Joint Theory Seminar
Speaker:
Title:
Host:
Room: 432
User:
High-Energy Seminars
Time:
8:10am - 9:10am
Send Reminder:
Yes - 1 day 8 hour 0 minutes before start
Description:
HE Seminar
Speaker: Alexander Vikman
Title: Imperfect Dark Energy of Kinetic Gravity Braiding
Room: 416
Abstract: In this talk I will discuss a new class of cosmological scalar fields. Similarly to gravity, these theories are described by actions linearly depending on second derivatives. The latter can not be excluded without breaking the generally covariant formulation of the action principle. Despite the presence of these second derivatives the equations of motion are of the second order. Hence there are no new pathological degrees of freedom. Because of this structure of the theory the scalar field kinetically mixes with the metric - the phenomenon we have called Kinetic Gravity Braiding. These theories have rather unusual cosmological dynamics which may be useful to model Dark Energy and Inflation. I will discuss an equivalent hydrodynamical formulation of these theories, stability and causality for the fluid like configurations and cosmological applications.
Joint Theory Seminar
Speaker: Lloyd Knox
Title: First Data from Planck
Host: Luty
Room: 432
User:
High-Energy Seminars
Time:
8:10am - 9:10am
Send Reminder:
Yes - 1 day 8 hour 0 minutes before start
Description:
HE Seminar
Speaker: Graham Kribs
Title: Dark Matter Eschewing Astrophysics
Host: John Terning
Room: 416
I'll discuss what can be extracted from (a single observation of) nuclear recoil events at a direct detection experiment completely independent of astrophysics.
Joint Theory Seminar
Speaker: Matt Reece
Title: Low-Scale SUSY Breaking: Collider Physics and Cosmology
Host: John Terning
Room: 432
Abstract: In this talk I will discuss some distinctive phenomenology associated with low-scale breaking of supersymmetry (as in models of gauge mediation). I will explain some possible collider signatures at the LHC of long-lived neutralino NLSPs, which can decay to a Z or Higgs boson plus a gravitino on timescales of order the size of the detector. I will also argue that, without fine-tuning, low-scale breaking of supersymmetry will generically be associated with the presence of light moduli fields that pose cosmological problems. I will discuss how incorporating a QCD axion in this framework might lead to a relatively natural solution of these moduli problems, and how it might also be associated with exotic collider signatures involving axinos or other new weakly-coupled particles.
5:30am» Joint Theory Seminar