Browsing by Author "Chen, Chian-Shu"

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Complementary test of the dark matter self-interaction in dark U(1) model by direct and indirect dark matter detection
(2016-01-01)
Chen, Chian-Shu
;
Lin, Guey-Lin
;
Lin, Yen-Hsun
;
物理研究所
;
Institute of Physics
The halo dark matter (DM) can be captured by the Sun if its final velocity after the collision with a nucleus in the Sun is less than the escape velocity. We consider a selfinteracting dark matter (SIDM) model where U(1) gauge symmetry is introduced to account for the DM self-interaction. Such a model naturally leads to isospin violating DM nucleon interaction, although isospin symmetric interaction is still allowed as a special case. We present the IceCube-PINGU 2a sensitivity to the parameter range of the above model with 5 years of search for neutrino signature from DM annihilation in the Sun. This indirect detection complements the direct detection by probing those SIDM parameter ranges which are either the region for very small rnx or the region opened up due to isospin violations.
Complementary Test of the Dark Matter Self-Interaction in Dark U(1) Model by Direct and Indirect Detection
(2016-01-01)
Chen, Chian-Shu
;
Lin, Yen-Hsun
;
Lin, Guey-Lin
;
物理研究所
;
Institute of Physics
The halo dark matter (DM) can be captured by the Sun if its final velocity after the collision with a nucleus in the Sun is less than the escape velocity. We consider a selfinteracting dark matter (SIDM) model where U(1) gauge symmetry is introduced to account for the DM self-interaction. Such a model naturally leads to isospin violating DM- nucleon interaction, although isospin symmetric interaction is still allowed as a special case. We present the IceCube-PINGU 2 sigma sensitivity to the parameter range of the above model with 5 years of search for neutrino signature from DM annihilation in the Sun. This indirect detection complements the direct detection by probing those SIDM parameter ranges which are either the region for very small m(chi) or the region opened up due to isospin violations.
Probing dark matter self-interaction in the Sun with IceCube-PINGU
(2014-10-01)
Chen, Chian-Shu
;
Lee, Fei-Fan
;
Lin, Guey-Lin
;
Lin, Yen-Hsun
;
物理研究所
We study the capture, annihilation and evaporation of dark matter (DM) inside the Sun. It has been shown that the DM self-interaction can increase the DM number inside the Sun. We demonstrate that this enhancement becomes more significant in the regime of small DM mass, given a fixed DM self-interaction cross section. This leads to the enhancement of neutrino flux from DM annihilation. On the other hand, for DM mass as low as as a few GeVs, not only the DM-nuclei scatterings can cause the DM evaporation, DM self-interaction also provides non-negligible contributions to this effect. Consequently, the critical mass for DM evaporation (typically 3 similar to 4 GeV without the DM self-interaction) can be slightly increased. We discuss the prospect of detecting DM self-interaction in IceCube-PINGU using the annihilation channels chi chi -> tau(+)tau(-), nu(nu) over bar as examples. The PINGU sensitivities to DM self-interaction cross section sigma(chi chi) are estimated for track and cascade events.
The 17 MeV anomaly in beryllium decays and U(1) portal to dark matter
(2017-11-10)
Chen, Chian-Shu
;
Lin, Guey-Lin
;
Lin, Yen-Hsun
;
Xu, Fanrong
;
物理研究所
The experiment of Krasznahorkay et al. observed the transition of a Be-8 excited state to its ground state and accompanied by an emission of an e(+) e(-) pair with 17 MeV invariant mass. This 6.8 sigma anomaly can be fitted by a new light gauge boson. We consider the new particle as a U(1) gauge boson, Z', which plays as a portal linking dark sector and visible sector. In particular, we study the new U(1) gauge symmetry as a hidden or nonhidden group separately. The generic hidden U(1) model, referred to as dark Z model, is excluded by imposing various experimental constraints. On the other hand, a nonhidden Z' is allowed due to the additional interactions between Z' and Standard Model fermions. We also study the implication of the dark matter direct search on such a scenario. We found that the search for the DM-nucleon scattering cannot probe the parameter space that is allowed by Be-8-anomaly for the range of DM mass above 500 MeV. However, the DM-electron scattering for DM between 20 MeV and 50 MeV can test the underlying U(1) portal model using the future Si and Ge detectors with the 5e(-) threshold charges.
The Dark Matter Self-Interaction and Its Impact on the Critical Mass for Dark Matter Evaporations Inside the Sun
(2016-04-06)
Chen, Chian-Shu
;
Lee, Fei-Fan
;
Lin, Guey-Lin
;
Lin, Yen-Hsun
;
物理研究所
We study the capture, annihilation and evaporation of dark matter (DM) inside the Sun. It has been shown that the DM self-interaction can increase the DM number inside the Sun. We demonstrate that this enhancement becomes more significant in the regime of small DM mass, given a fixed DM self-interaction cross section. This leads to the enhancement of neutrino flux from DM annihilation. On the other hand, for DM mass as low as as a few GeVs, not only the DM-nuclei scatterings can cause the DM evaporation, DM self-interaction also provides non-negligible contributions to this effect. Consequently, the critical mass for DM evaporation (typically 3 similar to 4 GeV without the DM self-interaction) can be slightly increased. We discuss the prospect of detecting DM self-interaction in IceCube-PINGU using the annihilation channels chi chi -> tau(+)tau(-), nu(nu) over bar as examples. The PINGU sensitivities to DM self-interaction cross section sigma(chi chi) are estimated for track and cascade events.
The Dark Matter Self-Interaction and Its Impact on the Critical Mass for Dark Matter Evaporations Inside the Sun
(2016-04-01)
Chen, Chian-Shu
;
Lee, Fei-Fan
;
Lin, Guey-Lin
;
Lin, Yen-Hsun
;
物理研究所
We study the capture, annihilation and evaporation of dark matter (DM) inside the Sun. It has been shown that the DM self-interaction can increase the DM number inside the Sun. We demonstrate that this enhancement becomes more significant in the regime of small DM mass, given a fixed DM self-interaction cross section. This leads to the enhancement of neutrino flux from DM annihilation. On the other hand, for DM mass as low as as a few GeVs, not only the DM-nuclei scatterings can cause the DM evaporation, DM self-interaction also provides non-negligible contributions to this effect. Consequently, the critical mass for DM evaporation (typically 3 similar to 4 GeV without the DM self-interaction) can be slightly increased. We discuss the prospect of detecting DM self-interaction in IceCube-PINGU using the annihilation channels chi chi -> tau(+)tau(-), nu(nu) over bar as examples. The PINGU sensitivities to DM self-interaction cross section sigma(chi chi) are estimated for track and cascade events.
Thermal transport of the solar captured dark matter and its impact on the indirect dark matter search
(2016-12)
Chen, Chian-Shu
;
Lin, Guey-Lin
;
Lin, Yen-Hsun
;
物理研究所
;
Institute of Physics
We study the thermal transport occurring in the system of solar captured dark matter (DM) and explore its impact on the DM indirect search signal. We particularly focus on the scenario of self-interacting DM (SIDM). The flows of energies in and out of the system are caused by solar captures via DM-nucleon and DM-DM scatterings, the energy dissipation via DM annihilation, and the heat exchange between DM and solar nuclei. We examine the DM temperature evolution and demonstrate that the DM temperature can be higher than the core temperature of the Sun if the DM-nucleon cross section is sufficiently small such that the energy flow due to DM self-interaction becomes relatively important. We argue that the correct DM temperature should be used for accurately predicting the DM annihilation rate, which is relevant to the DM indirect detection. (C) 2016 Elsevier B.V.All rights reserved.
Thermal transport of the solar captured dark matter and its impact on the indirect dark matter search
(2016-12)
Chen, Chian-Shu
;
Lin, Guey-Lin
;
Lin, Yen-Hsun
;
物理研究所
;
Institute of Physics
We study the thermal transport occurring in the system of solar captured dark matter (DM) and explore its impact on the DM indirect search signal. We particularly focus on the scenario of self-interacting DM (SIDM). The flows of energies in and out of the system are caused by solar captures via DM-nucleon and DM-DM scatterings, the energy dissipation via DM annihilation, and the heat exchange between DM and solar nuclei. We examine the DM temperature evolution and demonstrate that the DM temperature can be higher than the core temperature of the Sun if the DM-nucleon cross section is sufficiently small such that the energy flow due to DM self-interaction becomes relatively important. We argue that the correct DM temperature should be used for accurately predicting the DM annihilation rate, which is relevant to the DM indirect detection. (C) 2016 Elsevier B.V.All rights reserved.
Thermal transport of the solar captured dark matter and its implication
(2016-01-01)
Lin, Yen-Hsun
;
Chen, Chian-Shu
;
Lin, Guey-Lin
;
物理研究所
;
Institute of Physics
We study the thermal transport occurring in the system of solar captured dark matter (DM) and explore its impact on the DM indirect search signal. We particularly focus on the scenario of self-interacting DM (SIDM). The flows of energies in and out of the system are caused by solar captures via DM-nucleon and DM-DM scatterings, the energy dissipation via DM annihilation, and the heat exchange between DM and solar nuclei.We examine the DM temperature evolution and demonstrate that the DM temperature can be higher than the core temperature of the Sun if the DM-nucleon cross section is sufficiently small such that the energy flow due to DM self-interaction becomes relatively important. We argue that the correct DM temperature should be used for accurately predicting the DM annihilation rate, which is relevant to the DM indirect detection.