scholarly journals The EMU view of the Large Magellanic Cloud: troubles for sub-TeV WIMPs

2021 ◽  
Vol 2021 (11) ◽  
pp. 046
Author(s):  
Marco Regis ◽  
Javier Reynoso-Cordova ◽  
Miroslav D. Filipović ◽  
Marcus Brüggen ◽  
Ettore Carretti ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Dark Matter ◽  
Cross Section ◽  
Large Magellanic Cloud ◽  
Magellanic Cloud ◽  
Annihilation Rate ◽  
Promising Target ◽  
Deep Image ◽  
Thermal Cross Section ◽  
The Universe

Abstract We present a radio search for WIMP dark matter in the Large Magellanic Cloud (LMC). We make use of a recent deep image of the LMC obtained from observations of the Australian Square Kilometre Array Pathfinder (ASKAP), and processed as part of the Evolutionary Map of the Universe (EMU) survey. LMC is an extremely promising target for WIMP searches at radio frequencies because of the large J-factor and the presence of a substantial magnetic field. We detect no evidence for emission arising from WIMP annihilations and derive stringent bounds on the annihilation rate as a function of the WIMP mass, for different annihilation channels. This work excludes the thermal cross section for masses below 480 GeV and annihilation into quarks.

scholarly journals Dark Stars: Dark matter in the first stars leads to a new phase of stellar evolution

2008 ◽  
Vol 4 (S255) ◽  
pp. 56-60 ◽  
Author(s):  
Katherine Freese ◽  
Douglas Spolyar ◽  
Anthony Aguirre ◽  
Peter Bodenheimer ◽  
Paolo Gondolo ◽  
...  
Keyword(s):  
Black Holes ◽  
Dark Matter ◽  
Cross Section ◽  
Stellar Evolution ◽  
Weakly Interacting Massive Particles ◽  
First Stars ◽  
History Of ◽  
Born Again ◽  
The Universe ◽  
New Phase

AbstractThe first phase of stellar evolution in the history of the universe may be Dark Stars, powered by dark matter heating rather than by fusion. Weakly interacting massive particles, which are their own antiparticles, can annihilate and provide an important heat source for the first stars in the the universe. This talk presents the story of these Dark Stars. We make predictions that the first stars are very massive (~800M⊙), cool (6000 K), bright (~106L⊙), long-lived (~106years), and probable precursors to (otherwise unexplained) supermassive black holes. Later, once the initial DM fuel runs out and fusion sets in, DM annihilation can predominate again if the scattering cross section is strong enough, so that a Dark Star is born again.

scholarly journals Hunting for the Dark Matter Wake Induced by the Large Magellanic Cloud

2019 ◽  
Vol 884 (1) ◽  
pp. 51 ◽  
Author(s):  
Nicolas Garavito-Camargo ◽  
Gurtina Besla ◽  
Chervin F. P. Laporte ◽  
Kathryn V. Johnston ◽  
Facundo A. Gómez ◽  
...  
Keyword(s):  
Dark Matter ◽  
Large Magellanic Cloud ◽  
Magellanic Cloud

scholarly journals The Magellanic Clouds, Past, Present and Future - A Summary of IAU Symposium No. 190

1999 ◽  
Vol 190 ◽  
pp. 569-578 ◽  
Author(s):  
Sidney van den Bergh
Keyword(s):  
Dark Matter ◽  
Large Magellanic Cloud ◽  
Magellanic Cloud ◽  
Magellanic Clouds ◽  
List Type ◽  
Type Number ◽  
Small Magellanic Cloud ◽  
Present Distribution

Important problems to which we would like to find answers are: •What are the distances to the Large Magellanic Cloud (LMC) and the Small Magellanic Cloud (SMC)?•What is the present distribution of stars, gas and dark matter in the Clouds, and how did it evolve?•How, and where, did the Magellanic Clouds form, and how have their orbits evolved?•Finally the recent discovery of numerous microlensing events in the Clouds provides answers to questions that we have only recently started to ask.

scholarly journals Implications of baryon–dark matter interaction on IGM temperature and tSZ effect with magnetic field

2020 ◽  
Vol 500 (1) ◽  
pp. 643-654
Author(s):  
Arun Kumar Pandey ◽  
Sunil Malik ◽  
T R Seshadri
Keyword(s):  
Magnetic Field ◽  
Dark Matter ◽  
Interaction Cross Section ◽  
Ionization State ◽  
Microwave Background ◽  
Magnetic Turbulence ◽  
Matter Interaction ◽  
Ionization Fraction ◽  
The Universe ◽  
The Magnetic Field

ABSTRACT We show that the combined effect of cosmic magnetic field and a possible non-standard interaction between baryons and dark matter (DM) has interesting consequences on the thermal Sunyaev−Zel’dovich (tSZ) effect depending on the temperature and the ionization state of the intergalactic medium. The drag force between the baryons and DM due to the relative velocity between them, and their temperature difference results in heat transfer between these two species. At the same time, the ambipolar diffusion and the decaying magnetic turbulence tends to heat up the baryons. This interplay of these two processes give rise to different evolution histories of the thermal and ionization state of the universe and hence influences the cosmic microwave background (CMB) spectrum at small scales through the tSZ effect. In this work, we have computed the evolution of the temperature, ionization fraction, and the y-parameter of the CMB for different strengths of the magnetic field and the interaction cross-section. We note that the y-parameter can be significantly enhanced with the inclusion of magnetic field and baryon–DM interaction as compared to the case when these are absent. The enhancement depends on the strength of the magnetic field.

scholarly journals MAGNETIC FIELD STRUCTURE OF THE LARGE MAGELLANIC CLOUD FROM FARADAY ROTATION MEASURES OF DIFFUSE POLARIZED EMISSION

2012 ◽  
Vol 759 (1) ◽  
pp. 25 ◽  
Author(s):  
S. A. Mao ◽  
N. M. McClure-Griffiths ◽  
B. M. Gaensler ◽  
M. Haverkorn ◽  
R. Beck ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Faraday Rotation ◽  
Large Magellanic Cloud ◽  
Field Structure ◽  
Magellanic Cloud ◽  
Magnetic Field Structure ◽  
Polarized Emission

scholarly journals GUT-constrained supersymmetry and dark matter in light of the new (g − 2)μ determination

2021 ◽  
Vol 2021 (5) ◽  
Author(s):  
Manimala Chakraborti ◽  
Leszek Roszkowski ◽  
Sebastian Trojanowski
Keyword(s):  
Dark Matter ◽  
Boundary Conditions ◽  
Phenomenological Models ◽  
Cross Section ◽  
Direct Detection ◽  
The Other ◽  
Total Density ◽  
Particle Spectra ◽  
Susy Models ◽  
The Universe

Abstract The recent confirmation by the Fermilab-based Muon g-2 experiment of the (g − 2)μ anomaly has important implications for allowed particle spectra in softly broken supersymmetry (SUSY) models with neutralino dark matter (DM). Generally, the DM has to be quite light, with the mass up to a few hundred GeV, and bino-dominated if it is to provide most of DM in the Universe. Otherwise, a higgsino or wino dominated DM is also allowed but only as a strongly subdominant component of at most a few percent of the total density. These general patterns can easily be found in the phenomenological models of SUSY but in GUT-constrained scenarios this proves much more challenging. In this paper we revisit the issue in the framework of some unified SUSY models with different GUT boundary conditions on the soft masses. We study the so-called non-universal gaugino model (NUGM) in which the mass of the gluino is disunified from those of the bino and the wino and an SO(10) and an SU(5) GUT-inspired models as examples. We find that in these unified frameworks the above two general patterns of DM can also be found, and thus the muon anomaly can also be accommodated, unlike in the simplest frameworks of the CMSSM or the NUHM. We show the resulting values of direct detection cross-section for points that do and do not satisfy the muon anomaly. On the other hand, it will be challenging to access those solutions at the LHC because the resulting spectra are generally very compressed.

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