Past Events

  • Department Colloquium: "Wave Piloting in the Marshall Islands"

    David Rittenhouse Laboratory, A8

    Professor John Huth (Harvard) Hosted by: Professor Joe Kroll

    Of all the Pacific Island navigation cultures, the practice of wave piloting in the Marshall Islands is perhaps the most curious. Navigators observed the patterns of ocean swells to find their way among atolls and islands in outrigger canoes.  Over a century of colonial occupation stretched this tradition to near extinction. Captain Korent Joel is the only living Marshall Islander with the traditional credential of rimeto (navigator).

  • Department Colloquium: "The Universe as a Lab for Fundamental Physics: Results from Spider and Future Suborbital Missions"

    David Rittenhouse Laboratory, A8

    William Jones (Princeton) Hosted by James Aguirre

    I will describe our recent results from observations of the Cosmic Microwave Background, including a status report on the recent flight of the Spider experiment, a balloon borne CMB polarimeter.  I will also discuss a convergence of observational needs and technological capabilities that provide intriguing opportunities for improving our understanding of both the late- and early-time evolution of the Universe.

     

    *Refreshments served @ 3:30pm, DRL 2nd Floor Faculty Lounge*

  • Department Colloquium: "Physics Opportunities at Future Circular Colliders"

    DRL A8

    Liantao Wang (U of Chicago) Hosted by Joe Kroll

    Following the discovery of the Higgs boson, there has been a lot discussion about the next step in high energy physics. Among different options, a couple of newly proposed next generation circular colliders, including FCC at CERN and CEPC/SPPC in China, have attracted a lot of attention. Through preliminary studies in the past couple of years, an exciting picture of their physics capabilities has emerged. In this talk, I will give an overview on this topic, focusing on some of the most important questions in high energy physics they can help addressing. 

  • Department Colloquium: "The Event Horizon Telescope: Imaging and Time-Resolving a Black Hole"

    David Rittenhouse Laboratory, A8

    Shep Doeleman (MIT) Hosted by James Aguirre

    A convergence of high bandwidth radio instrumentation and Global mm and submm wavelength facilities are enabling assembly of the Event Horizon Telescope (EHT): a short-wavelength Very Long Baseline Interferometry

  • Department Colloquium: "Spotting the Elusive Majorana Under the Microscope"

    DRL A8

    Ali Yazdani (Princeton University) Hosted by Eleni Katifori

    Topological superconductors are a distinct form of matter that is predicted to host boundary Majorana fermions. The search for Majorana quasi-particles in condensed matter systems is motivated in part by their potential use as topological qubits to perform fault-tolerant computation aided by their non-Abelian characteristics. Recently, we have proposed a new patform for the realization of Majorana fermions in condensed matter, based on chains of magnetic atoms on the surface of a superconductor.
  • Department Colloquium *Special*: "Solving the Solar Neutrino Problem"

    David Rittenhouse Laboratory, A8

    Joshua Klein (UPenn) Hosted by Gene Beier

    We will discuss the work of the Sudbury Neutrino Observatory, and the Penngroup in particular, that provided the solution to the long-standing Solar Neutrino Problem and which has been recognized this year by the Nobel Prize and the Breakthrough Prize. Some discussion of the implications of thesemeasurements and future directions will also be presented.

  • Rittenhouse Lecture:" Expansion of the Universe seen by Hubble"

    David Rittenhouse Laboratory, A8

    Adam Reiss (JHU/STScI) Hosted by Adam Lidz

    The Hubble constant remains one of the most important parameters in the cosmological model, setting the size and age scales of the Universe.  Present uncertainties in the cosmological model including the nature of dark energy, the properties of neutrinos and the scale of departures from flat geometry can be constrained by measurements of the Hubble constant made to higher precision than was possible with the first generations of Hubble Telescope instruments.  Streamlined distances ladders constructed from infrared observations of Cepheids and type Ia supernovae with ruthle

  • Department Colloquium: "Challenges for Cosmology on Galaxy Scales"

    David Rittenhouse Laboratory, A8

    Benoit Famaey (Strasbourg Observatory)

    While there is indisputable observational evidence for a new degree of freedom behaving as a collisionless fluid of particles on large scales, i.e. dark matter, there is no such solid evidence on galaxy scales. On the contrary, the current standard model of cosmology is plagued with numerous challenges at these scales, which we review here.

  • Physics Department Colloquium: "Fluid 'Ratchets' and Biological Locomotion"

    DRL A8

    Jun Zhang (NYU-Courant Institute)

    In this talk, I will discuss a few laboratory experiments that were inspired from examples of biological locomotion. There, solid structures were forced to interact with their surrounding fluid. These structures, or dynamic boundaries, interact with fluid in asymmetric fashions - either because of their anisotropic geometry or by the spontaneous breaking of symmetry in their response to the fluid. When subject to reciprocal forcing, the coupled systems behave in ways that can be described as 'fluid ratchets'.

  • Evolution Colloquium: "How Much Sex is Enough?"

    Carolyn Hoff Lynch Lecture Hall Chemistry Building, 231 S. 34th Street

    Professor Daniel S. Fisher (Stanford University)

    Sexual reproduction has many costs--especially the existence of lots of males, but sex, or more generally exchange of DNA is widely believed to have major advanages for evolution. Yet most of the arguments are rather qualitative: with multiple large and small numbers involved in evolutionary processes, quantitative understanding is essential...

     

    **Light Refreshments served @ 2:30pm**