Dark Energy in String Theory

Abstract

We consider various candidates for Dark Energy, motivated by string theory. Several no-go theorems push de Sitter string vacua, with $w=-1$, to the limits of theoretical control, and all known examples depend on a delicate interplay between different string theoretic ingredients. On the other hand, runaway moduli directions are ubiquitous in string theory, and could plausibly source slow-roll quintessence. We consider various candidate supergravity potentials, motivated by string theory, including single-field Kähler potentials for bulk and local moduli, and leading superpotentials of the form $W=W_0+A{e}^{-a\Phi }$ or $W=W_0+A{\Phi }^p$. Conditions on the scalar potential imposed by supergravity are very restrictive, ruling out e.g. quintessence with $K=-n\ln (\Phi +\bar{\Phi })$ and $W=W_0+A{\Phi }^p$. Out of the examples considered, one can simultaneously satisfy $V>0$ and ${\epsilon }_V<1$ only for a deformation-like modulus with $K=k_0+\frac{|\Phi {|}^{2n}}{k1}$ and a blow-up like modulus with $K=k_0+\frac{(\Phi +\bar{\Phi }{)}^{2n}}{k_1}$ when the leading order in the perturbative superpotential, $p$, is equal to $n$. We also review the scenario of Thermal Dark Energy, where thermal effects in a light hidden sector hold a scalar field up away from the minimum of its zero-temperature potential. This provides a viable model of Dark Energy with $w=-1$, consistent with known swampland conjectures, and motivates further early Thermal Dark Energy epochs with potentially observable consequences.

23 pages, 4 figures, 3 tables, contribution to the proceedings of the Corfu Summer Institute 2019 "School and Workshops on Elementary Particle Physics and Gravity (CORFU2019)", includes work published in arXiv:1810.08634 (Olguin-Trejo, SLP, Tasinato, IZ) and arXiv:1907.10141 (Hardy, SLP), and some new results

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