# Some Thoughts on the Quantum Theory of de Sitter Space

@article{Banks2003SomeTO, title={Some Thoughts on the Quantum Theory of de Sitter Space}, author={Thomas Banks}, journal={arXiv: Astrophysics}, year={2003} }

This is a summary of two lectures I gave at the Davis Conference on Cosmic Inflation. I explain why the quantum theory of de Sitter (dS) space should have a finite number of states and explore gross aspects of the hypothetical quantum theory, which can be gleaned from semiclassical considerations. The constraints of a self-consistent measurement theory in such a finite system imply that certain mathematical features of the theory are unmeasurable, and that the theory is consequently…

## 51 Citations

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## 16 References

### M theory observables for cosmological space-times

- Physics, Mathematics
- 2001

We discuss the construction of the analog of an S-matrix for space-times that begin with a Big-Bang and asymptote to an FRW universe with nonnegative cosmological constant. When the cosmological…

### M-theory observables for cosmological space-times

- Physics, Mathematics
- 2001

: We discuss the construction of the analog of an S-matrix for space-times that begin with a Big-Bang and asymptote to an FRW universe with nonnegative cosmological constant. When the cosmological…

### De Sitter vacua in string theory

- Mathematics
- 2003

We outline the construction of metastable de Sitter vacua of type IIB string theory. Our starting point is highly warped IIB compactifications with nontrivial NS and RR three-form fluxes. By…

### The dS/CFT correspondence

- Mathematics, Physics
- 2001

A holographic duality is proposed relating quantum gravity on dSD (D-dimensional de Sitter space) to conformal field theory on a single SD−1 ((D-1)-sphere), in which bulk de Sitter correlators with…

### de Sitter black holes with either of the two horizons as a boundary

- Physics
- 2003

The action and the thermodynamics of a rotating black hole in the presence of a positive cosmological constant are analyzed. Since there is no spatial infinity, one must bring in, instead, a platform…

### Matrix model for de Sitter

- Physics
- 2001

Based on a heuristic boost argument, we propose that the 4 dimensional de Sitter space can be described by a spherical Chern-Simons matrix model near the cosmological horizon, or models generalizing…

### Cosmological Event Horizons, Thermodynamics, and Particle Creation

- Physics
- 1977

It is shown that the close connection between event horizons and thermodynamics which has been found in the case of black holes can be extended to cosmological models with a repulsive cosmological…

### Breaking SUSY on the Horizon

- Physics
- 2002

I present a heuristic calculation of the critical exponent relating the gravitino mass to the cosmological constant in a de Sitter universe. The ingredients for the calculation are the area law for…

### Disturbing Implications of a Cosmological Constant

- Philosophy
- 2002

In this paper we consider the implications of a cosmological constant for the evolution of the universe, under a set of assumptions motivated by the holographic and horizon complementarity…