Law of elasticity and fracture limit of magnetic forcelines under their gravitational deformation

Abstract

Magnetic fields are a very special form of elastic medium. Within astrophysical environments (magnetised stars and protogalaxies) they counteract shear and rotational distortions as well as gravitational collapse. Their vector nature allows for their extraordinary coupling with spacetime curvature in the framework of general relativity. This particular coupling points out the way to study magnetic elasticity under gravitational deformation. In this context, we reveal their law of elasticity, calculate their fracture limit and subsequently argue that they ultimately lose the battle against gravitational contraction of magnetised matter. Two illustrative applications, in a neutron star and a white dwarf, accompany the results.

18 pages, no figures, minor corrections

References in corpus (4)

• Relativistic cosmology and large-scale structure
• Raychaudhuri's equation and aspects of relativistic charged collapse
• Melvin's "magnetic universe", the role of the magnetic tension and the implications for gravitational collapse
• How the magnetic field behaves during the motion of a highly conducting fluid under its own gravity--A new theoretical, relativistic approach