Zobrazeno 1 - 10
of 842
pro vyhledávání: '"Cai, Rong-Gen"'
We investigate the evolution of cosmological scalar perturbations in the case that the background radiation is weakly coupled to a light scalar field $\phi$. The light scalar $\phi$ is a homogeneous background field with a large initial value. In the
Externí odkaz:
http://arxiv.org/abs/2407.04220
By leveraging neural networks, we address the inverse problem of constructing a quantitative 2+1-flavor holographic QCD model based on state-of-the-art lattice QCD data. Our model demonstrates quantitative agreement with the latest lattice QCD result
Externí odkaz:
http://arxiv.org/abs/2406.12772
Primordial black holes (PBHs) may form before cosmological first-order phase transitions, leading to inevitable collisions between PBHs and bubble walls. In this Letter, we have simulated for the first time the co-evolution of an expanding scalar wal
Externí odkaz:
http://arxiv.org/abs/2406.05838
First-order primordial curvature perturbations are known to induce gravitational waves at the second-order, which can in turn probe the small-scale curvature perturbations near the end of the inflation. In this work, we extend the previous analysis i
Externí odkaz:
http://arxiv.org/abs/2406.05034
Publikováno v:
Sci. China Phys. Mech. Astron. 67, 290411 (2024)
Recently, much attention has been focused on the false vacuum islands that are flooded by an expanding ocean of true-vacuum bubbles slightly later than most of the other parts of the world. These delayed decay regions will accumulate locally larger v
Externí odkaz:
http://arxiv.org/abs/2404.06506
The pulsar timings are sensitive to both the nanohertz gravitational-wave background and the oscillation of ultralight dark matter. The Hellings-Downs angular correlation curve provides a criterion to search for stochastic gravitational-wave backgrou
Externí odkaz:
http://arxiv.org/abs/2402.03984
Publikováno v:
Phys. Rev. D 109, 084049 (2024)
We first show that the master equations for massless perturbations of accelerating rotating black holes can be transformed into the Heun's equation. The quasinormal modes of the black holes can be easily calculated in the framework of the Heun's equa
Externí odkaz:
http://arxiv.org/abs/2402.02027
Recent detections of a low-frequency gravitational wave background (GWB) from various pulsar-timing-array (PTA) observations have renewed the interest in the inspiraling supermassive black hole binaries (SMBHBs), whose population is believed to be th
Externí odkaz:
http://arxiv.org/abs/2312.14041
Publikováno v:
JHEP 02(2024)169
The study of the interior of hairy black holes has received significant attention recently. This paper builds upon our recent analytical approach to investigate the internal dynamics of charged black holes with scalar hair in general spacetime dimens
Externí odkaz:
http://arxiv.org/abs/2312.11131
We examine gravitational waves (GWs) emitted from axionic strings and domain walls (DWs) in the early universe using advanced 3D lattice simulations. Our study encompasses scenarios for domain wall numbers $N_{\rm DW}=1$ and $N_{\rm DW}>1$, which cor
Externí odkaz:
http://arxiv.org/abs/2311.02011