High Energy Theory Lunchtime Seminar

semester, 2019


Friday, January 25th 2019
12:30 pm:
There is no seminar this week

Friday, February 1st 2019
12:30 pm:
Speaker: Asher Berlin (SLAC)
Subject: Thermal Relics Below an MeV

I will discuss a class of models in which thermal dark matter is lighter than an MeV. If dark matter thermalizes with the Standard Model below the temperature of neutrino-photon decoupling, constraints from measurements of the effective number of neutrino species are alleviated. This framework motivates new experiments in the direct search for sub-MeV thermal dark matter and light force carriers.


Friday, February 8th 2019
12:30 pm:
Speaker: Eric Braaten (Ohio State U.)
Subject: Axion Stars

The particle that makes up the dark matter of the universe could be an axion. A significant fraction of the axion dark matter could be in the form of bound Bose-Einstein condensates of axions. The condensates are called "axion stars" if they are bound by gravity and "oscillons" if they are self-bound. There may be aspects of axion dark matter in which the effects of axion stars and oscillons have not been fully taken into account.


Friday, February 15th 2019
12:30 pm:
Speaker: Andrew Long (U. Michigan)
Subject: Ultra-light dark photons from a network of cosmic strings

A variety of experimental efforts are currently underway to detect ultra-light dark photon dark matter — a spin-1 particle dark matter candidate with mass below 1 eV. However, dark photon dark matter has a notorious production problem: it is challenging to write down a model that yields the correct relic abundance of non-relativistic dark photons. In this talk I will discuss how dark photon dark matter is created from a network of near-global, Abelian-Higgs cosmic strings. These strings are expected to survive in the universe today, and their motions create a stochastic gravitational wave noise.


Friday, February 22nd 2019
12:30 pm:
High Energy Theory Lunchtime Seminar in Tate 110 (note location change for this week)
Speaker: Radu Roiban (Penn State)

Friday, March 1st 2019
12:30 pm:
Speaker: Ken Van Tilburg (IAS/New York U.)
Subject: TBA

Friday, March 8th 2019
12:30 pm:
Speaker: Jessica Turner (Fermilab)

Friday, March 15th 2019
12:30 pm:
Speaker: TBA
Subject: TBA

Friday, March 22nd 2019
12:30 pm:
Speaker: SPRING BREAK -- No seminar

Friday, March 29th 2019
12:30 pm:
Speaker: Vitaly Vanchurin (U. Minnesota, Duluth)
Subject: TBA

Friday, April 5th 2019
12:30 pm:
Speaker: Raymond Co (U. Michigan)
Subject: TBA

Friday, April 12th 2019
12:30 pm:
Speaker: Erich Poppitz (U. Toronto)
Subject: TBA

Friday, April 19th 2019
12:30 pm:
Speaker: Matt Reece (Harvard U.)
Subject: TBA

Friday, April 26th 2019
12:30 pm:
Speaker: Grant Remmen (UC Berkeley)
Subject: TBA

Friday, May 3rd 2019
12:30 pm:
Speaker: Sergei Dubovsky (NYU)

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