Links to Colloquia

Past years' colloquia

List of past colloquia videos (Restricted: Only members of the Brandeis community can view this list and access the videos)

Eisenbud Lecture Series in Mathematics and Physics

Berko Symposium

All colloquium videos are under copyright and may not be reproduced, in part or in total, without written permission of the speaker and of the Physics Department.

Department Colloquia

Martin Weiner Lecture Series
Department of Physics Colloquium
4 pm, Abelson 131
Refreshments at 3:30 pm outside Abelson 131

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Fall 2018 Colloquia

Tuesday, September 4, 2018
Marcelle Soares-Santos, Brandeis
"Cosmology in the era of multi-messenger astronomy with gravitational waves"
Abstract: Motivated by the exciting prospect of a new wealth of information arising from the first observations of gravitational and electromagnetic radiation from the same astrophysical phenomena, the Dark Energy Survey (DES) has established a search and discovery program for the optical transients associated with LIGO/Virgo events using the Dark Energy Camera (DECam). This talk presents the discovery of the optical transient associated with the neutron star merger GW170817 using DECam and discusses its implications for the emerging field of multi-messenger cosmology with gravitational waves and optical data.

Tuesday, September 11, 2018
No colloquium (Rosh Hashanah)

Tuesday, September 18, 2018
David Roberts, Brandeis
"X-Shaped Radio Galaxies and the Low Frequency Gravitational Wave Background"
Abstract: The collision and coalescence of supermassive black holes (SMBHs), such as those that lie at the heart of every galaxy, are expected to produce an enormous flux of gravitational waves (GWs) at very low frequencies (on the order of nanohertz, wavelengths of parsecs). The required pairs of SMBHs are presumably formed after the merger of two large galaxies to create a single larger galaxy initially containing two SMBHs. These each are expected to travel to the dynamical center of the resulting galaxy and eventually merge. The ensemble of such collisions should produce a GW background that is detectable using pulsar timing arrays (PTAs). However, current observational limits from the Australian PTA on the low frequency GW background lie below the levels expected based on theoretical considerations of the rate of such SMBH collisions. We have undertaken a project to study the fraction of large galaxies that harbor a pair of SMBHs using the structure of radio galaxies (RGs) as signposts. Out of a sample of over 1600 bright RGs Cheung selected 100 candidates that showed structures that suggested possible disruption of the central BHs. We have used the Jansky Very Large Array to make multi-frequency multi-array images of these "X-shaped radio galaxies" (XRGs) and created a well-studied sample of 87. Analysis of their structures suggests that most are created by backflow from the extended lobes. However, a small fraction (>=4%) show clear evidence for precession of the BH axis, presumably driven by interactions with a nearby second SMBH. We conclude that study of the structure of XRGs is useful in the search for binary SMBHs, and that such searches can help set limits on the expected low-frequency GW background.

Tuesday, September 25, 2018
No colloquium (Brandeis Monday)

Tuesday, October 2, 2018
Stefan Söldner-Rembold, University of Manchester
"DUNE – an International Neutrino Observatory"
Abstract: The Deep Underground Neutrino Experiment (DUNE) will be an international observatory for neutrino science, designed, constructed and operated by a global collaboration of scientists. Primary science drivers are the discovery of CP violation in the neutrino sector, the detection of neutrinos from supernovae, and the search for baryon number violation. DUNE will consist of two neutrino detectors placed in the world’s most intense neutrino beam. A near detector will record particle interactions near the source of the beam at Fermilab close to Chicago. A second, much larger, far detector operating with more than 40 kt of liquid-argon will be installed a mile underground in South Dakota. Several mid-size liquid-argon detectors at Fermilab and CERN are being constructed to demonstrate the potential of the cutting-edge liquid-argon technology employed for DUNE. I will introduce the technology and give an overview of the current status and future discovery potential of the DUNE programme.

Tuesday, October 9, 2018
Kerstin Perez, Massachusetts Institute of Technology
"In Search of Cosmic-Ray Antinuclei from Dark Matter"
Abstract: Cosmic-ray antiprotons have been a valuable tool for dark matter searches since the 1970s. Recent years have seen increased theoretical and experimental effort towards the first-ever detection of cosmic-ray antideuterons, in particular as an indirect signature of dark matter annihilation or decay in the Galactic halo.  In contrast to other indirect detection signatures, which have been hampered by the large and uncertain background rates from conventional astrophysical processes, low-energy antideuterons provide an essentially background-free signature of dark matter, and low-energy antiprotons are a vital partner for this analysis.  I will discuss the upcoming balloon-borne GAPS experiment, which exploits a novel detection technique utilizing exotic atom capture and decay to provide sensitivity to antiproton, antideuteron, and antihelium cosmic-ray signatures.  In particular, I will detail the fabrication of the lithium-drifted Silicon detectors that are essential to its success.

Tuesday, October 16, 2018
(No colloquium this week)

Tuesday, October 23, 2018
Greg Landsberg, Brown University
"New ideas in searches for new physics at the LHC"
Abstract: With any evidence for new physics yet to be found at the LHC, there has been a significant shift in both the direction of searches for new physics and the methods used to purse them. With no clear peaking excesses and only mild hints for any deviations from the standard model in the LHC data, we are pursuing new avenues of searches by looking at the places missed both by the early LHC running and by previous machines. Many of these new searches required a significant development of new experimental and theoretical tools. Using mainly CMS as an example, I'll discuss these new directions in our quest for new physics and show a few recent results illustrating their power and novelty.

Tuesday, October 30, 2018
Ian Crossfield, Massachusetts Institute of Technology
"Infrared Spectroscopy of Stars and Planets"
Abstract: Extrasolar planets and cool stars emit most of their light beyond the range of standard optical observations.  These objects are often best studied using infrared spectroscopy.  I will present recent results from my group on two topics: space-based IR spectroscopy of exoplanet atmospheres, and ground-based, high-resolution spectroscopy of both planets and stars.  I will also conclude with a brief discussing of how future IR-optimized observatories will also enable exciting new science in these areas.

Tuesday, November 6, 2018
Prineha Narang, Harvard University
Title and Abstract: TBA

Tuesday, November 13, 2018 to Thursday, November 15, 2018
Eisenbud Lecture Series in Mathematics and Physics
Spencer Bloch, Yau Mathematical Sciences Center, Tsinghua University

Tuesday, November 13 (Lecture I), 4:00pm, Abelson 131
"Multiple Zeta Values and Mixed Tate Motives over ℤ"
Abstract: Basic ideas and results in the subject. Nilpotent completion of π1(ℙ1- {0, 1, ∞}, ⃗0 multiple zeta values, F. Brown's theorem on mixed Tate motives over ℤ.

Wednesday, November 14 (Lecture II), 4:00pm, Brown 316
"Motivic Г-functions"
Abstract: (Joint work with F. Brown and M. Vlasenko) Motivic Г functions are Mellin transforms of period functions. They interpolate Picard Fuchs recurrences, and, in interesting cases, their Taylor series expansions are generating series for monodromy variations.

Thursday, November 15 (Lecture III), 4:00pm, Goldsmith 317
"Relative completions"
Abstract: (Joint with Brown and Vlasenko) The theory of relative completions (Hain) generalizes nilpotent completion. It is the right setting to study the iterated integrals arising in Lecture II.

Tuesday, November 20, 2018
No colloquium (Thanksgiving week)

Tuesday, November 27, 2018
John Wilmes, Brandeis University
Title and Abstract: TBA

Tuesday, December 4, 2018
Mark Van Raamsdonk, University of British Columbia
Title and Abstract: TBA

Tuesday, December 11, 2018
Gabriel Redner, Google
Title and Abstract: TBA

Spring 2019 Colloquia

Tuesday, January 15, 2019

Tuesday, January 22, 2019
No colloquium (Brandeis Monday)

Tuesday, January 29, 2019
Robin Wordsworth, Harvard University
Title and abstract: TBA

Tuesday, February 5, 2019

Tuesday, February 12, 2019
Gabriela González, Louisiana State University
Title and abstract: TBA

Tuesday, February 19, 2019
No colloquium (Midterm Recess)

Tuesday, February 26, 2019

Tuesday, March 5, 2019

Tuesday, March 12, 2019

Tuesday, March 19, 2019

Tuesday, March 26, 2019

Tuesday, April 2, 2019

Tuesday, April 9, 2019

Tuesday, April 16, 2019

Tuesday, April 23, 2019
No colloquium (Passover and Spring Recess)

Tuesday, April 30, 2019