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

Abstract

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 gamma rays 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.

7 pages, 3 figures. Comments still welcome!!

References in corpus (5)

• Calculation of atmospheric neutrino flux using the interaction model calibrated with atmospheric muon data
• Generalised constraints on the curvature perturbation from primordial black holes
• Minimally Parametric Power Spectrum Reconstruction from the Lyman-alpha Forest
• Gamma-rays from ultracompact minihalos: potential constraints on the primordial curvature perturbation
• Muon Fluxes From Dark Matter Annihilation

Cited by in corpus (25)

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• Are ultracompact minihalos really ultracompact?
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• Reheating the Universe Once More: The Dissipation of Acoustic Waves as a Novel Probe of Primordial Inhomogeneities on Even Smaller Scales
• Investigating dark matter substructure with pulsar timing: I. Constraints on ultracompact minihalos
• 3D simulations with boosted primordial power spectra and ultracompact minihalos
• Predicting the density profiles of the first halos
• Constraints on small-scale primordial power by annihilation signals from extragalactic dark matter minihalos
• Investigating dark matter substructure with pulsar timing: II. Improved limits on small-scale cosmology
• Observational Constraints on the Primordial Curvature Power Spectrum
• Constraints on primordial black holes and curvature perturbations from the global 21cm signal
• Cosmic ray $e^{+}{e}^{-}$ spectrum excess and peak feature observed by the DAMPE experiment from dark matter
• The abundance of primordial black holes from the global 21cm signal and extragalactic gamma-ray background
• The 21-cm signals from ultracompact minihalos as a probe of primordial small-scale fluctuations
• Constraints on cosmic strings from ultracompact minihalos
• WIMP isocurvature perturbation and small scale structure
• Constraints on the small scale curvature perturbation using Planck-2015 data
• Minihalos as probes of the inflationary spectrum: accurate boost factor calculation and new CMB constraints
• Constraints on the primordial power spectrum of small scales using the neutrino signals from the dark matter decay
• Constraints on the ultracompact minihalos using neutrino signals from the gravitino dark matter decay
• Tau neutrinos from ultracompact dark matter minihalos and constraints on the primordial curvature perturbations
• How large are curvature perturbations from slow first-order phase transitions? A gauge-invariant analysis
• Updated constraints on the primordial power spectrum at sub-Mpc scales