Particle horizon

About: Particle horizon is a research topic. Over the lifetime, 2096 publications have been published within this topic receiving 69137 citations.

Nonlocal forces of inertia in cosmology

Abstract: This paper reviews the origin of inertia according to Mach's principle and Weber's law of gravitation. The resulting theory is based on simultaneous nonlocal gravitational interactions between particles in the solar system and others in the remote universe beyond the Milky Way galaxy. It explains the precession of the perihelion of Mercury. A most important implication of the Mach-Weber theory of the force of inertia is the necessity for a large amount of uniformly distributed matter in the galactic universe. This matter could be the source of the cosmic background radiation. Nonlocal inertia forces are compatible with a static universe and also with an expanding universe but the latter would demand slow changes in the mass of particles and the gravitational constant.

Bound to bounce: a coupled scalar-tachyon model for a smooth cyclic universe

Abstract: We introduce a string-inspired model for a cyclic universe, utilizing the tachyonscalar coupling as well as contribution from curvature in a closed universe The universe undergoes a locked ination stage after each bounce Cycles of ination, decelerating expansion, followed by contraction are made possible because of the negative contribution to eective energy density by the curvature term No ghosts are ever generated at any point in the entire evolution of the universe The minimum size of the universe is nonzero for generic initial values of the scalar eld The Null, Weak, and Dominant Energy Conditions are not violated at the bounce points, contrary to many bounce models previously proposed And the Strong Energy Condition is satised in periods with tachyon matter domination

Big Bangs and Bounces on the Brane

Abstract: In view of our accelerating universe, one of the outstanding theoretical issues is the absence of a quantum-gravitational description of de Sitter space Although speculative, an intriguing circumvention may be found in the realm of brane-world scenarios; where the physical universe can be interpreted as a non-critical 3-brane moving in a higher-dimensional, static bulk In this paper, we focus on the cosmological implications of a positively curved brane world evolving in the background of a ``topological'' anti-de Sitter black hole (ie, Schwarzschild-like but with an arbitrary horizon topology) We show that the bulk black hole will typically induce either an asymptotically de Sitter ``bounce'' universe or a big bang/big crunch FRW universe, depending on a critical value of mass Interestingly, the critical mass is only non-vanishing in the case of a spherical horizon geometry We go on to provide a holographic interpretation of this curiosity