Events Archive

2013

Condensed Matter Seminar - Juerg Froehlich, ETH Zurich & IAS, Princeton - Gauge Theory and Topological Phases of Matter

Mon, Feb 25, 2013, 1:15 pm to 2:30 pm
We study a general class of systems of condensed matter including electron liquids and atom gases. Thanks to the U(1)- and SU(2)- gauge invariance of the quantum theory of such systems, one may study their response to coupling the electric current to a vector potential and the spin current to an SU(2)- gauge field.

Christina Marchetti (Syracuse U.) "Phase separation and jamming of dense active matter"

Mon, Feb 25, 2013, 12:00 pm to 1:00 pm
Recent experiments on confluent layers of epithelial cells and vibrated granular media have motivated interest in the behavior of active systems at high density, where the interplay of steric repulsion and activity can yield active glassy or jammed states. In this talk I will discuss the behavior of dense collections of self-propelled particles in...
Audience: Physics faculty, post docs, grads

High Energy Theory Seminar - Douglas Stanford, Stanford University - On memory in exponentially expanding spaces

Fri, Feb 22, 2013, 1:30 pm to 3:00 pm
I will present recent work, done in collaboration with Daniel Roberts, on the global memory of initial conditions that is sometimes, but not always, retained by fluctuating fields on de Sitter space, Euclidean anti de Sitter space, and trees.

Hamilton Colloquium Series - Roderich Moessner, Max Planck Institute for the Physics of Complex Systems, Dresden - "Magnetic Monopoles in Spin Ice"

Thu, Feb 21, 2013, 4:30 pm to 5:30 pm
Magnetic monopoles were first proposed to exist by Dirac many decades ago as the natural counterparts of electrically charged particles such as the electron. Despite much searching, no elementary monopoles have ever been observed, even though many theories of high-energy physics suggest that they should be present.

Math Physics Seminar - Frank Hansen, Tohoku University - Quantum Information Functionals

Tue, Feb 19, 2013, 4:30 pm to 6:00 pm
Quantum information functionals and their algebraic properties play an important role in quantum information theory. Recent developments in the theory of operator monotone and operator convex functions and related topics have simplified earlier results and also led to new insights. One example is the convexity of chi-square divergences.

High Energy Theory Seminar - Francesco Benini, Simon Center, Stony Brook - S^2 partition functions: Coulomb vs Higgs localization and vortices

Mon, Feb 18, 2013, 2:30 pm to 4:00 pm
In two-dimensional N=(2,2) R-symmetric theories of vector and chiral multiplets on the two-sphere, the partition function as well as expectation values of supersymmetric operators can be computed with localization techniques.

James Shapiro (U. Chicago) "The read-write genome"

Mon, Feb 18, 2013, 12:00 pm to 1:00 pm
The colloquium will discuss the ways that cells inscribe information onto and into their genomes at different time scales. These range from individual cell cycles to evolutionary time. The main emphasis will be on genomic inscriptions at the DNA level.
Audience: Physics faculty, post docs, grads

High Energy Theory Seminar - IAS - Daniel Harlow, Princeton University - “Quantum Computation vs. Firewalls”

Fri, Feb 15, 2013, 1:30 pm to 3:00 pm
Almheiri, Marolf, Polchinski, and Sully have claimed thatunitarity of black hole evaporation is inconsistent with the existenceof a smooth horizon.

Hamilton Colloquium Series - Duncan Haldane, Princeton University - "The Entanglement Spectrum: A new tool for studying quantum states of matter"

Thu, Feb 14, 2013, 4:30 pm to 5:30 pm
Until recently, the von Neumann entropy and its generalizations (Renyi) were the principal quantitative characterizations of entanglement. A richer characterization, first developed here at Princeton, is becoming the tool of choice for investigating topological (and conventional) order in quantum ground states of condensed matter systems.

Physics Group Meeting IAS - Nima Arkani-Hamed, IAS - “Locality and Unitarity from Positivity - Part 2”

CANCELLED Math Physics Seminar - Vojkan Jaksic, McGill University - Quantum Hypothesis Testing and Non-Equilibrium Statistical Mechanics

Tue, Feb 12, 2013, 4:30 pm to 6:00 pm
Since the days of Chernoff, the hypothesis testing has played an important role in theoretical and applied statistics.

High Energy Theory Seminar - Tim Cohen, SLAC Stanford - "Jet Substructure by Accident"

Mon, Feb 11, 2013, 2:30 pm to 4:00 pm
abstract: We propose a new search strategy for high-multiplicity hadronic final states. When new particles are produced at threshold, the distribution of their decay products is approximately isotropic. If there are many partons in the final state, it is likely that several will be clustered into the same large-radius jet.

Condensed Matter Seminar- Johnpierre Paglione, Univ of Maryland-Separation of magnetism and superconductivity in rare earth-doped CaFe2As2 by pressure

Mon, Feb 11, 2013, 1:15 pm to 2:30 pm
Traces of a high-Tc superconducting phase with transition temperatures approaching 50 K have been stabilized by the substitution of light rare earths for Ca atoms in the iron-pnictide material CaFe2As2 [*].

Doug Weibel (U. Wisconsin) "Regulation of bacterial biochemistry at strained bacterial membranes"

Mon, Feb 11, 2013, 12:00 pm to 1:00 pm
We are exploring an evolutionarily conserved mechanism for the localization and regulation of biochemistry at strained membranes in bacteria and mitochondria. In this talk, I highlight this mechanism by discussing the regulation of the universal and widely conserved DNA-repair protein, RecA.
Audience: Physics faculty, post docs, grads

High Energy Theory Seminar - Blaise Gouteraux - Nordic institute - Zero-temperature holographic phases with (un)broken U(1) symmetry

Fri, Feb 8, 2013, 1:30 pm to 2:30 pm
In this talk, we shall provide a classification of extremal scaling geometries in Einstein-Maxwell-Dilaton theories, allowing for the possibility of a broken U(1) symmetry, and examine whether they constitute acceptable ground for holographic superfluids. We distinguish between scale invariant geometries with a constant scalar and solutions with a...

Hamilton Colloquium Series- Clare Yu, Univ. of California - "A Condensed Matter Physicist Looks at Cancer, Tumor Location, and Tumor Microenvironment"

Thu, Feb 7, 2013, 4:30 pm to 5:30 pm

We will discuss what physics can bring to cancer biology, and the types of questions that physicists can ask such as "Why does a tumor grow where it does?" and "How does the microenvironment of a tumor affect its growth?" Cancer cells do not act alone.

High Energy Theory Informal Seminar - IAS - Michael Trott, CERN

High Energy Theory Seminar - IAS - Kevin Costello, Northwestern University - “Yangians and Supersymmetric Gauge Theory”

Mon, Feb 4, 2013, 2:30 pm to 4:00 pm
I'll describe a new link between supersymmetric gauge theories, with gauge group G, and the Yangian for the Lie algebra of G. The main result is that a certain twisted, deformed N=1 supersymmetric gauge theory, with gauge group G, is "controlled" by the Yangian built from G, in the same way that Chern-Simons theory is controlled by the quantum...

High Energy Physcis Seminar-Olga Driga-" Collider Investigations of Early Universe Physics"

Mon, Feb 4, 2013, 2:00 pm to 3:00 pm
ALICE (A Large Ion Collider Experiment) is a dedicated heavy ion experiment at Large Hadron Collider (LHC) at the European Center for Nuclear Research (CERN). The goal of the experiment is to study strongly interacting matter at extreme energy densities (QCD thermodynamics).

Biophysics Seminar Series - Ariel Amir (Harvard) "Bacterial growth: defects, elasticity and plasticity"

Mon, Feb 4, 2013, 12:00 pm to 1:00 pm
Bacterial cells have rigid walls, which define their shape, and enable them to hold high internal pressure. While much is known about cell wall chemistry, the mechanisms controlling its growth remain elusive. The processes leading to the cylindrical shape of many bacteria are only now being unraveled.
Audience: Physics faculty, post docs, grads

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