• Corpus ID: 236428207

Three Impossible Theories

  title={Three Impossible Theories},
  author={Leonard Susskind},
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. ar X iv :2 10 7. 11 68 8v 1 [ he pth ] 2 4 Ju l 2 02 1 

Figures from this paper

The central dogma and cosmological horizons

The central dogma of black hole physics — which says that from the outside a black hole can be described in terms of a quantum system with exp(Area / 4 G N ) states evolving unitarily — has recently

Encoding beyond cosmological horizons in de Sitter JT gravity

Black hole event horizons and cosmological event horizons share many properties, making it natural to ask whether our recent advances in understanding black holes generalize to cosmology. To this

A heuristic approach to the far-future state of a universe dominated by phantom energy

This work is based on a cosmological scenario of a universe dominated by phantom energy with equation of state parameter w < −1 and the analysis of its asymptotic behaviour in the far-future. The

The grand canonical Multiverse and the small cosmological constant

We consider the Multiverse as an ensemble of universes. Using standard statistical physics analysis we get that the Cosmological Constant (CC) is exponentially small. The small and finite CC is

A mechanism of baryogenesis for causal fermion systems

It is shown that the theory of causal fermion systems gives rise to a novel mechanism of baryogenesis. This mechanism is worked out computationally in globally hyperbolic spacetimes in a way which

A Tail of Eternal Inflation

Non-trivial inflaton self-interactions can yield calculable signatures of primordial nonGaussianity that are measurable in cosmic surveys. Surprisingly, we find that the phase transition to slow-roll

A Local Wheeler-DeWitt Measure for the String Landscape

According to the ‘Cosmological Central Dogma’, de Sitter space can be viewed as a quantum mechanical system with a finite number of degrees of freedom, set by the horizon area. We use this assumption



The stretched horizon and black hole complementarity.

Three postulates asserting the validity of conventional quantum theory, semiclassical general relativity, and the statistical basis for thermodynamics are introduced as a foundation for the study of

Quantization of false-vacuum bubbles: A Hamiltonian treatment of gravitational tunneling.

The quantization of spherically symmetric gravitational systems using the Dirac formalism and the WKB approximation is developed for the nucleation of false-vacuum bubbles, which may have been the origin of the inflationary universe and matter.

Phantom Energy and Cosmic Doomsday

Cosmologists have long wondered whether the Universe will eventually re-collapse and end with a Big Crunch, or expand forever, becoming increasingly cold and empty. Recent evidence for a flat

Eternal black holes in anti-de Sitter

We propose a dual non-perturbative description for maximally extended Schwarzschild Anti-de-Sitter spacetimes. The description involves two copies of the conformal field theory associated to the AdS