Article
Physics, Multidisciplinary
Kevin J. Kelly, Manibrata Sen, Yue Zhang
Summary: The self-interacting neutrino hypothesis provides motivation for addressing the tension between the origin of sterile neutrino dark matter and indirect detection constraints, and can produce a variety of testable signals from laboratories to the cosmos. In certain models, there must be a lower bound on the amount of extra radiation in the early Universe, which will be further strengthened with an improved x-ray search at the Athena observatory. This intimate relationship will be unambiguously tested by the upcoming CMB Stage 4 project.
PHYSICAL REVIEW LETTERS
(2021)
Article
Astronomy & Astrophysics
YeolLin Choejo, Yechan Kim, Hye-Sung Lee
Summary: The properties of a neutrino can vary significantly depending on whether it is Dirac or Majorana type, which is determined by the relative size of Dirac and Majorana masses. These masses can change if they come from oscillating scalar dark matter. The study shows that the change can be significant enough to convert the neutrino type periodically between Dirac and Majorana, while still satisfying constraints on the dark matter. This oscillation predicts periodic modulations in event rates in various neutrino phenomena.
Article
Physics, Multidisciplinary
S. J. Haselschwardt, B. G. Lenardo, T. Daniels, S. W. Finch, F. Q. L. Friesen, C. R. Howell, C. R. Malone, E. Mancil, W. Tornow
Summary: We present measurements showing the existence of low-lying isomeric states in 136Cs using y rays generated from 136Xe(p; n)136Cs reactions. Two states with lifetimes of around O(100) ns are identified in the decay sequence of 136Cs levels, which are populated through charged-current interactions of solar neutrinos and fermionic dark matter with 136Xe. This discovery enables xenon-based experiments to effectively suppress backgrounds and conduct spectroscopic studies of solar neutrinos and dark matter.
PHYSICAL REVIEW LETTERS
(2023)
Article
Physics, Particles & Fields
Francesco Nozzoli, Francesco Follega
Summary: In this work, unstable nuclei with respect to double beta decay are studied for a new approach to dark matter direct detection. The diagram responsible for neutrinoless double beta decay is considered as a possible detection technique for inelastically scattering a Majorana dark matter fermion on a double beta unstable nucleus, stimulating its decay. The exothermic nature of stimulated double beta decay enables the direct detection of light dark matter fermions, which are difficult to investigate using traditional elastic scattering techniques. The expected signal distribution for different dark matter masses and the upper limits on nucleus scattering cross sections, along with existing data for the (136)Chi e nucleus, are shown and compared.
EUROPEAN PHYSICAL JOURNAL C
(2023)
Article
Astronomy & Astrophysics
Seungwon Baek, P. Ko, Wan-Il Park
Summary: In the Higgs portal vector dark matter model, the behavior difference of the invisible Higgs decay width in the massless VDM limit demonstrates a limitation of effective field theory and the importance of gauge-invariant and renormalizable models.
Article
Astronomy & Astrophysics
Raymond T. Co, Benjamin Sheff, James D. Wells
Summary: Split Higgsinos, a class of models to explain dark matter, may soon be detected by multiple current experimental avenues. These models suggest a large split in scales between the electroweak scale and decoupled scalars, with relatively light Higgsinos between the two. They require few parameters, but can still explain gauge coupling unification, dark matter, and the hierarchy between the Planck and electroweak scales. We analyze the prospects of detecting split Higgsinos in current and future experiments, including the promising discovery potentials in electron electric dipole moment experiments.
Article
Physics, Particles & Fields
Lavina Sarma, Bichitra Bijay Boruah, Mrinal Kumar Das
Summary: In this study, we investigated the phenomenology of dark matter, neutrinoless double beta decay, and low scale leptogenesis. We proposed an extension of the Standard Model with three neutral fermions, a scalar doublet, and a dark sector consisting of a singlet scalar and a Dirac singlet fermion, to explain the mass patterns of neutrinos and accommodate dark matter mass. We also analyzed the dependence of various phenomena on decay parameters for different choices of arbitrary complex angles.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Article
Astronomy & Astrophysics
Guo-yuan Huang, Newton Nath
Summary: This study explores the neutrinoless double beta decay induced by an ultralight dark matter field coupled to neutrinos. The coupling violates lepton number and directly drives the AL=2 transition without suppressing small neutrino masses. However, this coupling is likely to alter the standard cosmological results in the early Universe, and the parameter space is severely constrained, making it difficult for future experiments to detect any signal even with a meV sensitivity to the effective neutrino mass.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
Arghyajit Datta, Rishav Roshan, Arunansu Sil
Summary: We investigate a simple variant of type-II seesaw in which the particle spectrum is extended with one singlet right-handed neutrino and an inert Higgs doublet, both odd under an additional Z(2) symmetry. The correlation between the smallness of the mass splitting and the largeness of the mass of the scalar triplet provides insights into the neutrino mass generation and the correct baryon abundance of the Universe.
Article
Astronomy & Astrophysics
Xin Deng, Xuewen Liu, Jing Yang, Ruiyu Zhou, Ligong Bian
Summary: The study focuses on heavy dark matter produced around the temperature of the phase transition and the formation of domain walls. It is discovered that the gravitational waves generated by domain wall decay can be probed by pulsar timing arrays and the future square kilometer array.
Article
Astronomy & Astrophysics
Bartosz Fornal, Alec Hewitt, Yue Zhao
Summary: The study systematically analyzes models with GeV-scale dark matter coupled to baryons and leptons, focusing on baryonic dark matter models that are free from tree-level proton decay when the dark matter particle is sufficiently heavy. A detailed discussion is then presented on a leptonic dark matter model, covering baryon asymmetry generation via leptogenesis, symmetry restoration in the dark sector, and expected dark matter annihilation signals in indirect detection experiments.
Article
Physics, Particles & Fields
K. W. Kim, G. Adhikari, E. Barbosa de Souza, N. Carlin, J. J. Choi, S. Choi, M. Djamal, A. C. Ezeribe, L. E. Franca, C. Ha, I. S. Hahn, E. J. Jeon, J. H. Jo, W. G. Kang, M. Kauer, H. Kim, H. J. Kim, S. H. Kim, S. K. Kim, W. K. Kim, Y. D. Kim, Y. H. Kim, Y. J. Ko, E. K. Lee, H. Lee, H. S. Lee, H. Y. Lee, I. S. Lee, J. Lee, J. Y. Lee, M. H. Lee, S. H. Lee, S. M. Lee, D. S. Leonard, B. B. Manzato, R. H. Maruyama, R. J. Neal, S. L. Olsen, B. J. Park, H. K. Park, H. S. Park, K. S. Park, R. L. C. Pitta, H. Prihtiadi, S. J. Ra, C. Rott, K. A. Shin, A. Scarff, N. J. C. Spooner, W. G. Thompson, L. Yang, G. H. Yu
Summary: The identification of metastable isomeric states of Ac-228 within the Th-232 decay chain has potential implications for low-energy background modeling in dark matter search experiments.
EUROPEAN PHYSICAL JOURNAL C
(2021)
Article
Astronomy & Astrophysics
Debajit Bose, Tarak Nath Maity, Tirtha Sankar Ray
Summary: By measuring the solar gamma ray flux, we have set stronger limits on the scattering cross section between dark matter and electrons, with these limits ranging from GeV to PeV scale for dark matter masses, which are four to six orders of magnitude stronger than existing limits.
Article
Physics, Particles & Fields
Lavina Sarma, Pritam Das, Mrinal Kumar Das
Summary: This study investigates the minimal scotogenic model, connecting dark matter with baryon asymmetry of the Universe and neutrino oscillation data. By focusing on the TeV scale heavy neutral singlet fermion, baryogenesis is obtained, with a primary focus on the intermediate-mass region of dark matter. The study explores both thermal and non-thermal approaches to dark matter production, as well as new allowed regions for dark matter masses within the inert Higgs doublet desert.
Article
Astronomy & Astrophysics
Michael A. Fedderke, Anubhav Mathur
Summary: Gravitational-wave detectors can detect new forces acting on test masses through the fluctuations in their separation. A recent proposal based on monitoring the separation of certain asteroids in the inner Solar System would provide sensitivity to mu Hz frequencies and allow exploration of the parameter space for dark matter. However, noise issues associated with asteroid rotational motion need to be overcome for sensitivity to be extended to higher mass ranges.
Article
Astronomy & Astrophysics
Cornelia Arcaro, Michele Doro, Julian Sitarek, Dominik Baack
Summary: In this report, the performance of replacing PMTs with SiPMs in a 3rd generation IACT array (using MAGIC as an example) is investigated using generalized simulations. It is found that the use of SiPMs can improve sensitivity by a factor of three at the current trigger threshold energy, and the stronger sensitivity of SiPMs in the red part of the spectrum does not affect the performance of IACTs, which is a source of background.
ASTROPARTICLE PHYSICS
(2024)
Article
Astronomy & Astrophysics
L. R. Colaco, R. F. L. Holanda, Rafael C. Nunes, J. E. Gonzalez
Summary: Motivated by future gravitational wave observations, this study performs forecast analysis to constrain a possible time variation of the fine structure constant a. By considering mock data from standard sirens and current observations of strong gravitational lensing systems, it is found that future standard sirens observations can also play a significant role in the search for variations of a.
ASTROPARTICLE PHYSICS
(2024)
Article
Astronomy & Astrophysics
Igor Andreoni, Michael W. Coughlin, Alexander W. Criswell, Mattia Bulla, Andrew Toivonen, Leo P. Singer, Antonella Palmese, E. Burns, Suvi Gezari, Mansi M. Kasliwal, R. Weizmann Kiendrebeogo, Ashish Mahabal, Takashi J. Moriya, Armin Rest, Dan Scolnic, Robert A. Simcoe, Jamie Soon, Robert Stein, Tony Travouillon
Summary: Binary neutron star mergers and neutron star-black hole mergers can be detected through gravitational waves and electromagnetic radiation. Discovering kilonovae will provide valuable insights into element nucleosynthesis and nuclear matter. The unique features of the Nancy Grace Roman Space Telescope allow for the detection of gravitational wave counterparts missed by optical telescopes.
ASTROPARTICLE PHYSICS
(2024)
Review
Astronomy & Astrophysics
Federico Cattorini, Bruno Giacomazzo
Summary: This article presents recent numerical advances in the theoretical characterization of massive binary black hole (MBBH) mergers in astrophysical environments. These systems are significant sources of gravitational waves (GWs) and promising candidates for multimessenger astronomy. Coincident detection of GWs and electromagnetic (EM) signals from merging MBBHs is a leading area of study in contemporary astrophysics. The scarcity of strong predictions for EM signals before, during, and after merger poses a major challenge in observational efforts. To address this, significant theoretical work has focused on characterizing EM counterparts that accompany GW signals. Full general relativistic modeling using Einstein's field equations coupled with magnetohydrodynamics equations has been key in producing accurate EM predictions. This review explores numerical investigations into the astrophysical manifestations of MBBH mergers and their potentially observable EM signatures.
ASTROPARTICLE PHYSICS
(2024)
Article
Astronomy & Astrophysics
Michael Maziashvili, Vakhtang Tsintsabadze
Summary: Coupled models of quintessence are introduced to avoid or mitigate the parameter fine-tuning problem and also should avoid the fine-tuning problem related to the initial conditions. Coupled models can explain the timescale of the coincidence between dark energy and matter energy densities, as well as the transition of dark energy dominance. Studying the mass varying neutrino model of dark energy with inverse power-law potential helps to understand its naturalness.
ASTROPARTICLE PHYSICS
(2024)