Dark matter self-interactions in the matter power spectrum

Garani, Raghuveer; Redi, Michele; Tesi, Andrea

doi:10.1088/1475-7516/2022/07/012

Cited by 5 publications

(3 citation statements)

References 53 publications

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“…Finally note, that in the parameter space of interest, the DM is always chemically decoupled following the PT, i.e. the annhilation rate X + X → φ + φ is also below H. Elastic selfinteractions between the DM can reduce the m WDM constraint by ∼ 20% [48,49], however, because of the super-heavy nature of our DM, its non-gravitational self-interactions are also completely negligible.…”

Section: Non-cold Heavy Dmmentioning

confidence: 98%

Hot and heavy dark matter from a weak scale phase transition

2023

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We point out that dark matter which is produced non-adiabatically in a phase transition (PT) with fast bubble walls receives a boost in velocity which leads to long free-streaming lengths. We find that this could be observed via the suppressed matter power spectrum for dark matter masses around \mathbf{ 10^8 - 10^9}108-109 GeV and energy scales of the PT around \mathbf{ 10^{2} - 10^3}102-103 GeV. The PT should take place at the border of the supercooled regime, i.e. approximately when the Universe becomes vacuum dominated. This work offers novel physics goals for galaxy surveys, Lyman-\alphaɑ, stellar stream, lensing, and 21-cm observations, and connects these to the gravitational waves from such phase transitions, and more speculatively to possible telescope signals of heavy dark matter decay.

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Section: Non-cold Heavy Dmmentioning

confidence: 98%

Hot and heavy dark matter from a weak scale phase transition

2023

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“…The potential deviation from the CDM predictions on these scales may reveal properties of dark matter which include but are not limited to its self interaction in self-interacting dark-matter models (for example, see refs. [15,[18][19][20][21][22][23][24] and references therein), its de Broglie wavelength or mass in ultralight dark-matter models (see, e.g., refs. [25][26][27][28][29][30]), its late-decay lifetime [31][32][33][34][35][36][37][38][39][40][41][42][43][44][45][46][47], and the free-streaming scale from non-negligible velocities [48][49][50][51][52][53][54][55][56][57][58][59][60] or even the detailed shape of its distribution function [61][62][63]…”

Section: Jcap01(2024)023mentioning

confidence: 99%

Distinguishing thermal histories of dark matter from structure formation

Huang,

Li,

2024

J. Cosmol. Astropart. Phys.

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It is important to understand the implications of current observational constraints and potential signatures on the thermal history of dark matter. In this paper, we build the connection between the present-day velocities and the production mechanism of dark matter and find that the current observation on structure formation can be imposed to constrain the decoupling temperatures and the phase-space distribution of dark matter. We further explore the potential of distinguishing different possible thermal histories of dark matter with hypothetical future observational data. Using the freeze-in/-out scenarios as templates, we find that future precision data may uniquely identify the allowed parameter spaces for freeze-in and freeze-out, or even completely rule out one of the scenarios. This method can be more generally applied to other scenarios.

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“…Dark matter below an MeV may arise from self-interacting DM freeze-out after neutrino decoupling [32,33] or through DM freeze-in for sufficiently small couplings [34,35]. DM self-interactions also reduce the lower bound on DM mass from Lyman-α constraints [36,37].…”

Section: Introductionmentioning

confidence: 99%

Time-delayed neutrino emission from supernovae as a probe of dark matter-neutrino interactions

Carpio

Kheirandish

Murase

2023

J. Cosmol. Astropart. Phys.

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Thermal MeV neutrino emission from core-collapse supernovae offers a unique opportunity to probe physics beyond the Standard Model in the neutrino sector. The next generation of neutrino experiments, such as DUNE and Hyper-Kamiokande, can detect 𝒪(103) and 𝒪(104) neutrinos in the event of a Galactic supernova, respectively. As supernova neutrinos propagate to Earth, they may interact with the local dark matter via hidden mediators and may be delayed with respect to the initial neutrino signal. We show that for sub-MeV dark matter, the presence of dark matter-neutrino interactions may lead to neutrino echoes with significant time delays. The absence or presence of this feature in the light curve of MeV neutrinos from a supernova allows us to probe parameter space that has not been explored by dark matter direct detection experiments.

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Dark matter self-interactions in the matter power spectrum

Cited by 5 publications

References 53 publications

Hot and heavy dark matter from a weak scale phase transition

Hot and heavy dark matter from a weak scale phase transition

Distinguishing thermal histories of dark matter from structure formation

Time-delayed neutrino emission from supernovae as a probe of dark matter-neutrino interactions

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