Tags » Mathematical Physics

A 3+1 formalism for quantum electrodynamical corrections to Maxwell equations in general relativity [HEAP]

http://arxiv.org/abs/1505.05847

Magnetized neutron stars constitute a special class of compact objects harbouring gravitational fields that deviate strongly from the Newtonian weak field limit. Moreover strong electromagnetic fields anchored into the star give rise to non-linear corrections to Maxwell equations described by quantum electrodynamics (QED). 211 more words

High Energy Astrophysical Phenomena

Lattice models in Florence

At the top of a hill south east of Florence, at the end of a long boulevard climbing up through pine, cypress and oak trees, is the Galileo Galilei Institute for Theoretical Physics. 309 more words

Condensed Matter Physics

Post-Newtonian effects on the stability of the triangular solution in the three-body problem for general masses [CL]

http://arxiv.org/abs/1505.04534

Continuing work initiated in earlier publications , we examine the post-Newtonian (PN) effects on the stability of the triangular solution in the relativistic three-body problem for general masses. 105 more words

Cross-listed

Sharp bounds on the radius of relativistic charged spheres: Guilfoyle's stars saturate the Buchdahl-Andréasson bound [CL]

http://arxiv.org/abs/1505.03863

Buchdahl, by imposing a few physical assumptions on the matter, i.e., its density is a nonincreasing function of the radius and the fluid is a perfect fluid, and on the configuration, such as the exterior is the Schwarzschild solution, found that the radius $r_0$ to mass $m$ ratio of a star would obey the Buchdahl bound $r_0/m\geq9/4$. 268 more words

Solar And Stellar Astrophysics

Mathematics for the fluid Earth

JPhysA are now accepting submissions for a new special issue on mathematics for the fluid Earth. The Earth is a rich system in which to study fluid mechanics, non-equilibrium statistical mechanics, nonlinearities and random processes, so we expect to get a very diverse spread of papers within the scope of the journal. 37 more words

Journal Of Physics A: Mathematical And Theoretical

how/why

A playfully serious theory of everything isn’t really an attempt to offer answers to the detailed question of how number theory and maths are connected to physics. 49 more words

Number Theory

Equivalent off-diagonal cosmological models and ekpyrotic scenarios in f(R)-modified, massive and Einstein gravity [CL]

http://arxiv.org/abs/1504.04346

We re-investigate how generic off-diagonal cosmological solutions depending, in general, on all spacetime coordinates can be constructed in massive and f-modified gravity using the anholonomic frame deformation method. 242 more words

Cosmology And Nongalactic Astrophysics