Past Events

  • ADVANCES IN BIOMEDICAL OPTICS: Exploring Brain Interactions with Diffuse Optics

    B1 Stellar Chance Laboratories, 440 Curie Blvd

    Rickson Mesquita (University of Campinas)

    The human brain can be seen as a complex system due to its functional capabilities and structural organization. Indeed, previous works employing functional magnetic resonance imaging (fMRI) and electroencephalography (EEG) have shown several complex features of the brain.  In this talk I will approach how one can employ diffuse optics to reveal the brain's complex features during the resting state. In particular, I will discuss our recent results on the use of graph theory to characterize the spatial interactions of the healthy and the diseased brain. Last, I will explore potential clinical applications of our methodology, mostly on brain development and rehabilitation

    (Pizza will be served at 11:45 am)

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

    David Rittenhouse Laboratory, 4C8

    Zhilei Xu (Johns Hopkins University)

    Cosmology Large Angular Scale Surveyor (CLASS) is an array of telescopes to observe Cosmic Microwave Background (CMB) in Chile. CLASS will make large angular scale CMB polarization measurements in frequency bands at 40 GHz, 90 GHz, 150 GHz and 220 GHz. The five-year CLASS survey will constrain the tensor-to-scalar ratio at the 0.01 level, and also provide more information on reionization, the sum of neutrino mass and the Galactic interstellar medium. In my talk, I will introduce the science and design of CLASS experiment.

  • Special Condensed Matter Seminar: "Real-space imaging of a nematic quantum liquid"

    David Rittenhouse Laboratory, A4

    Ben Feldman, Princeton University

    Electronic phases in condensed matter systems generally respect the symmetries of their solid state host. However, interactions among electrons can give rise to a variety of exotic correlated states characterized by broken symmetry. An intriguing example is the formation of electron fluids with wave functions that spontaneously break the symmetry of the underlying lattice. These phases are quantum analogues of classical liquid crystals and have recently attracted interest across disparate platforms ranging from high-temperature superconductors to two-dimensional electron systems.

  • Astro Seminar: "Measuring the Polarized Cosmic Microwave Background with POLARBEAR and the Simons Array"

    David Rittenhouse Laboratory, A8

    Frederick Matsuda (University of California) hosted by Mark Devlin

    POLARBEAR is a high resolution polarization sensitive instrument in Chile currently observing the polarized Cosmic Microwave Background (CMB) signal in order to probe the physics of the early universe and inflation. POLARBEAR-2 and the Simons Array are next generation installments currently in development with vastly increased sensitivities that will achieve unprecedented constraints on cosmological parameters such as the tensor-to-scalar ratio and sum of the neutrino masses.

  • 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.

  • Experimental Particle Physics: "TBA"

    David Rittenhouse Laboratory, 4C8

    Allison McCarn (University of Michigan)

  • 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.