Time varying speed of light as a solution to cosmological puzzles
Abstract
We consider the cosmological implications of light travelling faster in the early Universe. We propose a prescription for deriving corrections to the cosmological evolution equations while the speed of light c is changing. We then show how the horizon, flatness, and cosmological constant problems may be solved. We also study cosmological perturbations in this scenario and show how one may solve the homogeneity and isotropy problems. As it stands, our scenario appears to most easily produce extreme homogeneity, requiring structure to be produced in the standard big bang epoch. Producing significant perturbations during the earlier epoch would require a rather careful design of the function c(t). The large entropy inside the horizon nowadays can also be accounted for in this scenario.
 Publication:

Physical Review D
 Pub Date:
 February 1999
 DOI:
 10.1103/PhysRevD.59.043516
 arXiv:
 arXiv:astroph/9811018
 Bibcode:
 1999PhRvD..59d3516A
 Keywords:

 98.80.Cq;
 95.30.Sf;
 Particletheory and fieldtheory models of the early Universe;
 Relativity and gravitation;
 Astrophysics;
 General Relativity and Quantum Cosmology;
 High Energy Physics  Theory
 EPrint:
 To be published in Physical Review D. Note added referring to John Moffat's early work on VSL theories