Dark matter phenomena

Cirelli, Marco

doi:10.22323/1.236.0014

Cited by 10 publications

(6 citation statements)

References 60 publications

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“…What is more, the properties of the DM are still unknown, so one can make a wide range of assumptions. However, models of decaying or annihilating Dark Matter particles are still subject to the set of constraints, such as ones set by CMB (Cosmic Microwave Background) or gamma-rays from Dwarf Galaxies [14].…”

Section: Positron Anomaly Of Pamela and Ams-02mentioning

confidence: 99%

Indirect effects of dark matter

Belotskiy

Esipova

Kamaletdinov

et al. 2019

Int. J. Mod. Phys. D

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Here we briefly review possible indirect effects of dark matter (DM) of the Universe. It includes effects in cosmic rays (CR): first of all, the positron excess at ∼ 500 GeV and possible electron-positron excess at 1-1.5 TeV. We tell that the main and least model-dependent constraint on such possible interpretation of CR effects goes from gamma-ray background. Even ordinary e + e − mode of DM decay or annihilation produces prompt photons (FSR) so much that it leads to contradiction with data on cosmic gamma-rays. We present our attempts to possibly avoid gamma-ray constraint. They concern peculiarities of both space distribution of DM and their physics. The latter involves complications of decay/annihilation modes of DM, modifications of Lagrangian of DM-ordinary matter interaction, and inclusion of mode with identical fermions in final state. In this way, no possibilities to suppress were found yet except, possibly, mode with identical fermions. While the case of spatial distribution variation allows achieving consistency between different data. Also we consider stable form of dark matter which can interact with baryons. We show which constraint such DM candidate can get from damping effect in plasma during large scale structure formation in comparison with other existing constraints.

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Section: Positron Anomaly Of Pamela and Ams-02mentioning

confidence: 99%

Indirect effects of dark matter

Belotskiy

Esipova

Kamaletdinov

et al. 2019

Int. J. Mod. Phys. D

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“…This excess was found to be extended with consistent spectral characteristics within ≈ 15 • around the GC [50]. Several explanations for the excess have been proposed, as an unresolved population of millisecond pulsars [51], recurring outbursts from Sgr A * [52] and Dark Matter annihilation [5]. However, given the uncertainties mentioned before, our current knowledge of the cosmic-ray distribution in the galactic centre is not good enough to robustly confirm or refute these ideas.…”

Section: The Galactic Centrementioning

confidence: 92%

“…It is publicly available and can be run from a web interface 4 . Over the recent years two new codes are being developed, PICARD [23,22] and DRAGON [48,33]; the latter is also publicly available 5 . The aim of these codes is to make propagation models increasingly realistic; for instance, by taking into account the spiral-arm structure of gas in the Milky Way.…”

Section: Cosmic-ray Propagation Codesmentioning

confidence: 99%

“…To make the report more complete, some results obtained in the past few years which were not shown at this conference were also included. Accompanying articles will give a status report of related topics in cosmic-ray research based on the contributions in this conference: Ground-based gamma-ray astronomy [2], Solar and heliospheric phenomena [3], Neutrino Astronomy [4], Indirect Dark Matter searches [5], Cosmic rays: direct measurements [7], Cosmic rays: air showers from low to high energies [6].…”

Section: Introductionmentioning

confidence: 99%

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Space-based gamma-ray astronomy

Buehler¹

2016

Proceedings of the 34th International Cosmic Ray Conference — PoS(ICRC2015)

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Gamma-ray observations give us a direct view into the most extreme environments of the universe. They help us to study astronomical particle accelerators as supernovae remnants, pulsars, active galaxies or gamma-ray bursts and help us to understand the propagation of cosmic rays through our Milky Way. This article summarizes the status of gamma-ray observations from space; it is the write-up of a rapporteur talk given at the 34 th ICRC in The Hague, The Netherlands. The primary instrument used in the presented studies is the Large Area Telescope on-board the Fermi Spacecraft, which images the whole gamma-ray sky at photon energies between 20 MeV and 2 TeV. The Fermi mission is currently in its 8 th year of observations. This article will review many of the exciting discoveries made in this time, focusing on the most recent ones.Space based gamma-ray astronomy 1 The slides of the rapporteur talk can be found under http://www.rolfbuehler.net/files/buehler_spacegamma.pdf 2 The Astro-rivelatore Gamma a Immagini Leggero (AGILE) satellite mission observing the sky at similar photon energies suffered a malfunction to the reaction wheel in November 2009, and has only been observing parts of the sky at reduced sensitivity since then. No contributions from the AGILE collaboration were submitted at the 34 th ICRC.3 http://www.slac.stanford.edu/exp/glast/groups/canda/lat_Performance.htm dN p,e,γ dE = N 0 E −Γ p,e,γ , where N 0 is a normalization factor. In cosmic-ray interactions with interstellar gas on average a fraction of the energy of the primary is transferred to gamma rays: E γ ≈ 0.1 − 0.3E p,e ). The spectral slope of the gamma-ray spectrum resulting

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“…This will constrain a possible contribution to this excess from decaying dark matter (e.g. [618][619][620]). (See also Section 2.7.)…”

Section: Muwclass: An Automated Multiwavelength Machine Learning Clas...mentioning

confidence: 99%

The Future of Gamma-Ray Experiments in the MeV-EeV Range

Engel¹,

Goodman²,

Huentemeyer³

et al. 2022

Preprint

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Naturally occurring particle accelerators shine brightly throughout the universe, inviting us to discover fundamental laws and hone our theories if we look in their directions with the right detectors. Gamma-rays, the most energetic photons, carry information from the far reaches of extragalactic space with minimal interaction or loss of information. They bring messages about particle acceleration in environments so extreme they cannot be reproduced on earth for a closer look. Gamma-ray astrophysics is so complementary with collider work that particle physicists and astroparticle physicists are often one in the same.Gamma-ray instruments, especially the Fermi Gamma-ray Space Telescope, have been pivotal in major multi-messenger discoveries over the past decade. There is presently a great deal of interest and scientific expertise available to push forward new technologies, to plan and build space-and ground-based gamma-ray facilities, and to build multimessenger networks with gamma rays at their core. It is therefore concerning that before the community comes together for planning exercises again, much of that infrastructure could be lost to a lack of long-term planning for support of gamma-ray astrophysics. Gamma-rays with energies from the MeV to the EeV band are therefore central to multiwavelength and multi-messenger studies to everything from astroparticle physics with compact objects, to dark matter studies with diffuse large scale structure.These science goals and the excitement of new discoveries have generated a wave of new gamma-ray facility proposals and programs. Since the legacy of existing facilities is well covered in many other places, this paper highlights new and proposed gamma-ray technologies and facilities that have each been designed to address specific needs in the measurement of extreme astrophysical sources that probe some of the most pressing questions in fundamental physics for the next decade. The proposed instrumentation would also address the priorities laid out in the recent Decadal Survey of Astronomy and Astrophysics (Astro2020), a complementary study by the astrophysics community that provides opportunities also relevant to Snowmass.

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Dark matter phenomena

Cited by 10 publications

References 60 publications

Indirect effects of dark matter

Indirect effects of dark matter

Space-based gamma-ray astronomy

The Future of Gamma-Ray Experiments in the MeV-EeV Range

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