Past Events

  • High Energy Theory Seminar: (Stochastic Particle Production in the Early Universe)

    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)

    David Rittenhouse Laboratory, 2N36

    Walter Goldberger (Yale)

  • *Special* HET Seminar: "Bulk Entanglement Gravity"

    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 quantum-first perspective, in which our best description of the world is as a state vector evolving in Hilbert space.

  • HET & HEE Joint Seminar: (TBA)

    David Rittenhouse Laboratory, 4N12

    Michael Ramsey-Musolf (UMass Amherst)

  • HET & HEE Joint Seminar: "Cosmological Bounces and Wormholes from Vorticity"

    David Rittenhouse Laboratory, 4N12

    David Kaplan (John Hopkins University)

  • High Energy Theory Seminar: (TBA)

    David Rittenhouse Laboratory, 2N36

    Ted Jacobson (U of Maryland)

  • High Energy Theory Seminar: "Discrete Superconformal Matter"

    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 F-theory. For this, we consider smooth genus-one fibered and compact Calabi-Yau threefolds quotiented by a freely acting automorphism. The resulting geometries exhibit orbifold singularities in the base with so-called 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"

    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 real-world 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: "Coarse-Graining Holographic Entanglement"

    David Rittenhouse Laboratory, 2N36

    Netta Engelhardt (Princeton)

  • High Energy Theory Seminar: "Some New Mechanisms for Baryogenesis"

    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 scalar-tensor theories and the other using Lorentz violating theories.