Article
Physics, Particles & Fields
Shubhalaxmi Rath, Binoy Krishna Patra
Summary: This study investigates the influence of strong magnetic fields on the viscous properties of hot QCD matter by calculating shear and bulk viscosities. It is found that both viscosities increase in the presence of a strong magnetic field, further enhanced by the addition of chemical potential. Additionally, the study observes changes in viscosity with temperature, where shear viscosity increases but bulk viscosity decreases, contrasting their behaviors in the absence of a magnetic field.
EUROPEAN PHYSICAL JOURNAL C
(2021)
Article
Multidisciplinary Sciences
Cuimei Cao, Shiwei Chen, Rui-Chun Xiao, Zengtai Zhu, Guoqiang Yu, Yangping Wang, Xuepeng Qiu, Liang Liu, Tieyang Zhao, Ding-Fu Shao, Yang Xu, Jingsheng Chen, Qingfeng Zhan
Summary: Cubic materials are not expected to exhibit anisotropy in transport phenomena, but we report an anomalous anisotropy of spin current in the (001) film of the noncollinear antiferromagnetic spin source Mn3Pt. This anisotropy originates from the intertwined time reversal-odd and time reversal-even spin Hall effects. By analyzing the symmetry and characterizing the current-induced spin torques in Mn3Pt-based heterostructures, we find that the spin current in Mn3Pt (001) exhibits exotic dependencies on the current direction for all spin components, deviating from that in conventional cubic systems.
NATURE COMMUNICATIONS
(2023)
Article
Engineering, Electrical & Electronic
Peng Li, Bing Tian, Zhong Liu, Bofeng Luo, Xu Yin, Jiaming Zhang, Qiancheng Lv
Summary: This study discovers that the anomalous hall sensor based on NiCo2O4 thin film has controllable sensitivity and linear range, which can be adjusted by current. The device has a simple structure, interesting anomalous hall signal, and exhibits memory switching characteristic controlled by magnetic field.
IEEE ELECTRON DEVICE LETTERS
(2022)
Article
Physics, Multidisciplinary
Fan Lin, Mei Huang
Summary: This study investigates the leading order correction of anomalous magnetic moment (AMM) to electrons in a weak magnetic field and finds a negative and field-dependent magnetic correction, indicating a magnetic catalysis effect. In laboratory measurements, the magnetic correction to the AMM of electron/muon is negligible. However, when the magnetic field strength becomes comparable to the electron mass, the magnetic correction becomes significant. This general magnetic correction to charged fermions' AMM can be extended to the study of quantum chromodynamic matter under a strong magnetic field.
COMMUNICATIONS IN THEORETICAL PHYSICS
(2022)
Article
Astronomy & Astrophysics
Nilanjan Chaudhuri, Snigdha Ghosh, Pradip Roy, Sourav Sarkar
Summary: This study investigates the dependence of the constituent quark mass, pressure, magnetization, and magnetic susceptibility of strongly interacting quark matter on the magnetic field. It is found that these properties exhibit highly oscillatory behavior in the broken phase of chiral symmetry. However, the oscillations cease to occur when chiral symmetry is (partially) restored. The inclusion of the anomalous magnetic moment of the quarks modifies the variations of these properties near the chiral transition temperature. The magnetic susceptibility remains positive for a wide range of magnetic field values above the chiral transition temperature, indicating a paramagnetic character of the strongly interacting quark matter.
Article
Physics, Multidisciplinary
Silvia Manconi, Alessandro Cuoco, Julien Lesgourgues
Summary: Scientists have used synchrotron polarization for the first time to constrain the annihilation of dark matter. They found that synchrotron polarization is generally more constraining than synchrotron intensity, independent of uncertainties in electron and positron propagation models or the Galactic magnetic field. The bounds obtained in this study compete with cosmic microwave background limits, particularly in the case of leptophilic dark matter.
PHYSICAL REVIEW LETTERS
(2022)
Article
Geosciences, Multidisciplinary
S. Y. Wu, S. Y. Ye, G. Fischer, U. Taubenschuss, C. M. Jackman, E. O'Dwyer, W. S. Kurth, S. Yao, Z. H. Yao, J. D. Menietti, Y. Xu, M. Y. Long, B. Cecconi
Summary: A new radio component called Saturn Anomalous Myriametric Radiation (SAM) has been discovered using Cassini Saturn orbital data. SAM emissions are characterized by a central frequency near 13 kHz, a bandwidth greater than 8 kHz, and frequency drift over time. SAM is distinguished from regular emissions and is found to have a special connection to solar wind dynamics and magnetospheric conditions at Saturn.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Astronomy & Astrophysics
Minghua Wei, Chowdhury Aminul Islam, Mei Huang
Summary: Using current-current correlation function, the photon polarization tensor is computed for a rotating hot and dense QCD medium. The spectral function and dilepton rate are then estimated, showing enhancement in a rotating medium, especially at low invariant masses. The effects of angular velocity, temperature, and chemical potential on the spectral function and dilepton rate are explored. Electromagnetic screening is also investigated, with the calculation of Debye mass indicating suppression in a rotating QCD medium. The most interesting observation is the azimuthal anisotropy of dilepton production, where the elliptic flow v(2) induced by rotation as an external field exhibits a convex down behavior in the transverse momentum, due to competition between centrifugal effect and spin polarization effect.
Article
Materials Science, Multidisciplinary
D. S. Smirnov, A. Shumilin
Summary: In organic semiconductors, nuclear spin fluctuations lead to electric current noise, manifesting as pronounced magnetoresistance, with the current noise spectrum reflecting the role of nuclei in magnetoresistance through high-frequency peaks related to nuclear spin precession and low-frequency peaks related to nuclear spin relaxation, dependent on external magnetic and radio frequency fields.
Review
Physics, Multidisciplinary
Arpan Das, Hiranmaya Mishra
Summary: The article discusses the thermoelectric effects in hot and dense strongly interacting matter, estimating the Seebeck coefficients using the relativistic Boltzmann equation. Quark matter is modeled by the two flavor Nambu-Jona-Lassinio (NJL) model, while hadronic matter is modeled by the hadron resonance gas (HRG) model, with an estimation of transport coefficients and relaxation times. Additionally, the formalism of the thermoelectric effect in the presence of an external magnetic field is discussed, providing estimations for the magneto-Seebeck coefficient and the Nernst coefficient for hot and dense QCD matter.
EUROPEAN PHYSICAL JOURNAL-SPECIAL TOPICS
(2021)
Review
Astronomy & Astrophysics
Maria Paola Lombardo
Summary: This review examines the changes in topological fluctuations in different phases of strong interactions, focusing on the interrelation of topology, chiral symmetry and confinement in dense matter. Results show that the topological susceptibility appears to be suppressed at high temperatures for baryon and isospin rich matter, but the topological aspects of dense matter at low temperatures remain unclear and require further study.
Article
Astronomy & Astrophysics
Jens Braun, Benedikt Schallmo
Summary: This study estimates the phase structure at zero temperature of dense isospin-asymmetric matter with two quark flavors using constraints from the microscopic theory of the strong interaction. It finds indications of a first-order phase transition from a color-superconducting phase to an ungapped quark-matter phase as the density increases, with this transition absent in isospin-symmetric matter. The study also provides an estimate for the speed of sound in neutron-star matter, which exceeds the asymptotic value associated with noninteracting quark gas and increases toward lower densities.
Article
Physics, Particles & Fields
M. Jarvinen, E. Kiritsis, F. Nitti, E. Preau
Summary: This article uses a (toy) model for cold and luke-warm strongly-coupled nuclear matter at finite baryon density to study neutrino transport. The complete charged current two-point correlators are calculated in the strongly-coupled medium and their impact on neutrino transport is analyzed. The full result is compared with various approximations for the current correlators and the distributions, and their successes are commented on. Further improvements are also discussed.
JOURNAL OF HIGH ENERGY PHYSICS
(2023)
Article
Astronomy & Astrophysics
Paul Caucal, Yacine Mehtar-Tani
Summary: This study investigates the quantum corrections on the transverse momentum broadening of a fast parton passing through dense QCD matter. It is shown that, at leading logarithmic accuracy, the broadening distribution tends to a universal distribution that only depends on a single scaling variable at late times or for large system sizes. The typical transverse momentum scale increases with time, and the process exhibits super-diffusion. The scaling distribution also shows a heavy tail similar to Levy random walks at large transverse momentum.
Review
Physics, Multidisciplinary
Kai Hebeler
Summary: Recent advances in nuclear structure theory through ab initio many-body calculations have expanded the accessible part of the nuclear landscape, allowing for new microscopic studies. While different many-body methods show remarkable agreement, comparison with experiment and understanding theoretical uncertainties remain important. Efforts are being made to improve nuclear interactions and operators, including the systematic derivation of contributions using chiral effective field theory. Ongoing work focuses on improving the treatment of 3N interactions in ab initio frameworks to further advance our understanding of atomic nuclei.
PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS
(2021)
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.
