles, among which ten out of the fourteen exotic seven-spheres appear (ignoring orientation), with non-principal bundles having homogeneous fibres. Then, we use the techniques in \cite{10.1063/1.525753} to obtain a general ansatz for the coordinate expression of a metric on the total space of any Milnor's bundle. The ansatz is given in terms of a metric on $S^4$, a metric on $S^3$ (which can smoothly vary throughout $S^4$), and a connection on the principal $SO(4)$-bundle over $S^4$. As a concrete example, we present explicit formulae for such metrics for the ordinary sphere and the Gromoll-Meyer exotic sphere. Then, we perform a non-abelian Kaluza-Klein reduction to gravity in seven dimensions, according to (a slightly simplified version of) the metric ansatz above. We obtain the standard four-dimensional Einstein-Yang-Mills system, for which we find solutions associated with the geometries of the ordinary sphere and of the exotic one. The two differ by the winding numbers of the instantons involved.

arXiv comment27 pages. v2: published version (JHEP), minor corrections

References in corpus (9)

• Large N Field Theories, String Theory and Gravity
• AdS_4/CFT_3 -- Squashed, Stretched and Warped
• The structure of N=3 multiplets in AdS_4 and the complete Osp(3|4) X SU(3) spectrum of M-theory on AdS_4 X N^{010}
• Yang-Mills Instantons from Gravitational Instantons
• How to obtain a cosmological constant from small exotic R^4
• Exotic Differentiable Structures and General Relativity
• Spherical T-duality II: An infinity of spherical T-duals for non-principal SU(2)-bundles
• On the Hamiltonian reduction of geodesic motion on SU(3) to SU(3)/SU(2)
• Exotic Spaces in Quantum Gravity I: Euclidean Quantum Gravity in Seven Dimensions

Cited by in corpus (2)

• Calabi-Yau Four/Five/Six-folds as ${\mathbb{P}}_{\text{w}}^n$ Hypersurfaces: Machine Learning, Approximation, and Generation
• AInstein: Numerical Einstein Metrics via Machine Learning