Past Events

  • Experimental Particle Physics: "TBA"

    David Rittenhouse Laboratory, 4C8

    Alessandro Tricoli (Brookhaven National Laboratory)

  • High Energy Seminar: "Entanglement, Gravity, and Quantum Error Correction"

    David Rittenhouse Laboratory, 2N36

    Xi Dong (IAS)

    Over the last few years it has become increasingly clear that there is a deep connection between quantum gravity and quantum information. The connection goes back to the discovery that black hole entropy is given by the horizon area. I will present evidence that this is only the tip of the iceberg, and prove that a similar area law applies to more general Renyi entanglement entropies.

  • "Sounds of Silent: Listening to the Universe with Gravitational Waves”

    Penn Museum, Widener Lecture Room, University of Pennsylvania

    Prof. Dr. Alessandra Buonanno, Director at Max Planck Institute for Gravitational Physics, Head of the division Astrophysical and Cosmological Relativity

  • Department Colloquium: "The New Era of Gravitational-Wave Physics and Astrophysics"

    David Rittenhouse Laboratory, A8

    Alessandra Buonanno (MPI Munich) hosted by Justin Khoury

    The detection by LIGO of gravitational waves emitted by coalescing binary black holes heralded a new era in physics and astrophysics. I will review the theoretical work aimed at solving the two-body problem in General Relativity that has paved the way to observe such gravitational-wave signals and highlight the main implications of the discovery focusing on its astrophysical and fundamental physics aspects. I will also discuss the unique science that lies ahead of us with upcoming gravitational-wave observations.

  • Experimental Particle Physics: "TBA"

    David Rittenhouse Laboratory, 4C8

    Allison McCarn (University of Michigan)

  • Math-Bio seminar: "Robust and scalable inference of population history from hundreds of unphased whole-genomes"

    318 Carolyn Lynch Laboratory

    Jonathan Terhorst, University of California, Berkeley

    It has recently been demonstrated that inference methods based on genealogical processes with recombination can reveal past population history in unprecedented detail. However, these methods scale poorly with sample size, which limits resolution in the recent past, and they require phased genomes, which contain switch errors that can catastrophically distort the inferred history.

  • ADVANCES IN BIOMEDICAL OPTICS SEMINAR: "High-resolution Imaging of Cerebral Oxygen Metabolism and Hemodynamic Responses"

    Donner Auditorium, Basement, Donner Building, 3400 Spruce St.

    Sava Sakadzic (Harvard)

    The understanding of the cortical oxygen delivery and consumption on the microvascular scales may have profound implications for evaluating microvascular oxygen delivery capacity to support cerebral tissue metabolism in health and disease, and for quantitative interpretation of signals in macroscopic imaging modalities such as BOLD fMRI.

  • Condensed Matter seminar: "The crumpled state: crumpling dynamics and the evolution of damage networks"

    David Rittenhouse Laboratory, A4

    Shmuel Rubinstein, Harvard University

    The simple process of crumpling a sheet of paper with our hands results in a complex network of interconnected permanent creases of many sizes and orientations. Sheet preferentially bends along these creases, introducing history dependence to the process of crumpling. I will present an experimental study of the dynamics of crumpling. Specifically, I will first discuss how a crease network evolves when a thin elastoplastic sheet is repeatedly crumpled, opened up and then re-crumpled.

  • Astro Seminar: "The Cosmology Large Angular Scale Surveyor (CLASS)"

    David Rittenhouse Laboratory, A4

    David Chuss (Villanova)

    The LCDM model of cosmology has been successful in describing the universe’s energy content and evolution with six parameters; however, the observed geometric flatness of the universe, its near homogeneity, and the small deviation from scale invariance derived from the temperature anisotropy of the cosmic microwave background (CMB) have hinted that the universe underwent an inflationary epoch in its infancy.  Cosmic inflation is predicted to produce a background of gravitational waves that would polarize the CMB in a distinct pattern.

  • Math-Bio seminar: "Assessing the relationship of ancient samples to modern populations and to each other"

    318 Carolyn Lynch Laboratory

    Joshua Schraiber, Temple University

    When ancient samples are sequenced, one of the first questions asked is how those samples relate to modern populations and to each other. Commonly, this is assessed using methods such as Structure or Admixture, which model individuals as mixtures of latent "ancestry components". If an ancient individual is found to not carry similar ancestry components to a modern individual, that sample is considered to be not directly related to the modern individual.