Constraints on ultracompact minihalos from extragalactic γ-ray background

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

doi:10.1088/1475-7516/2011/12/020

Cited by 39 publications

(64 citation statements)

References 42 publications

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“…In Refs. [7,8,19], the authors have investigated the γ-ray flux from the nearby and extra-Galactic UCMHs. Besides these high energy photons, the neutrinos would be produced together with the γ-ray in the process of dark matter annihilation.…”

Section: B Neutrino Signals From Nearby Ucmhsmentioning

confidence: 99%

“…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]. The other kind of important product of dark matter annihilation is the neutrino.…”

Section: Introductionmentioning

confidence: 99%

“…In this paper, different from Refs. [7][8][9] where the authors have focused on the gamma-ray flux, we will investigate the potential neutrino signals from the UCMHs due to dark matter annihilation.…”

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%

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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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“…[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]. The authors of Refs.…”

mentioning

confidence: 99%

“…In Ref. [9], the authors investigated the contributions of UCMHs to the extragalactic gamma-ray background and found that the constraints increase with the dark matter mass: f UCMHs ∼ 10 −5 and ∼ 10 −3 for the dark matter mass M χ ∼ 10GeV and ∼ 1TeV, respectively. These constraints are stronger than the results obtained from the CMB data by about one orp-1 der of magnitude (see the Fig.…”

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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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Status of dark matter detection

Yin

Yuan

2013

Front. Phys.

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The detection of dark matter has made great progresses in recent years. We give a brief review on the status and progress in dark matter detection, including the progresses in direct detection, collider detection at LHC and focus on the indirect detection. The results from PAMELA, ATIC, Fermi-LAT and relevant studies on these results are introduced. Then we give the progress on indirect detection of gamma rays from Fermi-LAT and ground based Cerenkov telescopes. Finally the detection of neutrinos and constraints on the nature of dark matter are reviewed briefly. PACS numbers: 12.60.Jv,14.80.Ly Indirect detection DM DM SM SM New Physics Collider detection Direct detection High energy photon, neutrino, anti-matter Missing transverse energy Nuclear recoil FIG. 1: Schematic plot to show the relation among the direct detection, indirect detection and collider detection of DM. The arrows indicate the direction of reaction.

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Constraints on ultracompact minihalos from extragalactic γ-ray background

Cited by 39 publications

References 42 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

Status of dark matter detection

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