Three Impossible Theories

2021/07/24 by Leonard Susskind, Susskind, Leonard · 1 voice
Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #FOS: Physical sciences #General Relativity and Quantum Cosmology (gr-qc) #High Energy Physics - Theory (hep-th) #Relativity and Gravitational Theory #gr-qc #hep-th

paper · pdf · doi:10.48550/arxiv.2107.11688

12 pages, 4 figures

arxiv created 2021/07/24 · openalex publication_date 2021/07/24 · arxiv published 2021/07/24 · arxiv updated 2021/07/27 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

I will begin by conjecturing a cosmological generalization of black hole complementarity (also known as the central dogma). I will then discuss three theories and argue that they are inconsistent with second law of thermodynamics if the cosmological version of the dogma is correct. The three theories are: the big rip; cyclic cosmology; and the Farhi-Guth-Guven mechanism for creating inflating universes behind black hole horizons.

Citations

• The entropy of Hawking radiation

Discussions

• My question is related to a paper by Leonard Susskind in which he proposed an extension of the "central dogma" conjecture applied to black holes. This extension that he calls the "cosmological central [stackexchange, 0 points]

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