Article
Computer Science, Interdisciplinary Applications
Michael D. Shields, Dimitris G. Giovanis, V. S. Sundar
Summary: The paper proposes the use of an affine invariant ensemble MCMC sampler for conditional sampling to address extreme cases where subset simulation breaks down. The algorithm automatically varies step size and is particularly effective for estimating failure probabilities in strongly non-Gaussian and lower effective dimension scenarios.
COMPUTERS & STRUCTURES
(2021)
Article
Nanoscience & Nanotechnology
Settasit Chaikasetsin, Jun Young Jung, Hongdeok Kim, Brian S. Y. Kim, Jungju Seo, Joonmyung Choi, Kiho Bae, Woosung Park
Summary: In this study, a novel method is developed to directly probe the thermal expansion of nanoscale polymer films using an atomic force microscope and confining active thermal volume. It is found that the in-plane thermal expansion of the spin-coated poly-(methyl methacrylate) is enhanced by 20-fold compared to the out-of-plane expansion in confined dimensions. Molecular dynamics simulations show that the collective motion of side groups along backbone chains uniquely drives the enhancement of thermal expansion anisotropy in nanoscale polymers. This work unveils the intimate role of microstructure in the thermal-mechanical interaction of polymer films, paving a way to enhance the reliability of thin-film devices.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Physics, Applied
S. B. Fairchild, Thiago A. de Assis, J. H. Park, M. Cahay, J. Bulmer, D. E. Tsentalovich, Yee Sin Ang, L. K. Ang, J. Ludwick, T. C. Back, M. Pasquali
Summary: The study investigated the field electron emission properties of carbon nanotube films, revealing their anisotropic morphology. It was found that films with a parallel alignment configuration produced the highest emission currents. Compared to films with a perpendicular alignment configuration, those with a parallel alignment configuration exhibited less surface damage after field emission experiments.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Physics, Fluids & Plasmas
Samiran Ghosh
Summary: The transport properties of the weakly nonlinear two-dimensional quasilongitudinal dust lattice mode in a experimentally realized highly viscous, strongly coupled, weakly ionized plasma were studied. The dynamics of weakly nonlinear system is described by a 2D dissipative-dispersive nonlinear partial differential equation. Analytical and computational results predict strong viscosity induced Shilnikov homoclinic chaos that can trigger a phase transition.
Article
Astronomy & Astrophysics
Jin Hu, Shuzhe Shi
Summary: In this study, the multicomponent second-order dissipative relativistic hydrodynamic equations are derived using the moment-expansion method. By computing the transport coefficients using hard-sphere interactions, the role of multiple components and reactive collisions is investigated. It is found that both factors increase the effective cross section, leading to a decrease in transport coefficients and relaxation times. Furthermore, the transport properties are computed using leading-order perturbative QCD cross sections. For both types of cross sections, it is observed that the ratio between the vector current relaxation time and conductivity for a multicomponent fluid is notably different from that for a single-component fluid. Therefore, this study provides a more applicable guideline for such a ratio in phenomenological hydrodynamics simulations.
Article
Physics, Multidisciplinary
I. Ahmad Aslam, Z. Yousaf, M. O. Ahmad
Summary: This paper studies the effects of f(R, T, Q) gravity on the construction of modified scalar variables and their contribution to the expressions of the Raychaudhuri, shear, and Weyl scalar equations. The possible f(R, T, Q) structure scalars are constructed through the orthogonal decomposition of the Riemann tensor. The role of these variables is analyzed in the formulations of Weyl scalar, expansion, and shear evolution equations. The paper suggests that the structure scalars of f(R, T, Q) theory may be effective ingredients for studying Penrose-Hawking singularity theorems.
CHINESE JOURNAL OF PHYSICS
(2022)
Article
Chemistry, Multidisciplinary
Michael R. Scudder, Bin He, Yaxian Wang, Akash Rai, David G. Cahill, Wolfgang Windl, Joseph P. Heremans, Joshua E. Goldberger
Summary: Recent research has shown that single crystals of Re4Si7 exhibit comparable transverse thermoelectric efficiency to existing commercial materials, proving that electrical contacts are not needed at the hot side. This excellent performance is attributed to the large anisotropic thermopowers in the material, paving the way for unique device architectures for waste heat recovery in the future.
ENERGY & ENVIRONMENTAL SCIENCE
(2021)
Article
Materials Science, Multidisciplinary
Christoph Weigel, Hai Binh Phi, Felix Arthur Denissel, Martin Hoffmann, Stefan Sinzinger, Steffen Strehle
Summary: This study demonstrates a deep fluorine-based etching process for ULE 7972 glass, achieving a high etch rate and vertical sidewall angles, as well as high selectivity and comparability. By investigating the chemical surface composition, the impact of the etching process and tool configuration comparison is further explored, supporting the potential application of ULE glass microstructures in metrology and miniaturized precision applications.
ADVANCED ENGINEERING MATERIALS
(2021)
Article
Astronomy & Astrophysics
A. Emamian, A. F. Kord, A. Ghaani, B. Azadegan
Summary: In this study, we investigate the effects of the magnetic field on the expansion of hot and dense nuclear matter. By considering an inhomogeneous magnetic field generated by external sources, we examine the (1 + 2) dimensional longitudinally boost-invariant fluid expansion in a specific case. Our results depict the space-time evolution of the transverse expansion of the fluid in the presence of an inhomogeneous external magnetic field.
Article
Physics, Multidisciplinary
Travis Dore, Lorenzo Gavassino, David Montenegro, Masoud Shokri, Giorgio Torrieri
Summary: Different formulations of hydrodynamics are related to uncertainties in the definitions of local thermodynamic and hydrodynamic variables. This ambiguity can be resolved by viewing different formulations of hydrodynamics as particular gauge choices.
Article
Chemistry, Physical
Yiying Yan, Tadele T. Ergogo, Zhiguo Lu, Lipeng Chen, JunYan Luo, Yang Zhao
Summary: The study focuses on the vacuum Rabi splitting of a qubit ultrastrongly coupled to a cavity mode and a radiation reservoir, showing that the Lamb shift plays an essential role in modifying the coupling. As the cavity-qubit coupling increases, the emission spectrum undergoes changes with peaks narrowing and broadening until they have similar widths.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Mathematics
Guido Gentile, Faenia Vaia
Summary: In the presence of dissipation, the study focuses on quasi-periodically systems and the existence of response solutions with the same frequency vector as the forcing term. By analyzing non-simple zeroes and confining to two-dimensional frequency vectors for dealing with small divisors, the research shows that response solutions exist given certain conditions on the parameter and frequency vector. The existence of response solutions in a set with holes is obtained, with the requirement of non-resonance condition on the frequency for a connected set.
JOURNAL OF DIFFERENTIAL EQUATIONS
(2021)
Article
Physics, Applied
Meng Song, Jun Zhao, Caixing Liu, Miao He, Yihao Wang, Yuyan Han, Langsheng Ling, Liang Cao, Lei Zhang, Zhe Qu, Yimin Xiong
Summary: Understanding the magnetic properties and critical behavior of noncollinear itinerant magnet PrMn2Ge2 is essential for exploring spintronics devices based on topological spin textures. This work investigates the anisotropic magnetic properties and observes the antiferromagnetic to ferromagnetic transition induced by magnetic field and temperature. It is found that PrMn2Ge2 possesses multiple magnetic interactions, as indicated by the critical exponents and interaction function. The competition of these interactions in PrMn2Ge2 may be responsible for the skyrmionic bubbles observed at room temperature.
APPLIED PHYSICS LETTERS
(2022)
Article
Multidisciplinary Sciences
Huda Alalawi, Mubarak Alqahtani, Michael Strickland
Summary: This review presents the motivation for using relativistic anisotropic hydrodynamics to study the physics of ultrarelativistic heavy-ion collisions and highlights the main ingredients of the 3+1D quasiparticle anisotropic hydrodynamics model, as well as phenomenological comparisons with experimental data.
Article
Physics, Particles & Fields
Aleksandr Kovalenko, Andrei Leonidov
Summary: This article analyzes shock wave solutions in anisotropic relativistic hydrodynamics and describes a new phenomenon of angular deflection of the incident flow caused by the shock wave front related to anisotropy. The patterns of velocity and momentum transformation by the shock wave front are also described.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Article
Physics, Multidisciplinary
Samapan Bhadury, Wojciech Florkowski, Amaresh Jaiswal, Avdhesh Kumar, Radoslaw Ryblewski
Summary: In this study, equations for relativistic dissipative nonresistive magnetohydrodynamics are derived based on the kinetic theory description of massive spin-1/2 particles in the presence of a magnetic field. By using a relaxation-time approximation for the collision kernel in the relativistic Boltzmann equation and calculating nonequilibrium corrections to the phase-space distribution function of spin-polarizable particles, the framework naturally leads to the emergence of the well-known Einstein-de Haas and Barnett effects. The coupling between spin and magnetic field is shown to appear at gradient order in the hydrodynamic equation for the first time.
PHYSICAL REVIEW LETTERS
(2022)
Proceedings Paper
Physics, Multidisciplinary
Wojciech Florkowski, Avdhesh Kumar, Aleksas Mazeliauskas, Radoslaw Ryblewski
Summary: This article briefly reviews the thermal model predictions related to the longitudinal spin polarization of lambda hyperons emitted from a hot and rotating hadronic medium produced in non-central relativistic heavy-ion collisions.
ACTA PHYSICA POLONICA B PROCEEDINGS SUPPLEMENT
(2023)
Article
Astronomy & Astrophysics
Sourav Dey, Wojciech Florkowski, Amaresh Jaiswal, Radoslaw Ryblewski
Summary: The pseudogauge freedom or symmetry is an arbitrary choice in the redistribution of energy, linear momentum, and angular momentum. The canonical version of the spin tensor is advantageous in describing spin-polarization observables and fulfilling the algebra of angular momentum, which highlights the importance of connecting theory and experiment.
Article
Astronomy & Astrophysics
Rajesh Biswas, Asaad Daher, Arpan Das, Wojciech Florkowski, Radoslaw Ryblewski
Summary: We numerically solve the boost-invariant equations of spin hydrodynamics confined to the first-order terms in gradients. The spin equation of state is consistently included in the first order, which relates the spin density tensor to the spin chemical potential. Depending on the form and structure of the spin transport coefficients, we find solutions that are both stable and unstable within the considered evolution times of 10 fm/c. These findings complement the recent identification of stable and unstable modes for perturbed uniform spin systems described by similar hydrodynamic frameworks.
Article
Astronomy & Astrophysics
Asaad Daher, Arpan Das, Radoslaw Ryblewski
Summary: We study the stability of first-order dissipative spin-hydrodynamic frameworks. Two different frameworks are considered, one with a first-order spin-chemical potential and the other with a spin-chemical potential similar to first order. Linear perturbations reveal instabilities in spin modes for both cases. The Frenkel condition is used to eliminate these instabilities, but it has a physical drawback for the case with a spin-chemical potential similar to first order.
Article
Physics, Nuclear
Szymon Harabasz, Jedrzej Kolas, Radoslaw Ryblewski, Wojciech Florkowski, Tetyana Galatyuk, Malgorzata Gumberidze, Piotr Salabura, Joachim Stroth, Hanna Paulina Zbroszczyk
Summary: In this study, a spheroidal model of the expansion of hadronic matter produced in heavy-ion collisions in the few-GeV energy regime is proposed. This model is an extension of the spherically symmetric Siemens-Rasmussen blastwave model used in previous works and combines the spheroidal form of the expansion with a single-freeze-out scenario. The improved description of both the transverse-mass and the rapidity distributions of the produced particles is achieved. With the model parameters determined by the hadronic abundances and spectra, further predictions of the pion Hanbury-Brown-Twiss correlation radii are made and found to be in qualitative agreement with the measured ones. The successful description of the data supports the concept of spheroidal symmetry of the produced hadronic systems in this energy range.
Article
Physics, Multidisciplinary
Arpan Das, Wojciech Florkowski, Avdhesh Kumar, Radoslaw Ryblewski, Rajeev Singh
Summary: This study employs the Wigner function formalism to describe the quantum kinetic theory of interacting massive spin-half fermions. By utilizing the semi-classical expansion method, a set of generalized dynamical equations including spin are derived, establishing a framework for spin hydrodynamics.
ACTA PHYSICA POLONICA B
(2023)
Article
Astronomy & Astrophysics
Victor E. Ambrus, Radoslaw Ryblewski, Rajeev Singh
Summary: In this study, the propagation properties of spin degrees of freedom were analyzed within the framework of relativistic hydrodynamics. The analytical expression for the spin wave velocity was derived, showing that it approaches half the speed of light in the ultrarelativistic limit. It was found that only the transverse degrees of freedom propagate, similar to electromagnetic waves. Additionally, the effect of dissipative corrections and the damping coefficients for the case of Maxwell-Jüttner statistics were considered.
Article
Physics, Multidisciplinary
Arpan Das, Wojciech Florkowski, Radoslaw Ryblewski, Rajeev Singh
Summary: We analyzed the quantum features of baryon number fluctuations in subsystems of a hot and dense relativistic gas of fermions. Our findings show that the fluctuations in small systems differ significantly from the values known in statistical physics and diverge as the system size approaches zero. Numerical results obtained for a wide range of thermodynamic parameters expected in heavy-ion collisions are presented, which can provide new insights and interpretations of experimental data.
ACTA PHYSICA POLONICA B
(2022)
Article
Physics, Nuclear
Wojciech Florkowski, Avdhesh Kumar, Aleksas Mazeliauskas, Radoslaw Ryblewski
Summary: In this study, we use a thermal model to analyze the longitudinal polarization in a hot and rotating hadronic medium, considering the contribution of the thermal shear term. Our results show that the thermal shear term alone leads to the correct sign of the quadrupole structure in the longitudinal polarization, different from previous calculations that only considered the thermal vorticity. However, there is almost complete cancellation between the thermal shear and vorticity terms, resulting in disagreement with the experimental data. Further analysis reveals the role played by velocity and temperature gradient terms in the longitudinal polarization. Finally, replacing the mass term leads to agreement with the data.
Article
Astronomy & Astrophysics
Wojciech Florkowski, Radoslaw Ryblewski, Rajeev Singh, Gabriel Sophys
Summary: The evolution of spin polarization in the framework of hydrodynamics reveals that the nonboost invariant flow in the system leads to coupling between spin polarization components, impacting observables. The study of mean spin polarization vector for ? hyperons shows qualitative agreement with experiments and other models in terms of rapidity dependence of global spin polarization, with the absence of quadrupole structure in the longitudinal component at midrapidity. However, some nontrivial signals at forward rapidities are observed in comparison to results for Bjorken expansion.
