Modified Teleparallel Gravity: inflation without an inflaton

R. FERRARO AND F. FIORINI

PHYSICAL REVIEW D - PARTICLE AND FILDS

APS

Año: 2007 vol. 78 p. 84031 - 84035

0556-2821

Born-Infeld strategy to smooth theories having divergent solutions is applied to teleparallel equivalent of General Relativity. Differing from other theories of modified gravity, modified teleparallelism leads to second order equations, since teleparallel Lagrangian only contains first derivatives of the vierbein. We show that Born-Infeld-modified teleparallelism solves the particle horizon problem in a spatially flat FRW universe by providing an initial exponential expansion without resorting to an inflaton field.