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Circularly polarized scalar induced gravitational waves from the Chern-Simons modified gravity

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arxiv 2205.12045 v2 pith:JRAUPTDP submitted 2022-05-24 gr-qc

Fengge Zhang , Jia-Xi Feng , Xian Gao This is my paper · ORCID
classification gr-qc
keywords sigwschern-simonscircularlygravitationalgravityinducedmathrmmodified
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abstract

We investigate the scalar induced gravitational waves (SIGWs) in the Chern-Simons (CS) modified gravity during the radiation dominated era. The SIGWs are circularly polarized, which provide us a tool to test the possible parity violation in the early universe. We derive the semianalytic expressions to evaluate the fractional energy density of the SIGWs, $\Omega_{\mathrm{GW}}$, which receives contributions from the general relativity (GR) and the correction due to the parity-violating term, respectively. We find that the degree of the circular polarization of the SIGWs can be as large as of order unity, although the contribution to $\Omega_{\mathrm{GW}}$ from the CS term is at most of the same order as that from the GR.

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Cited by 3 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Correlated parity violation in gravity and electromagnetism from five-dimensional spacetime

    gr-qc 2026-08 conditional novelty 7.0 of 10

    A five-dimensional teleparallel Kaluza-Klein action produces a single parameter-free prediction: the electromagnetic helicity dispersion shift is exactly six times the gravitational one.

  2. Parity-violating spatially covariant gravity at total derivative order $d=5$

    gr-qc 2026-07 conditional novelty 6.0 of 10

    At total derivative order five, parity-violating spatially covariant gravity has exactly 59 independent monomials, and their tensor-perturbation response is controlled by four coefficient combinations producing helici...

  3. Circularly polarized gravitational waves from parity-violating scalar-tensor theory

    gr-qc 2026-02 conditional novelty 6.0 of 10

    In the "Qi-Xiu" parity-violating scalar-tensor theory, the L3 and L4 interactions leave linear gravitational-wave propagation GR-like but still generate circularly polarized scalar-induced gravitational waves.

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