期刊
PHYSICS LETTERS B
卷 746, 期 -, 页码 372-378出版社
ELSEVIER
DOI: 10.1016/j.physletb.2015.05.045
关键词
Effective action; Conformal anomaly; Chern-Simons gravity
资金
- CAPES
- Departement de Physique Theorique
- Center for Astroparticle Physics of Universite de Geneve
- CNPq
- FAPEMIG
- ICTP
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. (C) 2015 The Authors. Published by Elsevier B.V.
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