• Corpus ID: 247451057

Snowmass White Paper: Cosmology at the Theory Frontier

  title={Snowmass White Paper: Cosmology at the Theory Frontier},
  author={Raphael Flauger and Victor Gorbenko and Austin Joyce and Liam McAllister and Gary Shiu and E. Silverstein},
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… 

Effective field theories of gravity and compact binary dynamics: A Snowmass 2021 whitepaper

In this whitepaper, I describe modern applications of effective field theory (EFT) techniques to classical and quantum gravity, with relevance to problems in astrophysics and cosmology. As in

TASI Lectures on Cosmic Signals of Fundamental Physics

The history of the Universe and the forces that shaped it are encoded in maps of the cosmos. From understanding these maps, we gain insights into nature that are inaccessible by other means.

Snowmass White Paper: The Cosmological Bootstrap

This white paper summarizes recent progress in the cosmological bootstrap, an approach to the study of the statistics of primordial fluctuations from consistency with unitarity, locality and symmetry

Probing the initial state of inflation: analytical structure of cosmological correlators

: We study the analytic structure of in-in correlation functions in a deSitter background. The aim of this study is to probe the initial conditions for inflation through the features of correlation

Black hole to cosmic horizon microstates in string/M theory: timelike boundaries and internal averaging

: In this note, we resolve an apparent obstacle to string/M theory realizations of dS observer patch holography, finding a new role for averaging in quantum gravity. The solvable T ¯ T (+Λ 2 )

Snowmass White Paper: String Theory and Particle Physics

: We review recent developments and outstanding questions regarding connecting the top-down UV complete physical framework of string theory with the observed physics of the Standard Model and beyond

Report of the Topical Group on Cosmic Frontier 5 Dark Energy and Cosmic Acceleration: Cosmic Dawn and Before for Snowmass 2021

This report summarizes the envisioned research activities as gathered from the Snowmass 2021 CF5 working group concerning Dark Energy and Cosmic Acceleration: Cosmic Dawn and Before. The scientific

Detection of early-universe gravitational-wave signatures and fundamental physics

Detection of a gravitational-wave signal of non-astrophysical origin would be a landmark discovery, potentially providing a significant clue to some of our most basic, big-picture scientific

The inheritance of energy conditions: Revisiting no-go theorems in string compactifications

This work focuses on energy conditions as covariant and background independent consistency requirements in order to classify possible backgrounds coming from low-energy string theory in two steps, and shows how supergravity actions typically obey many relevant energy conditions, under some reasonable assumptions.

The role of dRGT mass terms in cutoff holography and the Randall--Sundrum II scenario

We show how the T 2 deformation of large N , holographic conformal field theories arise from coupling them to the quadratic mass term of ghost-free massive gravity. We then show that in a certain



TASI lectures on cosmological observables and string theory

These lectures provide an updated pedagogical treatment of the theoretical structure and phenomenology of some basic mechanisms for inflation, along with an overview of the structure of cosmological

Inflationary universe: A possible solution to the horizon and flatness problems

The standard model of hot big-bang cosmology requires initial conditions which are problematic in two ways: (1) The early universe is assumed to be highly homogeneous, in spite of the fact that

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

Cutting cosmological correlators

The initial conditions of our universe appear to us in the form of a classical probability distribution that we probe with cosmological observations. In the current leading paradigm, this probability

The Dangerous Irrelevance of String Theory

We comment on the relation between string theory and empirical science, grounding our discussion in cosmology, a subject with increasingly precise data in which this connection operates at several

Stochastic Inflation at NNLO

Stochastic Inflation is an important framework for understanding the physics of de Sitter space and the phenomenology of inflation. In the leading approximation, this approach results in a

PICO - the probe of inflation and cosmic origins

The Probe of Inflation and Cosmic Origins (PICO) is a NASA-funded study of a Probe-class mission concept. The toplevel science objectives are to probe the physics of the Big Bang by measuring or

Closed string tachyon condensation and worldsheet inflation

Closed string tachyon condensation in spacetime generates potentials on the worldsheet that model two-dimensional inflationary cosmology. These models illustrate and elucidate a variety of aspects of

The holographic spacetime model of cosmology

This essay outlines the Holographic Spacetime (HST) theory of cosmology and its relation to conventional theories of inflation. The predictions of the theory are compatible with observations, and one

Building a boostless bootstrap for the bispectrum

  • E. Pajer
  • Physics
    Journal of Cosmology and Astroparticle Physics
  • 2021
The observation of primordial correlators by cosmological surveys is a very promising avenue to probe high energies and the perturbative regime of quantum gravity. Hence, it is imperative that we