Article
Astronomy & Astrophysics
Ernest Ma
Summary: In the context of a left-right extension of the standard model, the addition of a gauged U(1)(D) dark symmetry allows the electron to obtain a radiative mass in one loop and two Dirac neutrinos to obtain masses in three loops.
Article
Astronomy & Astrophysics
Hooman Davoudiasl, Ian M. Lewis, Matthew Sullivan
Summary: We propose a model that explains Dirac neutrino masses through nonperturbative QCD dynamics and chiral symmetry breaking. This model can be tested experimentally at hadron colliders and relies on the role of light quarks. Constraints from D - (D) over bar mixing data restrict the parameter space of the model. Measurements of charged Higgs leptonic branching ratios can differentiate between different neutrino mass hierarchies.
Article
Astronomy & Astrophysics
Carlos Henrique de Lima, Daniel Stolarski
Summary: In this work, the mechanism of how the gravitational 0 anomaly generates neutrino masses is explored. It is found that the leading renormalizable interactions of the neutrino condensate cannot generate hierarchical masses consistent with observation, even when considering Standard Model loop corrections. It is shown that higher-dimensional operators can alleviate this problem. These operators can be generated from the gravitational anomaly itself, but there is no clear way to know without a deeper understanding of the low-energy description of this mechanism. Therefore, the possibility of new particles generating neutrino mass splittings is explored, and it is shown that both new particles altering the scalar potential of the condensate and new particles in loops for the neutrino self-energy can solve this problem.
Article
Physics, Particles & Fields
H. Bonet, A. Bonhomme, C. Buck, K. Fuelber, J. Hakenmueller, J. Hempfling, G. Heusser, T. Hugle, M. Lindner, W. Maneschg, T. Rink, H. Strecker, R. Wink
Summary: We present the first constraints on the electromagnetic properties of neutrinos using data collected from the CONUS germanium detectors. The analysis provides upper limits on the effective neutrino magnetic moment and millicharge. Results show that no neutrino signal in these channels has been observed at the Brokdorf Nuclear Power Plant in Germany.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Article
Physics, Multidisciplinary
Nicholas J. Benoit, Takuya Morozumi, Yusuke Shimizu, Kenta Takagi, Akihiro Yuu
Summary: The type-I seesaw model is a common extension to the Standard Model that describes neutrino masses. We studied the 3-2 and 3-3 models and found that in certain cases, the effective neutrino mass matrix is rank degenerate.
PROGRESS OF THEORETICAL AND EXPERIMENTAL PHYSICS
(2022)
Article
Astronomy & Astrophysics
Saeed Ansarifard, Yasaman Farzan
Summary: It is unclear whether the mass terms for neutrinos are of Majorana type or of Dirac type. The pseudo-Dirac scheme combines these two types with a dominant Dirac mass term and a subdominant Majorana one. The recent solar neutrino data, including the seasonal variation of the 7Be flux reported by BOREXINO, suggests a pseudo-Dirac solution with a nonzero splitting for v2 of Am22.
Article
Astronomy & Astrophysics
Patrick D. Bolton, Frank F. Deppisch, Kare Fridell, Julia Harz, Chandan Hati, Suchita Kulkarni
Summary: The search for a Primakoff upscattering process at coherent elastic neutrino-nucleus scattering (CE??NS) experiments can provide stringent constraints on the neutrino magnetic moment in the presence of transition magnetic moments between active and sterile neutrinos. Additionally, a radiative upscattering process with an emitted photon in the final state can induce a novel coincidence signal at CE??NS experiments, which can also probe neutrino transition magnetic moments beyond existing limits and potentially be sensitive to the nature of the sterile state mediating the process.
Article
Physics, Multidisciplinary
A. N. Ikot, P. O. Amadi, U. S. Okorie, R. Horchani, N. Okpara, L. Obagboye
Summary: In this paper, the quantum dynamics of the relativistic Klein-Gordon oscillator with Yukawa confining potential is studied. The approximate bound state energy spectrum and the corresponding wave function expressed in terms of biconfluent Hun function are obtained using the extended Nikiforov-Uvarov method. The effects of the screening parameter on the energy spectrum of the Klein-Gordon oscillator are discussed in detail.
Article
Physics, Particles & Fields
Gabriela Barenboim, Jessica Turner, Ye-Ling Zhou
Summary: The study demonstrates that non-zero neutrino masses can be generated from gravitational interactions. By solving the Schwinger-Dyson equations, the scale of neutrino condensate and the number of new particle degrees of freedom required for gravitationally induced dynamical chiral symmetry breaking are determined. It is shown that for minimal beyond the Standard Model particle content, the condensation scale occurs close to the Planck scale.
EUROPEAN PHYSICAL JOURNAL C
(2021)
Article
Astronomy & Astrophysics
Takehiko Asaka, Hisashi Okui
Summary: This study investigates the generation of tiny neutrino masses in the Standard Model through the seesaw mechanism, focusing on the case when one right-handed neutrino has suppressed Yukawa coupling constants. The long-lived right-handed neutrino can produce additional entropy by decay, impacting the gravitational wave background originated in the primordial inflation. Probing the mass and coupling constants of the long-lived right-handed neutrino can provide information on the mass of the lightest active neutrino.
Article
Physics, Multidisciplinary
Bipin Singh Koranga, Vivek Kumar Nautiyal
Summary: The study discusses the range of mixing parameters in a four-neutrino scenario and the implications for neutrino mass square difference and mixing. It determines the possible values of the effective majorana neutrino mass and provides upper bounds on the mass for different mass orderings in the four-neutrino scheme.
INTERNATIONAL JOURNAL OF THEORETICAL PHYSICS
(2021)
Article
Astronomy & Astrophysics
Thomas G. Rizzo
Summary: The kinetic mixing of a dark photon with the Standard Model requires the existence of portal matter, which carries both SM and dark sector quantum numbers. In this paper, we extend the dark gauge group GDark to a non-Abelian group to better understand the interplay between GSM and GDark. We also consider extending the SM gauge group to that of the left-right symmetric model and link the breaking of GDark and the mass scales of the PM fields to RH-neutrino and the heavy gauge bosons of the LRM.
Article
Physics, Particles & Fields
C. S. Kim, Janusz Rosiek, Dibyakrupa Sahoo
Summary: Using principles of Lorentz invariance, CP and CPT symmetry, and quantum statistics, a model-independent study is conducted on the effects of possible nonstandard couplings of neutrinos. The study focuses on the different statistical properties of Dirac and Majorana neutrinos, which can lead to observable effects not suppressed by the small ratios of neutrino and heavier particle masses. The formulation of the Dirac Majorana confusion theorem (DMCT) explains why it is difficult to observe the different behavior of both types of neutrinos in experiments with only standard model-like couplings.
EUROPEAN PHYSICAL JOURNAL C
(2023)
Article
Astronomy & Astrophysics
Ricardo Cepedello, Pablo Escribano, Avelino Vicente
Summary: The lepton sector of the Standard Model is facing several intriguing anomalies including deviations in b ? sll processes, violation of lepton flavor universality, and a discrepancy in the muon anomalous magnetic moment. It also fails to explain neutrino oscillation data, which imply nonzero neutrino masses and lepton mixings. A new model is proposed to accommodate these anomalies and induce neutrino masses, while providing a testable dark matter candidate. The model introduces a dark sector that contributes to the observables of interest at the 1-loop level, offering an economical explanation to open questions in particle physics while being consistent with experimental constraints.
Article
Astronomy & Astrophysics
Guo-yuan Huang, Manfred Lindner, Pablo Martinez-Mirave, Manibrata Sen
Summary: This study investigates a consistent scenario of time-varying neutrino masses and discusses their impact on cosmology, beta decay, and neutrino oscillation experiments. The study focuses on how the coupling between a sterile neutrino and an ultralight scalar field generates time-varying masses, affecting cosmological bounds and experimental results. Further constraints on this scenario can be derived from terrestrial experiments, such as beta-decay experiments, which may show nontrivial distortions to electron spectra. Additionally, the presence of time-varying masses of sterile neutrinos may alter the interpretation of light sterile neutrino parameter space, particularly in the context of reactor and gallium anomalies.
Article
Astronomy & Astrophysics
Nelson R. F. Braga, Octavio C. Junqueira
Summary: This study investigates the influence of rotation on the transition temperature of strongly interacting matter produced in non-central heavy ion collisions. By using a holographic description of an AdS black hole, the authors extend the analysis to the more realistic case where the matter spreads over a region around the rotational axis. The results show the coexistence of confined and deconfined phases and are consistent with the concept of local temperature in rotating frames developed by Tolman and Ehrenfest.
Article
Astronomy & Astrophysics
Bing Sun, Jiachen An, Zhoujian Cao
Summary: This paper investigates the effect of gravitational constant variation on the propagation of gravitational waves. By employing two analytical methods, the study finds that variations in the gravitational constant result in amplitude and phase corrections for gravitational waves, and the time variation of the gravitational constant can be constrained through the propagation of gravitational waves.
Article
Astronomy & Astrophysics
Abdellah Touati, Zaim Slimane
Summary: This letter presents the first study of Hawking radiation as a tunneling process within the framework of non-commutative gauge theory of gravity. The non-commutative Schwarzschild black hole is reconstructed using the Seiberg-Witten map and the star product. The emission spectrum of outgoing massless particles is computed using the quantum tunneling mechanism. The results reveal pure thermal radiation in the low-frequency scenario, but a deviation from pure thermal radiation in the high-frequency scenario due to energy conservation. It is also found that noncommutativity enhances the correlations between successively emitted particles.
Article
Astronomy & Astrophysics
Shahar Hod
Summary: The travel times of light signals between two antipodal points on a compact star's surface are calculated for two different trajectories. It is shown that, for highly dense stars, the longer trajectory along the surface may have a shorter travel time as measured by asymptotic observers. A critical value of the dimensionless density-area parameter is determined for constant density stars to distinguish cases where crossing through the star's center or following a semi-circular trajectory on the surface has a shorter travel time as measured by asymptotic observers.