Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology
Scientific paper
2010-12-21
Physik ohne Realit\"at: Tiefsinn oder Wahnsinn? (Springer 2012) pp. 201-216
Astronomy and Astrophysics
Astrophysics
General Relativity and Quantum Cosmology
20 pages pdf (including 3 figures). V2: Causal considerations that avoid the information loss paradox (Sect. 3) are made more
Scientific paper
Time-asymmetric spacetime structures, in particular those representing black holes and the expansion of the universe, are intimately related to other arrows of time, such as the second law and the retardation of radiation. The nature of the quantum arrow, often attributed to a collapse of the wave function, is essential, in particular, for understanding the much discussed "black hole information loss paradox". Any paradox can be avoided in a consistent causal treatment. The master arrow that would combine all arrows of time does not have to be identified with the direction of a formal time parameter that would allow us to formulate the dynamics as a succession of global states (a trajectory in configuration or Hilbert space). It may even change direction with respect to a fundamental physical clock, such as the cosmic expansion parameter, if this was extrapolated to negative "pre-big-bang" values.
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