Cosmological beam dump: Constraints on dark scalars mixed with the Higgs boson

Fradette, Anthony; Pospelov, Maxim; Pradler, Josef; Ritz, Adam

doi:10.1103/physrevd.99.075004

Cited by 45 publications

(55 citation statements)

References 93 publications

(180 reference statements)

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“…Shaded parameter space is excluded by non-observation of anomalous meson decays at the CHARM experiment [87]. There are additional constraints on the Higgs portal scalar from cosmological considerations, including contributions to relativistic degrees of freedom, distortions of the cosmic microwave background, and primordial nucleosynthesis abundances [88]. section causes white dwarfs to explode.…”

Section: Discussionmentioning

confidence: 99%

Supernovae sparked by dark matter in white dwarfs

Acevedo

Bramante

2019

Phys. Rev. D

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It was recently demonstrated that asymmetric dark matter can ignite supernovae by collecting and collapsing inside lone sub-Chandrasekhar mass white dwarfs, and that this may be the cause of Type Ia supernovae. A ball of asymmetric dark matter accumulated inside a white dwarf and collapsing under its own weight, sheds enough gravitational potential energy through scattering with nuclei, to spark the fusion reactions that precede a Type Ia supernova explosion. In this article we elaborate on this mechanism and use it to place new bounds on interactions between nucleons and asymmetric dark matter for masses m X = 10 6 − 10 16 GeV. Interestingly, we find that for dark matter more massive than 10 11 GeV, Type Ia supernova ignition can proceed through the Hawking evaporation of a small black hole formed by the collapsed dark matter. We also identify how a cold white dwarf's Coulomb crystal structure substantially suppresses dark matter-nuclear scattering at low momentum transfers, which is crucial for calculating the time it takes dark matter to form a black hole. Higgs and vector portal dark matter models that ignite Type Ia supernovae are explored.

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Section: Discussionmentioning

confidence: 99%

Supernovae sparked by dark matter in white dwarfs

Acevedo

Bramante

2019

Phys. Rev. D

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“…Ref. [122] considered freeze-in (and subsequent decay) of the scalar Higgs portal mediator to set additional bounds, but we don't show them here as they are specific to the Higgs portal and depend on the reheating scale.…”

Section: Scalar Mediator Portalsmentioning

confidence: 85%

“…The cryogenic crystal was operated above ground without significant shielding for 2.27 hours, the background level in the region of interest was 1.2 ⇥ 10 5 events/(kg ⇥ d ⇥ keV ee ) [121]. In a small window around 0.5-06 GeV/c 2 the best exclusion limit around 3 ⇥ 10 37 cm 2 is from NEWS-G, a spherical proportional counter with 60 cm diameter and filled with a Ne+CH 4 (0.7%) gas-mixture at 3.1 bar (corresponding to 283 g) [122]. With its low threshold of 36.5 eV ee and the use of the low-A gas neon the instrument was optimized to search for low-mass WIMPs.…”

Section: Scattering Rates and Experimental Statusmentioning

confidence: 99%

Dark matter models and direct detection

Lin¹

2019

Proceedings of Theoretical Advanced Study Institute Summer School 2018 "Theory in an Era of Data" — PoS(TASI2018)

134

137

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These lectures provide an introduction to models and direct detection of dark matter. We summarize the general features and motivations for candidates in the full dark matter mass range, and then restrict to the ∼keV-TeV mass window. Candidates in this window can be produced by thermal mechanisms in the standard cosmology, and are an important target for experimental searches. We then turn to sub-GeV dark matter (light dark matter) and dark sectors, an area where many new models and experiments are currently being proposed. We discuss the cosmology of dark sectors, specific portal realizations, and some of the prospects for detection. The final parts of these lectures focus on the theory for direct detection, both reviewing the fundamentals for nuclear recoils of WIMPs and describing new directions for sub-GeV candidates.

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“…When the decay into µ, π JHEP05(2019)177 are kinematically forbidden, such a mediator decays mostly into e + e − , and the constraints have been discussed in refs. [92,[130][131][132][133]. The effect on CMB (on the MeV mediators relevant for our context), is mainly due to the enhanced DM annihilation rate during the recombination epoch [128].…”

Section: Constraints From Cosmology and Astro-physicsmentioning

confidence: 97%

Scope of self-interacting thermal WIMPs in a minimal U(1)D extension and its future prospects

Barman

Bhattacherjee

Chatterjee

et al. 2019

J. High Energ. Phys.

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In this work we have considered a minimal extension of Standard Model by a local U(1) gauge group in order to accommodate a stable (fermionic) Dark Matter (DM) candidate. We have focussed on parameter regions where DM possesses adequate selfinteraction, owing to the presence of a light scalar mediator (the dark Higgs), alleviating some of the tensions in the small-scale structures. We have studied the scenario in the light of a variety of data, mostly from dark matter direct searches, collider searches and flavor physics experiments, with an attempt to constrain the interactions of the standard model (SM) particles with the ones in the Dark Sector (DS). Assuming a small gauge kinetic mixing parameter, we find that for rather heavy DM the most stringent bound on the mixing angle of the Dark Higgs with the SM Higgs boson comes from dark matter direct detection experiments, while for lighter DM, LHC constraints become more relevant. Note that, due to the presence of very light mediators, the effective operator approach to the direct detection is inapplicable here and these constraints have been re-evaluated for our scenario. In addition, we find that the smallness of the relevant portal couplings, as dictated by data, critically suppress the viability of DM production by the standard "freeze-out" mechanism in such simplified scenarios. In particular, the viable DM masses are O(2) GeV i.e. in the regions where direct detection limits tend to become weak. For heavier DM with large self-interactions, we hence conclude that non-thermal production mechanisms are favored. Lastly, future collider reach of such a simplified scenario has also been studied in detail.The evidence for existence of non-relativistic non-luminous Dark Matter (DM) has been overwhelming. Several astrophysical and cosmological observations have indicated the presence of DM [1]. Within the paradigm of the standard model of cosmology (ΛCDM) recent measurements of the Cosmic Microwave Background Radiation (CMBR) estimated that about 26% of the energy budget of our Universe consists of DM [2, 3]. 1 CMBR, together with Big Bang Nucleosynthesis (BBN) requires DM to be non-baryonic. Astro-physical objects, especially primordial black holes (PBHs) have been considered as DM candidates. While such PBHs, for certain windows of mass 2 can account for the entire energy budget of DM, it has been shown that adequate production of PBHs after (single-field slow-roll) inflation can be difficult [7,8]. However, the standard model (SM) of particle physics, does not incorporate any suitable DM candidate. Various extensions of the SM has been considered in the literature [9,10]. A generic aspect in DM models concerns about the stability of DM. Constraints from structure formation, indirect searches [11][12][13] and CMB [14] require DM to be very long-lived (life-time τ 10 26 s depending on the decay modes). The simplest models introduce a global symmetry to prevent the decay of DM. However, it has been argued that such global symmetries may be broken due to gravitational...

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Cosmological beam dump: Constraints on dark scalars mixed with the Higgs boson

Cited by 45 publications

References 93 publications

Supernovae sparked by dark matter in white dwarfs

Supernovae sparked by dark matter in white dwarfs

Dark matter models and direct detection

Scope of self-interacting thermal WIMPs in a minimal U(1)D extension and its future prospects

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