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- W3200968411 abstract "Using neutron stars (NS) as a dark matter (DM) probe has gained broad attention recently, either from heating due to DM annihilation or its stability under the presence of DM. In this work, we investigate spin-$1/2$ fermionic DM $chi$ charged under the $U(1)_{X}$ in the dark sector. The massive gauge boson $V$ of $U(1)_{X}$ gauge group can be produced in NS via DM annihilation. The produced gauge boson can decay into Standard Model (SM) particles before it exits the NS, despite its tiny couplings to SM particles. Thus, we perform a systematic study on $chibar{chi}to2Vto4{rm SM}$ as a new heating mechanism for NS in addition to $chibar{chi}to2{rm SM}$ and kinetic heating from DM-baryon scattering. The self-trapping due to $chi V$ scattering is also considered. We assume the general framework that both kinetic and mass mixing terms between $V$ and SM gauge bosons are present. This allows both vector and axial-vector couplings between $V$ and SM fermions even for $m_Vll m_Z$. Notably, the contribution from axial-vector coupling is not negligible when particles scatter relativistically. We point out that the above approaches to DM-induced NS heating are not yet adopted in recent analyses. Detectabilities of the aforementioned effects to the NS surface temperature by the future telescopes are discussed as well." @default.
- W3200968411 created "2021-09-27" @default.
- W3200968411 creator A5042769883 @default.
- W3200968411 creator A5064222429 @default.
- W3200968411 date "2021-09-15" @default.
- W3200968411 modified "2023-10-18" @default.
- W3200968411 title "Exploring dark sector parameters in light of neutron star temperatures" @default.
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- W3200968411 doi "https://doi.org/10.1103/physrevd.104.063021" @default.
- W3200968411 hasPublicationYear "2021" @default.
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