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Snowmass White Paper: Cosmology at the Theory Frontier

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arxiv 2203.07629 v1 pith:YA6T5KIV submitted 2022-03-15 hep-th

Raphael Flauger , Victor Gorbenko , Austin Joyce , Liam McAllister , Gary Shiu , Eva Silverstein This is my paper · ORCID
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keywords theorycosmicstructurecosmologicalhorizonongoingsnowmassadmit
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The precision cosmological model describing the origin and expansion history of the universe, with observed structure seeded at the inflationary cosmic horizon, demands completion in the ultraviolet and in the infrared. The dynamics of the cosmic horizon also suggests an associated entropy, again requiring a microphysical theory. Recent years have seen enormous progress in understanding the structure of de Sitter space and inflation in string theory, and of cosmological observables captured by quantum field theory and solvable deformations thereof. The resulting models admit ongoing observational tests through measurements of the cosmic microwave background and large-scale structure, as well as through analyses of theoretical consistency by means of thought experiments. This paper, prepared for the TF01 and TF09 conveners of the Snowmass 2021 process, provides a synopsis of this important area, focusing on ongoing developments and opportunities.

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Cited by 4 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Effective Field Theory and In-In Correlators

    hep-th 2024-12 conditional novelty 7.0 of 10

    Matching in-in correlators between a full theory and its effective theory requires extra boundary terms in flat space, but those terms fade away in de Sitter space.

  2. Finite-cutoff Holographic Thermodynamics

    hep-th 2025-07 conditional novelty 6.0 of 10

    Finite-cutoff holography yields a thermodynamic duality between T^2-deformed CFTs and Schwarzschild-AdS black holes with a Dirichlet wall, including a teardrop coexistence curve with up to three states at one temperature.

  3. The Quantum Mechanics of Rare Events: From Quantum Walks to Stochastic Inflation

    hep-th 2026-08 conditional novelty 5.0 of 10

    Rare fluctuations in quantum walks are ruled by a measurement-induced relative entropy, and applying this to stochastic inflation yields a steady state that violates detailed balance.

  4. Machine Learning Gravity Compactifications on Negatively Curved Manifolds

    hep-th 2024-12 conditional novelty 5.0 of 10

    A neural network is trained to solve the Einstein equations on a Dehn-filled hyperbolic three-manifold, cutting the equation residual to about a percent and serving as a proof-of-concept for machine-learning gravity c...

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