Article
Physics, Particles & Fields
Amalia Betancur, Guillermo Palacio, Andres Rivera
Summary: This work investigates multicomponent dark sectors with a fermionic and a scalar dark matter candidate, focusing on the Inert Doublet Model for the scalar sector and three different models for the fermionic sector. The study examines the impact of dark matter conversion on relic abundance and considers current constraints from direct and indirect detection experiments, along with collider searches for fermionic dark matter candidates.
Review
Astronomy & Astrophysics
G. Belanger, A. Mjallal, A. Pukhov
Summary: The article presents a multi-component dark matter model with a scalar doublet and complex scalar singlet, using a discrete Z4 symmetry to relax direct detection constraints. Two parameter space scans were conducted, revealing the singlet as the dominant dark matter component in most cases, with the doublet being more likely in compressed scenarios.
Article
Physics, Particles & Fields
Shehu AbdusSalam, Leila Kalhor, Mohammad Mohammadidoust
Summary: We conducted global fits of the inert Higgs doublet model (IDM) considering collider and dark matter search limits, as well as the requirement for a strongly first-order electroweak phase transition (EWPT). The results show that there are still IDM parameter spaces that satisfy the considered observational constraints. Particularly, the data and theoretical requirements favor the existence of a scalar dark matter candidate with a mass around 100 GeV, mainly driven by the EWPT constraint. The mass splittings between the IDM scalars have a strong influence, sometimes in opposing directions, on the impact of electroweak precision measurements, dark matter direct detection limits, and the condition for a strong enough first-order EWPT.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Article
Astronomy & Astrophysics
Mohammed Omer Khojali, Ammar Abdalgabar, Amine Ahriche, Alan S. Cornell
Summary: This work considers an extended Standard Model to address the origin of dark matter. By applying various constraints, it is found that there is a sizable parameter space for these models, which can be explored in future collider and astrophysical searches.
Article
Physics, Multidisciplinary
Yi-Zhong Fan, Tian-Peng Tang, Yue-Lin Sming Tsai, Lei Wu
Summary: The recent measurement of the W-boson mass at Fermilab suggests the presence of new multiplets beyond the standard model. The introduction of an additional scalar doublet can naturally handle the new W-boson mass and the lightest scalar in the doublet can play the role of dark matter.
PHYSICAL REVIEW LETTERS
(2022)
Article
Astronomy & Astrophysics
G. Belanger, A. Mjallal, A. Pukhov
Summary: This study considers a model of multicomponent dark matter, where one component is feebly interacting and the other component is weakly interacting. By computing the relic density of multicomponent dark matter including both WIMPs and FIMPs, the study determines the parameter space that satisfies various constraints and discusses the possibility of probing the model through collider and astrophysical searches.
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
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
Manoranjan Dutta, Nimmala Narendra, Narendra Sahu, Sujay Shil
Summary: Researchers assume neutrinos to be either Dirac or Majorana and introduce additional particles to explain the proportionality between dark matter and baryonic matter. They propose that the CP-violating decay of heavy scalar doublets generates B-L asymmetry, which is later converted to DM asymmetry. They also suggest self-interaction of DM through a light mediator as a way to detect DM in terrestrial laboratories.
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
Physics, Multidisciplinary
Usharani Nagarajan, Gregory Beaune, Andy Y. W. Lam, David Gonzalez-Rodriguez, Francoise M. Winnik, Francoise Brochard-Wyart
Summary: The study explores the interaction between cell aggregates and microparticles, revealing different spreading patterns and aggregate formations. The findings may have practical implications on cancer metastasis and treatment.
COMMUNICATIONS PHYSICS
(2021)
Article
Astronomy & Astrophysics
Pei-Hong Gu
Summary: The study suggests that a TeV-scale Higgs doublet with a small mixing to the standard model Higgs doublet can have sizable Yukawa couplings to several right-handed neutrinos and standard model lepton doublets, providing a testable Dirac neutrino mass generation mechanism. The study further considers a seesaw mechanism involving a U(1)(B-L) gauge symmetry, predicting the existence of two right-handed neutrinos and a stable Dirac fermionic dark matter to simultaneously explain the small mixing between the two Higgs doublets and the generation of cosmic baryon asymmetry.
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
Physics, Particles & Fields
Debasish Borah, Satyabrata Mahapatra, Narendra Sahu
Summary: In this study, low-scale seesaw scenarios within the U(1)X gauge extension of the standard model are proposed to explain the excess of electron recoil events observed by the XENON1T experiment. The model predicts stable and long-lived dark matter particles while maintaining consistency with other phenomenological bounds. The parameter space is explored for both fermion and scalar inelastic dark matter candidates, showing the potential to explain the XENON1T excess.
Article
Physics, Particles & Fields
Purusottam Ghosh, Sk Jeesun
Summary: In this work, we investigate a hybrid mechanism for dark matter (DM) production, in which both thermal and non-thermal contributions during different epochs are responsible for the relic abundance of DM. By introducing an additional dark scalar, this hybrid setup alters the parameter space for DM compared to the pure thermal scenario. By considering the non-thermal DM production from the decay of the long-lived dark scalar, we can compensate for the deficit in DM abundance caused by thermal contributions. Furthermore, the direct detection constraints can be evaded by utilizing a specific symmetry, resulting in a suitable candidate for DM.
EUROPEAN PHYSICAL JOURNAL C
(2023)
