High Energy Theory Seminar- Shira Chapman, Tel Aviv University - "Lifshitz Field Theories, Anomalies and Hydrodynamics"
Oct 23, 2014 · 3:00 p.m.– 4:00 p.m. · Jadwin 111
I will review various aspects of field theories that obey a Lifshitz scaling symmetry. I will detail our study of the cohomological structure of anisotropic Weyl anomalies (the equivalent of trace anomalies in relativistic scale invariant field theories). I will also analyze the hydrodynamics of Lifshitz field theories and in particular of Lifshitz superfluids which may give insights into the physics of high temperature superconductors.
Oct 23, 2014 · 8:00 p.m.– 9:00 p.m. · Jadwin A10
Abstract: Why are atoms stable? What caused galaxies, stars and planets to form? I will explain why quantum physics is crucial for explaining both. Finally, I will discuss the experimental evidence that assures us that everything in our universe originated from quantum fluctuations.
This Public Lecture supported by The William A. Kuncik '75 and Cheryl A. LaFleur '75 Endowment for Princeton Center for Theoretical Science
Oct 24, 2014 · 12:15 p.m.– 2:15 p.m. · PCTS Seminar Room
Gravity Group Lunch Seminar joint with String Cosmology and Inflation workshop
Speaker: Neil Turok — TBA
1:15—2.15 p.m. PCTS Seminar Room
Note: Lunch starts at 12.15pm.
Sign-up for lunch and talk is required by Oct 20, 4pm
Oct 27, 2014 · 1:15 p.m.– 2:30 p.m. · PCTS Seminar Room
High Energy Theory Seminar- IAS - Andrew Strominger, Harvard University, “Semiclassical Virasoro Symmetry of the Quantum Gravity S-Matrix”
Oct 27, 2014 · 2:30 p.m.– 3:30 p.m. · Bloomberg Lecture Hall - Institute for Advanced Study
High Energy Theory Seminar- IAS - Steve Adler, IAS - “SU(8) Family Unification with Boson-fermion Balance”
Oct 31, 2014 · 1:45 p.m.– 3:00 p.m. · Bloomberg Lecture Hall - Institute for Advanced Study
High Energy Theory Seminar- Emanuel Katz, Boston U. - "Effective conformal dominance and a new approach to solving a field theory"
Nov 3, 2014 · 2:30 p.m.– 3:30 p.m. · PCTS Seminar Room
I will consider the case of a CFT deformed by a relevant perturbation resulting in a mass gap. I will argue that in such a case, operators of high scaling-dimension can decouple exponentially quickly from low-energy bound states. This observation motivates a new way of solving strongly coupled theories using a conformal basis on the light-cone. In particular, I will describe the method applied to 2D QCD-like theories both at large and at small N. I will also describe progress in formulating the approach in 3D.
Hamilton Colloquium Series - Slava Rychkov, CERN, and ENS-Paris, “Non-Hamiltonian approach to conformal quantum field theory – 40 years later”
Nov 6, 2014 · 4:30 p.m.– 6:00 p.m. · Jadwin A10
Most takes on quantum field theory start from microscopics, fundamental degrees of freedom, a Lagrangian. Conformal field theory is an exception—it focuses on the algebra of local operators and avoids any reference to the Lagrangian. This leads to a method for doing practical CFT calculations—the conformal bootstrap. The method is 40 years old, though it seemed limited to D=1+1 dimensions where the conformal group is infinite. Recent work shows how to set it up for any D. Applications are rapidly expanding, and the method will become a standard QFT tool next to the RG, the epsilon-expansion, and the 1/N expansion. We will highlight the world-record determination of the 3D Ising critical exponents obtained by the conformal bootstrap.
Nov 7, 2014 · 4:00 p.m.– 5:00 p.m. · 87 Prospect
Condensed Matter Seminar, John Martinis, UCSB, "Superconducting qubits poised for fault-tolerant quantum computation"
Nov 10, 2014 · 1:15 p.m.– 2:30 p.m. · PCTS Seminar Room
Superconducting quantum computing is now at an important crossroad, where “proof of concept” experiments involving small numbers of qubits can be transitioned to more challenging and systematic approaches that could actually lead to building a quantum computer. Our optimism is based on two recent developments: a new hardware architecture for error detection based on “surface codes”, and recent improvements in the coherence of superconducting qubits. I will explain how the surface code is a major advance for quantum computing, as it allows one to use qubits with realistic fidelities, and has a connection architecture that is compatible with integrated circuit technology. We have also recently demonstrated a universal set of logic gates in a superconducting Xmon qubit that achieves single-qubit gate fidelity of 99.92% and a two-qubit gate fidelity up to 99.4%. This places Josephson quantum computing at the fault-tolerant threshold for surface code error correction. Our quantum processor is a first step towards the surface code, using five qubits arranged in a linear array with nearest-neighbor coupling. Using this device we have further demonstrated generation of the five-qubit Greenberger-Horne-Zeilinger (GHZ) state using the complete circuit and full set of gates, giving a state fidelity of 82% and a Bell state (2 qubit) fidelity of 99.5%. These results demonstrate that Josephson quantum computing is a high-fidelity technology, with a clear path to scaling up to large-scale, fault-tolerant quantum circuits.
Nov 10, 2014 · 2:30 p.m.– 4:00 p.m. · PCTS Seminar Room
Math Physics Seminar, Christian Fronsdal, UCLA, "The Structure of flow in Hyrdrodynam:wqics, Thermodynamics and General Relativity, from Navier Stokes
Nov 11, 2014 · 4:30 p.m.– 5:30 p.m. · Jadwin 343
"The structure of flow in Hydrodynam:wqics, Thermodynamics and General Relativity, from Navier Stokes to Tolman."
Problems with the formulation of Relativistic Astrophysics lead to the need for a variational formulation of thermodynamics. This is easy and immensely rewarding in the non relativistic context, so long as the motion is irrotational. The main topic of this talk is to overcome this limitation. The solution is amazingly simple; one has to combine two familiar forms of hydrodynamics. but it is shocking and even revolutionary nevertheless. Some basic tenets have to be given up, with interesting consequences. The application to General Relativity will be sketched at the end.
Nov 13, 2014 · 4:30 p.m.– 6:00 p.m. · Jadwin A10
Nov 14, 2014 · 4:00 p.m.– 5:00 p.m. · Jadwin 111
Nov 17, 2014 · 1:15 p.m.– 2:30 p.m. · PCTS Seminar Room
Nov 17, 2014 · 2:30 p.m.– 3:30 p.m. · PCTS Seminar Room
Nov 18, 2014 · 2:00 p.m.– 3:00 p.m. · PCTS Seminar Room
Math Physics Seminar, Jakob Yngvason, U. of Vienna, "Superfluid behavior of a Bose-Einstein condensate in a random potential"
Nov 18, 2014 · 4:30 p.m.– 5:30 p.m. · Jadwin 343
We investigate the relation between Bose-Einstein condensation
(BEC) and superfluidity in the ground state of a one-dimensional model of interacting Bosons in a strong random potential. We prove rigorously that in a certain parameter regime the superfluid fraction can be arbitrarily small while complete BEC prevails. In another regime there is both complete BEC and complete superfluidity, despite the strong disorder. This is joint work with M. Könenberg, T. Moser and R. Seiringer.
Hamilton Colloquium Series - Hardy Gross, Max Planck Institute of Microstructure Physics, Germany, "Title: TBA"
Nov 20, 2014 · 4:30 p.m.– 6:00 p.m. · Jadwin A10
Nov 21, 2014 · 1:45 p.m.– 2:30 p.m. · Jadwin A08
Particle Physics Seminar, Yoni Kahn, MIT, "Halo-independent methods for emerging dark matter signals"
Nov 21, 2014 · 4:00 p.m.– 5:00 p.m. · Jadwin 111
The increasingly constraining null results of the LUX, XENON, and CDMS direct-detection experiments suggest that any future dark matter signal will begin with a trickle of events, rather than a flood. I will describe methods for analyzing direct-detection experiments which are independent of the velocity distribution of the dark matter halo, and which are particularly well-suited to sparsely distributed events at experiments with excellent energy resolution.
Condensed Matter Seminar, Chen Chin, U of Chicago,“Ferromagnetic domains and roton excitations in a dilute Bose superfluid”
Nov 24, 2014 · 1:15 p.m.– 2:30 p.m. · PCTS Seminar Room
We present a new scheme to engineer the energy-momentum dispersion of atoms in optical lattices. By hybridizing bands, we identify a novel quantum phase transition from the emergence of superfluid domains with ferromagnetic interactions. Bragg spectroscopy within one domain reveals the appearance of roton excitations, which strongly suppress superfluidity near the quantum critical point.
Nov 24, 2014 · 2:30 p.m.– 3:30 p.m. · Bloomberg Lecture Hall - Institute for Advanced Study
Dec 1, 2014 · 2:30 p.m.– 3:30 p.m. · PCTS Seminar Room
Dec 2, 2014 · 2:30 p.m.– 3:30 p.m. · PCTS Seminar Room
Hamilton Colloquium Series - Yifang Wang, Institute of High Energy Physics (Beijing): "Daya Bay neutrino experiment and the future"
Dec 4, 2014 · 4:30 p.m.– 6:00 p.m. · Jadwin A10
Recently reactor neutrino experiments have made important contributions to the neutrino oscillation. I will introduce the Daya Bay experiment which observed for the first time the neutrino mixing angle θ13 with a statistical significance of 5.2 σ. The concept of the experiment, the detector construction and data analysis will be described. The next generation reactor neutrino experiment, JUNO, is about to start the construction in China. This experiment can determine the neutrino mass hierarchy and improve the precision of neutrino mixing parameters by one order of magnitude. It is also sensitive to supernova neutrinos, geoneutrinos and many others. I will also describe a new idea of neutrino beam for CP phase determination.
Dec 8, 2014 · 1:15 p.m.– 2:30 p.m. · PCTS Seminar Room
Dec 8, 2014 · 2:30 p.m.– 3:30 p.m. · Bloomberg Lecture Hall - Institute for Advanced Study
Dec 12, 2014 · 1:45 p.m.– 2:30 p.m. · PCTS Seminar Room
Dec 12, 2014 · 4:00 p.m.– 5:00 p.m. · Jadwin 111
Jan 28, 2015 · 2:00 p.m.– 3:00 p.m. · PCTS Seminar Room
Jan 28, 2015 · 2:00 p.m.– 3:30 p.m. · PCTS Seminar Room
Feb 9, 2015 · 1:15 p.m.– 2:30 p.m. · PCTS Seminar Room
Feb 23, 2015 · 1:15 p.m.– 2:30 p.m. · PCTS Seminar Room
Apr 6, 2015 · 1:05 p.m.– 2:30 p.m. · PCTS Seminar Room
Apr 20, 2015 · 1:15 p.m.– 2:30 p.m. · PCTS Seminar Room