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Amplitude constraints on dark energy

Scott Melville

Abstract

This talk gives a short introduction to the ``UV/EFT correspondence", which uses scattering amplitudes to relate the Effective Field Theory (EFT) coefficients probed by low-energy measurements to properties of the underlying high-energy (UV) completion. This includes recent ``positivity bounds" on EFT coefficients, which are the low-energy signatures of causality and unitarity in the UV. To illustrate their phenomenological impact, I apply these bounds to a simple EFT for dark energy and compare with recent cosmological observations.

Amplitude constraints on dark energy

Abstract

This talk gives a short introduction to the ``UV/EFT correspondence", which uses scattering amplitudes to relate the Effective Field Theory (EFT) coefficients probed by low-energy measurements to properties of the underlying high-energy (UV) completion. This includes recent ``positivity bounds" on EFT coefficients, which are the low-energy signatures of causality and unitarity in the UV. To illustrate their phenomenological impact, I apply these bounds to a simple EFT for dark energy and compare with recent cosmological observations.
Paper Structure (6 sections, 9 equations, 1 figure)

This paper contains 6 sections, 9 equations, 1 figure.

Table of Contents

  1. Introduction.
  2. UV/EFT Correspondence.
  3. Dark Energy.
  4. Conclusions.
  5. Acknowledgments.
  6. References.

Figures (1)

  • Figure 1: Observational constraints on the $\{ \alpha_B, c_T \}$ parameter space.Melville:2019wyy The positivity bounds (\ref{['eqn:pos_bounds']}) are satisfied in the green region. When implemented as a prior, they shift the posteriors from the orange to the purple intervals.