Energy injection and absorption in the cosmic dark ages

Slatyer, Tracy R.

doi:10.1103/physrevd.87.123513

Cited by 142 publications

(195 citation statements)

References 47 publications

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“…This is referred to in Refs. [5] and [24] as taking a "dot product," but there is a subtlety here in that the dot product must be taken in the space defined by the 41 f sys ðzÞ curves, not in the space of functions of z. In the Fisher matrix approach, this corresponds to taking the dot product between the (discretized) f sys ðzÞ curve for that particular model and the vector ðeÞ T F, where e is the (discretized) universal eðzÞ curve and F is the marginalized Fisher matrix describing the effect on the CMB of energy depositions localized in redshift (see Ref.…”

Section: A Universal Energy Deposition Curve With Systematic Correctmentioning

confidence: 99%

Current dark matter annihilation constraints from CMB and low-redshift data

2014

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Updated constraints on the dark matter cross section and mass are presented combining cosmic microwave background (CMB) power spectrum measurements from Planck, WMAP9, ACT, and SPT as well as several low-redshift data sets (BAO, HST, and supernovae). For the CMB data sets, we combine WMAP9 temperature and polarization data for l ≤ 431 with Planck temperature data for 432 ≤ l ≤ 2500, ACT and SPT data for l > 2500, and Planck CMB four-point lensing measurements. We allow for redshiftdependent energy deposition from dark matter annihilation by using a "universal" energy absorption curve. We also include an updated treatment of the excitation, heating, and ionization energy fractions and provide an updated deposition efficiency factors (f eff ) for 41 different dark matter models. Assuming perfect energy deposition (f eff ¼ 1) and a thermal cross section, dark matter masses below 26 GeV are excluded at the 2σ level. Assuming a more generic efficiency of f eff ¼ 0.2, thermal dark matter masses below 5 GeV are disfavored at the 2σ level. These limits are a factor of ∼2 improvement over those from WMAP9 data alone. These current constraints probe, but do not exclude, dark matter as an explanation for reported anomalous indirect detection observations from AMS-02/PAMELA and the Fermi gamma-ray inner-Galaxy data. They also probe relevant models that would explain anomalous direct detection events from CDMS, CRESST, CoGeNT, and DAMA, as originating from a generic thermal weakly interacting massive particle. Projected constraints from the full Planck release should improve the current limits by another factor of ∼2 but will not definitely probe these signals. The proposed CMB Stage IV experiment will more decisively explore the relevant regions and improve upon the Planck constraints by another factor of ∼2.

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Section: A Universal Energy Deposition Curve With Systematic Correctmentioning

confidence: 99%

Current dark matter annihilation constraints from CMB and low-redshift data

2014

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“…WMAP [4], SPT [5,6] and ACT [7]), and most recently by the Planck satellite [8], can thus place robust and modelindependent constraints on such energy injections (e.g. [9][10][11][12][13][14][15][16][17][18][19][20][21][22]). …”

Section: Introductionmentioning

confidence: 99%

Indirect dark matter signatures in the cosmic dark ages. I. Generalizing the bound ons-wave dark matter annihilation from Planck results

2016

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Recent measurements of the cosmic microwave background (CMB) anisotropies by Planck provide a sensitive probe of dark matter annihilation during the cosmic dark ages, and specifically constrain the annihilation parameter f eff hσvi=m χ . Using new results (paper II) for the ionization produced by particles injected at arbitrary energies, we calculate and provide f eff values for photons and e þ e − pairs injected at keV-TeV energies; the f eff value for any dark matter model can be obtained straightforwardly by weighting these results by the spectrum of annihilation products. This result allows the sensitive and robust constraints on dark matter annihilation presented by the Planck collaboration to be applied to arbitrary dark matter models with s-wave annihilation. We demonstrate the validity of this approach using principal component analysis. As an example, we integrate over the spectrum of annihilation products for a range of Standard Model final states to determine the CMB bounds on these models as a function of dark matter mass, and demonstrate that the new limits generically exclude models proposed to explain the observed high-energy rise in the cosmic ray positron fraction. We make our results publicly available at http://nebel.rc.fas.harvard .edu/epsilon.

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“…If the dark sector states are relatively heavy 100 MeV, constraints from collider observations easily allow decays before BBN [41]. Meanwhile, for lighter masses collider and astrophysics bounds require much longer decay times, and there is greater danger of observable energy injection [42], although again this may be allowed if the hidden sector temperature is relatively low. However, further study is required to ensure the coupling between the sectors does not disrupt freeze-in, and we leave this for future work.…”

Section: Dark Sectors With Annihilationsmentioning

confidence: 99%

Symmetric and asymmetric reheating

Hardy¹,

Unwin²

2017

J. High Energ. Phys.

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We study models in which the inflaton is coupled to two otherwise decoupled sectors, and the effect of preheating and related processes on their energy densities during the evolution of the universe. Over most of parameter space, preheating is not disrupted by the presence of extra sectors, and even comparatively weakly coupled sectors can get an order 1 fraction of the total energy at this time. If two sectors are both preheated, the high number densities could also lead to inflaton mediated thermalisation. If only one sector is preheated, Bose enhancement of the late time inflaton decays may cause significant deviations from the perturbative prediction for their relative reheat temperatures. Meanwhile, in Non-Oscillatory inflation models resonant effects can result in exponentially large final temperature differences between sectors that have similar couplings to the inflaton. Asymmetric reheating is potentially relevant for a range of beyond the Standard Model physics scenarios. We show that in dark matter freeze-in models, hidden sector temperatures a factor of 10 below that of the visible sector are typically needed for the relic abundance to be set solely by freeze-in dynamics.

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Energy injection and absorption in the cosmic dark ages

Cited by 142 publications

References 47 publications

Current dark matter annihilation constraints from CMB and low-redshift data

Current dark matter annihilation constraints from CMB and low-redshift data

Indirect dark matter signatures in the cosmic dark ages. I. Generalizing the bound ons-wave dark matter annihilation from Planck results

Symmetric and asymmetric reheating

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