Converting nonrelativistic dark matter to radiation

Bringmann, Torsten; Kahlhoefer, Felix; Schmidt-Hoberg, Kai; Walia, Parampreet

doi:10.1103/physrevd.98.023543

Cited by 124 publications

(134 citation statements)

References 98 publications

Supporting

Mentioning

131

Contrasting

Order By: Relevance

“…Of course, the bounds on the Hubble parameter obtained in this way assume that the value of N eff is the same at BBN time (relevant for helium bounds) and CMB times (relevant for the sound horizon). Models in which extra radiation is created only after BBN (like the sterile neutrino model of [14] or the Dark Matter converting into Dark Radiation model of [20]) naturally evade combined BAO+deuterium+helium bounds on H 0 , and can potentially accommodate arbitrary large H 0 values as long as they also agree with CMB and LSS data.…”

Section: λCdm + N Eff Modelmentioning

confidence: 99%

The BAO+BBN take on the Hubble tension

Schöneberg

Lesgourgues

Hooper

2019

J. Cosmol. Astropart. Phys.

230

174

View full text Add to dashboard Cite

Many attempts to solve the Hubble tension with extended cosmological models combine an enhanced relic radiation density, acting at the level of background cosmology, with new physical ingredients affecting the evolution of cosmological perturbations. Several authors have pointed out the ability of combined Baryon Acoustic Oscillation (BAO) and Big Bang Nucleosynthesis (BBN) data to probe the background cosmological history independently of both CMB maps and supernovae data. Using state-of-the-art assumptions on BBN, we confirm that combined BAO, deuterium, and helium data are in tension with the SH0ES measurements under the ΛCDM assumption at the 3.2σ level, while being in close agreement with the CMB value. We subsequently show that floating the radiation density parameter N eff only reduces the tension down to the 2.6σ level. This conclusion, totally independent of any CMB data, shows that a high N eff accounting for extra relics (either free-streaming or self-interacting) does not provide an obvious solution to the crisis, not even at the level of background cosmology. To circumvent this strong bound, (i) the extra radiation has to be generated after BBN to avoid helium bounds, and (ii) additional ingredients have to be invoked at the level of perturbations to reconcile this extra radiation with CMB and LSS data.

show abstract

Section: λCdm + N Eff Modelmentioning

confidence: 99%

The BAO+BBN take on the Hubble tension

Schöneberg

Lesgourgues

Hooper

2019

J. Cosmol. Astropart. Phys.

230

174

View full text Add to dashboard Cite

show abstract

“…For example, a statistically significant tension currently exists between the value of H now obtained from local probes of the cosmic expansion rate (including not only Type Ia supernova data [35][36][37], but also lensing time-delay experiments [38,39]) and the value inferred from CMB data in the context of a ΛCDM cosmology [40][41][42][43]. Dark-matter decays between t LS and t now have been posited as one possible [44][45][46][47][48] way of alleviating these tensions. While it has not been our aim in this paper to address this tension, it is likely that the DDM framework can serve to alleviate these tensions in new and interesting ways.…”

Section: Discussionmentioning

confidence: 99%

Constraining dark-matter ensembles with supernova data

Desai

Thomas

2020

Phys. Rev. D

View full text Add to dashboard Cite

The constraints on non-minimal dark sectors involving ensembles of unstable dark-matter species are well established and quite stringent in cases in which these species decay to visible-sector particles. However, in cases in which these ensembles decay exclusively to other, lighter dark-sector states, the corresponding constraints are less well established. In this paper, we investigate how information about the expansion rate of the universe at low redshifts gleaned from observations of Type Ia supernovae can be used to constrain ensembles of unstable particles which decay primarily into dark radiation. arXiv:1909.07981v1 [astro-ph.CO]

show abstract

“…On the other hand, the axions produced by the axino NLSP decay will constitute 'dark radiation', i.e., ultrarelativistic and invisible species with respect to the cold DM measured by Planck. The amount of dark radiation is under stringent constraints [53][54][55][56][57], and as a consequence it gives a small contribution to the total DM density. A quantity that will be useful along this work is the fraction of axino NLSP that decays into dark radiation.…”

Section: Relic Density For Multicomponent Dark Mattermentioning

confidence: 99%

“…The magenta regions in both panels are excluded by cosmological observations for DDM models [53][54][55][56][57], taking in to account the stringent constraints on the fraction of axino NLSP relic density that decays to dark radiation, f DM ddm . Usually these constraints are presented as upper limits for this fraction, which are then translated into upper limits on fã, for a fixed r 3/2 according to Eq.…”

Section: Constraints From Cosmological Observationsmentioning

confidence: 99%

MeV-GeV γ-ray telescopes probing axino LSP/gravitino NLSP as dark matter in the μνSSM

Gomez-Vargas

López-Fogliani

Muñoz

et al. 2020

J. Cosmol. Astropart. Phys.

View full text Add to dashboard Cite

In R-parity violating supersymmetry, the gravitino as the lightest supersymmetric particle (LSP) is a good candidate for dark matter, with the interesting characteristic to be detectable through γ-ray telescopes. We extend this analysis considering an axino next-to-LSP (NLSP) as a coexisting dark matter particle contributing with a detectable signal in the γ-ray spectrum. The analysis is carried out in the framework of the µνSSM, which solves the µ problem reproducing simultaneously neutrino data only with the addition of right-handed neutrinos. We find that important regions of the parameter space can be tested by future MeV-GeV γ-ray telescopes through the line signal coming from the decay of the axino NLSP into photon-neutrino. In a special region, a double-line signal from axino NLSP and gravitino LSP is possible with both contributions detectable. IntroductionGravitino (ψ 3/2 ) LSP or axino (ã) LSP are interesting candidates for dark matter (DM) in the framework of supersymmetry (SUSY). In addition, in SUSY models where there is Rparity violation (RPV) these particles decay with a lifetime longer than the age of the Universe, producing a line signal potentially detectable in γ-ray telescopes. This was analyzed for the gravitino LSP in Refs. [1][2][3][4][5][6][7][8][9][10][11] in the context of bilinear/trilinear RPV models [12], and in Refs. [13][14][15][16] in the 'µ from ν' supersymmetric standard model (µνSSM) [17]. Similar analyses for axino LSP in bilinear/trilinear RPV models were carried out in Refs. [18][19][20][21][22][23][24][25][26][27].In a recent work [28], we analyzed a multicomponent DM scenario with axino LSP and gravitino NLSP. This is a decaying dark matter (DDM) scenario, where the gravitino in addition to the RPV decay channel into photon-neutrino, also undergoes an R-parity conserving (RPC) decay into axion-axino. The analysis was carried out in the framework of the µνSSM, where couplings involving right-handed neutrinos are introduced solving the µ-problem and reproducing simultaneously the neutrino data [17,[29][30][31][32]. A brief discussion and bibliography about the interesting phenomenology associated to the µνSSM, can be found in Ref. [28], where it was shown that significant regions of the parameter space of the model can be probed through a line signal coming from the axino decay. A doubleline signal as smoking gun through the further contribution of the gravitino decay is also possible in a subset of those regions.Here we want to extend our previous work, analyzing the opposite DDM scenario where the gravitino is the LSP and the axino the NLSP. Their masses, although model dependent can be of the same order in several realistic scenarios [33][34][35][36][37] such as in supergravity, and therefore if the axino (gravitino) is the LSP the gravitino (axino) becomes naturally the NLSP. As a consequence, the NLSP decays into the LSP plus an axion. In this not yet explored RPV scenario with gravitino LSP and axino NLSP, we will study its cosmological properties as well as the associa...

show abstract

Converting nonrelativistic dark matter to radiation

Cited by 124 publications

References 98 publications

The BAO+BBN take on the Hubble tension

The BAO+BBN take on the Hubble tension

Constraining dark-matter ensembles with supernova data

MeV-GeV γ-ray telescopes probing axino LSP/gravitino NLSP as dark matter in the μνSSM

Contact Info

Product

Resources

About