Isotropic extragalactic flux from dark matter annihilations: lessons from interacting dark matter scenarios

Moliné, Ángeles; Schewtschenko, J. A.; Palomares‐Ruiz, Sergio; Bœhm, Céline; Baugh, C. M.

doi:10.1088/1475-7516/2016/08/069

Cited by 15 publications

(38 citation statements)

References 173 publications

(237 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…where an additional mass-dependent correction to the standard ST formalism appears. We use a = −0.6 and b = 0.5, as obtained in [3,80]. The function dn ST, WDM dM in Eq.…”

Section: Appendix A: Halo Mass Functionsmentioning

confidence: 99%

Dark matter microphysics and 21 cm observations

2019

View full text Add to dashboard Cite

Dark matter interactions with massless or very light Standard Model particles, as photons or neutrinos, may lead to a suppression of the matter power spectrum at small scales and of the number of low mass haloes. Bounds on the dark matter scattering cross section with light degrees of freedom in such interacting dark matter (IDM) scenarios have been obtained from e.g. early time cosmic microwave background physics and large scale structure observations. Here we scrutinize dark matter microphysics in light of the claimed 21 cm EDGES 78 MHz absorption signal. IDM is expected to delay the 21 cm absorption features due to collisional damping effects. We identify the astrophysical conditions under which the existing constraints on the dark matter scattering cross section could be largely improved due to the IDM imprint on the 21 cm signal, providing also an explicit comparison to the WDM scenario.

show abstract

“…where an additional mass-dependent correction to the standard ST formalism appears. We use a = −0.6 and b = 0.5, as obtained in [3,80]. The function dn ST, WDM dM in Eq.…”

Section: Appendix A: Halo Mass Functionsmentioning

confidence: 99%

Dark matter microphysics and 21 cm observations

2019

View full text Add to dashboard Cite

show abstract

“…12 However, the Sommerfeld effect might be important at late times, and it might increase the neutrino production in the Galactic halo, in particular for v 2 -dependent cross sections and DM masses above 1 TeV [127,128]. Nevertheless, our analysis focuses on smaller DM masses, and we do not consider the effects of such enhancements, although this might rule out tiny DM mass 9 If DM is a Majorana particle, the coupling is chiral, and…”

Section: Annihilation Cross Sectionmentioning

confidence: 99%

“…The top (bottom) line corresponds to a vector coupling to a complex scalar or Dirac DM candidate, respectively. 9 This type of interaction was initially introduced in Refs. [19,28] as an attempt to build viable models of sub-GeV DM candidates and illustrates the new collisional damping effects described in Refs.…”

Section: B Scenarios With a Vector Mediatormentioning

confidence: 99%

“…They can explain the observed DM relic density if DM has been thermally produced and annihilations into neutrinos are the dominant channel. They can also lead to DM indirect detection signatures if DM annihilates or decays into neutrinos in the galaxy [1][2][3][4][5][6] or via cosmic neutrino signals [7][8][9]. They can further produce dips in the diffuse supernova neutrino background [10] and lead to possible anisotropies in the angular distribution of highenergy neutrinos caused by their scattering off DM particles [11] (see also Ref.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Dark matter-neutrino interactions through the lens of their cosmological implications

et al. 2018

Self Cite

View full text Add to dashboard Cite

Dark matter and neutrinos provide the two most compelling pieces of evidence for new physics beyond the Standard Model of particle physics, but they are often treated as two different sectors. The aim of this paper is to determine whether there are viable particle physics frameworks in which dark matter can be coupled to active neutrinos. We use a simplified model approach to determine all possible scenarios where there is such a coupling and study their astrophysical and cosmological signatures. We find that dark matter-neutrino interactions have an impact on structure formation and lead to indirect detection signatures when the coupling between dark matter and neutrinos is sufficiently large. This can be used to exclude a large fraction of the parameter space. In most cases, dark matter masses up to a few MeV and mediator masses up to a few GeV are ruled out. The exclusion region can be further extended when dark matter is coupled to a spin-1 mediator or when the dark matter particle and the mediator are degenerate in mass if the mediator is a spin-0 or spin-1=2 particle.

show abstract

“…This matter power spectrum features a cut-off around a smooth scale of ∼ 100 kpc, and therefore a suppression of the number of halos in the lower mass range. The impact of such IDM initial matter power spectrum on the abundance of halos was studied in [30,46], where a comparison with the standard CDM result was also presented. A suppression of the number of low-mass halos with masses below M 200 ∼ 10 11 h −1 M was found, which became particularly significant at the smallest considered halo masses.…”

Section: Subhalo Abundancesmentioning

confidence: 99%

Properties of Subhalos in the Interacting Dark Matter Scenario

et al. 2019

Self Cite

View full text Add to dashboard Cite

One possible and natural derivation from the collisionless cold dark matter (CDM) standard cosmological framework is the assumption of the existence of interactions between dark matter (DM) and photons or neutrinos. Such possible interacting dark matter (IDM) model would imply a suppression of small-scale structures due to a large collisional damping effect, even though the weakly interacting massive particle (WIMP) can still be the DM candidate. Because of this, IDM models can help alleviate alleged tensions between standard CDM predictions and observations at small mass scales. In this work, we investigate the properties of DM halo substructure or subhalos formed in a high-resolution cosmological N-body simulation specifically run within these alternative models. We also run its CDM counterpart, which allowed us to compare subhalo properties in both cosmologies. We show that, in the lower mass range covered by our simulation runs, both subhalo concentrations and abundances are systematically lower in IDM compared to the CDM scenario. Yet, as in CDM, we find that median IDM subhalo concentration values increase towards the innermost regions of their hosts for same mass subhalos. Also similarly to CDM, we find IDM subhalos to be more concentrated than field halos of the same mass. Our work has a direct application on studies aimed at the indirect detection of DM where subhalos are expected to boost the DM signal of their host halos significantly. From our results, we conclude that the role of halo substructure in DM searches will be less important in interacting scenarios than in CDM but far from being negligible.

show abstract

Isotropic extragalactic flux from dark matter annihilations: lessons from interacting dark matter scenarios

Cited by 15 publications

References 173 publications

Dark matter microphysics and 21 cm observations

Dark matter microphysics and 21 cm observations

Dark matter-neutrino interactions through the lens of their cosmological implications

Properties of Subhalos in the Interacting Dark Matter Scenario

Contact Info

Product

Resources

About