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Scientific article
Open access
English

Anomaly-induced effective action and Chern–Simons modification of general relativity

Published inPhysics letters. B, vol. 746, p. 372-378
Collection
  • Open Access - SCOAP3
Publication date2015
Abstract

Recently it was shown that the quantum vacuum effects of massless chiral fermion field in curved space–time leads to the parity-violating Pontryagin density term, which appears in the trace anomaly with imaginary coefficient. In the present work the anomaly-induced effective action with the parity-violating term is derived. The result is similar to the Chern–Simons modified general relativity, which was extensively studied in the last decade, but with the kinetic terms for the scalar different from those considered previously in the literature. The parity-breaking term makes no effect on the zero-order cosmology, but it is expected to be relevant in the black hole solutions and in the cosmological perturbations, especially gravitational waves.

Keywords
  • Effective action
  • Conformal anomaly
  • Chern–Simons gravity
Citation (ISO format)
MAURO, Sebastião, SHAPIRO, Ilya. Anomaly-induced effective action and Chern–Simons modification of general relativity. In: Physics letters. B, 2015, vol. 746, p. 372–378. doi: 10.1016/j.physletb.2015.05.045
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Article (Published version)
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ISSN of the journal0370-2693
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