Torsten Bringmann
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View article: Prospects for dark matter observations in dwarf spheroidal galaxies with the Cherenkov Telescope Array Observatory
Prospects for dark matter observations in dwarf spheroidal galaxies with the Cherenkov Telescope Array Observatory Open
The dwarf spheroidal galaxies (dSphs) orbiting the Milky Way are widely regarded as systems supported by velocity dispersion against self-gravity, and as prime targets for the search for indirect dark matter (DM) signatures in the GeV-to-T…
View article: Sub-GeV dark matter and nano-Hertz gravitational waves from a classically conformal dark sector
Sub-GeV dark matter and nano-Hertz gravitational waves from a classically conformal dark sector Open
Strong first-order phase transitions in a dark sector offer a compelling explanation for the stochastic gravitational wave background in the nano-Hertz range recently detected by pulsar timing arrays (PTAs). We explore the possibility that…
View article: Updated constraints on the primordial power spectrum at sub-Mpc scales
Updated constraints on the primordial power spectrum at sub-Mpc scales Open
The primordial power spectrum of matter density perturbations contains highly valuable information about new fundamental physics, in particular cosmological inflation, but is only very weakly constrained observationally for small cosmologi…
View article: Resonant or asymmetric: the status of sub-GeV dark matter
Resonant or asymmetric: the status of sub-GeV dark matter Open
Sub-GeV dark matter (DM) particles produced via thermal freeze-out evade many of the strong constraints on heavier DM candidates but at the same time face a multitude of new constraints from laboratory experiments, astrophysical observatio…
View article: A Primer on Dark Matter
A Primer on Dark Matter Open
Dark matter is a fundamental constituent of the universe, which is needed to explain a wide variety of astrophysical and cosmological observations. Although the existence of dark matter was first postulated nearly a century ago and its abu…
View article: Dark matter line searches with the Cherenkov Telescope Array
Dark matter line searches with the Cherenkov Telescope Array Open
Monochromatic gamma-ray signals constitute a potential smoking gun signature for annihilating or decaying dark matter particles that could relatively easily be distinguished from astrophysical or instrumental backgrounds. We provide an upd…
View article: Supplementary data for "Resonant or asymmetric: The status of sub-GeV dark matter"
Supplementary data for "Resonant or asymmetric: The status of sub-GeV dark matter" Open
The files in this record contain supplementary data for the study, "Resonant or asymmetric:The status of sub-GeV dark matter". Samples have been created using GAMBIT and figures can be reproduced with pippi.
View article: Hunting WIMPs with LISA: correlating dark matter and gravitational wave signals
Hunting WIMPs with LISA: correlating dark matter and gravitational wave signals Open
The thermal freeze-out mechanism in its classical form is tightly connected to physics beyond the Standard Model around the electroweak scale, which has been the target of enormous experimental efforts. In this work we study a dark matter …
View article: Does NANOGrav observe a dark sector phase transition?
Does NANOGrav observe a dark sector phase transition? Open
Gravitational waves from a first-order cosmological phase transition, at temperatures at the MeV-scale, would arguably be the most exciting explanation of the common red spectrum reported by the NANOGrav collaboration, not the least becaus…
View article: High-frequency gravitational wave detection via optical frequency modulation
High-frequency gravitational wave detection via optical frequency modulation Open
High frequency gravitational waves can be detected by observing the frequency modulation they impart on photons. We discuss fundamental limitations to this method related to the fact that it is impossible to construct a perfectly rigid det…
View article: Does NANOGrav observe a dark sector phase transition?
Does NANOGrav observe a dark sector phase transition? Open
Gravitational waves from a first-order cosmological phase transition, at temperatures at the MeV-scale, would arguably be the most exciting explanation of the common red spectrum reported by the NANOGrav collaboration, not the least becaus…
View article: Minimal sterile neutrino dark matter
Minimal sterile neutrino dark matter Open
We propose a novel mechanism to generate sterile neutrinos νs in the early Universe, by converting ordinary neutrinos να in scattering processes νsνα→νsνs. After initial production by oscillations, this leads to an exponential growth in th…
View article: High-frequency gravitational wave detection via optical frequency modulation
High-frequency gravitational wave detection via optical frequency modulation Open
High frequency gravitational waves can be detected by observing the frequency modulation they impart on photons. We discuss fundamental limitations to this method related to the fact that it is impossible to construct a perfectly rigid det…
View article: Report of the Topical Group on Cosmic Probes of Dark Matter for Snowmass 2021
Report of the Topical Group on Cosmic Probes of Dark Matter for Snowmass 2021 Open
Cosmological and astrophysical observations currently provide the only robust, positive evidence for dark matter. Cosmic probes of dark matter, which seek to determine the fundamental properties of dark matter through observations of the c…
View article: No room to hide: implications of cosmic-ray upscattering for GeV-scale dark matter
No room to hide: implications of cosmic-ray upscattering for GeV-scale dark matter Open
The irreducible upscattering of cold dark matter by cosmic rays opens up the intriguing possibility of detecting even light dark matter in conventional direct detection experiments or underground neutrino detectors. The mechanism also sign…
View article: DarkSUSY 6.3 – Freeze-in, out-of-equilibrium freeze-out, cosmic-ray upscattering and further new features
DarkSUSY 6.3 – Freeze-in, out-of-equilibrium freeze-out, cosmic-ray upscattering and further new features Open
DarkSUSY is a versatile tool for precision calculations of a large variety of dark matter-related signals, ranging from predictions for the dark matter relic density to dark matter self-interactions and rates relevant for direct and indire…
View article: A new life for sterile neutrino dark matter after the pandemic
A new life for sterile neutrino dark matter after the pandemic Open
We propose a novel mechanism to generate sterile neutrinos $ν_s$ in the early Universe, by converting ordinary neutrinos $ν_α$ in scattering processes $ν_sν_α\toν_sν_s$. After initial production by oscillations, this leads to an exponentia…
View article: Simple and statistically sound recommendations for analysing physical theories
Simple and statistically sound recommendations for analysing physical theories Open
Physical theories that depend on many parameters or are tested against data from many different experiments pose unique challenges to statistical inference. Many models in particle physics, astrophysics and cosmology fall into one or both …
View article: DarkSUSY 6.3: Freeze-in, out-of-equilibrium freeze-out, cosmic-ray upscattering and further new features
DarkSUSY 6.3: Freeze-in, out-of-equilibrium freeze-out, cosmic-ray upscattering and further new features Open
DarkSUSY is a versatile tool for precision calculations of a large variety of dark matter-related signals, ranging from predictions for the dark matter relic density to dark matter self-interactions and rates relevant for direct and indire…
View article: Freezing-in a hot bath: resonances, medium effects and phase transitions
Freezing-in a hot bath: resonances, medium effects and phase transitions Open
Relic density calculations of dark matter freezing out from the primordial plasma have reached a high level of sophistication, with several numerical tools readily available that match the observationally required accuracy. Dark matter pro…
View article: Probing Dark Matter and Fundamental Physics with the Cherenkov Telescope Array
Probing Dark Matter and Fundamental Physics with the Cherenkov Telescope Array Open
Astrophysical observations provide strong evidence that more than 80% of all matter in the Universe is in the form of dark matter (DM). Two leading candidates of particles beyond the Standard Model that could constitute all or a fraction o…
View article: Strengthening the bound on the mass of the lightest neutrino with terrestrial and cosmological experiments
Strengthening the bound on the mass of the lightest neutrino with terrestrial and cosmological experiments Open
Supplementary Data Strengthening the bound on the mass of the lightest neutrino with terrestrial and cosmological experiments (arXiv:2009.03287) The files in this record contain data from the scans of the models considered in the GAMBIT pa…
View article: Thermal WIMPs and the Scale of New Physics: Global Fits of Dirac Dark Matter Effective Field Theories
Thermal WIMPs and the Scale of New Physics: Global Fits of Dirac Dark Matter Effective Field Theories Open
We assess the status of a wide class of WIMP dark matter (DM) models in light of the latest experimental results using the global fitting framework $\textsf{GAMBIT}$. We perform a global analysis of effective field theory (EFT) operators d…
View article: Supplementary Data: Thermal WIMPs and the Scale of New Physics: Global Fits of Dirac Dark Matter Effective Field Theories
Supplementary Data: Thermal WIMPs and the Scale of New Physics: Global Fits of Dirac Dark Matter Effective Field Theories Open
Supplementary Data Thermal WIMPs and the Scale of New Physics: Global Fits of Dirac Dark Matter Effective Field Theories. The files in this record contain supplementary data including the samples and plotting scripts used for the results i…
View article: Supplementary Data: Thermal WIMPs and the Scale of New Physics: Global Fits of Dirac Dark Matter Effective Field Theories
Supplementary Data: Thermal WIMPs and the Scale of New Physics: Global Fits of Dirac Dark Matter Effective Field Theories Open
Supplementary Data Thermal WIMPs and the Scale of New Physics: Global Fits of Dirac Dark Matter Effective Field Theories. The files in this record contain supplementary data including the samples and plotting scripts used for the results i…
View article: Precise dark matter relic abundance in decoupled sectors
Precise dark matter relic abundance in decoupled sectors Open
Dark matter (DM) as a thermal relic of the primordial plasma is increasingly pressured by direct and indirect searches, while the same production mechanism in a decoupled sector is much less constrained. We extend the standard treatment of…
View article: Sensitivity of the Cherenkov Telescope Array to a dark matter signal from the Galactic centre
Sensitivity of the Cherenkov Telescope Array to a dark matter signal from the Galactic centre Open
We provide an updated assessment of the power of the Cherenkov Telescope Array (CTA) to search for thermally produced dark matter at the TeV scale, via the associated gamma-ray signal from pair-annihilating dark matter particles in the reg…