Article
Physics, Nuclear
Y. Q. He, J. K. Ge, G. J. Fu, H. Jiang
Summary: This study focuses on the symmetry energy and the Wigner energy in the binding energy formula for atomic nuclei, using the double difference of experimental symmetry-Wigner energies to extract the I-2 symmetry energy and Wigner energy coefficients. The results suggest that the macroscopic isospin dependence of binding energies is well explained by the symmetry energy and the I(2) Wigner energy coefficients, with further consideration of the I-4 term not substantially improving the calculation result.
Article
Physics, Multidisciplinary
Luis F. Alday, Xinan Zhou
Summary: The AdS/CFT correspondence is a tool for analytically studying strongly coupled physics, where quantum systems can be understood as weakly coupled gravity theories in a holographic spacetime with extra dimensions and negative curvature. This article introduces a new method to solve the long-standing problem in AdS/CFT, providing closed-form formulas for four-point functions in certain theories. The use of symmetries plays a key role in simplifying holographic correlators and recovering full correlators from special configurations. Our results highlight simplicities and organizing principles underlying holographic correlators, with potential cross-fertilization of ideas with progress in scattering amplitude programs.
Article
Materials Science, Multidisciplinary
Ankush Girdhar, Vinod Ashokan, Rajesh O. Sharma, N. D. Drummond, K. N. Pathak
Summary: We use the variational quantum Monte Carlo (VMC) method to study the dependence of ground-state properties of quasi-one-dimensional paramagnetic electron fluids on wire-width (b) and electron-density (rs). The crossover of the dominant peak in the static structure factor from k = 2kF to k = 4kF is investigated, and it is found that the crossover occurs as the wire width decreases for a fixed electron density. The study suggests that the crossover is due to the interplay of both rs and b < rs. The wire-width correlation effect is reflected in the peak height of the charge and spin structure factors, and the wire-width dependence of the electron correlation energy and the Tomonaga-Luttinger parameter K rho is significant.
Article
Physics, Nuclear
Kh. Benam, V. Dehghani, S. A. Alavi
Summary: This study calculates the nuclear level density and level density parameter using different methods, and uses them to calculate thermodynamic quantities. Additionally, it compares the results of different calculation methods and experimental data to evaluate their accuracy.
EUROPEAN PHYSICAL JOURNAL A
(2023)
Article
Physics, Multidisciplinary
Matthew Dodelson, Alba Grassi, Cristoforo Iossa, Daniel Panea Lichtig, Alexander Zhiboedov
Summary: We present an exact formula for the thermal scalar two-point function in fourdimensional holographic conformal field theories. The result is obtained by analyzing the wave equation on the AdS-Schwarzschild background and computing the connection coefficients of the Heun equation. The formula can be expressed in terms of the Nekrasov-Shatashvili partition function of an SU(2) supersymmetric gauge theory and can be evaluated numerically by truncating the number of instantons in the partition function.
Article
Astronomy & Astrophysics
Rabindra N. Mohapatra, Nobuchika Okada
Summary: In this study, we investigate the implications of Affleck-Dine (AD) baryogenesis on various baryon and lepton number violating processes, with a focus on neutron-antineutron oscillation. The analysis shows that adequate baryogenesis without washout by violating operators imposes constraints on the observability of the process. Interestingly, a split scalar spectrum model is found to be most advantageous for achieving observable neutron-antineutron oscillation while remaining consistent with AD baryogenesis, suggesting a possible embedding of this scenario into a grand unified SO(10) model. Additionally, for low scales in the 100 TeV range, there is a narrow parameter range where observable neutron-antineutron oscillation is compatible with viable AD baryogenesis, which predicts processes with Delta B = 4 or higher, albeit with highly suppressed amplitudes.
Article
Astronomy & Astrophysics
Ivan Martinez-Soler, Hisakazu Minakata
Summary: A unitarity method is proposed for determining tau neutrino appearance probability in LBL accelerator experiments and atmospheric neutrino observations. Toy analysis using NOvA data demonstrates the feasibility of measuring these probabilities with less than 5% accuracy in certain energy ranges, emphasizing the SM-independent nature of the determination.
Article
Astronomy & Astrophysics
Aldo Deandrea, Fabio Dogliotti, Dimitrios Tsimpis
Summary: In this article, we investigate the compactification of a Yang-Mills theory on a three-dimensional nilmanifold and its associated mass hierarchy. By examining a specific example of an SU(3) model, we reveal the relevance of twisted geometries in model building and gauge-Higgs type models.
Article
Astronomy & Astrophysics
Ernest Ma
Summary: The radiative Dirac neutrino masses and their mixing are connected to dark matter through the non-Abelian discrete symmetry A(5) of the 4-dimensional pentatope, which is softly broken to A(4) of the 3-dimensional tetrahedron. This unified understanding of the neutrino family structure from dark matter is achieved through the interplay of gauge symmetry, renormalizable Lagrangian field theory, and softly broken discrete symmetries.
Article
Nuclear Science & Technology
Li Li, Fang-Yuan Wang, Ying-Xun Zhang
Summary: In this study, the isospin properties of intermediate mass fragments (IMFs) produced in Sn collisions were investigated using the ImQMD model coupled with the GEMINI model. Three observables were analyzed, and the calculations showed that the isospin properties of IMFs were sensitive to the stiffness of the symmetry energy, favoring a soft symmetry energy (gamma=0.5).
NUCLEAR SCIENCE AND TECHNIQUES
(2022)
Article
Physics, Nuclear
Yeunhwan Lim, Anirban Bhattacharya, Jeremy W. Holt, Debdeep Pati
Summary: The study investigates the nature of an unknown compact object in a binary merger event and determines the maximum neutron star mass based on constraints from various physics models. It is shown that modifications to high-density equations of state are necessary to reconcile theoretical models with current neutron star observations. Furthermore, the existence of very massive neutron stars has a significant impact on the radii of other neutron stars, prompting further research in the field.
Article
Physics, Nuclear
D. Kekejian, J. P. Draayer, V. I. Mokeev, C. D. Roberts
Summary: The symplectic effective field theory discussed in the article unveils the emergence of symplectic symmetry in atomic nuclei. By extending the harmonic-oscillator Lagrangian, the theory can calculate nuclear volume, energy spectra, and B(E2) values with good agreement to experimental results.
Article
Nuclear Science & Technology
Ze-Peng Gao, Yong-Jia Wang, Hong-Liang Lu, Qing-Feng Li, Cai-Wan Shen, Ling Liu
Summary: This study uses the Light Gradient Boosting Machine (LightGBM) algorithm to predict the masses of unknown nuclei and explore the nuclear landscape. The refined models show significantly improved accuracy compared to the original mass models, and the predictions are in good agreement with the latest experimental data. LightGBM can be a powerful tool for refining theoretical nuclear mass models and predicting the binding energy of unknown nuclei.
NUCLEAR SCIENCE AND TECHNIQUES
(2021)
Article
Optics
Chenhang Huang, Daniel Pitagora, Timothy Zaklama, Kalman Varga
Summary: In this study, an explicitly correlated Gaussian basis is used to calculate the energies and wave functions of one-dimensional few-electron systems in confinement potentials induced by external potentials or coupling to light in cavity. The appearance and properties of electron density peaks as a function of the relative strength of the confinement and Coulomb interaction are investigated. It is found that coupling electrons to light can lead to Wigner crystal-like structures in the presence of an additional extremely weak confining potential, and the connection of these systems to Wigner crystals is discussed.
Article
Physics, Multidisciplinary
M. Ouali, M. Ouhammou, Y. Mekaoui, S. Taj, B. Manaut
Summary: The study found that under the influence of a strong laser field, the cross section of the Z boson significantly decreases; results obtained using different methods are consistent; the dependence of the laser-assisted differential cross section on the Centre of Mass Energy for different scattering angles shows varying behaviors.
CHINESE JOURNAL OF PHYSICS
(2022)
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.
