Out of the dark: WISPs in String Theory and the Early Universe
Proceedings of 1st General Meeting and 1st Training School of the COST Action COSMIC WSIPers — PoS(COSMICWISPers) Sissa Medialab Srl (2024) 001
String Theory and the First Half of the Universe
(2024)
Kination, meet Kasner: on the asymptotic cosmology of string compactifications
Journal of High Energy Physics Springer 2023:8 (2023) 156
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.String Cosmology: from the Early Universe to Today
(2023)
Kination, Meet Kasner: On The Asymptotic Cosmology of String Compactifications
(2022)