Gravitational collapse in repulsive $R+\mu^{4}/R$ R + μ 4 / R gravity

Spherical Collapse in ƒ(R) Gravity

We use one-dimensional numerical simulations to study spherical collapse in the ƒ(R) gravity models. We include the nonlinear self-coupling of the scalar field in the theory and use a relaxation scheme to follow the collapse. We find an unusual enhancement in density near the virial radius which may provide observable tests of gravity. We also use the estimated collapse time to calculate the cr...

Repulsive 1 / r 3 interaction

Solutions of the Schrödinger equation for 1/r-type longrange potentials play a key role in quantum physics especially in the understanding of states, both bound and continuum, that are close to a threshold @1–4#, and in the understanding of small-angle forward scattering which is dominated by contributions from large impact parameters. In the context of atomic collisions, it can be stated that ...

Stochastic background of gravitational waves ”tuned” by f(R) gravity

Gravitational collapse in loop quantum gravity

In this paper we study the gravitational collapse in loop quantum gravity. We consider the space-time region inside the Schwarzschild black hole event horizon and we divide this region in two parts, the first one where the matter (dust matter) is localized and the other (outside) where the metric is Kantowski-Sachs type. We calculate the state solving Hamiltonian constraint and we obtain a set ...

Fate of gravitational collapse in semiclassical gravity

Carlos Barceló, Stefano Liberati, Sebastiano Sonego, and Matt Visser Instituto de Astrof́ısica de Andalućıa, CSIC, Camino Bajo de Huétor 50, 18008 Granada, Spain International School for Advanced Studies, Via Beirut 2-4, 34014 Trieste, Italy and INFN, Sezione di Trieste Università di Udine, Via delle Scienze 208, 33100 Udine, Italy School of Mathematics, Statistics, and Computer Science, Victori...