Pantheon SEMPARIS Le serveur des séminaires parisiens Paris

Status Confirmed
Seminar Series LPTHE-PPH
Subjects hep-ph
Date Friday 6 September 2019
Time 14:00
Institute LPTHE
Seminar Room library
Speaker's Last Name Nagata
Speaker's First Name Natsumi
Speaker's Email Address
Speaker's Institution Tokyo U.
Title On the WIMP dark matter signature in old neutron stars
Abstract Weakly Interacting Massive Particles (WIMPs) in the Universe accumulate in neutron stars (NSs) through their interactions with ordinary matter, and their annihilation inside the NS core causes late-time heating. It has been argued that this heating effect maintains the surface temperature of old NSs to be a few thousand K, which can be regarded as a smoking gun signature of dark matter (DM) heating in NSs. This conclusion is, however, drawn based on the assumption that the beta equilibrium is sustained in NSs throughout their life, which turns out to be invalid for real pulsars. If a NS is out of beta equilibrium, then there is another heating effect due to the dissipation of the excessive energy stored in the imbalance in the chemical potentials, which may conceal the DM heating effect. In fact, such an “out-of-equilibrium heating” effect is favored by recent observations. In this talk, we show that the signature of DM heating can still be detected in old ordinary pulsars even in the presence of the out-of-beta-equilibrium effect, whereas it is hidden in millisecond pulsars. We also discuss that an observation of a NS with the surface temperature lower than a thousand K imposes a stringent limit on a variety of WIMP DM candidates, such as the electroweak multiplet DM particles.
arXiv Preprint Number

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