Journal of High Energy Physics

, 2014:50 | Cite as

New solutions with accelerated expansion in string theory

  • Matthew Dodelson
  • Xi Dong
  • Eva Silverstein
  • Gonzalo Torroba
Open Access
Regular Article - Theoretical Physics


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.


Flux compactifications Superstring Vacua dS vacua in string theory 


Open Access

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Copyright information

© The Author(s) 2014

Authors and Affiliations

  • Matthew Dodelson
    • 1
  • Xi Dong
    • 1
  • Eva Silverstein
    • 1
    • 2
    • 3
  • Gonzalo Torroba
    • 1
  1. 1.Stanford Institute for Theoretical PhysicsStanford UniversityStanfordU.S.A.
  2. 2.SLAC National Accelerator LaboratoryMenlo ParkU.S.A.
  3. 3.Kavli Institute for Particle Astrophysics and CosmologyStanfordU.S.A.

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