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Gravitation
About: Gravitation is a research topic. Over the lifetime, 29306 publications have been published within this topic receiving 821510 citations.
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TL;DR: A class of scalar-tensor theories with coupling between the scalar and the Gauss-Bonnet invariant that exhibit spontaneous scalarization for both black holes and compact stars are identified.
Abstract: We identify a class of scalar-tensor theories with coupling between the scalar and the Gauss-Bonnet invariant that exhibit spontaneous scalarization for both black holes and compact stars. In particular, these theories formally admit all of the stationary solutions of general relativity, but these are not dynamically preferred if certain conditions are satisfied. Remarkably, black holes exhibit scalarization if their mass lies within one of many narrow bands. We find evidence that scalarization can occur in neutron stars as well.
481 citations
TL;DR: The cosmological equations suggested by the non-relativistic renormalizable gravitational theory proposed by Hořava are considered in this article, and it is pointed out that the early universe cosmology has features that may give an alternative to inflation and the theory may be able to escape singularities.
477 citations
TL;DR: In this paper, the authors compared the accuracy of the forces derived from several commonly used particle mesh schemes, showing how submesh resolution can be achieved by including short-range forces between particles by direct summation techniques.
Abstract: Techniques for carrying out large N-body simulations of the gravitational evolution of clustering in the fundamental cube of an infinite periodic universe are described and compared. The accuracy of the forces derived from several commonly used particle mesh schemes is examined, showing how submesh resolution can be achieved by including short-range forces between particles by direct summation techniques. The time integration of the equations of motion is discussed, and the accuracy of the codes for various choices of 'time' variable and time step is tested by considering energy conservation as well as by direct analysis of particle trajectories. Methods for generating initial particle positions and velocities corresponding to a growing mode representation of a specified power spectrum of linear density fluctuations are described. The effects of force resolution are studied and different simulation schemes are compared. An algorithm is implemented for generating initial conditions by varying the number of particles, the initial amplitude of density fluctuations, and the initial peculiar velocity field.
476 citations
TL;DR: In this paper, the authors considered the quantum creation of closed membranes by totally antisymmetric tensor and gravitational fields in arbitrary space-time dimension, and described the creation event by instanton tunneling.
475 citations
Book•
01 Oct 1998
TL;DR: In this paper, the Earth's gravity field is described as a non-Newtonian dynamical system, and the effects of external forces in the Kaon system are investigated.
Abstract: 1 Introduction.- 2 Phenomenological Description of Non-Newtonian Gravity.- 3 Searches for Composition-Independent Effects.- 4 Searches for Composition-Dependent Effects.- 5 Gravitational Properties of Antimatter.- 6 Effects of External Forces in the Kaon System.- 7 Spin-Dependent Intermediate-Range Forces.- 8 Epilogue.- A Gravity-Gradient Couplings to Torsion Pendants.- B Luther-Towler Cavendish Experiment.- C The Earth's Gravity Field.- Author Index.
473 citations