3 papers
gr-qc2026
Circularly polarized gravitational waves from parity-violating scalar-tensor theory
Jia-Xi Feng, Jia-Yuan Fang, Xian Gao
We study both primordial gravitational waves (GWs) and scalar-induced gravitational waves (SIGWs) in a class of the parity-violating scalar-tensor (PVST) theory, of which the Lagra…
gr-qc2024
Scalar induced gravitational waves in chiral scalar-tensor theory of gravity
Jia-Xi Feng, Fengge Zhang, Xian Gao
We study the scalar induced gravitational waves (SIGWs) from a chiral scalar-tensor theory of gravity. The parity-violating (PV) Lagrangian contains the Chern-Simons (CS) term and…
gr-qc2024
Scalar induced gravitational waves in metric teleparallel gravity with the Nieh-Yan term
Fengge Zhang, Jia-Xi Feng, Xian Gao
We investigate the scalar induced gravitational waves (SIGWs) in metric teleparallel gravity with the Nieh-Yan (NY) term, which results in parity violation during the radiation-dom…