Local Existence of Contact Discontinuities in Relativistic Magnetohydrodynamics

**magnetic**

**field**are continuous whereas the density, the entropy and the temperature may have a jump. Expand abstract.

**magnetic**

**field**are continuous whereas the density, the entropy and the temperature may have a jump. For the two-dimensional case, we prove the local-in-time existence in Sobolev spaces of a unique solution of the free boundary problem provided that the Rayleigh--Taylor sign condition on the jump of the normal derivative of the pressure is satisfied at each point of the initial discontinuity.

4/10 relevant

arXiv

Chromospheric Heating by Acoustic Waves Compared to Radiative Cooling: II -- Revised Grid of Models

**magnetic**

**field**and 70-90 % in regions where the magnetic field is inclined more than 50 degrees to the solar surface normal. Expand abstract.

**magnetic**

**field**and 70-90 % in regions where the

**magnetic**

**field**is inclined more than 50 degrees to the solar surface normal.

4/10 relevant

arXiv

Magnitude and direction of the local interstellar **magnetic** **field**
inferred from Voyager 1 and 2 interstellar data and global heliospheric model

**magnetic**

**field**. The constraints are based on analysis of the interstellar

**magnetic**

**field**components at the heliopause measured by magnetometer instruments on board Voyager 1 and 2 spacecraft. The analysis was performed with the help of our kinetic-magnetohydrodynamical (MHD) model of the global heliosphere. The model shows that the solar-induced disturbances of the interstellar

**magnetic**

**field**are extended relatively far from the Sun up to 400-500 AU. The

**field**is draped around the heliopause and compressed. By comparison of the model results with Voyager data we found that the model provides results comparable with the data for the interstellar

**magnetic**

**field**of $B_{LISM}$ = 3.7-3.8 $\mu$G in magnitude and directed towards $\approx$125$^\circ$ in longitude, and $\approx$37$^\circ$ in latitude in the heliographic inertial (HGI) coordinate system.

10/10 relevant

arXiv

Entanglement and Confinement in Coupled Quantum Systems

**magnetic**

**field**and harmonic oscillators. Such couplings make the ground states close to the thermofield double states of the uncoupled Hamiltonians. For the coupled SYK model, we push the numerical computation further towards the thermodynamic limit so that an extrapolation in the size of the system is possible. We find good agreement between the extrapolated numerical result and the analytic result in the large-$q$ limit. We also consider the coupled gauged matrix model and vector model, and argue that the deconfinement is associated with the loss of the entanglement, similarly to the previous observation for the coupled SYK model. The understanding of the microscopic mechanism of the confinement/deconfinement transition enables us to estimate the quantum entanglement precisely, and backs up the dual gravity interpretation which relates the deconfinement to the disappearance of the wormhole. Our results demonstrate the importance of the entanglement between the color degrees of freedom in the emergence of the bulk geometry from quantum

**field**theory via holography.

4/10 relevant

arXiv

Skyrmion-based **Magnetic** Traps for Ultracold Atoms

**magnetic**traps can be tuned by the external magnetic

**field**or device configuration. Expand abstract.

**field**generated by isolated

**magnetic**skyrmions can be used to trap ultracold atoms. Specially, ring-shaped and double-well trapping potentials for ultracold atoms can be created by combining the

**field**from two isolated skyrmions. The geometry size, potential barrier, trapping frequency and Majorana loss rate of these

**magnetic**traps can be tuned by the external

**magnetic**

**field**or device configuration. The results here could be useful to develop atomtronics devices by manipulating the

**magnetic**skyrmions with modern spintronics techniques.

4/10 relevant

arXiv

Effect of collisions on plasma sheath in the presence of a gradient
**magnetic** **field**

**magnetic**

**field**and ion-neutral collision frequency. Expand abstract.

**magnetic**

**field**. A single fluid hydrodynamic model is considered and the system of equations is solved numerically. The electrons are assumed to follow Boltzmann relation. The study reveals that the width of the plasma sheath expands and presheath length decreases with collisions. The ion-neutral collisions and gradient

**magnetic**

**field**restrict the ions to move towards the wall. The movement of the ions towards the wall can be controlled by choosing a suitable configuration of the

**magnetic**

**field**and ion-neutral collision frequency. The outcome of the study is supposed to help to understand the complex dynamics of ions in plasma confinement and plasma processing of materials.

10/10 relevant

arXiv

Ultimate precision of multi-parameter quantum magnetometry under the parallel scheme

**magnetic**

**field**under the parallel scheme and show that this lower bound can be achieved for sufficiently large N. Expand abstract.

**magnetic**

**field**is one of the most fundamental and important tasks in quantum metrology. Although extensive studies on quantum magnetometry have been carried out over past decades, the ultimate precision that can be achieved for the estimation of all three components of a

**magnetic**

**field**with entangled probe states under the parallel scheme remains unknown. Here we present the ultimate lower bound for the sum of arbitrarily weighted variances in the estimation of all three components of a

**magnetic**

**field**under the parallel scheme and show that this lower bound can be achieved for sufficiently large N. The optimal entangled probe state that achieves the ultimate precision is also explicitly constructed. The obtained precision sets the ultimate limit for the multi-parameter quantum magnetometry under the parallel scheme, which is of fundamental interest and importance in quantum metrology. Our approach also provides a way to characterize the tradeoff among the precisions of multiple parameters that arise from the constraints on the probe states.

7/10 relevant

arXiv

Odd triplet superconductivity induced by the moving condensate

**magnetic**

**field**. Expand abstract.

**magnetic**

**field**suppresses superconductivity by inducing the ordered motion of Cooper pairs. We demonstrate a mechanism which instead provides generation of superconducting correlations by inducing the motion of superconducting condensate. This effect arises in superconductor/ferromagnet heterostructures in the presence of Rashba spin-orbital coupling. We predict the odd-frequency spin-triplet superconducting correlations called the Berezinskii order to be switched on at large distances from the superconductor/ferromagnet interface by the application of a

**magnetic**

**field**. This is shown to result in the unusual behaviour of Josephson effect and local density of states in superconductor/ferromagnet structures.

4/10 relevant

arXiv

Non-equilibrium spin dynamics in the temperature and **magnetic** **field**
dependence of magnetization curves of ferrimagnetic Co1.75Fe1.25O4 and its
composite with BaTiO3

**field**cooled and field cooled) measurements and magnitude of

**magnetic**

**fields**. Expand abstract.

**magnetic**BaTiO3 (BTO) particles. The mixture of CFO and BTO structures has been confirmed by synchrotron X-Ray diffraction. The basic properties of ferrimagnetic CFO sample have been retained in the composite. However, a remarkable modification in

**magnetic**spin dynamics arises due to interfacial effect. The blocking phenomenon of ferrimagnetic domains below the room temperature has been tuned by varying the modes of (zero

**field**cooled and

**field**cooled) measurements and magnitude of

**magnetic**

**fields**. The non-equilibrium dynamics of

**magnetic**spin order has been examined by adopting unconventional protocols during recording of time dependent magnetization at different stages of the temperature and

**field**dependence of magnetization curves. The

**magnetic**relaxation followed exponential equation with two time constants. There are certain cases, where slow spin dynamics followed logarithmic function of time. The incorporation of off-

**field**relaxation experiments has made possible to tune

**magnetic**state and coercivity of the material. The systems showed various novel phenomena, including meta-stable

**magnetic**state, exchange bias effect, memory effect and training effect, which are of current interest for device applications of the

**magnetic**materials.

10/10 relevant

arXiv

Tuning of structural phase, **magnetic** spin order and electrical
conductivity in mechanical alloyed material of alpha-Fe2O3 and alpha-Cr2O3
oxides

**magnetic**

**field**induced spin flop transition has been observed at a critical magnetic field that depends on Cr content in the system. Expand abstract.

**magnetic**and electrical properties have been modified in the heat treated samples. For example, canted antiferromagnetic order has been appeared as an effect of heat treatment, irrespective of the Cr content in Fe1-xCrxO3. The

**magnetic**

**field**induced spin flop transition has been observed at a critical

**magnetic**

**field**that depends on Cr content in the system. The M\"ossbauer spectrum at room temperature has been fitted with two sextets. The variation of M\"ossbauer parameters suggest a distribution of

**magnetic**spin order between Fe and Cr ions in the rhombohedral structure of Fe1-xCrxO3. The electrical conductivity, derived from current-voltage characteristics of the heat treated samples, has been enhanced by increasing Cr content in alpha-Fe2O3 structure. The experimental results have been explained based on the theoretical models available in literature.

4/10 relevant

arXiv