• Rapid Communication

Dynamical scalar degree of freedom in Hořava-Lifshitz gravity

Rong-Gen Cai, Bin Hu, and Hong-Bo Zhang
Phys. Rev. D 80, 041501(R) – Published 17 August 2009

Abstract

We investigate the linear cosmological perturbations of Hořava-Lifshitz gravity in a Friedmann-Robertson-Walker universe without any matter. Our results show that a new gauge-invariant dynamical scalar mode emerges, due to the gauge transformation under the “foliation-preserving” diffeomorphism and “projectability condition,” and it can produce a scale invariant power spectrum. In the infrared regime with λ=1, the dynamical scalar degree of freedom turns to be a nondynamical one at the linear order level.

  • Received 13 May 2009

DOI:https://doi.org/10.1103/PhysRevD.80.041501

©2009 American Physical Society

Authors & Affiliations

Rong-Gen Cai1,*, Bin Hu1,†, and Hong-Bo Zhang1,2,‡

  • 1Key Laboratory of Frontiers in Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, P.O. Box 2735, Beijing 100190, China
  • 2Graduate University of Chinese Academy of Sciences, YuQuan Road 19A, Beijing 100049, China

  • *cairg@itp.ac.cn
  • hubin@itp.ac.cn
  • hbzhang@itp.ac.cn

Article Text (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 80, Iss. 4 — 15 August 2009

Reuse & Permissions
Access Options
Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review D

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×