Zobrazeno 1 - 10
of 1 541
pro vyhledávání: '"TANAKA, TAKAHIRO"'
Autor:
Kakehi, Takafumi, Tanaka, Takahiro
The Hamiltonian formulation with action-angle variables is very useful when considering the motion of particles undergoing a self-force reaction due to gravitational wave emission. Using the proper time as a parameter along the trajectory is consider
Externí odkaz:
http://arxiv.org/abs/2410.22858
Autor:
Tanaka, Takahiro, Urakawa, Yuko
The $\delta N$ formalism has been the major computational tool to study the superhorizon evolution of the scalar type perturbation sourced by scalar fields. Recently, this formalism was generalized to compute an arbitrary scalar, vector, and tensor t
Externí odkaz:
http://arxiv.org/abs/2408.13673
The $\delta N$ formalism is a powerful approach to compute non-linearly the large-scale evolution of the comoving curvature perturbation $\zeta$. It assumes a set of FLRW patches that evolve independently, but in doing so, all the gradient terms are
Externí odkaz:
http://arxiv.org/abs/2408.09964
Superradiant instability can form clouds around rotating black holes (BHs) composed of ultralight bosonic fields, such as axions. A BH with such a cloud in a binary system exhibits rich phenomena, and gravitational waves (GWs) from the BH merger prov
Externí odkaz:
http://arxiv.org/abs/2408.08349
Autor:
Tanaka, Takahiro, Nakayama, Yu
Based on the study of non-invertible symmetries, we propose there exist infinitely many new renormalization group flows between Virasoro minimal models $\mathcal{M}(kq + I, q) \to\mathcal{M}(kq-I, q)$ induced by $\phi_{(1,2k+1)}$. They vastly general
Externí odkaz:
http://arxiv.org/abs/2407.21353
Gravitational waves from condensates of ultra-light particles, such as axion, around rotating black holes are a promising probe to search for unknown physics. For this purpose, we need to characterize the signal to detect the gravitational waves, whi
Externí odkaz:
http://arxiv.org/abs/2404.16265
Autor:
Takeda, Hiroki, Tanaka, Takahiro
We explore the impact of corrections to the propagation on the waveforms of gravitationally lensed gravitational waves under the geometrical optics approximation, focusing on both uniform cosmological modifications and local modifications localized a
Externí odkaz:
http://arxiv.org/abs/2404.10809
Autor:
Tanaka, Takahiro, Urakawa, Yuko
In this letter, we demonstrate how to use the generalized $\delta N$ formalism, which enables us to compute the evolution of all the large scale fluctuations, including gravitational waves, solely by solving the evolution of the background homogeneou
Externí odkaz:
http://arxiv.org/abs/2309.08497
Autor:
Miura, Taishi, Tanaka, Takahiro
The Hubble constant is one of the most important parameters in cosmology. Discrepancies in values of the Hubble constant estimated from various measurements, the so-called Hubble tension, are a serious problem. In this paper, we study the effects of
Externí odkaz:
http://arxiv.org/abs/2309.02288
Autor:
Uchikata, Nami, Narikawa, Tatsuya, Nakano, Hiroyuki, Sago, Norichika, Tagoshi, Hideyuki, Tanaka, Takahiro
Gravitational wave echo signals have been proposed as evidence for the modification of the spacetime structure near the classical event horizon. These signals are expected to occur after the mergers of compact binaries as a sequence of weak pulse-lik
Externí odkaz:
http://arxiv.org/abs/2309.01894