[NTU-NCTS String Seminar] An Area Law for Entanglement Entropy in Particle Scattering

  • Event Date: 2024-08-16
  • High energy theory
  • Speaker: Junsei Tokuda (IBS, Daejeon, CTPU)  /  Host: Prof. Yu-tin Huang
    Place: Rm. 815, Dept. of Physics, NTU

Title：An Area Law for Entanglement Entropy in Particle Scattering
Speaker：Junsei Tokuda (IBS, Daejeon, CTPU)
Date：2024/08/16 (Fri.)
Time：14:30
 
Abstract：
We study loop corrections to positivity bounds on gravitational EFTs in the presence of light particles. It has been observed that certain negative contributions to the positivity sum rule at low energies are enhanced by inverse powers of a small mass m. If one required them to cancel out with other low-energy contributions, one could yield important bounds on EFTs, such as the Weak Gravity Conjecture, or those which are useful for phenomenological searches of dark sector physics. In this talk, we uncover a natural mechanism through which 1/m-enhanced terms perfectly cancel between low and high energy contributions by considering a string-inspired model in which high-energy loops can be calculated using unitarity and Regge behavior of tree amplitudes. This concretely explains possible positivity violations in the presence of gravity from the high-energy viewpoint.

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