Past Events

High Energy Theory Seminar: (Stochastic Particle Production in the Early Universe)
April 23, 2018  2:00 pm
David Rittenhouse Laboratory, 2N36
Mustafa Amin (Rice University)
I will show some intriguing hints of universality in the occupation number of spectator/daughter fields that experience repeated stochastic particle production during inflation and reheating. The calculations are aided by a remarkable mathematical mapping between stochastic particle particle production in cosmology and current conduciton in disordered wires. Time permitting, I will discuss potential implications of the results for density perturbations from the early universe.

High Energy Theory Seminar: (TBA)
April 16, 2018  2:00 pm
David Rittenhouse Laboratory, 2N36
Walter Goldberger (Yale)

*Special* HET Seminar: "Bulk Entanglement Gravity"
April 11, 2018  1:00 pm
David Rittenhouse Laboratory, 4N12
Sean Carroll (Caltech)
Nature is quantum, but we human beings tend to think in terms of classical variables. I consider the emergence of spacetime and gravitation from a truly quantumfirst perspective, in which our best description of the world is as a state vector evolving in Hilbert space.

HET & HEE Joint Seminar: (TBA)
April 10, 2018  1:30 pm
David Rittenhouse Laboratory, 4N12
Michael RamseyMusolf (UMass Amherst)

HET & HEE Joint Seminar: "Cosmological Bounces and Wormholes from Vorticity"
March 27, 2018  1:30 pm
David Rittenhouse Laboratory, 4N12
David Kaplan (John Hopkins University)

High Energy Theory Seminar: (TBA)
March 26, 2018  2:00 pm
David Rittenhouse Laboratory, 2N36
Ted Jacobson (U of Maryland)

High Energy Theory Seminar: "Discrete Superconformal Matter"
March 19, 2018  2:00 pm
David Rittenhouse Laboratory, 2N36
Paul Oehlmann (Virginia Tech)
We construct a novel type of (2,0) discrete charged superconformal matter coupled to 6d supergravity using Ftheory. For this, we consider smooth genusone fibered and compact CalabiYau threefolds quotiented by a freely acting automorphism. The resulting geometries exhibit orbifold singularities in the base with socalled multiple fibers over them which is where the (2,0) discrete charged matter resides. We show this presence to be necessary for anomaly cancellation which we proof in generality.

HET & HEE Joint Seminar: "Unification from Scattering Amplitudes"
March 13, 2018  1:30 pm
David Rittenhouse Laboratory, 4N12
Cliff Cheung (Caltech)
Scattering amplitudes are fundamental observables that encode the dynamics of interacting particles. In this talk, I describe how to systematically construct these objects without reference to a Lagrangian or an underlying spacetime. The physics of realworld particles like gravitons, gluons, and pions are thus derived from the properties of amplitudes rather than vice versa. Remarkably, the expressions gleaned from this line of attack are marvelously simple, revealing new structures long hidden in plain sight.

High Energy Theory Seminar: "CoarseGraining Holographic Entanglement"
March 12, 2018  2:00 pm
David Rittenhouse Laboratory, 2N36
Netta Engelhardt (Princeton)

High Energy Theory Seminar: "Some New Mechanisms for Baryogenesis"
February 26, 2018  2:00 pm
David Rittenhouse Laboratory, 2N36
Jeremy Sakstein (U of Penn)
There is more matter than antimatter in the universe, and the origin of this asymmetry is still a mystery. The asymmetry can be generated dynamically in the early universe in a process referred to as baryogenesis but the standard model is not able to produce the amount observed. This is one hint that there is physics beyond the standard model. In this talk, I will present two new baryogenesis mechanisms, one using scalartensor theories and the other using Lorentz violating theories.