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Particle horizon
About: Particle horizon is a research topic. Over the lifetime, 2096 publications have been published within this topic receiving 69137 citations.
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TL;DR: A path-integral formulation for the wave function of the Universe which requires neither the Euclidean nor the conformal rotation is proposed.
Abstract: We propose a path-integral formulation for the wave function of the Universe which requires neither the Euclidean nor the conformal rotation. The boundary condition is taken to be that ``all possible boundaries are included.'' The resulting wave function in a simple model is shown to have the following properties: (i) the wave function tends to zero as the scale factor of the Universe tends to zero; (ii) in the semiclassical regime, it contains only the expanding component; (iii) it favors inflation.
9 citations
TL;DR: In this paper, the Kolmogoroff-Sinai entropy rate of the universe evolves in inverse proportion to the temperature, which results from a combination of nonlinear dynamics and quantum theory.
Abstract: Information in the universe evolves according to a nonlinear law, which results from a combination of nonlinear dynamics and quantum theory The Kolmogoroff-Sinai entropy rate of the Universe evolves in inverse proportion to the temperature Since the evolution of temperature is known from standard cosmology, the time dependence of the universal entropy rate can be determined and the temporal evolution of the universal information content can be calculated Information starts growing at the enormous rate of 1044 bits per second from an initial value of at least 2π (seven) bits at Planck time However, it reaches its contemporary value only if one or more inflationary phases have been passed by the Universe in the course of its evolution
9 citations
Journal Article•
9 citations
TL;DR: It is shown that in the brane-world settings the formulation of the quantum cosmology, including the problem of initial conditions, is conceptually more simple than in the (3+1)-dimensional case.
Abstract: We canonically quantize the dynamics of the brane universe embedded into the five-dimensional Schwarzschild-anti-de Sitter bulk space-time. We show that in the brane-world settings the formulation of the quantum cosmology, including the problem of initial conditions, is conceptually more simple than in the (3+1)-dimensional case. The Wheeler-DeWitt equation is a finite-difference equation. It is exactly solvable in the case of a flat universe and we find the ground state of the system. The closed brane universe can be created as a result of decay of the bulk black hole.
9 citations