New solutions with accelerated expansion in string theory

Abstract

We present concrete solutions with accelerated expansion in string theory, requiring a small, tractable list of stress energy sources. We explain how this construction (and others in progress) evades previous no go theorems for simple accelerating solutions. Our solutions respect an approximate scaling symmetry and realize discrete sequences of values for the equation of state, including one with an accumulation point at w=-1 and another accumulating near w=-1/3 from below. In another class of models, a density of defects generates scaling solutions with accelerated expansion. We briefly discuss potential applications to dark energy phenomenology, and to holography for cosmology.

37 pages, 1 figure. v2: comments and references added

References in corpus (23)

• Cosmology and the Fate of Dilatation Symmetry
• Monodromy in the CMB: Gravity Waves and String Inflation
• Flux Compactification
• An Ignoble Approach to Large Field Inflation
• Les Houches Lectures on Constructing String Vacua
• Inflationary Constraints on Type IIA String Theory
• The Cosmological Constant and the String Landscape
• Micromanaging de Sitter holography
• A Holographic Framework for Eternal Inflation
• Axions as Quintessence in String Theory
• de Sitter Space in Non-Critical String Theory
• String Inflation After Planck 2013
• Nonperturbative Instability of AdS_5 x S^5/Z_k
• Cosmological solutions of supercritical string theory
• Dimension-changing exact solutions of string theory
• Higher Spin de Sitter Holography from Functional Determinants
• Charting the landscape of supercritical string theory
• Supercritical stability, transitions and (pseudo)tachyons
• New Dimensions for Wound Strings: The Modular Transformation of Geometry to Topology
• Cosmological unification of string theories
• Principal components of dark energy with SNLS supernovae: the effects of systematic errors
• Boom and Bust Inflation: a Graceful Exit via Compact Extra Dimensions
• Exploring Spiral Inflation in String Theory

Cited by in corpus (21)

• What if string theory has no de Sitter vacua?
• The landscape, the swampland and the era of precision cosmology
• The Powers of Monodromy
• Dark energy, $\alpha$-attractors, and large-scale structure surveys
• Gaugino condensation and small uplifts in KKLT
• Sharpening the Distance Conjecture in Diverse Dimensions
• Challenges for Large-Field Inflation and Moduli Stabilization
• Drifting Oscillations in Axion Monodromy
• de Sitter extrema and the swampland
• Weakly Coupled de Sitter Vacua with Fluxes and the Swampland
• Tachyons in Classical de Sitter Vacua
• Hyperbolic compactification of M-theory and de Sitter quantum gravity
• Asymptotic Scalar Field Cosmology in String Theory
• Asymptotic Observables and the Swampland
• Les Houches lectures on inflationary observables and string theory
• Tilt and Tensor-to-Scalar Ratio in Multifield Monodromy Inflation
• Contracting Cosmologies and the Swampland
• Bianchi IX geometry and the Einstein-Maxwell theory
• Late-time Structure of the Bunch-Davies FRW Wavefunction
• Hitchhiker's Guide to the Swampland: The Cosmologist's Handbook to the string-theoretical Swampland Programme
• $d{S}_4$ vacua from matter-coupled 4D N=4 gauged supergravity