In this week’s Journal Club, we have

• Felipe Díaz (UNAB): “Thermal Fluctuations and Holographic Charged
  Renyi entropy”

Abstract: “Renyi entropies correspond to a one-parameter generalization
of Von-Neumann entropy but with some advantages; they are easier to
study, both numerically and experimentally. In the AdS/CFT context, they
have been also shown to provide great insights into the comprehension of
the entropy area law and in the black hole information problem. For a
CFT with a global symmetry, it is possible to extend the notion to the
so called “charged Renyi entropy” by means of a conformal map that leads
to a grand canonical partition function with a Wilson loop encircling
the entangling region. This quantity has been conjectured to be
holographically dual to charged black holes. In this talk we extend this
result to include nonlinear sources and compute the thermal fluctuations
on the gravity side. These corrections lead to a new logarithmic
divergence in the entanglement entropy which usually appear in a field
theory with spontaneous breaking of a continuous symmetry.”

• Anthony Osses (UC): “Breve introducción a las amplitudes celestiales:
  el plano complejo de los pesos conformes”

Abstract: “En esta charla se dará una breve introducción a “Amplitudes
celestiales”. Estas son una realización de holografia en espacios
asintoticamente planos que mapea amplitudes de scattering en 4D
funciones a funciones de correlación de una aún desconocida 2D CFT. Se
dará especial énfasis al rol que juega la estructura analítica de los
pesos conformes y cómo ésta conecta el IR y el UV de una nueva e
interesante manera.”