Constraints on ultracompact minihalos from extragalactic γ-ray background

Abstract

It has been proposed that ultracompact minihalos (UCMHs) might be formed in earlier epoch. If dark matter consists of Weakly Interacting Massive Particles (WIMPs), UCMHs can be treated as the γ-ray sources due to dark matter annihilation within them. In this paper, we investigate the contributions of UCMHs formed during three phase transi- tions (i.e., electroweak symmetry breaking, QCD confinement and e+ e- annihilation) to the extragalactic γ-ray background. Moreover, we use the Fermi-LAT observation data of the extragalactic γ-ray background to get the constraints on the current abundance of UCMHs produced during these phase transitions. We also compare these results with those obtained from Cosmic Microwave Background (CMB) observations and find that the constraints from the Fermi-LAT are more stringent than those from CMB

13 pages, 4 figures, 1 table

References in corpus (11)

• Observation of an anomalous positron abundance in the cosmic radiation
• Three Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Polarization Analysis
• Measurement of the Cosmic Ray e+ plus e- spectrum from 20 GeV to 1 TeV with the Fermi Large Area Telescope
• The Spectrum of the Isotropic Diffuse Gamma-Ray Emission Derived From First-Year Fermi Large Area Telescope Data
• CMB Constraints on WIMP Annihilation: Energy Absorption During the Recombination Epoch
• Updated CMB constraints on Dark Matter annihilation cross-sections
• The impacts of dark matter particle annihilation on recombination and the anisotropies of the cosmic microwave background
• Gamma-rays from ultracompact minihalos: potential constraints on the primordial curvature perturbation
• The Extragalactic Gamma Ray Background
• New Constraints on Primordial Minihalo Abundance Using Cosmic Microwave Background Observations
• The Abundance of New Kind of Dark Matter Structures

Cited by in corpus (27)

• Testing scenarios of primordial black holes being the seeds of supermassive black holes by ultracompact minihalos and CMB $\mu$-distortions
• Observable Spectra of Induced Gravitational Waves from Inflation
• Density profiles of ultracompact minihalos: Implications for constraining the primordial power spectrum
• A new probe of the small-scale primordial power spectrum: astrometric microlensing by ultracompact minihalos
• Small-scale clumps of dark matter
• Are ultracompact minihalos really ultracompact?
• Formation and internal structure of superdense dark matter clumps and ultracompact minihaloes
• Investigating dark matter substructure with pulsar timing: I. Constraints on ultracompact minihalos
• Number Counts and Non-Gaussianity
• Ultracompact minihalos as probes of inflationary cosmology
• Constraints on Dark Matter Annihilation/Decay from the Isotropic Gamma-Ray Background
• Neutrino signals from ultracompact minihalos and constraints on the primordial curvature perturbation
• Investigating dark matter substructure with pulsar timing: II. Improved limits on small-scale cosmology
• Observational Constraints on the Primordial Curvature Power Spectrum
• The contribution of ultracompact dark matter minihalos to the isotropic radio background
• The DAMPE excess and gamma-ray constraints
• Hunting for dark halo substructure using submilliarcsecond-scale observations of macrolensed radio jets
• The abundance of primordial black holes from the global 21cm signal and extragalactic gamma-ray background
• Dark Matter Decay and the Abundance of Ultracompact Minihalos
• The 21-cm signals from ultracompact minihalos as a probe of primordial small-scale fluctuations
• Boosting small-scale structure via primordial black holes and implications for sub-GeV dark matter annihilation
• Constraints on cosmic strings from ultracompact minihalos
• Constraints on small-scale primordial density fluctuation from cosmic microwave background through dark matter annihilation
• Constraints on ultracompact minihalos from the extragalactic gamma-ray background observation
• Cosmological contribution from population III stars in ultracompact minihalos
• Cosmological abundance of primordial black holes in mixed dark matter scenarios incorporating Kaluza-Klein dark matter
• CMB lensing from early-formed dark matter halos