De Sitter Musings

Abstract

We discuss some of the issues that arise when considering the physics of asymptotically de Sitter spacetimes, and attempts to address them. Our development begins at the classical level, where several initial value problems are discussed, and ends with several proposals for holography in asymptotically de Sitter spacetimes. Throughout the paper we give a review of some basic notions such as the geometry of the Schwarzschild-de Sitter black hole, the Nariai limit, and quantum field theory in a fixed de Sitter background. We also briefly discuss some semiclassical aspects such as the nucleation of giant black holes and the Hartle-Hawking wavefunctional. We end by giving an overview of some open questions. An emphasis is placed on the differences between a static patch observer confined to live in a thermal cavity and the metaobserver who has access to a finite region of the future boundary.

Based on several talks given by the author. To be published in Int. J. Mod. Phys. A. v2: Minor typos corrected v3: Minor typos corrected

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• On the Equivalence between Euclidean and In-In Formalisms in de Sitter QFT
• Thermal derivation of the Coleman-De Luccia tunneling prescription
• Quasinormal modes of D-dimensional de Sitter spacetime
• Asymptotic Symmetries and Charges in De Sitter Space
• The Incompressible Navier-Stokes Equations From Black Hole Membrane Dynamics
• Recurrent Nightmares?: Measurement Theory in de Sitter Space
• Real Forms of Complex Higher Spin Field Equations and New Exact Solutions
• De Sitter Holography with a Finite Number of States
• Inflation and de Sitter Holography
• Cosmological Pair Production of Charged and Rotating Black Holes
• A de Sitter Farey Tail
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• A de Sitter Hoedown
• Semi-Lorentz invariance, unitarity, and critical exponents of symplectic fermion models
• The eternal fractal in the universe
• Holography For a De Sitter-Esque Geometry
• The nonlinear evolution of de Sitter space instabilities
• Quantum Topologically Massive Gravity in de Sitter Space
• Non-genericity of the Nariai solutions: I. Asymptotics and spatially homogeneous perturbations
• Non-genericity of the Nariai solutions: II. Investigations within the Gowdy class

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• Late-time Structure of the Bunch-Davies De Sitter Wavefunction
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• De Sitter Space and Entanglement
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• Holographic Complexity and de Sitter Space
• Higher Spin de Sitter Holography from Functional Determinants
• Amplitudes meet Cosmology: A (Scalar) Primer
• Comments on Entanglement Entropy in the dS/CFT Correspondence
• Topology of Future Infinity in dS/CFT
• Hyperbolic compactification of M-theory and de Sitter quantum gravity
• Quantum complexity in gravity, quantum field theory, and quantum information science
• Finite Features of Quantum De Sitter Space
• de Sitter Supersymmetry Revisited
• Cosmological Shapes of Higher-Spin Gravity
• Warped Entanglement Entropy
• Notes on Matrix Models
• On the mass of static metrics with positive cosmological constant - I
• Interpolating geometries and the stretched dS${}_2$ horizon
• Near-Extremal Limits of de Sitter Black Holes
• The Cosmological Switchback Effect
• Complex geodesics in de Sitter space
• Tensors and Spinors in de Sitter Space
• Equivalence of Emergent de Sitter Spaces from Conformal Field Theory
• On de Sitter future-past extremal surfaces and the "entanglement wedge"
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• Quasinormal Quantization in deSitter Spacetime
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• The Asymptotic Structure of Cosmological Integrals
• The Cosmological Switchback Effect II
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• The Wave Function of Quantum de Sitter
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• Late-time Structure of the Bunch-Davies FRW Wavefunction
• Decelerating cosmologies are de-scramblers
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• Cosmological Infrared Subtractions & Infrared-Safe Computables
• Hitchhiker's Guide to the Swampland: The Cosmologist's Handbook to the string-theoretical Swampland Programme
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