Article
Astronomy & Astrophysics
Shintaro Eijima, Osamu Seto, Takashi Shimomura
Summary: This study reexamines sterile neutrino dark matter in the gauged U(1)B-L model, improving upon previous research by tracing and evaluating the evolution of number densities. The results demonstrate that the gauge coupling of U(1)B-L for freeze-in sterile neutrinos is smaller than previously reported, avoiding overproduction and remaining consistent with cosmological constraints.
Article
Astronomy & Astrophysics
Anirban Biswas, Debasish Borah, Nayan Das, Dibyendu Nanda
Summary: We propose a scenario for nonthermal generation of dark matter (DM) due to a light Dirac neutrino portal in the standard model (SM) and dark sector particles. The model is constrained by the abundance of DM through the freeze-in mechanism using Planck 2018 data. Constraints on the effective relativistic degrees of freedom Delta Neff and free-streaming length of freeze-in DM are also examined.
Article
Astronomy & Astrophysics
Gil Paz, Alexey A. Petrov, Michele Tammaro, Jure Zupan
Summary: This study suggests that a nonrelativistic approximately 2 GeV dark matter interacting with visible matter through higher-dimensional Rayleigh operators may explain the excess of electron recoil events observed by the XENON1T Collaboration. The study also indicates that one-loop induced spin-independent scattering in dark matter may soon lead to a confirmation signal or exclude regions of viable parameter space for the Rayleigh DM model.
Article
Physics, Particles & Fields
Gong Jun Choi, Tsutomu T. Yanagida, Norimi Yokozaki
Summary: The minimal B-L model, which extends the Standard Model with heavy right-handed neutrinos, a complex scalar, and the gauged U(1)(B-L) symmetry, is considered the most compelling minimal model that can explain the small masses of active neutrinos and the baryon asymmetry of the universe. Whether this model can naturally accommodate an interesting dark matter candidate is a related question that is being studied. The study explores the possibility of explaining the current dark matter population using the gauge boson of the U(1)(B-L) symmetry.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Yuta Hamada, Hikaru Kawai, Kiyoharu Kawana, Kin-ya Oda, Kei Yagyu
Summary: The proposed model, based on the multicritical point principle, explains the electroweak scale, neutrino masses, Dark Matter, and inflation successfully by introducing two singlet scalar fields and heavy Majorana right-handed neutrinos into the Standard Model. By assuming a Z(2) symmetry, one of the scalars becomes a Dark Matter candidate with properties similar to minimal Higgs-portal scalar Dark Matter. The model can naturally achieve a saddle point in the Higgs potential at high energy scales, allowing for successful inflation with specific parameter values.
EUROPEAN PHYSICAL JOURNAL C
(2021)
Article
Astronomy & Astrophysics
Diego Restrepo, Andres Rivera, Walter Tangarife
Summary: This article presents an example of a gauged baryon number model where new fermions help to solve phenomenological problems of the standard model. It discusses the generation of small neutrino masses, the explanation of dark matter, and the mechanism for successful electroweak baryogenesis.
Article
Astronomy & Astrophysics
Yuri Shtanov
Summary: A new cosmological scenario proposes a light scalaron as dark matter in f(R) gravity, with the scalaron evolving due to interaction with the Higgs field during the electroweak crossover. The oscillating scalaron can represent cold dark matter, with its current energy density depending on the scalaron mass, which needs to be around 4 x 10(-3) eV to explain the observed dark matter abundance. Larger mass values would be required in scenarios where the scalaron is excited before the electroweak crossover.
Article
Astronomy & Astrophysics
Nobuchika Okada, Digesh Raut, Qaisar Shafi, Anil Thapa
Summary: A pseudo-Goldstone boson dark matter particle is proposed in the context of SO(10) grand unified theory, escaping detection in direct experiments which otherwise would constrain parameter space. Analysis is done on two scenarios of symmetry breaking to the Standard Model, with different implications for allowed parameter space and compatibility with experimental constraints.
Article
Astronomy & Astrophysics
Satyabrata Mahapatra, Rabindra N. Mohapatra, Narendra Sahu
Summary: We present two models that have the familiar leptonic symmetry Le - Lμ - L as a gauge symmetry. Anomaly cancellation constrains the allowed theories, with one model requiring a fourth sequential chiral standard model fermion generation and another model requiring gauging of (Le - Lμ - L) - (B1 - B2 - B3). Unlike global Le - Lμ - Lmodels, the gauged version can lead to normal hierarchy for neutrinos. We construct realistic models and discuss the dark matter candidate in both cases.
Article
Physics, Particles & Fields
Jin-Lei Yang, Zhong-Jun Yang, Xiu-Yi Yang, Hai-Bin Zhang, Tai-Fu Feng
Summary: The B-L symmetric SUSY model introduces new particles that play an important role in dark matter research. This study analyzes the properties of these new particles and presents numerical results.
EUROPEAN PHYSICAL JOURNAL C
(2023)
Article
Astronomy & Astrophysics
Oleg Lebedev, Jong-Hyun Yoon
Summary: The study explores the possibility that a single field is responsible for both inflation and dark matter, focusing on the minimal set-up where inflation is driven by a scalar coupling to curvature. The analysis shows that in the non-thermal case, reheating is hindered by backreaction and rescattering, rendering this possibility unrealistic, while thermalized dark matter is a viable option constrained by the unitarity bound on the inflaton mass.
Article
Astronomy & Astrophysics
Arya Farahi, Daisuke Nagai, Dhayaa Anbajagane
Summary: In this work, the coupling between dark matter, hot gas, and stellar mass is studied using cosmological simulations. The researchers find that the strength of this coupling depends on the scale at which halo profiles are measured. They also observe a radius-dependent additive bias when halos are selected based on properties other than their mass, which has implications for cluster abundance and cross-correlation cosmology.
ASTROPHYSICAL JOURNAL
(2022)
Article
Astronomy & Astrophysics
Rabindra N. Mohapatra, Nobuchika Okada
Summary: We propose a conformal extension of the standard model with local B-L symmetry and two complex scalars breaking B-L, which can unify the descriptions of neutrino mass, origin of matter, and dark matter. The higher B-L breaking scale via Coleman-Weinberg mechanism induces electroweak symmetry breaking and plays a key role in the model. It is responsible for neutrino masses and origin of matter. The lower B-L breaking scalar contributes to the pseudo-Goldstone dark matter. The model predicts a heavier dark matter with a lifetime longer than 10(28) seconds and a relic density arising from the freeze-in mechanism. The direct detection cross section is highly suppressed due to the pseudo-Goldstone nature of the dark matter particle. The model also predicts the dark matter to decay to two high energy neutrinos observable at the IceCube.
Article
Astronomy & Astrophysics
Piyabut Burikham, Tiberiu Harko, Kulapant Pimsamarn, Shahab Shahidi
Summary: We investigate if the behavior of test particles outside galaxies, which is usually attributed to dark matter, can be explained by the dynamical evolution of particles in a Weyl type geometry. We construct a conformally invariant gravitational action in Weyl geometry and derive the field equations in the absence of matter. A specific static, spherically symmetric model is considered and the galactic rotation curves are analyzed. We show that Weyl geometric models can be a viable alternative to the dark matter paradigm.
Article
Multidisciplinary Sciences
Gary P. Centers, John W. Blanchard, Jan Conrad, Nataniel L. Figueroa, Antoine Garcon, Alexander V. Gramolin, Derek F. Jackson Kimball, Matthew Lawson, Bart Pelssers, Joseph A. Smiga, Alexander O. Sushkov, Arne Wickenbrock, Dmitry Budker, Andrei Derevianko
Summary: Studies have shown that constraints inferred from several previous null experiments searching for ultralight bosonic dark matter were overestimated by factors ranging from 3 to 10, due to not considering the characteristic coherence time of the dark matter field. Laboratory measurements need to take into account the stochastic nature of such a virialized ultralight field when interpreting data.
NATURE COMMUNICATIONS
(2021)
Article
Astronomy & Astrophysics
Hiroshi Okada, Yuta Orikasa, Yutaro Shoji
Summary: In this model, the masses of active neutrinos and a dark matter candidate are generated radiatively through U(1)(B-L) gauge symmetry breaking, with the dark matter mass generally smaller compared to Weak Interacting Massive Particles. By considering dark matter production through the freeze-in mechanism, the observed dark matter relic density can be consistently realized with current experimental constraints on neutrino masses and lepton flavor structure.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Physics, Particles & Fields
Takaaki Nomura, Hiroshi Okada, Yuta Orikasa
Summary: In this study, we introduce a quark-lepton model based on lepto-quarks and modular A(4) symmetry. The neutrino mass is induced at one-loop level mediated by down quarks and leptoquarks, requiring an explanation for lepton and quark masses and mixings with a single modulus tau. Predictions for lepton and quark sectors with unified modulus tau are found, along with constraints originating from leptoquarks.
EUROPEAN PHYSICAL JOURNAL C
(2021)
Article
Physics, Multidisciplinary
Shuichiro Funatsu, Hisaki Hatanaka, Yutaka Hosotani, Yuta Orikasa, Naoki Yamatsu
Summary: This paper investigates some phenomena in gauge-Higgs unification, where gauge symmetry is dynamically broken by an AB phase in the fifth dimension. The behavior of fermions is analyzed in different spacetime setups, and the transformation of chiral fermions to vector-like fermions in the RS space is demonstrated.
PROGRESS OF THEORETICAL AND EXPERIMENTAL PHYSICS
(2022)
Article
Physics, Nuclear
Hiroshi Okada, Yuta Orikasa
Summary: We study the double covering of modular flavor symmetry and construct lepton models for A(4) canonical and radiative seesaw scenarios. The results show that both scenarios produce predictions in reproducing neutrino oscillation data in case of normal hierarchy. However, no solution satisfies the neutrino oscillation data in case of radiative seesaw of inverted hierarchy.
Article
Astronomy & Astrophysics
Tatsuo Kobayashi, Hiroshi Okada, Yuta Orikasa
Summary: We propose a new mechanism of stabilization for dark matter under fixed points of modular A(4) symmetry, thanks to recovering a residual symmetry for each of fixed points. We find that a model successfully reproduces the neutrino oscillation data without conflict with the DM stability.
PHYSICS OF THE DARK UNIVERSE
(2022)
Article
Physics, Multidisciplinary
Yutaka Hosotani, Shuichiro Funatsu, Hisaki Hatanaka, Yuta Orikasa, Naoki Yamatsu
Summary: In the grand unified theory-inspired gauge-Higgs unification in the Randall-Sundrum warped spacetime, the W- and Z-couplings of 4D fermion modes become nontrivial, deviating slightly from those in the standard model. These couplings take the form of matrices in the Kaluza-Klein states and depend on the Aharonov-Bohm phase in the fifth dimension. Surprisingly, there are three sum rules among the coupling matrices, ensuring the finiteness of certain combinations of corrections. Numerical evaluation confirms the accuracy of these sum rules, and based on them, improved oblique parameters in gauge-Higgs unification are proposed. Oblique corrections due to fermion 1-loop diagrams are found to be small.
PROGRESS OF THEORETICAL AND EXPERIMENTAL PHYSICS
(2023)
Article
Astronomy & Astrophysics
Shuichiro Funatsu, Hisaki Hatanaka, Yuta Orikasa, Naoki Yamatsu
Summary: In this paper, we studied the contributions to single Higgs boson production processes via Z' and W' bosons in the GHU model. We analyzed the cross sections of three processes and found that the deviation from the SM increases with respect to the center-of-mass energy and can reach up to 20% for certain energy scales. We also showed that the sign of the bulk mass of a lepton multiplet in the GHU model can be determined by examining the deviation of the left-right symmetry.
Article
Astronomy & Astrophysics
Shuichiro Funatsu, Hisaki Hatanaka, Yutaka Hosotani, Yuta Orikasa, Naoki Yamatsu
Summary: In this study, we investigate the effects of Z' bosons in gauge-Higgs unification models on e(+)e(-) Bhabha scatterings. By evaluating the differential cross sections in Bhabha scatterings, including Z' bosons, in two types of SO(5)xU(1) x SU(3) GHU models, we observe deviations from the Standard Model. Furthermore, a new observable is proposed for future TeV-scale e(+)e(-) linear colliders.
Article
Astronomy & Astrophysics
Shuichiro Funatsu, Hisaki Hatanaka, Yutaka Hosotani, Yuta Orikasa, Naoki Yamatsu
Summary: In this study, the pp -> {W, W'} -> l nu and pp -> {gamma, Z, Z'} -> l(+)l(-) (l = e, mu) processes are investigated in the SU(3)(C) x SO(5) x U(1)(X) gauge-Higgs unification (GHU) models. Constraints on the KK mass scale and the Aharonov-Bohm phase are obtained from experimental data.
Article
Astronomy & Astrophysics
Shuichiro Funatsu, Hisaki Hatanaka, Yutaka Hosotani, Yuta Orikasa, Naoki Yamatsu
Summary: The study reveals that the electroweak phase transition in the SO(5) x U(1) x SU(3) gauge-Higgs unification is weakly first order and occurs at T = T-c(EW) around 163 GeV, similar to behavior in the standard model. Additionally, a new phase appears at higher temperatures.
Article
Astronomy & Astrophysics
Shuichiro Funatsu, Hisaki Hatanaka, Yutaka Hosotani, Yuta Orikasa, Naoki Yamatsu
Article
Astronomy & Astrophysics
Shuichiro Funatsu, Hisaki Hatanaka, Yutaka Hosotani, Yuta Orikasa, Naoki Yamatsu
Article
Astronomy & Astrophysics
Schuichiro Funatsu, Hisaki Hatanaka, Yutaka Hosotani, Yuta Orikasa, Naoki Yamatsu
Article
Astronomy & Astrophysics
Shuichiro Funatsu, Hisaki Hatanaka, Yutaka Hosotani, Yuta Orikasa, Naoki Yamatsu
Article
Astronomy & Astrophysics
Parada T. P. Hutauruk, Takaaki Nomura, Hiroshi Okada, Yuta Orikasa
