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pro vyhledávání: '"Lue H"'
In June 2023, multiple pulsar timing array collaborations provided evidence for the existence of a stochastic gravitational wave background. Scalar induced gravitational waves (SIGWs), as one of the most likely sources of stochastic gravitational wav
Externí odkaz:
http://arxiv.org/abs/2410.10111
We investigate the first and second order cosmological perturbation equations in f(R) modified gravity theory and provide the equation of motion of second order scalar induced gravitational waves. We find that the effects of modified gravity not only
Externí odkaz:
http://arxiv.org/abs/2409.07702
Gravitational waves induced by primordial perturbations serve as crucial probes for studying the early universe, providing a significant window into potential new physics during cosmic evolution. Due to the potentially large amplitudes of primordial
Externí odkaz:
http://arxiv.org/abs/2408.14052
We introduce an ingenious approach to explore cosmological implications of higher-derivative gravity theories. The key novelty lies in the characterization of the additional massive spin-0 modes constructed from Hubble derivatives as an effective den
Externí odkaz:
http://arxiv.org/abs/2405.02879
Observational Feasibility of 4D Einstein-Gauss-Bonnet Cosmology: Bouncing and Non-Bouncing Universes
Publikováno v:
JCAP 05 (2024) 024
This paper analyzes the possibility of bouncing and non-bouncing universes in the framework of four-dimensional Einstein-Gauss-Bonnet (4D-EGB) gravity, corresponding respectively to negative and positive coupling constants $\lambda$ of the Gauss-Bonn
Externí odkaz:
http://arxiv.org/abs/2401.11732
It is commonly believed that black holes are the smallest self-gravitating objects of the same mass in the Universe. Here, we demonstrate, in a subclass of higher-order pure gravities known as quasi-topological gravity, that by modifying general rela
Externí odkaz:
http://arxiv.org/abs/2312.01406
Publikováno v:
JCAP06(2024)002
We investigate various cosmological aspects of a 4-Dimensional Gauss-Bonnet Lagrangian, which is integrated into the Einstein Lagrangian with an arbitrary sign, using the Friedman-Lema\^itre-Robertson-Walker (FLRW) metric. We consider a general poten
Externí odkaz:
http://arxiv.org/abs/2311.15272
Publikováno v:
Symmetry 2023, 15(8), 1579
We study the holographic dual of the two dimensional non-relativistic conformal field theory with anisotropic scaling from a symmetry perspective. We construct a new four dimensional metric with two dimensional global anisotropic scaling isometry. Th
Externí odkaz:
http://arxiv.org/abs/2306.16776
It was recently shown that the extremal charged black holes in STU supergravity suffer from superradiant instability owing to the existence of the unstable (low-frequency) quasibound states associated with a charged massive scalar field. In this pape
Externí odkaz:
http://arxiv.org/abs/2201.11138
Publikováno v:
JHEP01(2022)157
We construct non-extremal dyonic string solutions in 6D minimal supergravity where the leading higher derivative corrections arise from either the type IIA string theory compactified on K3 or the heterotic string theory compactified on 4-torus. The t
Externí odkaz:
http://arxiv.org/abs/2110.03129