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 [1] 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 S4, a metric on S3 (which can smoothly vary throughout S4), and a connection on the principal SO(4)-bundle over S4. 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.
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Acknowledgments
I am particularly grateful to my supervisor, Professor David Berman. For introducing me to the existence of exotic spheres, for the support and the stimulating discussions. I would also like to thank Guglielmo Tarallo, for his help with bundle theory. I am grateful Professor Johnson, Professor Schleich and Professor Derdzinski (in chronological order) for their support during the early stages of this project. Finally, I would like to thank Dr Mattia Cesaro for his comments on the manuscript. This work was funded by an STFC studentship.
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Schettini Gherardini, T. Exotic spheres’ metrics and solutions via Kaluza-Klein techniques. J. High Energ. Phys. 2023, 100 (2023). https://doi.org/10.1007/JHEP12(2023)100
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DOI: https://doi.org/10.1007/JHEP12(2023)100