TITLE:
Dirac-Born-Infeld-Einstein Theory with Weyl Invariance
AUTHORS:
Takuya Maki, Nahomi Kan, Kiyoshi Shiraishi
KEYWORDS:
Modified Theories of Gravity; Weyl Invariance; Inflation
JOURNAL NAME:
Journal of Modern Physics,
Vol.3 No.9,
September
25,
2012
ABSTRACT: Weyl invariant gravity has been investigated as the fundamental theory of the vector inflation. Accordingly, we consider a Weyl invariant extension of Dirac-Born-Infeld type gravity. We find that an appropriate choice of the metric removes the scalar degree of freedom which is at the first sight required by the local scale invariance of the action, and then a vector field acquires mass. Then non-minimal couplings of the vector field and curvatures are induced. We find that the Dirac-Born-Infeld type gravity is a suitable theory to the vector inflation scenario.