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General Relativity and Gravitation

, Volume 45, Issue 10, pp 1989–2001 | Cite as

Comments on gauge-invariance in cosmology

  • Karim A. Malik
  • David R. Matravers
Research Article

Abstract

We revisit the gauge issue in cosmological perturbation theory, and highlight its relation to the notion of covariance in general relativity. We also discuss the similarities and differences of the covariant approach in perturbation theory to the Bardeen or metric approach in a non-technical fashion.

Keywords

Perturbation theory Theoretical cosmology Covariant formalism 

Notes

Acknowledgments

The authors are grateful to Ellie Nalson, Iain Brown, Adam Christopherson, Juan Valiente-Kroon, and David Wands for useful discussions and comments. KAM is supported in part by the STFC under Grants ST/G002150/1, ST/H002855/1, and ST/J001546/1.

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Copyright information

© Springer Science+Business Media New York 2013

Authors and Affiliations

  1. 1.Astronomy Unit, School of Physics and AstronomyQueen Mary University of LondonLondonUK
  2. 2.Institute of Cosmology and GravitationUniversity of PortsmouthPortsmouthUK

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