Zobrazeno 1 - 10
of 24
pro vyhledávání: '"Toda, Yo"'
It has recently been argued that the Hubble tension may call for a combination of both pre- and post-recombination new physics. Motivated by these considerations, we provide one of the first concrete case studies aimed at constructing such a viable c
Externí odkaz:
http://arxiv.org/abs/2407.01173
Autor:
Seto, Osamu, Toda, Yo
Baryon acoustic oscillation (BAO) is one of the important standard ruler in cosmology. The results of the latest BAO measurements by Dark Energy Spectroscopic Instrument (DESI) survey has been reported. Cosmology with the varying electron mass model
Externí odkaz:
http://arxiv.org/abs/2405.11869
We investigate cosmological bounds on sterile neutrino masses in the light of the Hubble and $S_8$ tensions. We argue that non-zero masses for sterile neutrinos are inferred at 2$\sigma$ level in some extended models such as varying dark energy equat
Externí odkaz:
http://arxiv.org/abs/2312.15435
Autor:
Takahashi, Tomo, Toda, Yo
We investigate the impact of big bang nucleosynthesis (BBN) on the Hubble tension, focusing on how the treatment of the reaction rate and observational data affect the evaluation of the tension. We show that the significance of the tension can vary b
Externí odkaz:
http://arxiv.org/abs/2306.00454
We point out that the recent result of primordial helium-4 ($^4$He) abundance measurement by EMPRESS, which has reported a smaller $^4$He abundance than other measurements, can be well fitted by assuming a time-variation of the fine structure constan
Externí odkaz:
http://arxiv.org/abs/2305.16624
Autor:
Seto, Osamu, Toda, Yo
A cosmological model with a time-varying mass of electrons seems a promising solution for the so-called Hubble tension. We examine the big bang nucleosynthesis (BBN) constraints on the time-varying electron mass model, because a larger electron mass
Externí odkaz:
http://arxiv.org/abs/2206.13209
Autor:
Hoshiya, Kouki, Toda, Yo
We investigate the model where electrons and dark matter interact with dark energy through the rolling of a scalar field which comes from extra dimensional theories such as the braneworld theory and Brans-Dicke theory. In this model, dark energy coup
Externí odkaz:
http://arxiv.org/abs/2202.07714
Autor:
Seto, Osamu, Toda, Yo
Publikováno v:
Phys. Rev. D 104, 063019 (2021)
We study the fit of cosmological models with two additional free parameters $N_\mathrm{eff}$ and $\xi_e$ in addition to the parameters of $\Lambda$CDM. We introduce extra radiation components such as hot axions or sterile neutrinos in addition to the
Externí odkaz:
http://arxiv.org/abs/2104.04381
Autor:
Seto, Osamu, Toda, Yo
Publikováno v:
Phys. Rev. D 103, 123501 (2021)
The shorten sound horizon scale at the recombination epoch by introducing extra energy components such as the extra radiation or early dark energy (EDE) is a simple approach to so-called the Hubble tension. We compare EDE models, an extra radiation m
Externí odkaz:
http://arxiv.org/abs/2101.03740
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