Abstract
We study runaway, kination-dominated epochs in string cosmology. We show how the apparent classical decompactification runaway of the volume modulus, described by a kination epoch in the 4-dimensional EFT, can be uplifted to a classical Kasner solution in 10d in which the non-compact dimensions collapse towards a Big Crunch. This can also be generalised for arbitrary spacetime and compactification dimensions. We conclude with some comments on how this picture is modified by quantum effects, and the need for both dynamical and kinematical Swampland constraints.
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Acknowledgments
We thank Prateek Agrawal, Ed Copeland, Thomas Grimm and Sirui Ning for discussions and the anonymous referees for comments. FA is supported by the Clarendon Scholarship in partnership with the Scatcherd European Scholarship, Saven European Scholarship, and the Hertford College Peter Howard Scholarship. We acknowledge support from STFC grant ST/T000864/1. The research of FR is partly supported by the Dutch Research Council (NWO) via a Start-Up grant and a Vici grant. MM is supported by the St John’s College Graduate Scholarship in partnership with STFC. For the purpose of Open Access, the authors have applied a CC BY public copyright licence to any Author Accepted Manuscript version arising from this submission.
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Apers, F., Conlon, J.P., Mosny, M. et al. Kination, meet Kasner: on the asymptotic cosmology of string compactifications. J. High Energ. Phys. 2023, 156 (2023). https://doi.org/10.1007/JHEP08(2023)156
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DOI: https://doi.org/10.1007/JHEP08(2023)156