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It is shown how to set up a mathematically elegant and fully relativistic superfluid model that can provide a realistic approximation (neglecting small anisotropies due to crust solidity, magnetic fields, et cetera, but allowing for the…

天体物理学 · 物理学 2009-10-30 David Langlois , David M. Sedrakian , Brandon Carter

Even though the crystallize nature of the neutron star crust plays a pivotal role in describing various fascinating astrophysical observations, its microscopic structure is not fully understood in the presence of a colossal magnetic field.…

高能天体物理现象 · 物理学 2023-02-23 Vishal Parmar , H. C. Das , M. K. Sharma , S. K. Patra

We examine the roles the presence of hyperons in the cores of neutron stars may play in determining global properties of these stars. The study is based on estimates that hyperons appear in neutron star matter at about twice the nuclear…

天体物理学 · 物理学 2009-10-31 Shmuel Balberg , Itamar Lichtenstadt , Gregory. B. Cook

We investigate new solutions for magnetized neutron stars with a barotropic core in magnetohydrodynamic (MHD) equilibrium and a magneto-elastic crust, which was neglected by previous studies concerning stars in MHD equilibrium. The Lorentz…

高能天体物理现象 · 物理学 2023-01-04 Kotaro Fujisawa , Yasufumi Kojima , Shota Kisaka

The study of neutron stars is a topic of central interest in the investigation of the properties of strongly compressed hadronic matter. Whereas in heavy-ion collisions the fireball, created in the collision zone, contains very hot matter,…

太阳与恒星天体物理 · 物理学 2015-06-04 S. Schramm , V. Dexheimer , R. Negreiros , T. Schürhoff , J. Steinheimer

Torsional oscillations of magnetized neutron stars have been well studied since they may be relevant to the physical interpretation of some of the observed quasiperiodic oscillations in the magnetar giant flares. In the crustal region of a…

高能天体物理现象 · 物理学 2025-03-03 Ling Cheung , Lap-Ming Lin , Nicolas Chamel

Magnetic field evolution in neutron star cores is not fully understood. We describe the field evolution both for one barotropic fluid as well as two collisionally coupled barotropic fluids with different density profiles using the anelastic…

高能天体物理现象 · 物理学 2025-12-16 Andrei Igoshev , Nicolás A. Moraga , Andreas Reisenegger , Calum S. Skene , Rainer Hollerbach

We investigate the magneto--elastic equilibrium of a neutron star crust and magnetic energy stored by the elastic force. The solenoidal motion driven by the Lorentz force can be controlled by the magnetic elastic force, so that conditions…

高能天体物理现象 · 物理学 2022-01-19 Yasufumi Kojima , Shota Kisaka , Kotaro Fujisawa

We review selected aspects of the interior physics of compact stars, focusing on the microscopic and macroscopic manifestations of spin, magnetic fields, and nucleonic superfluidity and superconductivity. Spin statistics of fermions allows…

高能天体物理现象 · 物理学 2026-04-06 Armen Sedrakian , Peter B. Rau

We study the relative importance of several recent updates of microphysics input to the neutron star cooling theory and the effects brought about by superstrong magnetic fields of magnetars, including the effects of the Landau quantization…

高能天体物理现象 · 物理学 2018-06-13 A. Y. Potekhin , G. Chabrier

Correct interpretation of X-ray observations of transiently accreting neutron stars requires modeling of nuclear-physical processes in these objects. We consider a chain of nuclear reactions that drives the crust composition in an accreting…

太阳与恒星天体物理 · 物理学 2020-01-28 Nikolay N. Shchechilin , Andrey I. Chugunov

We consider the amplification and transport of a magnetic field in the collapsed core of a massive star, including both the region between the neutrinosphere and the shock, and the central, opaque core. An analytical argument explains why…

天体物理学 · 物理学 2009-11-06 Christopher Thompson , Norman Murray

The interiors of mature neutron stars are expected to be superfluid. Superfluidity of matter on the microscopic scale can have a number of large scale, potentially observable consequences, as the superfluid component of the star can now…

高能天体物理现象 · 物理学 2019-12-11 Vadym Khomenko , Marco Antonelli , Brynmor Haskell

We implement a semi-analytic approach for stability analysis, addressing the ongoing uncertainty about stability and structure of neutron star magnetic fields. Applying the energy variational principle, a model system is displaced from its…

太阳与恒星天体物理 · 物理学 2017-09-25 Marlene Herbrik , Kostas Kokkotas

Neutron stars are the endpoint of the life of intermediate mass stars and posses in their cores matter in the most extreme conditions in the universe. Besides their extremes of temperature (found in proto-neutron stars) and densities,…

高能天体物理现象 · 物理学 2018-06-07 R. O. Gomes , S. Schramm , V. Dexheimer

We investigate the influence of magnetic fields upon the dynamics of and resulting gravitational waves from a binary neutron star merger in full general relativity coupled to ideal magnetohydrodynamics (MHD). We consider two merger…

We present solutions for Hall equilibria applicable to neutron star crusts. Such magnetic configurations satisfy a Grad-Shafranov-type equation, which is solved analytically and numerically. The solutions presented cover a variety of…

太阳与恒星天体物理 · 物理学 2015-06-16 K. N. Gourgouliatos , A. Cumming , A. Reisenegger , C. Armaza , M. Lyutikov , J. A. Valdivia

We present a Newtonian multi-fluid formalism for superfluid neutron star cores, focussing on the additional dissipative terms that arise when one takes into account the individual dynamical degrees of freedom associated with the coupled…

太阳与恒星天体物理 · 物理学 2015-06-04 B. Haskell , N. Andersson , G. L. Comer

There has been much recent progress in our understanding of quark matter, culminating in the discovery that if such matter exists in the cores of neutron stars it ought to be in a color superconducting state. This paper explores the impact…

天体物理学 · 物理学 2008-11-26 F. Weber , R. Negreiros , P. Rosenfield , Andreu Torres i Cuadrat

We conduct force-free simulations of a single neutron star undergoing orbital motion in flat spacetime, mimicking the trajectory of the star about the center of mass on a compact binary system. Our attention is focused on the kinetic energy…

高能天体物理现象 · 物理学 2020-03-18 Federico Carrasco , Masaru Shibata