Cosmology from String Theory

Abstract

We explore the cosmological content of Salam-Sezgin six dimensional supergravity, and find a solution to the field equations in qualitative agreement with observation of distant supernovae, primordial nucleosynthesis abundances, and recent measurements of the cosmic microwave background. The carrier of the acceleration in the present de Sitter epoch is a quintessence field slowly rolling down its exponential potential. Intrinsic to this model is a second modulus which is automatically stabilized and acts as a source of cold dark matter with a mass proportional to an exponential function of the quintessence field (hence realizing VAMP models within a String context). However, any attempt to saturate the present cold dark matter component in this manner leads to unacceptable deviations from cosmological data -- a numerical study reveals that this source can account for up to about 7% of the total cold dark matter budget. We also show that (1) the model will support a de Sitter energy in agreement with observation at the expense of a miniscule breaking of supersymmetry in the compact space; (2) variations in the fine structure constant are controlled by the stabilized modulus and are negligible; (3) ``fifth''forces are carried by the stabilized modulus and are short range; (4) the long time behavior of the model in four dimensions is that of a Robertson-Walker universe with a constant expansion rate (w = -1/3). Finally, we present a String theory background by lifting our six dimensional cosmological solution to ten dimensions.

Version to be published in Physical Review D

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Cited by in corpus (11)

• In Search for Extraterrestrial High Energy Neutrinos
• Late Decaying Dark Matter, Bulk Viscosity and the Cosmic Acceleration
• $H_0$ tension and the String Swampland
• Unification of inflation, dark energy, and dark matter within the Salam-Sezgin cosmological model
• Coupled dark energy and dark matter from dilatation anomaly
• Dark energy, Ricci-nonflat spaces, and the Swampland
• Gravitational wave generation in power-law inflationary models
• Dynamical F-strings intersecting D2-branes in type IIA supergravity
• Dissecting the $H_0$ and $S_8$ tensions with Planck + BAO + supernova type Ia in multi-parameter cosmologies
• Breaking Free from the Swampland of Impossible Universes through the DESI Portal
• Manifestations of String Theory in Astrophysical Data and at the LHC