Cosmological solutions of supercritical string theory

Abstract

We study quintessence-driven, spatially flat, expanding FRW cosmologies that arise naturally from string theory formulated in a supercritical number of spacetime dimensions. The tree-level potential of the string theory produces an equation of state at the threshold between accelerating and decelerating cosmologies, and the resulting spacetime is globally conformally equivalent to Minkowski space. We demonstrate that exact solutions exist with a condensate of the closed-string tachyon, the simplest of which is a Liouville wall moving at the speed of light. We rely on the existence of this solution to derive constraints on the couplings of the tachyon to the dilaton and metric in the string theory effective action. In particular, we show that the tachyon dependence of the Einstein term must be nontrivial.

v2: typos corrected and references added; v3: minor corrections; 35 pages, 9 figures

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Cited by in corpus (46)

• Sharpening the Distance Conjecture in Diverse Dimensions
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• Charting the landscape of supercritical string theory
• Hyperbolic compactification of M-theory and de Sitter quantum gravity
• Asymptotic Scalar Field Cosmology in String Theory
• UV Completions for Non-Critical Strings
• Asymptotic Observables and the Swampland
• Supercritical stability, transitions and (pseudo)tachyons
• A Short Review of Time Dependent Solutions and Space-like Singularities in String Theory
• Dynamical Cobordism and the Beginning of Time: Supercritical Strings and Tachyon Condensation
• New Dimensions for Wound Strings: The Modular Transformation of Geometry to Topology
• Future Foam
• New solutions with accelerated expansion in string theory
• Stringy instability inside the black hole
• String Cosmology - Large-Field Inflation in String Theory
• Dynamics and Stability of Light-Like Tachyon Condensation
• Modeling Quantum Gravity Effects in Inflation
• Les Houches lectures on inflationary observables and string theory
• Small Black Hole Explosions
• Non-Relativistic Superstring Theories
• String spectra near some null cosmological singularities
• The Averaged Null Energy Condition and the Black Hole Interior in String Theory
• Discrete gauge symmetries from (closed string) tachyon condensation
• Stable Vacua for Tachyonic Strings
• Cosmology of the closed string tachyon
• Supercritical N = 2 string theory
• Dimensional Duality
• Topologically Massive Gravity and Ricci-Cotton Flow
• M-Theory Through the Looking Glass: Tachyon Condensation in the E_8 Heterotic String
• Light-like tachyon condensation in Open String Field Theory
• A stable vacuum of the tachyonic E8 string
• World Sheet Commuting βγCFT and Non-Relativistic String Theories
• Rolling Near the Tachyon Vacuum
• String Theory and The Arrow of Time
• Closed tachyon solitons in type II string theory
• Quantum Effects on Tachyon Dynamics
• Late-time Structure of the Bunch-Davies FRW Wavefunction
• Dynamical Cobordisms in General Relativity and String Theory
• Supercriticality of a Class of Critical String Cosmological Solutions
• A note on tachyon actions in string theory
• Lectures on Naturalness, String Landscape and Multiverse
• D-dualized D-brane
• A worldsheet perspective on string inflation
• Black hole hair in higher dimensions
• One-loop bosonic string and De Sitter space
• Exact null tachyons from RG flows