Zobrazeno 1 - 10
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pro vyhledávání: '"Zhang Fengge"'
The stochastic gravitational wave background (SGWB) provides a unique opportunity to probe the early Universe, potentially encoding information about the primordial curvature power spectrum and the energy scale of reheating. Recent observations by co
Externí odkaz:
http://arxiv.org/abs/2407.15501
Publikováno v:
Eur.Phys.J.C 84 (2024) 7, 736
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 PV scalar-tensor terms, which are built of the quadratic Riemann tenso
Externí odkaz:
http://arxiv.org/abs/2404.05289
Publikováno v:
Phys. Rev. D 110, 023537 (2024)
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-dominated era. By solving the equations of motion of linear scalar pertur
Externí odkaz:
http://arxiv.org/abs/2404.02922
Publikováno v:
Sci. China-Phys. Mech. Astron. 66, 120404 (2023)
The power-law parametrization for the energy density spectrum of gravitational wave (GW) background is a useful tool to study its physics and origin. While scalar induced secondary gravitational waves (SIGWs) from some particular models fit the signa
Externí odkaz:
http://arxiv.org/abs/2307.02467
Publikováno v:
Physical Review D,2023
Gravitational waves (GWs) are useful to test gravitational theories and to probe the physics in the early universe. In this paper, we investigate the scalar induced gravitational waves (SIGWs) in symmetric teleparallel gravity with a parity-violating
Externí odkaz:
http://arxiv.org/abs/2307.00330
We investigate the scalar induced gravitational waves (SIGWs) in the Chern-Simons (CS) gravity with a dynamical scalar field during slow roll inflation. Due to the parity violation in the CS term, the SIGWs are generally polarized, which are effectiv
Externí odkaz:
http://arxiv.org/abs/2302.00950
Publikováno v:
JCAP 10(2022)054
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
Externí odkaz:
http://arxiv.org/abs/2205.12045
Autor:
Zhang, Fengge
Publikováno v:
Physical Review D 105, 063539 (2022)
We study an inflationary $E$ model with the Gauss-Bonnet coupling, which can enhance the curvature perturbation at small scales and thus produce a significant abundance of primordial black holes (PBHs) and detectable scalar induced gravitational wave
Externí odkaz:
http://arxiv.org/abs/2112.10516
We resolve the potential-restriction problem in K/G inflation by introducing nonminimal coupling. In this context, Higgs field successfully drives inflation satisfying CMB observations while enhancing curvature perturbations at small scales, which in
Externí odkaz:
http://arxiv.org/abs/2111.01362
Publikováno v:
Phys. Rev. D 104, 063515 (2021)
A significant abundance of primordial black hole (PBH) dark matter can be produced by curvature perturbations with power spectrum $\Delta_\zeta^2(k_{\mathrm{peak}})\sim \mathcal{O}(10^{-2})$ at small scales, associated with the generation of observab
Externí odkaz:
http://arxiv.org/abs/2106.10792