Article
Physics, Multidisciplinary
Silvia Manconi, Alessandro Cuoco, Julien Lesgourgues
Summary: Scientists have used synchrotron polarization for the first time to constrain the annihilation of dark matter. They found that synchrotron polarization is generally more constraining than synchrotron intensity, independent of uncertainties in electron and positron propagation models or the Galactic magnetic field. The bounds obtained in this study compete with cosmic microwave background limits, particularly in the case of leptophilic dark matter.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Multidisciplinary
Ingolf Bischer, Tilman Plehn, Werner Rodejohann
Summary: Sterile neutrinos that couple only to third-generation fermions are appealing candidates for dark matter, capable of generating the observed relic density without violating constraints from direct and indirect detection. An Effective Field Theory approach reveals that these neutrinos represent a gauged third-generation B?L model, as well as third-generation scalar or vector leptoquarks, with LHC measurements able to distinguish between the underlying models.
Article
Astronomy & Astrophysics
M. Beneke, K. Urban, M. Vollmann
Summary: In this study, accurate energy spectra of high-energy photons from TeV scale dark-matter annihilation in the minimal wino and Higgsino benchmark models are provided. By merging electroweak Sudakov resummation and electroweak parton-shower, and considering the Sommerfeld effect, it is found that electroweak resummation significantly changes the shape of the photon-energy spectrum and the form of the line-signal.
Article
Astronomy & Astrophysics
Kaustubh Agashe, Steven J. Clark, Bhaskar Dutta, Yuhsin Tsai
Summary: This study explores the annihilation of dark matter in galaxies, highlighting the impact of different dark matter parameters on photon signals, particularly the differences between the Milky Way and dwarf galaxies.
Article
Astronomy & Astrophysics
A. Acharyya, A. Archer, P. Bangale, J. T. Bartkoske, P. Batista, M. Baumgart, W. Benbow, J. H. Buckley, A. Falcone, Q. Feng, J. P. Finley, G. M. Foote, L. Fortson, A. Furniss, G. Gallagher, W. F. Hanlon, O. Hervet, J. Hoang, J. Holder, T. B. Humensky, W. Jin, P. Kaaret, M. Kertzman, M. Kherlakian, D. Kieda, T. K. Kleiner, N. Korzoun, F. Krennrich, M. J. Lang, M. Lundy, G. Maier, C. E. McGrath, P. Moriarty, S. O'Brien, R. A. Ong, K. Pfrang, M. Pohl, E. Pueschel, J. Quinn, K. Ragan, P. T. Reynolds, E. Roache, N. L. Rodd, J. L. Ryan, I. Sadeh, L. Saha, M. Santander, G. H. Sembroski, R. Shang, M. Splettstoesser, D. Tak, J. V. Tucci, V. V. Vassiliev, D. A. Williams
Summary: Dark matter is a significant component in our understanding of the universe, and weakly interacting massive particles (WIMPs) are considered to be the leading candidates for dark matter. However, no evidence of WIMPs has been found in the conventional parameter space. In this study, we explore the possibility of ultraheavy dark matter (UHDM) as an alternative to WIMPs and search for indirect signals of dark matter annihilation in a higher mass range using the VERITAS gamma-ray observatory. Results from the observations of dwarf spheroidal galaxies suggest no gamma-ray signal from UHDM annihilation, leading to constraints on the annihilation cross section and allowed radius of UHDM particles.
ASTROPHYSICAL JOURNAL
(2023)
Article
Astronomy & Astrophysics
Hooman Davoudiasl, Peter B. Denton, David A. McGady
Summary: The conventional lore excludes fermionic dark matter with mass lighter than a few hundred electronvolts based on the Pauli exclusion principle. A new method is proposed in this paper which involves numerous quasi-degenerate species of fermions without couplings to the standard model to evade this bound. Gravitational interactions impose constraints from measurements at the LHC, cosmic rays, supernovae, and black hole spins and lifetimes, with a particular limit on the number of distinct species of particles being less than or around 10^62.
Article
Astronomy & Astrophysics
Daniel Boyanovsky, Mudit Rai, Lisong Chen
Summary: The study investigates the infrared dressing of bosonic or fermionic heavy particles by a cloud of massless particles as a possible mechanism for the production of ultralight dark matter or dark radiation in a radiation-dominated cosmology. The time evolution of an initial single heavy-particle state is analyzed using adiabatic expansion and a nonperturbative dynamical resummation method, showing similarities to particle decay with power-law decay. The asymptotic state is an entangled state of heavy and massless particles, and the energy momentum tensor is described by two independent fluids obeying covariant conservation laws.
Article
Astronomy & Astrophysics
Yu Cheng, Shao-Feng Ge, Xiao-Gang He, Jie Sheng
Summary: The possibility of reactivating the forbidden annihilation channel of dark matter around supermassive black holes has been discovered, providing a unique signal that can serve as evidence for its existence. Fermi-LAT data around Sgr ★ provides preliminary support for this theory.
Article
Astronomy & Astrophysics
Katherine Freese, Martin Wolfgang Winkler
Summary: The hot big bang is believed to be the origin of all matter and radiation in the Universe. Primordial nucleosynthesis provides strong evidence for the existence of a hot plasma in the early Universe. This paper describes a scenario in which dark matter can be formed around or even after primordial nucleosynthesis in a second big bang, called the dark big bang. The dark big bang occurs through a phase transition in the dark sector.
Article
Astronomy & Astrophysics
Aritra Biswas, Lopamudra Mukherjee, Soumitra Nandi, Sunando Kumar Patra
Summary: We impose constraints on the parameters of a new physics model with a potential dark matter (DM) signature through a global Cabibbo-Kobayashi-Maskawa (CKM) fit analysis. The model involves neutral quark current interactions mediated by a scalar that affect semileptonic and purely leptonic meson decays at one loop. We update the fit results for the Wolfenstein parameters and CKM elements by incorporating various updated inputs, including the contribution from the new model.
Article
Astronomy & Astrophysics
M. Beneke, S. Lederer, K. Urban
Summary: The dark matter annihilation cross section can be greatly increased if the annihilation occurs into a narrow resonance or if the dark-matter particles experience a long-range force before annihilation (Sommerfeld effect). We demonstrate that when both enhancements are present, they completely factorize, meaning that all long-distance non-factorizable effects cancel at the leading order. We then investigate the feasibility of super-resonant annihilation in Standard Model Higgs portal and simplified MSSM-inspired dark-matter scenarios.
Article
Physics, Multidisciplinary
Eric David Kramer, Eric Kuflik, Noam Levi, Nadav Joseph Outmezguine, Joshua T. Ruderman
Summary: This study proposes a new mechanism for dark matter formation which allows for dark matter masses exceeding the unitarity bound by many orders of magnitude. This mechanism is demonstrated in a specific dark matter model, enabling dark matter masses up to 10^9 GeV.
PHYSICAL REVIEW LETTERS
(2021)
Article
Astronomy & Astrophysics
Csaba Csaki, Sungwoo Hong, Gowri Kurup, Seung J. Lee, Maxim Perelstein, Wei Xue
Summary: The study focuses on dark matter models based on a gapped continuum, describing a mixture of states with continuous mass distribution using effective field theory. A specific weakly interacting continuum (WIC) model is considered, which successfully reproduces observed relic density and exhibits intriguing observational consequences such as continuous and cascade decays of dark matter states.
Article
Astronomy & Astrophysics
Alvaro de la Cruz Dombriz, Francisco Jose Maldonado Torralba, David F. Mota
Summary: The stable pseudo-scalar degree of freedom in the quadratic Poincare Gauge theory of gravity is identified as a suitable candidate for dark matter. The study determines the parameter space in the theory that can explain all predicted cold dark matter phenomena and constrains these parameters with astrophysical observations.
Article
Astronomy & Astrophysics
Youjia Wu, Sebastian Baum, Katherine Freese, Luca Visinelli, Hai -Bo Yu
Summary: Dark matter annihilation could potentially power the formation of the first luminous stars in the Universe, known as dark stars. In this study, we investigate the formation of dark stars in the self-interacting dark matter (SIDM) scenario. We propose a concrete particle physics model for SIDM that can explain various astrophysical observations and address small-scale problems of collisionless dark matter. Our findings suggest that dark stars powered by SIDM can have similar properties to those predicted in collisionless dark matter models.
