Modified teleparallel gravity: Inflation without an inflaton
Abstract
The Born-Infeld strategy to smooth theories having divergent solutions is applied to the teleparallel equivalent of general relativity. Differing from other theories of modified gravity, modified teleparallelism leads to second order equations, since the teleparallel Lagrangian only contains first derivatives of the vierbein. We show that the Born-Infeld-modified teleparallelism solves the particle horizon problem in a spatially flat Friedmann-Robertson-Walker (FRW) universe by providing an initial exponential expansion without resorting to an inflaton field.
- Publication:
-
Physical Review D
- Pub Date:
- April 2007
- DOI:
- 10.1103/PhysRevD.75.084031
- arXiv:
- arXiv:gr-qc/0610067
- Bibcode:
- 2007PhRvD..75h4031F
- Keywords:
-
- 04.50.+h;
- 98.80.Jk;
- Gravity in more than four dimensions Kaluza-Klein theory unified field theories;
- alternative theories of gravity;
- Mathematical and relativistic aspects of cosmology;
- General Relativity and Quantum Cosmology;
- Astrophysics;
- High Energy Physics - Theory
- E-Print:
- 4 pages, 2 figures. Version to be published in Physical Review D