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Cosmological black holes and the direction of time

Romero, Gustavo E. and Perez, Daniela and Lopez Armengol, Federico (2018) Cosmological black holes and the direction of time. Foundations of Science, 23. pp. 415-426.

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Macroscopic irreversible processes emerge from fundamental physical laws
of reversible character. The source of the local irreversibility seems to be not in the
laws themselves but in the initial and boundary conditions of the equations that represent
the laws. In this work we propose that the screening of currents by black hole
event horizons determines, locally, a preferred direction for the flux of electromagnetic
energy. We study the growth of black hole event horizons due to the cosmological
expansion and accretion of cosmic microwave background radiation, for different
cosmological models. We propose generalized McVittie co-moving metrics
and integrate the rate of accretion of cosmic microwave background radiation onto
a supermassive black hole over cosmic time. We find that for flat, open, and closed
Friedmann cosmological models, the ratio of the total area of the black hole event
horizons with respect to the area of a radial co-moving space-like hypersurface always
increases. Since accretion of cosmic radiation sets an absolute lower limit to
the total matter accreted by black holes, this implies that the causal past and future
are not mirror symmetric for any spacetime event. The asymmetry causes a net Poynting
flux in the global future direction; the latter is in turn related to the ever increasing
thermodynamic entropy. Thus, we expose a connection between four different “time
arrows”: cosmological, electromagnetic, gravitational, and thermodynamic.

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Item Type: Published Article or Volume
Romero, Gustavo
Perez, Daniela
Lopez Armengol, Federico
Keywords: Black holes, Irreversibility, Cosmology
Depositing User: Prof. Dr. Gustavo E. Romero
Date Deposited: 23 May 2018 14:26
Last Modified: 23 May 2018 14:26
Item ID: 14699
Journal or Publication Title: Foundations of Science
DOI or Unique Handle:
Date: 2018
Page Range: pp. 415-426
Volume: 23

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