Turn up the volume: listening to phase transitions in hot dark sectors

Ertas, Fatih; Kahlhoefer, Felix; Carlo, Tasillo,

doi:10.1088/1475-7516/2022/02/014

Cited by 23 publications

(28 citation statements)

References 66 publications

(120 reference statements)

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“…Accumulation of the DM around various celestial bodies could lead to novel indirect detection signals or modify the properties and evolution of the bodies in question [107][108][109][110]. Furthermore, the early matter-dominant epoch in our setup, which is required for significant entropy injection after the glueballs decay, can also give rise to interesting signatures in the matter power spectrum and indirect detection experiments [105,106,135], as well as modifying the spectrum of gravitational waves from other sources [136][137][138][139][140][141].…”

Section: Discussionmentioning

confidence: 99%

Glueballs in a thermal squeezeout model

Asadi

Kramer

Kuflik

et al. 2022

J. High Energ. Phys.

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It has been shown that a first order confinement phase transition can drastically change the relic dark matter abundance in confining dark sectors with only heavy dark quarks. We study the phenomenology of one such model with a Z′ portal to Standard Model. We find that dark glueballs are long-lived in this setup and dilute the dark matter abundance after their decay to Standard Model. With this effect, the correct relic abundance is obtained with dark matter masses up to $$ \mathcal{O} $$ O (106) TeV. We find that while a part of the parameter space is already ruled out by direct detection and collider searches, there is still a broad space of viable scenarios that can be probed by future experiments.

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Section: Discussionmentioning

confidence: 99%

Glueballs in a thermal squeezeout model

Asadi

Kramer

Kuflik

et al. 2022

J. High Energ. Phys.

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“…The net effect on GW signals was studied in ref. [124], pointing out that the enhancement effect due a higher dark temperature can dominate in a large region of parameter space. Different from the one-temperature scenario, where λ p shown in figure 4 indicates scalar decay well before the epoch of big-bang nucleosynthesis, indirect detection for a hotter dark sector with a much smaller λ p could still be feasible in cosmology.…”

Section: Hear and See The Dark: Complementary Tests Of Dm Gw And Coll...mentioning

confidence: 99%

Dark phase transition from WIMP: complementary tests from gravitational waves and colliders

Kanemura,

2024

J. Cosmol. Astropart. Phys.

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A dark sector is an interesting place where a strong first-order phase transition, observable gravitational waves and/or a dark matter candidate could arise. However, the experimental tests for such a dark sector could be ambiguous due to the dark content, largely unconstrained parameter space and the connection to the visible world. We consider a minimal dark scalar-vector boson plasma to realize the three mentioned phenomena, with a unique connection to the Standard Model via the Higgs portal coupling. We discuss the important features of the Higgs portal in such a minimal dark sector, namely the dark thermalization, collider tests, and direct detection of dark matter. We perform numerical analyses of the dark phase transition associated with stochastic gravitational waves and dark matter, discussing the complementarity of collider detection, dark matter direct detection and space-based/terrestrial interferometers as a promising avenue to hear and see the minimal dark sector.

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“…Despite being derived from a decaying neutrino model, our analysis is agnostic about the particle physics realization of the decaying species. The model agnosticism is a powerful asset of our model, implying that the current analysis applies to many examples found in the literature, such as early hot dark sectors [44], sterile neutrino decays into majorons and the subsequent decays of majorons into neutrinos [45,46], as well as neutrino decays realized by a range of particle physics models [37,47,48]. The only immediate restriction is in the choice of initial conditions, although it is straightforward to implement changes to these initial conditions in our code if desired.…”

Section: Physical Systemmentioning

confidence: 99%

Decaying warm dark matter revisited

Holm¹,

Tram²,

Hannestad³

2022

Preprint

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Decaying dark matter models provide a physically motivated way of channeling energy between the matter and radiation sectors. In principle, this could affect the predicted value of the Hubble constant in such a way as to accommodate the discrepancies between CMB inferences and local measurements of the same. Here, we revisit the model of warm dark matter decaying non-relativistically to invisible radiation. In particular, we rederive the background and perturbation equations starting from a decaying neutrino model and describe a new, computationally efficient method of computing the decay product perturbations up to large multipoles. We conduct MCMC analyses to constrain all three model parameters, for the first time including the mass of the decaying species, and assess the ability of the model to alleviate the Hubble and σ 8 tensions, the latter being the discrepancy between the CMB and weak gravitational lensing constraints on the amplitude of matter fluctuations on an 8h −1 Mpc −1 scale. We find that the model reduces the H 0 tension from ∼ 4σ to ∼ 3σ and neither alleviates nor worsens the S 8 ≡ σ 8 (Ω m /0.3) 0.5 tension, ultimately showing only mild improvements with respect to ΛCDM. However, the values of the model-specific parameters favoured by data is found to be well within the regime of relativistic decays where inverse processes are important, rendering a conclusive evaluation of the decaying warm dark matter model open to future work.

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Turn up the volume: listening to phase transitions in hot dark sectors

Cited by 23 publications

References 66 publications

Glueballs in a thermal squeezeout model

Glueballs in a thermal squeezeout model

Dark phase transition from WIMP: complementary tests from gravitational waves and colliders

Decaying warm dark matter revisited

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