Dark Matter searches status as of 2015

Cirelli, Marco

doi:10.22323/1.263.0026

Cited by 5 publications

(7 citation statements)

References 51 publications

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“…A "patchwork" of different solutions has been suggested to explain subsets of the features (i)-(vi). Additional sources of primary positrons such as pulsars [13], or annihilations or decays of dark matter [14] may explain the observed positron excess (iii). Uncertainties of the antiproton production cross-section and of CR propagation models are invoked to relieve the problem (iv) [15].…”

Section: Introductionmentioning

confidence: 99%

Cosmic ray signatures of a 2–3 Myr old local supernova

Kachelrieß¹,

Neronov

Semikoz

2018

Phys. Rev. D

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The supernova explosion which deposited 60 Fe isotopes on Earth 2-3 million years ago should have also produced cosmic rays which contribute to the locally observed cosmic ray flux. We show that the contribution of this "local source" causes the "anomalies" observed in the positron and antiproton fluxes and explains why their spectral shapes agree with that of the proton flux. At the same time, this local source component accounts for the difference in the slopes of the spectra of cosmic ray nuclei as the result of the slightly varying relative importance of the "local" and the average component for distinct CR nuclei. Such a "local supernova" model for the spectra of nuclei can be tested via a combined measurement of the energy dependence of the boron-to-carbon (primaryto-secondary cosmic rays) ratio and of the antiproton spectrum: While the antiproton spectrum is predicted to extend approximately as a power law into the TeV range without any softening break, the B/C ratio is expected to show a "plateau" at a level fixed by the observed positron excess in the 30-300 GeV range. We discuss the observability of such a plateau with dedicated experiments for the measurement of the cosmic ray composition in the 10 TeV energy range (NUCLEON, ISS-CREAM).

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Section: Introductionmentioning

confidence: 99%

Cosmic ray signatures of a 2–3 Myr old local supernova

Kachelrieß¹,

Neronov

Semikoz

2018

Phys. Rev. D

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“…In addition there are direct detection experiments, which measure the nuclear-recoil energy and its spectrum in DM-nucleon elastic scattering. The indirect detection experiments look for signals of DM annihilation into Visiting researcher a e-mail: khogali11@gmail.com b e-mail: agoyal45@yaho.com c e-mail: mukesh.kumar@cern.ch d e-mail: Alan.Cornell@wits.ac.za Standard Model (SM) particles in cosmic rays, and have detection instruments mounted on satellites and ground based telescopes [3,4].…”

Section: Introductionmentioning

confidence: 99%

Minimal spin-3/2 dark matter in a simple s-channel model

et al. 2017

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We consider a spin -3/2 fermionic dark matter candidate (DM) interacting with Standard Model fermions through a vector mediator in the s-channel. We find that for pure vector couplings almost the entire parameter space of the DM and mediator mass consistent with the observed relic density is ruled out by the direct detection observations through DM-nucleon elastic scattering cross-sections. In contrast, for pure axial-vector coupling, the most stringent constraints are obtained from mono-jet searches at the Large Hadron Collider.

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“…In the left and right panels, the angle β between the los and the GC is respectively set equal to 1 • and 10 • . The DM distribution is given by the NFW profile (11). We first remark that all curves are flat over a significant portion of the mediator mass range, starting from 0.1 GeV upward.…”

Section: The Gamma Ray J-factor In the Presence Of Mediator Dark Mmentioning

confidence: 86%

“…[9] and AMS [10] collaborations. This forms the basis for indirect detection searches, as recently summarized in [11,12]. Theoretical predictions for signals at indirect detection experiments depend on the underlying particle physics model, the DM density at the annihilation point and the understanding of cosmic ray propagation.…”

Section: Introductionmentioning

confidence: 99%

Dark matter indirect signals with long-lived mediators

Chu

Kulkarni

Salati

2017

J. Cosmol. Astropart. Phys.

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Dark matter particles could annihilate into light and metastable mediators subsequently decaying far away from where they are produced. In this scenario, the indirect signatures of dark matter are altered with respect to the conventional situation where standard model particles are directly injected where annihilation happens. We revisit the long-lived particle proposal (Rothstein et al., 2009) and devise the tools to explore this new phenomenology.We calculate the effective dark matter distribution resulting from the smearing by mediator propagation. We derive general expressions for the fluxes of mediators and their decay particles. We study how the J-factor, which naturally appears in the calculation of the dark matter induced gamma ray signal, is modified in the presence of mediators. We also derive the anisotropy which the cosmic ray positron flux exhibits in this scenario. We finally comment upon a recent proposal based on long-lived mediators where the effective dark matter density at the Earth is increased such as to explain the cosmic ray positron anomaly.We conclude that this scenario is barely tenable as regards the very dense dark matter spike which it requires at the Galactic center. The associated positron anisotropy is very small and undetectable, except at high energies where it reaches a level of order 10 −4 to 10 −based on non-relativistic long-lived mediators, observations of the gamma ray emission from the GC no longer preclude the large values of the WIMP annihilation cross section required to explain the cosmic ray positron excess. The other difference lies in the small mass and high energy of the mediators. In general, these particles are relativistic at the time of annihilation and lead to anisotropic distributions of cosmic rays. In this paper, we set up the formalism for computing the fluxes and associated anisotropies of the prompt species -positrons and photons -produced in the decays of these long-lived mediators.The paper is organized as follows. In section II A, we show how the DM density profile is smeared by mediators and compute the production rate of SM particles yielded by mediator decay.The conventional situation is recovered if the DM density is replaced by an effective value which depends on the mediator properties. In the scenario proposed by [14] to explain the cosmic ray positron excess, the effective DM density at the Earth is exceedingly large with respect to its actual value. The price to pay for such an enhancement is the existence of a very dense DM spike at the GC. In section II B we ponder upon possible astrophysical mechanisms which can alter the Galactic density profiles and show that adiabatic contraction resulting from the formation of the GC black hole can marginally lead to the desired DM density. In section III, we build the formalism for computing the fluxes of mediators and prompt decay particles. The observable flux of gamma rays is then described by an effective J-factor, which, for very long-lived mediators, considerably differs from the canonical one. ...

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Dark Matter searches status as of 2015

Abstract: This article summarizes the status of the Indirect and Direct searches for Dark Matter, with a special focus and a critical look on the former.

Cited by 5 publications

References 51 publications

Cosmic ray signatures of a 2–3 Myr old local supernova

Cosmic ray signatures of a 2–3 Myr old local supernova

Minimal spin-3/2 dark matter in a simple s-channel model

Dark matter indirect signals with long-lived mediators

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