Modified teleparallel gravity: inflation without an inflaton

RAFAEL FERRARO; FRANCO FIORINI

PHYSICAL REVIEW D - PARTICLE AND FILDS

American Physical Society

Lugar: New York; Año: 2007 vol. 75 p. 840311 - 840315

0556-2821

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.