The synergy between CMB spectral distortions and anisotropies

Lucca, Matteo; Schöneberg, Nils; Hooper, Deanna C.; Lesgourgues, Julien; Chluba, Jens

doi:10.1088/1475-7516/2020/02/026

Cited by 85 publications

(166 citation statements)

References 203 publications

(563 reference statements)

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“…The evaporating PBHs emit high-energy particles whose electromagnetic energy can modify the recombination history and background temperature. This potentially affects the observations of CMB anisotropy [716,771,903,904,905,906] and cosmological 21 cm line signals [716,875,907]. By the non-detection of those features one can constrain the abundance of PBHs for the masses of 10 13.5 g m PBH 10 14.5 g.…”

Section: Observational Constraints On Pbhsmentioning

confidence: 99%

The First Three Seconds: a Review of Possible Expansion Histories of the Early Universe

Allahverdi¹,

Amin²,

Berlin³

et al. 2021

TheOJA

200

140

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It is commonly assumed that the energy density of the Universe was dominated by radiation between reheating after inflation and the onset of matter domination 54,000 years later. While the abundance of light elements indicates that the Universe was radiation dominated during Big Bang Nucleosynthesis (BBN), there is scant evidence that the Universe was radiation dominated prior to BBN. It is therefore possible that the cosmological history was more complicated, with deviations from the standard radiation domination during the earliest epochs. Indeed, several interesting proposals regarding various topics such as the generation of dark matter, matter-antimatter asymmetry, gravitational waves, primordial black holes, or microhalos during a nonstandard expansion phase have been recently made. In this paper, we review various possible causes and consequences of deviations from radiation domination in the early Universe -taking place either before or after BBN -and the constraints on them, as they have been discussed in the literature during the recent years.

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Section: Observational Constraints On Pbhsmentioning

confidence: 99%

The First Three Seconds: a Review of Possible Expansion Histories of the Early Universe

Allahverdi¹,

Amin²,

Berlin³

et al. 2021

TheOJA

200

140

View full text Add to dashboard Cite

show abstract

“…In particular, even after taking into account intermediate or i-type distortions [72,73], e.g. in [63,74], there is significant corrections to non-relativistic y-type and i-type distortions [46,63] the injected particles have energy m e . It was shown in [63] that, the spectral distortion constraints are energy dependent and can be relaxed with respect to the constraints obtained assuming y-type spectrum by a factor of 4 to 5.…”

Section: Cmb Spectral Distortionsmentioning

confidence: 99%

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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“…Spectral distortion constraints for primordial black holes with mass range ∼ 10 11 g -10 13 g (corresponding to black hole evaporation between y and µ era) have previously been studied in [40], which assumed that only the primary photon emission produces thermal distortion and ignore other particle emissions. However, recent work of [41] takes into account all particles but assumes that all energy goes into nonrelativistic y, i and µ-type distortions (referred collectively hereafter as the yim distortions). Black holes emit all particles democratically provided the emission is kinematically allowed i.e.…”

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 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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The synergy between CMB spectral distortions and anisotropies

Cited by 85 publications

References 203 publications

The First Three Seconds: a Review of Possible Expansion Histories of the Early Universe

The First Three Seconds: a Review of Possible Expansion Histories of the Early Universe

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

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

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