Zobrazeno 1 - 10
of 44
pro vyhledávání: '"Akita, Kensuke"'
e investigate the cosmological impact of hypothetical unstable new physics particles that decay in the MeV-scale plasma of the Early Universe. Focusing on scenarios where the decays produce metastable species such as muons, pions, and kaons, we syste
Externí odkaz:
http://arxiv.org/abs/2411.00931
We investigate decays of hypothetical unstable new physics particles into metastable species such as muons, pions, or kaons in the early Universe, when temperatures are in the MeV range, and study how they affect cosmic neutrinos. We demonstrate that
Externí odkaz:
http://arxiv.org/abs/2411.00892
Light hypothetical particles with masses up to $\mathcal{O}(100)\ {\rm MeV}$ can be produced in the core of supernovae. Their subsequent decays to neutrinos can produce a flux component with higher energies than the standard flux. We study the impact
Externí odkaz:
http://arxiv.org/abs/2312.13627
Autor:
Akita, Kensuke, Ando, Shin'ichiro
The elastic scattering between dark matter (DM) and radiation can potentially explain small-scale observations that the cold dark matter faces as a challenge, as damping density fluctuations via dark acoustic oscillations in the early universe erases
Externí odkaz:
http://arxiv.org/abs/2305.01913
Autor:
Akita, Kensuke, Niibo, Michiru
Majorons are (pseudo-)Nambu-Goldstone bosons associated with lepton number symmetry breaking due to the Majorana mass term of neutrinos introduced in the seesaw mechanism. They are good dark matter candidates since their lifetime is suppressed by the
Externí odkaz:
http://arxiv.org/abs/2304.04430
Autor:
Akita, Kensuke, Yamaguchi, Masahide
Publikováno v:
Universe 2022, 8(11), 552
We review the distortions of spectra of relic neutrinos due to the interactions with electrons, positrons, and neutrinos in the early universe. We solve integro-differential kinetic equations for the neutrino density matrix, including vacuum three-fl
Externí odkaz:
http://arxiv.org/abs/2210.10307
Non-standard neutrino interactions with a massive boson can produce the bosons in the core of core-collapse supernovae (SNe). After the emission of the bosons from the SN core, their subsequent decays into neutrinos can modify the SN neutrino flux. W
Externí odkaz:
http://arxiv.org/abs/2206.06852
We discuss the discovery potential of JUNO experiment for neutrino lines from MeV dark matter (DM) annihilation and decay in a model independent way. We find that JUNO will be able to give severe constraints on the cross section of DM annihilating in
Externí odkaz:
http://arxiv.org/abs/2206.06755
Future direct observations of the Cosmic Neutrino Background (C$\nu$B) have the potential to explore a neutrino lifetime, especially in the region of the age of the universe, $t_0=4.35\times 10^{17}\ {\rm s}$. We forecast constraints on neutrino deca
Externí odkaz:
http://arxiv.org/abs/2109.02900
We explore the potential of measurements of cosmological effects, such as neutrino spectral distortions from the neutrino decoupling and neutrino clustering in our Galaxy, via cosmic neutrino capture on tritium. We compute the precise capture rates o
Externí odkaz:
http://arxiv.org/abs/2010.04454