(2023-11-21) Seminar: João Penedones -- Bootstrapping the a-anomaly in 4d QFTs


João Penedones  教授学术报告

Title: Bootstrapping the a-anomaly in 4d QFTs

Speaker: Prof. João Penedones

Affiliation: École Polytechnique Fédérale de Lausanne, Switzerland (瑞士洛桑联邦理工学院

Time: 16:00-17:00, Tuesday, 21st November, 2023 (UTC+8, Beijing Time)

Venue: Zoom Meeting (ID: 385 442 0225; Passcode: yauc)

Inviter: Zhijin Li (李志金)


The space of 4d quantum field theories (QFTs) can be thought of as the Renormalization Group flows between Conformal Field Theories (CFTs). The a-theorem tells us that CFTs can be ordered by their a-anomaly value. I will explain how one can use the (numerical) S-matrix bootstrap methods to search for the minimal allowed value of the a-anomaly. I will also mention ongoing work to access the c-anomaly using probe gravitons.


João Penedones studied physics at the University of Porto where he obtained his degree in 2002. He then got the Certificate of Advanced Studies in Mathematics from the University of Cambridge in 2003. In 2007 he got the PhD from Universidade do Porto for his thesis “High Energy Scattering in the AdS/CFT Correspondence”. He then worked successively as a PostDoc until 2011 at the Kavli Institute for Theoretical Physics, University of California, Santa Barbara, and at the Perimeter Institute for Theoretical Physics, Waterloo, Canada. From 2011 to 2016 he was Research Fellow at the Universidade do Porto, Portugal.

In February 2016, he was appointed Professor in Physics at EPFL. Currently, he leads the “Fields and Strings Laboratory”.


The seminar will be broadcasted online by Zoom.

Interested people are free to join, without registration in advance.

The Zoom info is


Meeting ID: 385 442 0225

Passcode: yauc