Tootfinder

Second-order adiabatic expansions of heat and charge currents with nonequilibrium Green's functions
Sebasti\'an E. Deghi, Ra\'ul A. Bustos-Mar\'un
https://arxiv.org/abs/2404.16757

Second-order adiabatic expansions of heat and charge currents with nonequilibrium Green's functions
Due to technological needs, nanoscale heat management, energy conversion and quantum thermodynamics have become key areas of research, putting heat pumps and nanomotors center stage. The treatment of these particular systems often requires the use of adiabatic expansions in terms of the frequency of the external driving or the velocity of some classical degree of freedom. However, due to the difficulty of getting the expressions, most works have only explored first-order terms. Despite this, ad…

"Europe would cool dramatically and have less rainfall. While this might sound appealing compared with the current heating trend, the changes would hit 10 times faster than now, making adaptation almost impossible."
Yes, caused by global warming.
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Comparison of Empirical Models of Ionospheric Heating to Global Simulations
Fatemeh Bagheri, Ramon E. Lopez
https://arxiv.org/abs/2404.14330 https://

Comparison of Empirical Models of Ionospheric Heating to Global Simulations
Intense currents produced during geomagnetic storms dissipate energy in the ionosphere through Joule heating. This dissipation has significant space weather effects, and thus it is important to determine the ability of physics-based simulations to replicate real events quantitatively. Several empirical models estimate Joule heating based on ionospheric currents using the AE index. In this study, we select 11 magnetic storm simulations from the CCMC database and compare the integrated Joule heat…

Celestial soft currents at one-loop and their OPEs
Rishabh Bhardwaj, Akshay Yelleshpur Srikant
https://arxiv.org/abs/2403.10443 https://

Celestial soft currents at one-loop and their OPEs
Conformally soft operators and their associated soft theorems on the celestial sphere encode the low energy behaviour of bulk scattering amplitudes. They lead to an infinite dimensional symmetry algebra of the celestial CFT at tree-level. In this paper, we introduce new operators in the celestial CFT in order to extend the definition of conformally soft currents to include one-loop effects. We then compute their OPEs with other operators in the theory. We also examine new subtleties that arise …

This https://arxiv.org/abs/2307.03355 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_csRO_…

Optimized Path Planning for USVs under Ocean Currents
Unmanned Surface Vehicles (USVs) in the ocean environment, considering various spatiotemporal factors such as ocean currents and other energy consumption factors. The paper uses Gaussian Process Motion Planning (GPMP2), a Bayesian optimization method that has shown promising results in continuous and nonlinear motion planning algorithms. The proposed work improves GPMP2 by incorporating a new spatiotemporal factor for tracking and predicting ocean currents using a spatiotemporal Bayesian infere…

Celestial soft currents at one-loop and their OPEs
Rishabh Bhardwaj, Akshay Yelleshpur Srikant
https://arxiv.org/abs/2403.10443 https://

Celestial soft currents at one-loop and their OPEs
Conformally soft operators and their associated soft theorems on the celestial sphere encode the low energy behaviour of bulk scattering amplitudes. They lead to an infinite dimensional symmetry algebra of the celestial CFT at tree-level. In this paper, we introduce new operators in the celestial CFT in order to extend the definition of conformally soft currents to include one-loop effects. We then compute their OPEs with other operators in the theory. We also examine new subtleties that arise …

Canonical and Poynting currents in propagation and diffraction of structured light
Bohnishikha Ghosh, Anat Daniel, Bernard Gorzkowski, Aleksandr Y. Bekshaev, Radek Lapkiewicz, Konstantin Y. Bliokh
https://arxiv.org/abs/2402.10563

Canonical and Poynting currents in propagation and diffraction of structured light
Local propagation and energy flux in structured optical fields is often associated with the Poynting vector. However, the local phase gradient (i.e., local wavevector) in monochromatic fields in free space is described by another fundamental quantity: the canonical momentum density. The distributions of the Poynting and canonical momentum densities can differ significantly from each other in structured fields. We examine the role of these quantities in the propagation and diffraction of structu…

This https://arxiv.org/abs/2304.11349 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_mat…

Energy-minimizing torus-valued maps with prescribed singularities, Plateau's problem, and BV-lifting
In this paper, we investigate the relation between energy-minimizing torus-valued maps with prescribed singularities, the lifting problem for torus-valued maps in the space BV, and Plateau's problem for vectorial currents, in codimension one. First, we show that the infimum of the $W^{1,1}$-seminorm among all maps with values in the $k$-dimensional flat torus and prescribed topological singularities $S$ is equal to the minimum of the mass among all $\textit{normal}$ $\mathbb{R}^k$-currents, of …

This https://arxiv.org/abs/2308.03426 has been replaced.
initial toot: https://mastoxiv.page/@a…

Heat and charge transport in interacting nanoconductors driven by time-modulated temperatures
We investigate the quantum transport of the heat and the charge through a quantum dot coupled to fermionic contacts under the influence of time modulation of temperatures. We derive, within the nonequilibrium Keldysh Green's function formalism, generic formulas for the charge and heat currents by extending the concept of gravitational field introduced by Luttinger to the dynamically driven system and by identifying the correct form of dynamical contact energy. In linear response regime our form…

Gapless superfluidity in neutron stars: Thermal properties
Valentin Allard, Nicolas Chamel
https://arxiv.org/abs/2403.07766 https://a…

Gapless superfluidity in neutron stars: Thermal properties
The interior of mature neutron stars is expected to contain superfluid neutrons and superconducting protons. The influence of temperature and currents on superfluid properties is studied within the self-consistent time-dependent nuclear energy-density functional theory. We find that this theory predicts the existence of a regime in which nucleons are superfluid (the order parameter remains finite) even though the energy spectrum of quasiparticle excitations exhibits no gap. We show that the dis…

This https://arxiv.org/abs/2308.03426 has been replaced.
initial toot: https://mastoxiv.page/@a…

Heat and charge transport in interacting nanoconductors driven by time-modulated temperatures
We investigate the quantum transport of the heat and the charge through a quantum dot coupled to fermionic contacts under the influence of time modulation of temperatures. We derive, within the nonequilibrium Keldysh Green's function formalism, generic formulas for the charge and heat currents by extending the concept of gravitational field introduced by Luttinger to the dynamically driven system and by identifying the correct form of dynamical contact energy. In linear response regime our form…

This https://arxiv.org/abs/2305.17068 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_hept…

Completing the Bootstrap Program for $\mathrm{T}\bar{\mathrm{T}}$-Deformed Massive Integrable Quantum Field Theories
In recent years a considerable amount of attention has been devoted to the investigation of 2D quantum field theories perturbed by certain types of irrelevant operators. These are the composite field $\mathrm{T}\bar{\mathrm{T}}$ - constructed out of the components of the stress-energy tensor - and its generalisations - built from higher-spin conserved currents. The effect of such perturbations on the infrared and ultraviolet properties of the theory has been extensively investigated. In the con…

Understanding spin currents from magnon dispersion and polarization: Spin-Seebeck effect and neutron scattering study on Tb3Fe5O12
Y. Kawamoto, T. Kikkawa, M. Kawamata, Y. Umemoto, A. G. Manning, K. C. Rule, K. Ikeuchi, K. Kamazawa, M. Fujita, E. Saitoh, K. Kakurai, Y. Nambu
https://arxiv.org/abs/2404.01603

Understanding spin currents from magnon dispersion and polarization: Spin-Seebeck effect and neutron scattering study on Tb3Fe5O12
Magnon spin currents in the ferrimagnetic garnet Tb3Fe5O12 with 4f electrons were examined through the spin-Seebeck effect and neutron scattering measurements. The compound shows a magnetic compensation, where the spin-Seebeck signal reverses above and below Tcomp = 249.5(4) K. Unpolarized neutron scattering unveils two major magnon branches with finite energy gaps, which are well-explained in the framework of spin-wave theory. Their temperature dependencies and the direction of the precession …

This https://arxiv.org/abs/2305.17068 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_hept…

Completing the Bootstrap Program for $\mathrm{T}\bar{\mathrm{T}}$-Deformed Massive Integrable Quantum Field Theories
In recent years a considerable amount of attention has been devoted to the investigation of 2D quantum field theories perturbed by certain types of irrelevant operators. These are the composite field $\mathrm{T}\bar{\mathrm{T}}$ - constructed out of the components of the stress-energy tensor - and its generalisations - built from higher-spin conserved currents. The effect of such perturbations on the infrared and ultraviolet properties of the theory has been extensively investigated. In the con…

Parametric instability in a magnomechanical system
Takahiro Uto, Daigo Oue
https://arxiv.org/abs/2402.10796 https://arxiv.org/pdf/240…

Parametric instability in a magnomechanical system
We study parametric instability in a magnomechanical system, specifically examining magnon tunneling between moving ferromagnetic insulators. Our analysis reveals that quantum fluctuations generate spin currents above a critical velocity threshold, while no spin currents occur below this threshold at low temperatures. The critical velocity depends on magnon stiffness and Zeeman energy. Approaching the threshold, the spin current becomes divergent, linked to the PT-symmetry-breaking transition. …

Integral identities and universal relations for solitons
Christoph Adam, Alberto Garcia Martin-Caro, Carlos Naya, Andrzej Wereszczynski
https://arxiv.org/abs/2404.05789

Integral identities and universal relations for solitons
We show that any nonlinear field theory giving rise to static solutions with finite energy like, e.g., topological solitons, allows us to derive a continuous infinity of integral identities which any such solution has to obey. These integral identities can always be understood as being generated by field transformations and their related Noether currents. We also explain why all integral identities generated by coordinate transformations become trivial for Bogomolnyi-Prasad-Sommerfield (BPS) so…

This https://arxiv.org/abs/2303.06238 has been replaced.
initial toot: https://mastoxiv.page/@a…

Light-induced Nonlinear Spin Hall Current in Single-layer WTe$_2$
In this theoretical investigation, we analyze light-induced nonlinear spin Hall currents in a gated single-layer 1T$'$-WTe$_2$, flowing transversely to the incident laser polarization direction. Our study encompasses the exploration of the second and third-order rectified spin Hall currents using an effective low-energy Hamiltonian and employing Kubo's formalism. We extend our analysis to a wide frequency range spanning both transparent and absorbing regimes, investigating the influence of ligh…