New constraints on primordial minihalo abundance using cosmic microwave background observations

Yang, Yupeng; Huang, Xiaoyuan; Chen, Xuelei; Zong, Hong-Shi

doi:10.1103/physrevd.84.043506

Cited by 28 publications

(49 citation statements)

References 28 publications

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“…The annihilation rate of dark matter is proportional to the number density squared, Γ ∼ n 2 σv = ρ 2 σv /m 2 , so the UCMHs have very significant effect on the cosmological evolution [5,6,8]. In Refs.…”

Section: B Neutrino Signals From Nearby Ucmhsmentioning

confidence: 99%

“…Compared with classical dark matter halos, the formation time of these objects is earlier and the density profile is steeper. So it is expected that these new interesting structures would have an effect on the cosmological evolution, such as reionization and recombination, due to the dark matter annihilation within them if the dark matter is composed of weakly interacting massive particles (WIMP) [4][5][6], such as neutralinos. According to the theory, dark matter can annihilate into the standard particles, such as photons(γ), electrons and positrons(e + , e − ), and UCMHs would become one kind of possible high energy astrophysical sources, such as γ-ray sources [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

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Neutrino signals from ultracompact minihalos and constraints on the primordial curvature perturbation

Yang

Zong

2013

Phys. Rev. D

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Compared with that of standard dark matter halos, the density profile of the recently proposed new kind of dark matter structure named ultracompact minihalos (UCMHs) is steeper and its formation time is earlier. If the dark matter is composed of weakly interactive massive particles (WIMP), the potential signals, e.g. neutrinos, from UCMHs due to the dark matter annihilation would be detected by IceCube/DeepCore or other detectors and such signals would have a very useful complementarity of γ-ray observations. On the other hand, the formation of UCMHs is related to primordial curvature perturbations on the smaller scales. So constraints on the abundance of UCMHs can be used to give a limit on the perturbations on these scales. In previous works in the literature, the authors focused on the γ-ray signals from UCMHs due to dark matter annihilation. In this work, we investigate the neutrino signals from nearby UCMHs. Although no excess of neutrino signals the dark matter annihilation has been observed, the constraints on the abundance of UCMHs can be obtained and these constraints can be translated into the limit on the primordial curvature perturbations on small scales.

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Section: B Neutrino Signals From Nearby Ucmhsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Neutrino signals from ultracompact minihalos and constraints on the primordial curvature perturbation

Yang

Zong

2013

Phys. Rev. D

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“…In Refs. [3][4][5], the authors studied the impact of UCMHs on the cosmological ionization and obtained the constraints on the abundance of them. If high energy photons are produced by the dark matter annihilation, the UCMHs will become one kind of astrophysical sources and they can contribute to the γ-ray background [6][7][8][9][10][11][12].…”

mentioning

confidence: 99%

Dark-matter decay and the abundance of ultracompact minihalos

Yang¹,

Yang²,

Zong³

2013

EPL

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-Dark matter, dark matter decay and dark matter halos PACS 98.80.Cq -Early Universe, dark matter halos are formed in the early universe Abstract -Ultracompact minihalos would be formed if there are larger density perturbations (0.0003 < δρ/ρ < 0.3) in the earlier epoch. The density profile of them is steeper than the standard dark matter halos. If the dark matter can annihilate or decay into the standard particles, e.g., photons, these objects would be the potential astrophysical sources. In order to be consistent with the observations, such as F ermi, the abundance of ultracompact minihalos must be constrained. On the other hand, the formation of these objects has very tight relation with the primordial curvature perturbations on smaller scale, so the fraction of ultracompact minihalos is very important for modern cosmology. In previous works, the studies are focused on the dark matter annihilation for these objects. But if the dark matter is not annihilated, the dark matter decay is another important possible case. On the other hand, the abundance of ultracompact minihalos is related to many other parameters, such as the mass of dark matter, the decay channels and the density profile of dark matter halo. One of the important aspects of this work is that we investigate the γ-ray signals from nearby ultracompact minihalos due to dark matter decay and another important aspect is to study in detail how the different decay channels and density profiles affect the constraints on the abundance of ultracompact minihalos.Introduction. -The structure formation is one of the important fields of modern cosmology. It is well known that the present structures of our observational cosmos come from the earlier density perturbations which is produced during the inflation. The amplitude of these density perturbations are δρ/ρ ∼ 10 −5 . If the density perturbations at earlier epoch are larger than 0.3, the primordial black holes (PBHs) would be formed [1]. Recently, Ricotti and Gould proposed that if the density perturbations are larger than 10 −3 1 but smaller than 0.3, one new kind of dark matter structure called ultracompact minihalos (UCMHs) would be formed [2]. The formation time of these objects is earlier and the density is larger than the standard dark matter halos. If the dark matter particles consist of weakly interacting massive parti-

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“…[6], χ i = (1 − x e )/3. It should be noticed that although this form has been used frequently in previous works [6][7][8]10], it is not accurate. In the Ref.…”

Section: The Impact Of Dm On the Evolution Of The Universe And Comentioning

confidence: 99%

“…For example, the photons produced through DM annihilation can ionize the hydrogens formed in the epoch of recombination before appearance of the first stars. The changes of the ionization will be reflected in the anisotropy of the cosmic microwave background (CMB) [7][8][9][10][11]. Therefore the observation data of CMB can be used to investigate the nature of DM particles.…”

Section: Introductionmentioning

confidence: 99%

Constraints on the basic parameters of dark matter using the Planck data

Yang

2015

Phys. Rev. D

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Dark Matter annihilation or decay can affect the anisotropy of the cosmic microwave background (CMB). Therefore the CMB data can be used to constrain the properties of dark matter particle. In this work, we use the new CMB data obtained by the Planck satellite to investigate the limits on the basic parameters of dark matter particle. The parameters are the dark matter mass (mχ) and the thermally averaged cross section ( σv ) for dark matter annihilation and the decay rate (Γ) (or life time τ = 1/Γ) for dark matter decay. For dark matter annihilation we also consider the impact of the structure formation process which is neglected by the recent work. We found that for DM annihilation the constraints on the parameters are fann = σv /mχ < 0.16 × 10 −26 cm 3 s −1 GeV −1 (or fann < 0.89 × 10 −6 m 3 s −1 kg −1 , 95% CL). For DM decay the constraints on the decay rate are Γ < 0.28 × 10 −25 s −1 (95% CL).

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New constraints on primordial minihalo abundance using cosmic microwave background observations

Cited by 28 publications

References 28 publications

Neutrino signals from ultracompact minihalos and constraints on the primordial curvature perturbation

Neutrino signals from ultracompact minihalos and constraints on the primordial curvature perturbation

Dark-matter decay and the abundance of ultracompact minihalos

Constraints on the basic parameters of dark matter using the Planck data

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