Physical theories, eternal inflation, and the quantum universe

@article{Nomura2011PhysicalTE,
  title={Physical theories, eternal inflation, and the quantum universe},
  author={Yasunori Nomura},
  journal={Journal of High Energy Physics},
  year={2011},
  volume={2011},
  pages={1-68}
}
  • Y. Nomura
  • Published 12 April 2011
  • Physics
  • Journal of High Energy Physics
A bstractInfinities in eternal inflation have long been plaguing cosmology, making any predictions highly sensitive to how they are regulated. The problem exists already at the level of semi-classical general relativity, and has a priori nothing to do with quantum gravity. On the other hand, we know that certain problems in semi-classical gravity, for example physics of black holes and their evaporation, have led to understanding of surprising, quantum natures of spacetime and gravity, such as… 
Relativeness in quantum gravity: limitations and frame dependence of semiclassical descriptions
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A bstractWe present a coherent picture of the quantum mechanics of black holes. The picture does not require the introduction of any drastically new physical effect beyond what is already known; it
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Typical cosmological states have structure, obey to very good approximation the laws of classical physics on large scales, and are far from equilibrium. Typical quantum-mechanical states have none of
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Recently, a new framework for describing the multiverse has been proposed which is based on the principles of quantum mechanics. The framework allows for well-defined predictions, both regarding
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Author(s): Nomura, Y; Salzetta, N; Sanches, F; Weinberg, SJ | Abstract: © 2017 American Physical Society. We study a holographic theory of general spacetimes that does not rely on the existence of
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We consider the eternal inflation scenario of the slow-roll/chaotic type with the additional element of an objective collapse of the wave function. The incorporation of this new agent to the
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This is the first of a series of papers in which we use analyticity properties of quantum fields propagating on a spacetime to uncover a new multiverse geometry when the classical geometry has
Classical spacetimes as amplified information in holographic quantum theories
Author(s): Nomura, Y; Rath, P; Salzetta, N | Abstract: © 2018 authors. Published by the American Physical Society. We argue that classical spacetimes represent amplified information in the
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Motivated by the lessons of black hole complementarity, we develop a causal patch description of eternal inflation. We argue that an observer cannot ascribe a semiclassical geometry to regions
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