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General Relativity and Gravitation

, Volume 37, Issue 10, pp 1665–1670 | Cite as

The string coupling accelerates the expansion of the universed

  • John Ellis
  • Nikolaos E. Mavromatos
  • Dimitri V. Nanopoulos
Essay

Abstract

Generic cosmological models in non-critical string theory have a time-dependent dilaton background at a late epoch. The cosmological deceleration parameter q 0 is given by the square of the string coupling, g s 2, up to a negative sign. Hence the expansion of the Universe must accelerate eventually, and the observed value of q 0 corresponds to g s 2 ∼ 0.6. In this scenario, the string coupling is asymptotically free at large times, but its present rate of change is imperceptibly small.

Keywords

Cosmology Dilaton background 

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Copyright information

© Springer-Verlag 2005

Authors and Affiliations

  • John Ellis
    • 1
  • Nikolaos E. Mavromatos
    • 2
  • Dimitri V. Nanopoulos
    • 3
    • 4
    • 5
  1. 1.TH Division, Physics DepartmentCERNGeneva 23Switzerland
  2. 2.Theoretical Physics, Physics DepartmentKing's College LondonStrandUK
  3. 3.George P. and Cynthia W. Mitchell Institute for Fundamental PhysicsTexas A&M UniversityCollege StationUSA
  4. 4.Astroparticle Physics GroupHouston Advanced Research Center (HARC)WoodlandsUSA
  5. 5.Academy of Athens, Academy of AthensDivision of Natural SciencesAthensGreece

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