Zobrazeno 1 - 10
of 113
pro vyhledávání: '"Fu, Chengjie"'
Autor:
Qin, Ying, Wang, Zhen-Han-Tao, Meynet, Georges, Hu, Rui-Chong, Fu, Chengjie, Shu, Xin-Wen, Wang, Zi-Yuan, Yi, Shuang-Xi, Tang, Qing-Wen, Song, Han-Feng, Liang, En-Wei
During the fourth observing run, the LIGO-Virgo-KAGRA Collaboration reported the detection of a coalescing compact binary (GW230529$_{-}$181500) with component masses estimated at $2.5-4.5\, M_\odot$ and $1.2-2.0\, M_\odot$ with 90\% credibility. Giv
Externí odkaz:
http://arxiv.org/abs/2409.14476
An axion-like spectator during inflation can trigger a tachyonic instability which amplifies the modes of one of the helicities of the gauge field, resulting in the production of parity-violating gravitational waves (GWs). In this paper we investigat
Externí odkaz:
http://arxiv.org/abs/2409.08312
Autor:
Fu, Chengjie, Wang, Shao-Jiang
Publikováno v:
Phys. Rev. D 109 (2024) L041304
Recent attempts to fully resolve the Hubble tension from early dark energy models seem to favor a primordial Harrison-Zeldovich universe with its scalar spectrum being extremely scale invariant. Restoring the Harrison-Zeldovich spectrum within the si
Externí odkaz:
http://arxiv.org/abs/2310.12932
The pulsar timing array (PTA) collaborations have recently suggested the presence of a gravitational wave background at nano-Hertz frequencies. In this paper, we explore potential inflationary interpretation of this signal within the context of a sim
Externí odkaz:
http://arxiv.org/abs/2308.15329
Publikováno v:
Phys. Rev. D 108, 123509 (2023)
We study the inflationary model with a spectator scalar field $\chi$ coupled to both the inflaton and Ricci scalar. The interaction between the $\chi$ field and the gravity, denoted by $\xi R\chi^2$, can trigger the tachyonic instability of certain m
Externí odkaz:
http://arxiv.org/abs/2307.03120
Autor:
Fu, Chengjie, Chen, Chao
We investigate the amplification of curvature perturbations in a two-field inflation model featuring a Gaussian potential bump. When the inflaton encounters a potential bump along the inflationary trajectory, its rolling speed is generally reduced, p
Externí odkaz:
http://arxiv.org/abs/2211.11387
Autor:
Fu, Chengjie, Wang, Shao-Jiang
Publikováno v:
JCAP 06 (2023) 012
The primordial black hole (PBH) productions from the inflationary potential with an inflection point usually rely heavily on the fine-tuning of the model parameters. We propose in this work a new kind of the $\alpha$-attractor inflation with asymmetr
Externí odkaz:
http://arxiv.org/abs/2211.03523
Publikováno v:
Phys. Rev. D 106, 124044 (2022)
We investigate gravitational waves (GWs) generated in a two-field inflationary model with a non-canonical kinetic term, in which the gravitational Chern-Simons term is coupled to a heavy dynamical field. In such a model, primordial GWs experience a p
Externí odkaz:
http://arxiv.org/abs/2209.10374
We study the inflationary implications of a novel parity-violating gravity model, which modifies the teleparallel equivalent of general relativity by introducing the Nieh-Yan term coupled to an axion-like field. The parity-violating Nieh-Yan term res
Externí odkaz:
http://arxiv.org/abs/2112.04794
Publikováno v:
Phys. Rev. D 104, 083537 (2021)
We investigate the enhancement of the curvature perturbations in a single-field slow-roll inflation with a spectator scalar field kinetically coupled to the inflaton. The coupling term with a periodic function of inflaton triggers the exponential gro
Externí odkaz:
http://arxiv.org/abs/2108.03422