UCL HEP Seminars
Seminars are generally held at 4pm on Fridays in room A1 on the top floor of the physics department
A calendar of all seminars in the Physics Department
is available on the Physics Events Calendar page.
If you use Google Calendar or similar, such as Apple iCal, it is possible to subscribe to this calendar via: XML, ICAL or HTML.
Please send suggestions for topics and/or speakers to Linda Cremonesi and Andreas Korn.
22-11-2019 : Lucas Lombriser (Geneva)
Towards Understanding the Cosmic Expansion at Late Times
I will first discuss how recent gravitational wave measurements have brought the predicted challenges to explaining cosmic acceleration by a modification of General Relativity as alternative to the cosmological constant. In a second part, I will describe a possible solution of the cosmological constant problem. I will show how interpreting the Planck mass in the Einstein-Hilbert action as a global Lagrange multiplier prevents vacuum energy from gravitating and with account of the inhomogeneous cosmic small-scale structure predicts an energy density parameter of the cosmological constant of 0.704, in good agreement with observations. Finally, I will argue that there is no Hubble tension. Rather, the discrepant measurements imply that we are located in a 50% underdense 40 Mpc region of the Cosmos, within cosmic variance and in good agreement with the measured local distributions of galaxies and clusters.
29-11-2019 : Ilektra Christidi (UCL)
Research Software Development Group
06-12-2019 : Tevong You (Cambridge)
13-12-2019 : Jessica Turner (FNAL)