Revisiting big-bang nucleosynthesis constraints on long-lived decaying particles

Kawasaki, Masahiro; Kohri, Kazunori; Moroi, Takeo; Takaesu, Yoshitaro

doi:10.1103/physrevd.97.023502

Cited by 231 publications

(280 citation statements)

References 81 publications

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“…Once the pair-production on CMB photons becomes important, the fraction of injected energy going into destruction of elements drops and BBN constraints on energy injection become weak. BBN constraints, limited by the astrophysical uncertainties on the measurement of the abundance of light elements, are well established [16][17][18][19]. Previous calculations however neglected Hubble expansion whose importance was emphasized recently [4].…”

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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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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“…The high energy photons in the cascade can also destroy primordial elements produced in the BBN, changing their abundances [39][40][41][42][43][44][45]. We revisit the BBN constraints in section 6.…”

Section: Introductionmentioning

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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“…For example for Λ IR = 10 TeV, y = 1,ỹ = 10 −9 , m L = 800 GeV and assuming that the mass of the lightest N N c bound state is ∼ 3Λ G f , we find that its lifetime is of order 1000 s while it can kinematically only decay into electron pairs or lighter states. This then satisfies the corresponding limit on the lifetime of order 10 4 s [76]. Alternatively, one could add new decay channels for the bound states which can allow them to decay faster and sufficiently long before big bang nucleosynthesis.…”

Section: Jhep07(2018)033mentioning

confidence: 99%

A warped relaxion

Fonseca¹,

Harling²,

Lima³

et al. 2018

J. High Energ. Phys.

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We construct a UV completion of the relaxion in a warped extra dimension. We identify the relaxion with the zero mode of the fifth component of a bulk gauge field and show how hierarchically different decay constants for this field can be achieved by different localizations of anomalous terms in the warped space. This framework may also find applications for other axion-like fields. The cutoff of the relaxion model is identified as the scale of the IR brane where the Higgs lives, which can be as high as 10 6 GeV, while above this scale warping takes over in protecting the Higgs mass.

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Revisiting big-bang nucleosynthesis constraints on long-lived decaying particles

Cited by 231 publications

References 81 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

A warped relaxion

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