Modified teleparallel gravity: inflation without inflaton

Details Modified teleparallel gravity: inflation without inflaton Modified teleparallel gravity: inflation without inflaton

2006-10-12

arxiv.org/abs/gr-qc/0610067v2

Phys.Rev.D75:084031,2007

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

4 pages, 2 figures. Version to be published in Physical Review D

Scientific paper

10.1103/PhysRevD.75.084031

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.

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