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    The apparent (gravitational) horizon in cosmology

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    Author
    Melia, Fulvio
    Affiliation
    Univ Arizona, Dept Phys, Appl Math Program
    Univ Arizona, Dept Astron
    Issue Date
    2018-08
    
    Metadata
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    Publisher
    AMER ASSOC PHYSICS TEACHERS
    Citation
    American Journal of Physics 86, 585 (2018); doi: 10.1119/1.5045333
    Journal
    AMERICAN JOURNAL OF PHYSICS
    Rights
    © 2018 American Association of Physics Teachers.
    Collection Information
    This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
    Abstract
    In general relativity, a gravitational horizon (more commonly known as the "apparent horizon") an imaginary surface beyond which all null geodesics recede from the observer. The Universe has an apparent (gravitational) horizon, but unlike its counterpart in the Schwarzschild and Kerr metrics, it is not static. It may eventually turn into an event horizon-an asymptotically defined membrane that forever separates causally connected events from those that are not-depending on the equation of state of the cosmic fluid. In this paper, we examine how and why an apparent (gravitational) horizon is manifested in the Friedmann-Robertson-Walker metric, and why it is becoming so pivotal to our correct interpretation of the cosmological data. We discuss its observational signature and demonstrate how it alone defines the proper size of our visible Universe. In so doing, we affirm its physical reality and its impact on cosmological models. (C) 2018 American Association of Physics Teachers.
    ISSN
    0002-9505
    1943-2909
    DOI
    10.1119/1.5045333
    Version
    Final accepted manuscript
    Sponsors
    Chinese Academy of Sciences [2012T1J0011]
    Additional Links
    http://aapt.scitation.org/doi/10.1119/1.5045333
    ae974a485f413a2113503eed53cd6c53
    10.1119/1.5045333
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