Article
Physics, Particles & Fields
Yong Du, Jiang-Hao Yu
Summary: The study precisely calculates the number of relativistic species, N-eff, in the standard model and predicts it will be measured to the percent level by CMB-S4 in the future. Neutral-current non-standard interactions are found to impact neutrino decoupling in the early Universe, subsequently modifying N-eff. The results provide a comprehensive analysis of the dimension-7 parameterized operators in effective field theory framework and offer a stringent constraint on the dimension-6 vector-type neutrino-electron operator's scale.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Astronomy & Astrophysics
Vedran Brdar, Admir Greljo, Joachim Kopp, Toby Opferkuch
Summary: This study focuses on the physics of neutrino magnetic moments, particularly in scenarios where right-handed or sterile neutrinos are heavier than left-handed Standard Model neutrinos. Strong exclusion limits on the active-to-sterile neutrino transition magnetic moment are derived based on data from various sources and experiments. Complementary constraints from astrophysics and cosmology are also investigated, along with a thorough analysis of Big Bang nucleosynthesis.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
Mariana Carrillo Gonzalez, Qiuyue Liang, Jeremy Sakstein, Mark Trodden
Summary: The tension between measurements of the Hubble constant at different redshifts may indicate new physics at play in the early universe, potentially involving early dark energy and scalar field interactions with standard model neutrinos. A neutrino-assisted early dark energy model is proposed to explain the coincidence between different epochs, with detailed analysis and constraints needed for validation. This scenario opens up new avenues for testing using cosmological data sets.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Physics, Particles & Fields
David Dunsky, Lawrence J. Hall, Keisuke Harigaya
Summary: The study investigates SU(2)_L x SU(2)_R x U(1)_(B-L) theories that incorporate the Higgs Parity mechanism, solving the strong CP problem and predicting three right-handed neutrinos. It introduces cosmologies where right-handed neutrinos are produced via different mechanisms and explores the parameter space where the lightest right-handed neutrino is dark matter and contributes to baryon asymmetry via leptogenesis. A theory of flavor is constructed to explain the lightness and stability of right-handed neutrino dark matter, while maintaining sufficient baryon asymmetry. The allowed parameter space can be probed by future colliders, lattice computations, and measurements of the neutrino mass hierarchy.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Astronomy & Astrophysics
Mattia Atzori Corona, Riccardo Murgia, Matteo Cadeddu, Maria Archidiacono, Stefano Gariazzo, Carlo Giunti, Steen Hannestad
Summary: This study reassesses a cosmological model with an additional sterile neutrino species and investigates its viability using various cosmic microwave background data. The model is found to resolve the Hubble tension but is constrained by high-multipole polarization data. Interestingly, when using ACT data, there is a possibility of a non-zero sterile neutrino mass, consistent with anomalies observed in short-baseline neutrino oscillation experiments. However, the combined analysis with Planck still favors the ACDM model.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
Huai-Ke Guo, Kuver Sinha, Daniel Vagie, Graham White
Summary: This study carefully analyzes the stochastic gravitational wave production from cosmological phase transitions in an expanding universe, considering both radiation and matter dominated histories. The dynamics of the phase transition, including various factors like bubble lifetime distribution and mean bubble separation, are studied in detail. The study also provides insights into the gravitational wave spectrum and highlights the potential of distinguishing between different expansion histories based on features of the gravitational wave spectral form.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Physics, Particles & Fields
Roberto A. Lineros, Mathias Pierre
Summary: The model explores the connection between Dark Matter and neutrinos by introducing new electroweakly charged states and imposing a discrete symmetry, generating a stable Dark Matter candidate. Numerical analysis shows that the model can reproduce neutrino masses, correct dark matter density, and viable dark matter masses. Direct and indirect detection signatures are explored, showing promising detection prospects with CTA, Darwin, and KM3Net, highlighting the complementarity between these observables.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Rupert Coy, Thomas Hambye
Summary: The text discusses the stability of dark matter particles and the potential for decay induced by seesaw physics, showing that this could lead to neutrino lines of intensity comparable to current neutrino telescope sensitivity. Models involving gauge bosons of abelian or non-abelian gauge symmetries are used to illustrate this possibility.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Astronomy & Astrophysics
Tsung-Han Yeh, Jessie Shelton, Keith A. Olivet, Brian D. Fieldsa
Summary: This study presents new limits on the cosmic expansion rate and relativistic energy density using the latest observations from Big Bang Nucleosynthesis (BBN) and the cosmic microwave background (CMB). The findings provide important constraints on early dark energy models and reveal the potential for exploring changes in neutrino species and the baryon-to-photon ratio across different cosmic epochs.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
Ananya Tapadar, Sougata Ganguly, Sourov Roy
Summary: In this paper, the non-adiabatic evolution of dark sector is studied in the framework of a U(1)(L mu)-( L tau )circle times U(1)(x) extension of the standard model. The connection between the visible and dark sectors is established through a portal coupling. The temperature evolution and various non-equilibrium stages of the dark sector are analyzed. Constraints on the model parameters from laboratory and astrophysical searches are investigated. The parameter space for the non-adiabatic evolution of the dark sector is significantly constrained for certain values of mass and coupling, while other constraints depend on the mass ratio.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Physics, Particles & Fields
Maira Dutra, Vinicius Oliveira, C. A. de S. Pires, Farinaldo S. Queiroz
Summary: In this model, a mixed warm and hot keV neutrino dark matter is naturally produced by arranging active and sterile neutrinos in the same SU(3)(L) multiplet, with the lightest sterile neutrino serving as dark matter. The heavy sterile neutrinos also play a role in diluting the dark matter density and affecting the population through their out-of-equilibrium decay, which helps to address the issue of overproduction in keV neutrino dark matter. Potential implications for Big Bang Nucleosynthesis and the number of relativistic degrees of freedom are explored in this study.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Astronomy & Astrophysics
Sougata Ganguly, Sourov Roy, Ananya Tapadar
Summary: The lack of information before BBN allows for the presence of a new species 0 with a specific energy density redshift. This non-standard cosmological setup enables a larger coupling between the dark and visible sectors, even without thermal equilibrium. By considering the U(1)Lmu-LT 0 U(1)X gauge extension of the SM, different cosmological phases of the thermally decoupled dark sector are studied. It is shown that the dark matter relic density and muon (g - 2) anomaly can be reconciled within this scenario, satisfying various constraints.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2023)
Article
Physics, Particles & Fields
Thomas G. Rizzo
Summary: In this paper, the interaction between dark matter and the Standard Model is studied, leading to a possible phenomenon of dark magnetic dipole moments. Through the investigation of a simple toy model, it is found that the existence of dark matter can result in outcomes that are compatible with existing experimental constraints and exhibit different characteristics once the DP is discovered. In specific parameter space regions, the invisible decay of DP may be more preferred.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Astronomy & Astrophysics
Alberto Salvio
Summary: The article investigates the general effective field theory describing the interactions of a massless dark photon with all Standard Model particles. The thermal production rate, cosmological yield, and contribution to the effective number of neutrinos of the dark photon are calculated. These predictions meet current observational bounds and will be tested in future measurements.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2023)
Article
Physics, Particles & Fields
Michael J. Baker, Andrea Thamm
Summary: Observing an evaporating black hole could provide conclusive information about elementary particles in nature, potentially discovering or excluding particles beyond the standard model of particle physics. Various scenarios beyond the standard model are considered, and the best ways to investigate them in the event of an observation are identified. Representative benchmark parameters are defined, and the photon spectra are analyzed over time. The impact of these models on future experimental analysis strategies is also discussed.
JOURNAL OF HIGH ENERGY PHYSICS
(2023)
Article
Astronomy & Astrophysics
Avirup Ghosh, Alejandro Ibarra, Tanmoy Mondal, Biswarup Mukhopadhyaya
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2020)
Article
Astronomy & Astrophysics
Avirup Ghosh, Arpan Kar, Biswarup Mukhopadhyaya
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2020)
Article
Physics, Particles & Fields
Avirup Ghosh, Deep Ghosh, Satyanarayan Mukhopadhyay
JOURNAL OF HIGH ENERGY PHYSICS
(2020)
Article
Physics, Particles & Fields
Eung Jin Chun, Tanmoy Mondal
Summary: This study introduces a hypothetical light leptophilic boson to explain the muon g-2 anomaly and potentially connect to dark matter. By realizing the leptophilic nature of a singlet boson within the two-Higgs-doublet model of type-X, the parameter space viable for explaining the updated muon g-2 discrepancy is identified. It is then suggested that this hypothetical particle could be unambiguously confirmed or discovered through the Yukawa process at a lepton collider designed as a Higgs factory.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Astronomy & Astrophysics
Koushik Dutta, Avirup Ghosh, Arpan Kar, Biswarup Mukhopadhyaya
Summary: By fitting and comparing the XENON1T data, we found that a certain range of warm dark matter parameter space is allowed for one background model, while the dark matter parameter space under other background models is constrained more by astrophysical data.
PHYSICS OF THE DARK UNIVERSE
(2021)
Article
Physics, Particles & Fields
Avirup Ghosh, Deep Ghosh, Satyanarayan Mukhopadhyay
Summary: The paper discusses the qualitative possibilities of CP-conserving processes in generating cosmological particle-antiparticle asymmetries, comparing different scenarios involving CP-violating and CP-conserving reactions and their effects on particle-antiparticle systems. It explores the dual role of CP-conserving processes in controlling the asymmetry generation and modifying the particle-antiparticle yields, demonstrating that the relative sizes of CP-conserving and violating reaction rates can significantly impact the asymmetric yields.
EUROPEAN PHYSICAL JOURNAL C
(2021)
Article
Physics, Particles & Fields
Tanmoy Mondal, Hiroshi Okada
Summary: This study proposes a gauged U(1)(B-L) extended two Higgs doublet model to explain both neutrino mass and lepton anomalous magnetic moments (g - 2). Neutrino mass is generated via an inverse seesaw mechanism by introducing singlet fermions. Lepton anomalous magnetic moments can be induced at the one-loop level by introducing an iso-spin singlet singly-charged boson.
Article
Physics, Particles & Fields
Tanmoy Mondal, Prasenjit Sanyal
Summary: We explore the prospect of searching for a fermiophobic charged Higgs via the same sign trilepton signal at the LHC, and show that this signal can serve as an effective complementary search for exploring high tan beta regions.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Astronomy & Astrophysics
Koushik Dutta, Avirup Ghosh, Arpan Kar, Biswarup Mukhopadhyaya
Summary: This study investigates a decaying scalar dark matter (DM) with a mass range of 10 GeV - 10 TeV. The constraints on the total decay width are derived by varying the branching ratios of all possible two-body standard model final states and using astrophysical and cosmological observations. The study also explores the potential of the upcoming Square Kilometre Array radio telescope in detecting radio signals from DM decay.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Physics, Particles & Fields
Shinya Kanemura, Tanmoy Mondal, Kei Yagyu
Summary: We discuss scenarios with wrong-sign (WS) Yukawa couplings for the discovered Higgs boson in the Yukawa-aligned two Higgs doublet model. In the WS scenario, the Yukawa couplings for down-type quarks and/or charged leptons have an opposite sign compared to those of the Higgs boson in the standard model, which can be consistent with current flavor data and the Higgs signal strengths. The phenomenology of additional Higgs bosons in such a scenario can be significantly different from that with right-sign Yukawa couplings, mainly due to a larger Higgs boson mixing required in the wrong-sign case.
JOURNAL OF HIGH ENERGY PHYSICS
(2023)
Article
Astronomy & Astrophysics
Koushik Dutta, Avirup Ghosh, Arpan Kar, Biswarup Mukhopadhyaya
Summary: This study derives an upper limit on the total annihilation cross-section for weakly interacting massive particle (WIMP) dark matter (DM) through the annihilation of WIMPs into all possible Standard Model (SM) particle pairs, including neutrinos. The study considers data from CMB, gamma-ray, cosmic-ray, and neutrino observations and assumes significant coupling between thermal WIMPs and SM neutrinos. The upper limit on the total annihilation cross-section allows the entire WIMP mass range to be consistent with the observed relic density.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2023)
Article
Astronomy & Astrophysics
Avirup Ghosh, Sourav Gope, Satyanarayan Mukhopadhyay
Summary: This article discusses the self-interaction processes of internally thermalized dark matter in the early universe. The study finds that when dark matter is nonrelativistic, its self-interaction leads to slower cooling compared to standard nonrelativistic matter, and there are strong constraints from structure formation during the matter-dominated epoch. However, if the cannibal phase freezes out in the radiation-dominated epoch, the self-interaction of cannibal dark matter can be viable and consistent with cosmological constraints.
Article
Astronomy & Astrophysics
Avirup Ghosh, Satyanarayan Mukhopadhyay
Summary: Postinflationary reheating affects the momentum distribution of dark matter particles through scattering processes, making it significantly different from the one obtained at reheating. The coupling between the inflaton and standard model fields plays a crucial role in these scattering effects.
Article
Astronomy & Astrophysics
Avirup Ghosh, Deep Ghosh, Satyanarayan Mukhopadhyay
Summary: The cosmological properties of dark matter stabilized by a reflection symmetry were studied, showing an interesting interplay between dark matter self-scatterings and annihilations in generating its present density and possible particle-antiparticle asymmetry in the dark matter sector. The role of dark matter self-scatterings in determining its present density and composition is a novel phenomenon, and the presence of both self-scatterings and annihilations is necessary to obtain a non-zero asymmetry in the dark matter sector, which would otherwise vanish due to unitarity sum rules.
Article
Physics, Particles & Fields
Eung Jin Chun, Tanmoy Mondal
JOURNAL OF HIGH ENERGY PHYSICS
(2020)