Article
Astronomy & Astrophysics
Brandon M. Roach, Steven Rossland, Kenny C. Y. Ng, Kerstin Perez, John F. Beacom, Brian W. Grefenstette, Shunsaku Horiuchi, Roman Krivonos, Daniel R. Wik
Summary: We present two complementary NuSTAR x-ray searches for keV-scale dark matter decaying to monoenergetic photons in the Milky Way halo. Finding no evidence of anomalous x-ray lines using either method, we set limits on the active-sterile mixing angle and sterile-neutrino masses. The first key result is that we strongly disfavor a 7-keV sterile neutrino decaying into a 3.5-keV photon, and the second is that we derive leading limits on sterile neutrinos with masses 15-18 keV and 25-40 keV, reaching or extending below the big bang nucleosynthesis limit. In combination with previous results, the parameter space for the neutrino minimal standard model is now nearly closed.
Article
Astronomy & Astrophysics
Marina Cermeno, Celine Degrande, Luca Mantani
Summary: This work studies the indirect photon signatures of leptophilic dark matter from Centaurus A. The derived constraints on the average annihilation cross section are 7 orders of magnitude stronger than those from measurements of the Galactic Center. The study also explores the possibility of detecting these interactions by experimentally exploiting the high circular polarization asymmetry of the photons.
Article
Astronomy & Astrophysics
Emil Brinch Holm, Laura Herold, Steen Hannestad, Andreas Nygaard, Thomas Tram
Summary: A large number of studies using Bayesian parameter inference have found a strong preference for either very long-lived or very short-lived decaying dark matter. However, this paper demonstrates that this preference is due to volume effects, and using profile likelihoods, it is found that an intermediate regime with 3% decay of cold dark matter just before recombination is the best fit. The model shows an overall preference over the standard model, but only slightly alleviates the H0 tension.
Article
Astronomy & Astrophysics
Emil Brinch Holm, Thomas Tram, Steen Hannestad
Summary: Decaying dark matter models can impact the predicted value of the Hubble constant and bridge the discrepancies between CMB inferences and local measurements. In this study, a reevaluation of the warm dark matter decaying model is performed, including the mass of the decaying species, and its ability to alleviate tensions in Hubble and sigma(8) is assessed. The model shows mild improvements but further research is required to fully evaluate its effectiveness.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
Earl Lester, Krzysztof Bolejko
Summary: The study investigates the effects of decaying dark matter on cosmic voids, highlighting these voids as valuable locations for studying dark matter physics with less baryonic contamination. Future cosmological observations should focus on identifying signs of decaying dark matter to confirm or rule out this scenario. Lack of reported features could impose constraints on the decay rate of dark matter.
Article
Astronomy & Astrophysics
B. Skrzypek, M. Chianese, C. A. Arguelles
Summary: The IceCube Neutrino Observatory has measured astrophysical neutrinos using events in the TeV to PeV energy range. The origin of these neutrinos is still unknown, but it could potentially be caused by dark matter decay. Previous studies have suggested that an excess in the energy range of 40-200 TeV may be due to heavy dark matter decay, but there are uncertainties in the modeling of the neutrino flux and gamma-ray emission. In this work, constraints on decaying dark matter are derived using data from multiple sources, and it is found that the astrophysical neutrino flux could be largely contributed by dark matter, but ruling it out depends on assumptions about gamma-ray and neutrino backgrounds.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2023)
Article
Astronomy & Astrophysics
Alexander V. Gramolin, Arne Wickenbrock, Deniz Aybas, Hendrik Bekker, Dmitry Budker, Gary P. Centers, Nataniel L. Figueroa, Derek F. Jackson Kimball, Alexander O. Sushkov
Summary: This article investigates the spectral line shapes of axionlike dark matter and discusses their importance in optimizing experimental design and data analysis. The authors extend previous results on axion-photon and axion-gluon couplings to the case of gradient coupling and examine the directional sensitivity of the corresponding haloscope. They also analyze the daily and annual modulations of the gradient signal caused by Earth's motions, which could serve as important evidence for the detection of axionlike particles in our Galaxy's halo.
Article
Physics, Particles & Fields
Shuai Xu, Sibo Zheng
Summary: A decaying cold dark matter model is proposed to explain the excess of electron recoil observed at the XENON1T experiment. The model suggests that daughter dark matter from parent dark matter decay can saturate the peak of electron recoil energy. The proposed model is consistent with experimental limits from dark matter detections, Cosmic microwave background, and large scale structure experiments.
EUROPEAN PHYSICAL JOURNAL C
(2021)
Article
Physics, Multidisciplinary
Antonio Ambrosone, Marco Chianese, Damiano F. G. Fiorillo, Antonio Marinelli, Gennaro Miele
Summary: Starburst galaxies are potential sources of high-energy gamma rays, and their cosmic-ray spectrum distortion can be indirectly observed. Current data provide tight bounds on the cross section between protons and dark matter, while future measurements are expected to significantly improve these limits.
PHYSICAL REVIEW LETTERS
(2023)
Article
Astronomy & Astrophysics
Andreas Nygaard, Thomas Tram, Steen Hannestad
Summary: This study updates constraints on the simple decaying cold dark matter model with dark radiation, using the latest CMB data to infer new constraints in both short-lived and long-lived regimes. The model's impact on Hubble and sigma 8 tensions is investigated, showing that each decay regime can slightly alleviate a different tension, but not both simultaneously. The study also derives a mapping between short-lived DCDM and a correction to the effective number of massless neutrino species.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
Saikat Das, Kohta Murase, Toshihiro Fujii
Summary: In this study, constraints on decaying very heavy dark matter (VHDM) are revisited using the latest ultrahigh-energy cosmic-ray (UHECR) data and ultrahigh-energy (UHE) gamma-ray flux upper limits. Updated limits on the VHDM lifetime for masses up to 1015 GeV are presented, considering decay into quarks, leptons, and massive bosons. The analysis shows that the constraints from UHE gamma-ray upper limits are 10 times more stringent than those obtained from cosmic rays.
Article
Astronomy & Astrophysics
Gonzalo Herrera, Alejandro Ibarra
Summary: This study investigates the impact of non-galactic dark matter on direct detection experiments by calculating the effect of dark matter flux from the Local Group and the Virgo Supercluster on nuclear and electron recoil experiments. The results show that the increase in dark matter flux can significantly enhance the signal rate.
Article
Astronomy & Astrophysics
S. Fischer, D. Malyshev, L. Ducci, A. Santangelo
Summary: Based on the data collected by the INTEGRAL's SPI spectrometer over nearly 20 years, constraints on decaying dark matter particles have been presented. The analysis reveals the detection of 32 line-like features, with 29 of them coinciding with known instrumental and astrophysical lines. Additionally, limits on the mixing angle for sterile neutrino dark matter have been reported in relation to the neutrino's mass.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Review
Multidisciplinary Sciences
Malcolm Fairbairn
Summary: This article provides a brief overview of galactic astrophysics and astronomy aspects that may have implications for particle dark matter, highlighting the tendency of particle physicists to overlook already resolved anomalies in their attempts to address observed anomalies in galaxies.
Article
Astronomy & Astrophysics
Lea Fuss, Mathias Garny
Summary: Investigated the impact of the Decaying Cold Dark Matter (DCDM) model on the tension between cosmic microwave background (CMB) and large-scale structure measurements. Found that the Lyman-alpha forest data is compatible with the DCDM model and can provide improved constraints under certain parameter values.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2023)
