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Dirac-Born-Infeld inflation model with kinetic coupling to Einstein gravity

Taotao Qiu

  • Key Laboratory of Quark and Lepton Physics (MOE) and College of Physical Science & Technology, Central China Normal University, Wuhan 430079, People’s Republic of China and State Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100190, People’s Republic of China

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Phys. Rev. D 93, 123515 – Published 13 June, 2016

DOI: https://doi.org/10.1103/PhysRevD.93.123515

Abstract

In this paper, we study a new class of inflation models which generalize the Dirac-Born-Infeld (DBI) action with the addition of a nonminimal kinetic coupling (NKC) term. We dub this model as the new DBI inflation model. The NKC term does not bring a new dynamical degree of freedom, so the equations of motion remain of second order. However, with such coupling, the action is no longer linear with respect to the Einstein curvature term (R or Gμν), which leads to a correction term of k4 in the perturbations. The new DBI inflation model can be viewed as a theory beyond Horndeski. Without violating approximate scale invariance, such correction may lead to new effects on the inflationary spectra that can be tested by future observations.

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Phys. Rev. D 93, 123515– Published 13 June, 2016
  • Received 28 February 2016

© 2016 American Physical Society

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