scholarly journals Upper limits on dark matter annihilation cross sections from the first AMS-02 antiproton data

2015 ◽  
Vol 92 (5) ◽  
Author(s):  
Hong-Bo Jin ◽  
Yue-Liang Wu ◽  
Yu-Feng Zhou
Keyword(s):  
Dark Matter ◽  
Cross Sections ◽  
Dark Matter Annihilation ◽  
Upper Limits

scholarly journals A novel scheme for Dark Matter Annihilation Feedback in cosmological simulations

2019 ◽  
Vol 489 (3) ◽  
pp. 4217-4232 ◽  
Author(s):  
Florian List ◽  
Nikolas Iwanus ◽  
Pascal J Elahi ◽  
Geraint F Lewis
Keyword(s):  
Dark Matter ◽  
Blast Wave ◽  
Cross Sections ◽  
Injection Velocity ◽  
Local Energy ◽  
Time Step ◽  
Dark Matter Annihilation ◽  
Self Consistent ◽  
Consistent Method ◽  
Non Local

ABSTRACT We present a new self-consistent method for incorporating Dark Matter Annihilation Feedback (DMAF) in cosmological N-body simulations. The power generated by DMAF is evaluated at each dark matter (DM) particle which allows for flexible energy injection into the surrounding gas based on the specific DM annihilation model under consideration. Adaptive, individual time-steps for gas and DM particles are supported and a new time-step limiter, derived from the propagation of a Sedov–Taylor blast wave, is introduced. We compare this donor-based approach with a receiver-based approach used in recent studies and illustrate the differences by means of a toy example. Furthermore, we consider an isolated halo and a cosmological simulation and show that for these realistic cases, both methods agree well with each other. The extension of our implementation to scenarios such as non-local energy injection, velocity-dependent annihilation cross-sections, and DM decay is straightforward.

scholarly journals DARK MATTER ANNIHILATION IN THE GRAVITATIONAL FIELD OF A BLACK HOLE

2009 ◽  
Vol 18 (08) ◽  
pp. 1195-1203 ◽  
Author(s):  
ANTON BAUSHEV
Keyword(s):  
Black Hole ◽  
Dark Matter ◽  
Gravitational Field ◽  
Cross Sections ◽  
Collision Energy ◽  
Dark Matter Particle ◽  
Particle Collision ◽  
Dark Matter Annihilation ◽  
Exact Distribution Function ◽  
Very High

In this paper we consider dark matter particle annihilation in the gravitational field of black holes. We obtain the exact distribution function of the infalling dark matter particles, and compute the resulting flux and spectra of gamma rays coming from the objects. It is shown that the dark matter density significantly increases near a black hole. Particle collision energy becomes very high, affecting relative cross-sections of various annihilation channels. We also discuss possible experimental consequences of these effects.

scholarly journals Recasting direct detection limits within micrOMEGAs and implication for non-standard dark matter scenarios

2021 ◽  
Vol 81 (3) ◽  
Author(s):  
G. Bélanger ◽  
A. Mjallal ◽  
A. Pukhov
Keyword(s):  
Dark Matter ◽  
Elastic Scattering ◽  
Velocity Distribution ◽  
Cross Sections ◽  
Direct Detection ◽  
Cosmological Parameters ◽  
Form Factors ◽  
Scattering Cross ◽  
Upper Limits ◽  
Scattering Cross Sections

AbstractDirect detection experiments obtain 90% upper limits on the elastic scattering cross sections of dark matter with nucleons assuming point-like interactions and standard astrophysical and cosmological parameters. In this paper we provide a recasting of the limits from XENON1T, PICO-60, CRESST-III and DarkSide-50 and include them in micrOMEGAs. The code can then be used to directly impose constraints from these experiments on generic dark matter models under different assumptions about the DM velocity distribution or on the nucleus form factors. Moreover, new limits on the elastic scattering cross sections can be obtained in the presence of a light t-channel mediator or of millicharged particles.

scholarly journals Bounds on dark matter annihilation cross-sections from inert doublet model in the context of 21-cm cosmology of dark ages

2021 ◽  
pp. 2150163
Author(s):  
Rupa Basu ◽  
Madhurima Pandey ◽  
Debasish Majumdar ◽  
Shibaji Banerjee
Keyword(s):  
Dark Matter ◽  
Cross Sections ◽  
Mass Range ◽  
Mass Region ◽  
High Mass ◽  
Dark Matter Annihilation ◽  
Dark Ages ◽  
Doublet Model ◽  
Inert Doublet Model ◽  
Text Signal

We study the fluctuations in the brightness temperature of 21-cm signal [Formula: see text] at the dark ages ([Formula: see text]) with a dark matter (DM) candidate in Inert Doublet Model (IDM). We then explore the effects of different fractions of IDM DM on [Formula: see text] signal. The IDM DM masses are chosen in few tens of GeV region as well as in the high mass region beyond 500 GeV. It has been observed that the [Formula: see text] signal is more sensitive in the DM mass range of 70–80 GeV. A lower bound on annihilation cross-section for this DM is also obtained by analyzing the [Formula: see text] signal. This is found to lie within the range [Formula: see text] cm3/s for the IDM DM mass range 10 GeV[Formula: see text] GeV.

scholarly journals Gamma-Ray Effects of Dark Forces in Dark Matter Clumps

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
K. Belotsky ◽  
M. Khlopov ◽  
A. Kirillov
Keyword(s):  
Dark Matter ◽  
Cross Sections ◽  
Gamma Ray ◽  
Mass Density ◽  
Diffuse Radiation ◽  
Interaction Constant ◽  
Small Scale ◽  
Annihilation Rate ◽  
Dark Matter Annihilation ◽  
Ray Effects

Existence of new gauge U(1) symmetry possessed by dark matter (DM) particles implies the existence of a new Coulomb-like interaction, which leads to Sommerfeld-Gamow-Sakharov enhancement of dark matter annihilation at low relative velocities. We discuss a possibility to put constraints on such dark forces of dark matter from the observational data on the gamma radiation in our Galaxy. Gamma-rays are supposed to originate from annihilation of DM particles in the small scale clumps, in which annihilation rate is supposed to be enhanced, besides higher density, due to smaller relative velocitiesvof DM particles. For possible cross sections, mass of annihilating particles, masses of clumps, and the contribution of annihilating particles in the total DM density we constrain the strength of new dark long range forces from comparison of predicted gamma-ray signal with Fermi/LAT data on unidentified point-like gamma-ray sources (PGS) as well as on diffuseγ-radiation. Both data on diffuse radiation and data on PGS put lower constraints on annihilation cross section at any dark interaction constant, where diffuse radiation provides stronger constraint at smaller clump mass. Density of annihilating DM particles is conventionally supposed to be defined by the frozen annihilation processes in early Universe.

scholarly journals New Projections for Dark Matter Searches with Paleo-Detectors

Instruments ◽  
2021 ◽  
Vol 5 (2) ◽  
pp. 21
Author(s):  
Sebastian Baum ◽  
Thomas D. P.  Edwards ◽  
Katherine Freese ◽  
Patrick Stengel
Keyword(s):  
Dark Matter ◽  
Cross Sections ◽  
Direct Detection ◽  
Small Samples ◽  
Recoil Energy ◽  
Analysis Technique ◽  
Upper Limits ◽  
Nuclear Recoils ◽  
Microscopy Techniques ◽  
Nuclear Damage

Paleo-detectors are a proposed experimental technique to search for dark matter (DM). In lieu of the conventional approach of operating a tonne-scale real-time detector to search for DM-induced nuclear recoils, paleo-detectors take advantage of small samples of naturally occurring rocks on Earth that have been deep underground (≳5 km), accumulating nuclear damage tracks from recoiling nuclei for O(1)Gyr. Modern microscopy techniques promise the capability to read out nuclear damage tracks with nanometer resolution in macroscopic samples. Thanks to their O(1)Gyr integration times, paleo-detectors could constitute nuclear recoil detectors with keV recoil energy thresholds and 100 kilotonne-yr exposures. This combination would allow paleo-detectors to probe DM-nucleon cross sections orders of magnitude below existing upper limits from conventional direct detection experiments. In this article, we use improved background modeling and a new spectral analysis technique to update the sensitivity forecast for paleo-detectors. We demonstrate the robustness of the sensitivity forecast to the (lack of) ancillary measurements of the age of the samples and the parameters controlling the backgrounds, systematic mismodeling of the spectral shape of the backgrounds, and the radiopurity of the mineral samples. Specifically, we demonstrate that even if the uranium concentration in paleo-detector samples is 10−8 (per weight), many orders of magnitude larger than what we expect in the most radiopure samples obtained from ultra basic rock or marine evaporite deposits, paleo-detectors could still probe DM-nucleon cross sections below current limits. For DM masses ≲ 10 GeV/c2, the sensitivity of paleo-detectors could still reach down all the way to the conventional neutrino floor in a Xe-based direct detection experiment.

scholarly journals A Dark Matter WIMP That Can Be Detected and Definitively Identified with Currently Planned Experiments

Universe ◽  
2021 ◽  
Vol 7 (8) ◽  
pp. 270
Author(s):  
Caden LaFontaine ◽  
Bailey Tallman ◽  
Spencer Ellis ◽  
Trevor Croteau ◽  
Brandon Torres ◽  
...  
Keyword(s):  
Dark Matter ◽  
Cross Section ◽  
Cross Sections ◽  
Direct Detection ◽  
Vector Boson ◽  
Massive Particle ◽  
Current Evidence ◽  
Channel Cross Section ◽  
Dark Matter Annihilation ◽  
The Cross

A recently proposed dark matter WIMP (weakly interacting massive particle) has only second-order couplings to gauge bosons and itself. As a result, it has small annihilation, scattering, and creation cross-sections, and is consequently consistent with all current experiments and the observed abundance of dark matter. These cross-sections are, however, still sufficiently large to enable detection in experiments that are planned for the near future, and definitive identification in experiments proposed on a longer time scale. The (multi-channel) cross-section for annihilation is consistent with thermal production and freeze-out in the early universe, and with current evidence for dark matter annihilation in analyses of the observations of gamma rays by Fermi-LAT and antiprotons by AMS-02, as well as the constraints from Planck and Fermi-LAT. The cross-section for direct detection via collision with xenon nuclei is estimated to be slightly below 10−47 cm2, which should be attainable by LZ and Xenon nT and well within the reach of Darwin. The cross-section for collider detection via vector boson fusion is estimated to be ∼1 fb, and may be ultimately attainable by the high-luminosity LHC; definitive collider identification will probably require the more powerful facilities now being proposed.

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