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MHD equations are presented for the mixture of superfluid neutrons, superconducting protons, and normal electrons believed to exist in the outer cores of neutron stars. The dissipative effects of electron viscosity and mutual friction due…

Astrophysics · Physics 2009-10-30 Gregory Mendell

We argue that the recently reported Kolmogorov-like magnetic turbulence spectrum in the cool core of the Hydra A galaxy cluster can be understood by kinetic energy injection by active galaxies that drives a turbulent non-helical magnetic…

Astrophysics · Physics 2009-11-11 T. A. Ensslin , C. Vogt

We report the discovery of weak magnetic fields in three white dwarfs within the local 20pc volume (WD 0816-310, WD 1009-184, and WD 1532+129), and we confirm the magnetic nature of a fourth star (WD 2138-332) in which we had previously…

Solar and Stellar Astrophysics · Physics 2019-09-25 S. Bagnulo , J. D. Landstreet

Generally the virial theorem provides a relation between various components of energy integrated over a system. This helps us to understand the underlying equilibrium. Based on the virial theorem we can estimate, for example, the maximum…

Solar and Stellar Astrophysics · Physics 2020-10-21 Banibrata Mukhopadhyay , Arnab Sarkar , Christopher A. Tout

By numerical and analytical methods, we study in detail the effects of the Lifshitz dynamical exponent $z$ on the vector condensate induced by an applied magnetic field in the probe limit. Concretely, in the presence of the magnetic field,…

High Energy Physics - Theory · Physics 2014-05-20 Ya-Bo Wu , Jun-Wang Lu , Mo-Lin Liu , Jian-Bo Lu , Cheng-Yuan Zhang , Zhuo-Qun Yang

Quantum fluctuations become particularly relevant in highly frustrated quantum magnets and can lead to new states of matter. We provide a simple and robust scenario for inducing magnetic vortex crystals in frustrated Mott insulators. By…

Strongly Correlated Electrons · Physics 2014-03-04 Yoshitomo Kamiya , Cristian D. Batista

We calculate the minimal amount of large-scale poloidal magnetic field that has to thread the inner, radiation-over-gas pressure dominated region of a thin disk for its thermal stability. Such a net field amplifies the magnetization of the…

High Energy Astrophysical Phenomena · Physics 2017-02-22 Aleksander Sadowski

The convective envelopes of cool main-sequence stars harbour magnetic fields with a complex global and local structure. These fields affect the near-surface convection and the outer stellar atmospheres in many ways and are responsible for…

Solar and Stellar Astrophysics · Physics 2015-09-02 Benjamin Beeck , Manfred Schüssler , Robert H. Cameron , Ansgar Reiners

White dwarfs are excellent research laboratories as they reach temperatures, pressures, and magnetic fields that are unattainable on Earth. To better understand how these three physical parameters interact with each other and with other…

Solar and Stellar Astrophysics · Physics 2023-02-22 L. L. Amorim , S. O. Kepler , Baybars Külebi , S. Jordan , A. D. Romero

In the Fractional Quantum Hall state, we introduce a bi-local mean field and get vortex mean field solutions. Rotational invariance is imposed and the solution is constructed by means of numerical self-consistent method. It is shown that…

Condensed Matter · Physics 2017-02-01 Kenzo Ishikawa , Nobuki Maeda

We study the formation of vacuum condensates in $2+1$ dimensional QED in the presence of inhomogeneous background magnetic fields. For a large class of magnetic fields, the condensate is shown to be proportional to the inhomogeneous…

High Energy Physics - Theory · Physics 2009-10-28 Gerald Dunne , Theodore Hall

The evolution of the magnetic field of an accreting magnetic white dwarf with an initially dipolar field at the surface has been studied for non-spherical accretion under simplifying assumptions. Accretion on to the polar regions tends to…

High Energy Astrophysical Phenomena · Physics 2015-05-13 C. M. Zhang , D. T. Wickramasinghe , L. Ferrario

Sufficiently old white dwarfs cool down through a convective envelope that directly couples their degenerate cores to the surface. Magnetic fields may inhibit this convection by stiffening the criterion for convective instability. We…

Solar and Stellar Astrophysics · Physics 2024-09-13 Sivan Ginzburg

Observations of magnetic A, B and O stars show that the poloidal magnetic flux per unit mass has an upper bound of 10^-6.5 G cm^2/g. A similar upper bound is found for magnetic white dwarfs even though the highest magnetic field strengths…

Solar and Stellar Astrophysics · Physics 2015-06-17 Dayal T. Wickramasinghe , Christopher A. Tout , Lilia Ferrario

We numerically simulate vortex nucleation in a Bose-Einstein Condensate (BEC) subject to an effective magnetic field. The effective magnetic field is generated from the interplay between light with a non-trivial phase structure and the BEC,…

Other Condensed Matter · Physics 2007-09-07 D. R. Murray , P Öhberg , Damiá Gomila , Stephen M. Barnett

We observed a new mechanism for vortex nucleation in Bose-Einstein condensates (BECs) subject to synthetic magnetic fields. We made use of a strong synthetic magnetic field initially localized between a pair of merging BECs to rapidly…

Quantum Gases · Physics 2023-07-20 R. M. Price , D. Trypogeorgos , D. L. Campbell , A. Putra , A. Valdés-Curiel , I. B. Spielman

High-field magnetic white dwarfs have been long suspected to be the result of stellar mergers. However, the nature of the coalescing stars and the precise mechanism that produces the magnetic field are still unknown. Here we show that the…

Solar and Stellar Astrophysics · Physics 2012-09-13 E. García-Berro , S. Torres , P. Lorén-Aguilar , G. Aznar-Siguán , J. Camacho , B. Külebi , J. Isern , L. G. Althaus , A. H. Córsico

Superfluid $^3$He-B possesses three locally stable vortices known as a normal-core vortex ($o$-vortex), an A-phase-core vortex ($v$-vortex), and a double-core vortex ($d$-vortex). In this work, we study the effects of a magnetic field…

Superconductivity · Physics 2019-03-27 Kenichi Kasamatsu , Ryota Mizuno , Tetsuo Ohmi , Mikio Nakahara

Rotating magnetized white dwarfs are studied within the framework of general relativity using Hartle's formalism. Matter inside magnetized white dwarfs is described by an equation of state of particles under the action of a constant…

High Energy Astrophysical Phenomena · Physics 2019-02-18 Diana Alvear Terrero , Daryel Manreza Paret , Aurora Perez Martinez

The possibility of the formation of a condensate of charged spin-0 nuclei inside white dwarf cores, studied in arXiv:0806.3692 and arXiv:0904.4267, is pursued further. It has been shown, for cores composed mainly of one element (Helium or…

Solar and Stellar Astrophysics · Physics 2011-01-25 Mehrdad Mirbabayi