English

Primordial massive gravitational waves from Einstein-Chern-Simons-Weyl gravity

General Relativity and Quantum Cosmology 2015-06-22 v2 High Energy Physics - Theory

Abstract

We investigate the evolution of cosmological perturbations during de Sitter inflation in the Einstein-Chern-Simons-Weyl gravity. Primordial massive gravitational waves are composed of one scalar, two vector and four tensor circularly polarized modes. We show that the vector power spectrum decays quickly like a transversely massive vector in the superhorizon limit z0z\to 0. In this limit, the power spectrum coming from massive tensor modes decays quickly, leading to the conventional tensor power spectrum. Also, we find that in the limit of m20m^2 \to 0 (keeping the Weyl-squared term only), the vector and tensor power spectra disappear. It implies that their power spectra are not gravitationally produced because they (vector and tensor) are decoupled from the expanding de Sitter background, as a result of conformal invariance.

Keywords

Cite

@article{arxiv.1406.4367,
  title  = {Primordial massive gravitational waves from Einstein-Chern-Simons-Weyl gravity},
  author = {Yun Soo Myung and Taeyoon Moon},
  journal= {arXiv preprint arXiv:1406.4367},
  year   = {2015}
}

Comments

1+24 pages, no figure, version accepted for publication in JCAP

R2 v1 2026-06-22T04:40:20.068Z