Joint Theory Seminar
Speaker:Andrei Khmelnitsky (ICTP Trieste)
Title: Relaxing the Cosmological Constant, Proof of Concept
Host:Verhaaren
Room: 432
Abstract: We propose a technically natural and phenomenological viable scenario whereby an initially large cosmological constant (c.c.) is relaxed down to the observed value due to the dynamics of a scalar evolving on a very shallow potential. The model crucially relies on a sector that violates the null energy condition (NEC) and gets activated only when the Hubble rate becomes sufficiently small — of the order of the present one. As a result of NEC violation, this low-energy universe evolves into inflation, followed by reheating and the standard Big Bang cosmology. Importantly, our model allows neither for eternal inflation and the current value of the c.c. is fixed by the parameters of the theory.
User:
High-Energy Seminars
Time:
5:30am - 6:30am
Send Reminder:
Yes - 3 days 4 hour 0 minutes before start
Description:
Joint Theory Seminar
Speaker:
Title:
Host:
Room: 432
Abstract:
User:
High-Energy Seminars
Time:
6:30am - 7:30am
Send Reminder:
Yes - 3 days 4 hour 0 minutes before start
Description:
Joint Theory Seminar
Speaker:Anson Hook (Stanford)
Title: Bounding Milli-magnetic charged particles
Host:Verhaaren
Room: 432
Abstract: Just like how milli-electric charged particles can exist, so can milli-magnetic charged particles. We review simple ways of evading the standard quantization arguments and why there are no model independent constraints on magnetically charged particles, milli-charged or not. We then provide the first ever model independent bounds coming from magnetar cooling arguments.
Description:
Earth Day
User:
High-Energy Seminars
Time:
5:30am - 6:30am
Send Reminder:
Yes - 3 days 4 hour 0 minutes before start
Description:
Joint Theory Seminar
Speaker:
Title:
Host:
Room: 432
Abstract:
April Fool's Day