New CMB spectral distortion constraints on decaying dark matter with full evolution of electromagnetic cascades before recombination

Acharya, Sandeep Kumar; Khatri, Rishi

doi:10.1103/physrevd.99.123510

Cited by 22 publications

(45 citation statements)

References 41 publications

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“…In this section, we expand the results of [32] to additional decay channels. We derive constraints on dark matter decaying to various standard model particles in the energy range greater than ∼100 MeV i.e.…”

Section: Dark Matter Decay To Standard Model Particlesmentioning

confidence: 99%

“…Taking these ultra-relativistic distortions into account modify the constraints on energy injections. It was shown in [32] that for dark matter decay to monochromatic electron-positron pairs or photon pairs, the constraints can relax by upto a factor of 4-5 for injection redshifts z inj <50000. In this paper, we extend these calculations to additional dark matter decay channels to standard model particles, Hawking evaporation of primordial black holes and decay of cosmic strings.…”

Section: Introductionmentioning

confidence: 99%

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CMB spectral distortions constraints on primordial black holes, cosmic strings and long lived unstable particles revisited

Acharya

Khatri

2020

J. Cosmol. Astropart. Phys.

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We calculate the spectral distortions from Hawking evaporation of primordial black holes before the epoch of recombination, taking into account emission of all standard model particles, including quark and gluons, and evolving the resulting particle cascades in the expanding Universe. We show that the constraints on the abundance of primordial black holes are stronger by more than an order of magnitude compared to the previous calculations which take only the primary photon emission into account. We also show that the shapes of the spectral distortions is different from the y or i-type distortions and are sensitive to the mass of the primordial black holes. We also extend previous constraints on the decay of long lived unstable particles before recombination to additional decay channels. We show that for dark matter mass 1 GeV, the spectral distortion shape is a function of the dark matter mass as well as the decay channel to standard model particles. We also provide new spectral distortion constraints on superconducting cosmic string decay. We explicitly show that consideration of emitted photon spectrum from string decay is not only important for the future experiments but also for already available COBE-FIRAS data.

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Section: Dark Matter Decay To Standard Model Particlesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

CMB spectral distortions constraints on primordial black holes, cosmic strings and long lived unstable particles revisited

Acharya

Khatri

2020

J. Cosmol. Astropart. Phys.

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“…We give the full parameter table as well as 2-parameter probability density function (PDF) contour plots of dark matter decay fraction vs standard ΛCDM parameters for a few illustrative cases in Appendix D. [31]) is also shown. Energydependent spectral distortion constraints of [63] and extrapolated constraints for Primordial Inflation Explorer (PIXIE) [64], assuming a factor of 1000 improvement over COBE-FIRAS, are also shown. The two lines for BBN are our strongest constraints from 4 He destruction (stronger) and 2 H destruction for photon injection with the injected photon energy of E γ = 26 MeV and 5 MeV respectively.…”

Section: Planck Cmb Constraints On Dark Matter Decaymentioning

confidence: 99%

“…Therefore, for longer decay lifetimes (or lower decay redshifts) constraints on decaying dark matter get stronger in general. However, the scaling is not exactly (1 + z) since the electromagnetic cascade evolution also has a redshift dependence [63]. Table 2: Theoretical predictions and observational bounds on primordial abundance of light elements.…”

Section: Cmb Spectral Distortionsmentioning

confidence: 99%

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CMB anisotropy and BBN constraints on pre-recombination decay of dark matter to visible particles

Acharya

Khatri

2019

J. Cosmol. Astropart. Phys.

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Injection of high energy electromagnetic particles around the recombination epoch can modify the standard recombination history and therefore the CMB anisotropy power spectrum. Previous studies have put strong constraints on the amount of electromagnetic energy injection around the recombination era (redshifts z 4500). However, energy injected in the form of energetic (> keV) visible standard model particles is not deposited instantaneously. The considerable delay between the time of energy injection and the time when all energy is deposited to background baryonic gas and CMB photons, together with the extraordinary precision with which the CMB anisotropies have been measured, means that CMB anisotropies are sensitive to energy that was injected much before the epoch of recombination. We show that the CMB anisotropy power spectrum is sensitive to energy injection even at z = 10000, giving stronger constraints compared to big bang nucleosynthesis and CMB spectral distortions. We derive, using Planck CMB data, the constraints on long-lived unstable particles decaying at redshifts z 10000 (lifetime τ X 10 11 s) by explicitly evolving the electromagnetic cascades in the expanding Universe, thus extending previous constraints to lower particle lifetimes. We also revisit the BBN constraints and show that the delayed injection of energy is important for BBN constraints. We find that the constraints can be weaker by a factor of few to almost an order of magnitude, depending on the energy, when we relax the quasi-static or on-the-spot assumptions.

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Theory of Kaon-Nuclear Systems

Hyodo

Weise

2022

Handbook of Nuclear Physics

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New CMB spectral distortion constraints on decaying dark matter with full evolution of electromagnetic cascades before recombination

Cited by 22 publications

References 41 publications

CMB spectral distortions constraints on primordial black holes, cosmic strings and long lived unstable particles revisited

CMB spectral distortions constraints on primordial black holes, cosmic strings and long lived unstable particles revisited

CMB anisotropy and BBN constraints on pre-recombination decay of dark matter to visible particles

Theory of Kaon-Nuclear Systems

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