Zobrazeno 1 - 10
of 158
pro vyhledávání: '"Puxun Wu"'
Publikováno v:
Physics Letters B, Vol 849, Iss , Pp 138457- (2024)
In this paper, we introduce a weak, transient and periodical derivative coupling between the inflaton field and gravity, and find that the square of the sound speed of the curvature perturbations becomes a periodic function, which results in that the
Externí odkaz:
https://doaj.org/article/f0d10a26e55745c6b218aed59bb5de0c
Publikováno v:
The Astrophysical Journal, Vol 962, Iss 2, p 103 (2024)
We compare, with data from quasars, Hubble parameter measurements, and Pantheon+ type Ia supernova, three different relations between X-ray luminosity ( L _X ) and ultraviolet luminosity ( L _UV ) of quasars. These three relations consist of the stan
Externí odkaz:
https://doaj.org/article/f0d3b7fc408a402bbb1d4535fe275c5b
Publikováno v:
The Astrophysical Journal Letters, Vol 946, Iss 2, p L49 (2023)
We establish a cosmological-model-independent method to determine the Hubble constant H _0 from the localized fast radio bursts (FRBs) and the Hubble parameter measurements from cosmic chronometers and obtain a first such determination H _0 = 71 ± 3
Externí odkaz:
https://doaj.org/article/f1d4e57148cd4ae4aa4198dce97e7ca8
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 81, Iss 3, Pp 1-7 (2021)
Abstract We investigate axion inflation where the gravitational Chern–Simons term is coupled to a periodic function of the inflaton. We find that tensor perturbations with different polarizations are amplified in different ways by the Chern–Simon
Externí odkaz:
https://doaj.org/article/cc0518cd62244af0a2756b6035151e14
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 80, Iss 8, Pp 1-6 (2020)
Abstract We investigate the resonance quadrupole-quadrupole interaction between two entangled gravitationally polarizable objects induced by a bath of fluctuating quantum gravitational fields in vacuum in the framework of linearized quantum gravity.
Externí odkaz:
https://doaj.org/article/a3e5640a5d1d4e2f895dd020f9bad4c7
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 80, Iss 6, Pp 1-8 (2020)
Abstract The production of GWs during preheating in the Starobinsky model with a nonminimally coupled auxiliary scalar field is studied through the lattice simulation in this paper. We find that the GW spectrum $$\Omega _{\mathrm{gw}}$$ Ωgw grows fa
Externí odkaz:
https://doaj.org/article/80b5e9bc91e34873a4bfbce398983cd9
Publikováno v:
Nuclear Physics B, Vol 975, Iss , Pp 115665- (2022)
In this paper, we adopt the so-called Buonanno-Kidder-Lehner (BKL) recipe to estimate the final spin of a rotating binary black hole merger in STU supergravity. According to the BKL recipe, the final spin can be viewed as the sum of the individual sp
Externí odkaz:
https://doaj.org/article/dccfed81718240e883d7bfbe41e4f801
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 78, Iss 1, Pp 1-9 (2018)
Abstract The emergent mechanism provides a possible way to resolve the big-bang singularity problem by assuming that our universe originates from the Einstein static (ES) state. Thus, the existence of a stable ES solution becomes a very crucial prere
Externí odkaz:
https://doaj.org/article/fcf827a9ca144355873ced395149a1d4
Publikováno v:
Physics Letters B, Vol 763, Iss , Pp 40-44 (2016)
When gravity is quantized, there inevitably exist quantum gravitational vacuum fluctuations which induce quadrupole moments in gravitationally polarizable objects and produce a quantum correction to the classical Newtonian interaction between them. H
Externí odkaz:
https://doaj.org/article/6f0636ffb3324da088805ba34b34ecc1
Publikováno v:
Physics Letters B, Vol 758, Iss C, Pp 37-41 (2016)
With the assumption that a perfect fluid with a constant equation of state is the only energy component on the brane, we study the stability of Einstein static state solution under homogeneous and inhomogeneous scalar perturbations in both spatially
Externí odkaz:
https://doaj.org/article/d93a2faf0a3d44a7819c7745981bdce9