Multiverses and physical cosmology
@article{Ellis2003MultiversesAP, title={Multiverses and physical cosmology}, author={George F R Ellis and Ulrich Kirchner and William R. Stoeger}, journal={Monthly Notices of the Royal Astronomical Society}, year={2003}, volume={347}, pages={921-936} }
The idea of a multiverse – an ensemble of universes – has received increasing attention in cosmology, both as the outcome of the originating process that generated our own universe, and as an explanation for why our universe appears to be fine-tuned for life and consciousness. Here we carefully consider how multiverses should be defined, stressing the distinction between the collection of all possible universes, and ensembles of really existing universes that are essential for an anthropic…
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References
SHOWING 1-10 OF 55 REFERENCES
Predictions from quantum cosmology.
- PhysicsPhysical review letters
- 1995
The picture that has emerged from this line of development is that a small closed universe can spontaneously nucleate out of nothing, where by ‘nothing’ I mean a state with no classical space and time.
Is “the Theory of Everything” Merely the Ultimate Ensemble Theory?☆
- Physics
- 1997
Abstract We discuss some physical consequences of what might be called “the ultimate ensemble theory,”, where not only worlds corresponding to say different sets of initial data or different physical…
Cold big-bang cosmology as a counterexample to several anthropic arguments
- Physics
- 2001
A general Friedmann big-bang cosmology can be specified by fixing a half-dozen cosmological parameters such as the photon-to-baryon ratio ${\ensuremath{\eta}}_{\ensuremath{\gamma}},$ the cosmological…
From the big bang theory to the theory of a stationary universe.
- MathematicsPhysical review. D, Particles and fields
- 1994
It is shown that under certain conditions this process of the self-reproduction of the Universe can be described by a stationary distribution of probability, which means that the fraction of the physical volume of theiverse in a state with given properties does not depend on time, both at the stage of inflation and after it.
The emergent universe: inflationary cosmology with no singularity
- Physics
- 2002
Observations indicate that the universe is effectively flat, but they do not rule out a closed universe. The role of positive curvature is negligible at late times, but can be crucial in the early…
Testable anthropic predictions for dark energy
- Physics
- 2003
In the context of models where the dark energy density $\rD$ is a random variable, anthropic selection effects may explain both the "old" cosmological constant problem and the "time coincidence". We…
The Past attractor in inhomogeneous cosmology
- Mathematics
- 2003
We present a general framework for analyzing spatially inhomogeneous cosmological dynamics. It employs Hubble-normalized scale-invariant variables which are defined within the orthonormal frame…
Asymptotic dynamics of the exceptional Bianchi cosmologies
- Mathematics
- 2003
In this paper we give, for the first time, a qualitative description of the asymptotic dynamics of a class of non-tilted spatially homogeneous (SH) cosmologies, the so-called exceptional Bianchi…