# Events Archive

## 2013

### High Energy Theory Seminar - IAS - Philip Schuster, Perimeter Institute - “(Why) Is Helicity Lorentz-Invariant?”

Mon, Apr 8, 2013, 2:30 pm to 3:30 pm

Massless particle states carry integer or half-integer spin about themomentum axis, or "helicity". Lorentz symmetry allows for helicity states to mix under boosts (like massive particle polarizations); such mixing is not understood theoretically and is not obviously well constrained by experiment.

### Condensed Matter Seminar - Philip Kim, Columbia University - Bloch, Landau, and Dirac: Hofstadter’s Butterfly in Graphene

Mon, Apr 8, 2013, 1:15 pm to 2:30 pm

Electrons moving in a periodic electric potential form Bloch energy bands where the mass of electrons are effectively changed. In a strong magnetic field, the cyclotron orbits of free electrons are quantized and Landau levels forms with a massive degeneracy within.

### Naama Brenner (Technion) "Universal protein distributions in cell populations"

Mon, Apr 8, 2013, 12:00 pm to 1:00 pm

The protein content of a cell is a primary determinant of its phenotype. Yet, large fluctuations in protein numbers are observed among genetically identical cells grown under identical conditions. Recently, cellular protein variability has been a hot topic of research, with microorganisms providing a popular model system.

Audience:
Faculty, post docs, grads

### High Energy Theory Seminar - Ofer Aharony, Weizmann Institute - "From 4d dualities to 3d dualities"

Fri, Apr 5, 2013, 1:30 pm to 3:00 pm

It was found in the 1990s that many pairs of supersymmetric gauge theories with four supercharges, both in four and in three space-time dimensions, have the same low-energy dynamics. I will describe how to

### Hamilton Colloquium Series - Amir Yacoby, Harvard University - “Quantum Information Processing and Metrology Using Few Electron Spins in Solids”

Thu, Apr 4, 2013, 4:30 pm to 5:30 pm

Quantum computing and information processing use quantum two level systems as their building blocks. Solid-state implementations of quantum bits use, for example, single or few electron spins confined to small spatial dimensions.

### Mathematical Physics Seminar - Ron Peled, Tel Aviv University - Surface depinning under the two-dimensional hammock potential

Tue, Apr 2, 2013, 4:30 pm to 6:00 pm

We consider a random two-dimensional surface satisfying a Lipschitz constraint. The surface is uniformly chosen from the set of all real-valued Lipschitz functions on a two-dimensional discrete torus. Our main result is that the surface delocalizes, having fluctuations whose variance is at least logarithmic in the size of the torus.

### High Energy Theory Seminar - Akikazu Hashimoto, University Wisconsin, Madison - "Gravity dual of dynamically broken supersymmetry."

Mon, Apr 1, 2013, 2:30 pm to 4:00 pm

### Paul Chaikin (NYU) "Artificial self-replicating stuff"

Mon, Apr 1, 2013, 12:00 pm to 1:00 pm

Lunch @ 11:45, talk @ 12-1:00

Audience:
Physics faculty, post docs, grads

### Hamilton Colloquium Series - Alain Aspect, Institut d'Optique, Palaiseau - "From Einstein's intuition to quantum bits: a new quantum age?"

Thu, Mar 28, 2013, 4:30 pm to 5:30 pm

In 1935, with co-authors Podolsky and Rosen, Einstein discovered a weird quantum situation, where particles in a pair are so strongly correlated that Schrödinger called them “entangled.” By analyzing that situation, Einstein concluded that the quantum formalism was incomplete.

### High Energy Physics Seminar- Michelle Dolinski-Drexel University- "Neutrinoless Double Beta Decay with EXO and Beyond."

Thu, Mar 28, 2013, 3:00 pm to 4:00 pm

Neutrino masses provide a direct window into Physics Beyond the Standard Model. It is an open question whether massive neutrinos are Majorana fermions or Dirac fermions. Majorana neutrinos, which violate lepton number conservation, offer an intriguing mechanism for generating small neutrino masses.

### High Energy Theory Discussion Seminar - IAS - Graham Kribs, University of Oregon & IAS - Particle Physics post-Moriond: A Discussion

Thu, Mar 28, 2013, 10:00 am to 11:00 am

### From molecules to development: revealing simple rules of biological clocks - Qiong Yang, Stanford University

Tue, Mar 26, 2013, 1:30 pm to 6:00 pm

Organisms from cyanobacteria through vertebrates make use of biochemical and genetic oscillators to drive repetitive processes like cell cycle progression and vertebrate somitogenesis. Oscillators also allow organisms to anticipate natural environmental rhythms, as exemplified by the circadian clock.

### High Energy Theory Informal Seminar - IAS - Tomasz Taylor, Northeastern U. - Superstring Amplitudes as a Mellin Transform of Supergravity

Tue, Mar 26, 2013, 1:30 pm to 2:30 pm

At the tree level, the maximally helicity violating amplitudes of N gauge bosons in open superstring theoryand of N gravitons in supergravity are known to have simple representations in terms of tree graphs.For superstrings, the graphs encode integral representations of certain generalized hypergeometric functions of kinematic invariants while for...

### High Energy Theory Seminar - Costis Papayeorgakis, Rutgers University - "On the (2,0) theory and 5D SYM"

Mon, Mar 25, 2013, 2:30 pm to 3:30 pm

"We will review the connection between the six-dimensional (2,0) theory and maximally supersymmetric Yang-Mills in five dimensions (MSYM). We will discuss the implications of a conjectured relation between the two, at all energy scales, for MSYM.

### Condensed Matter Seminar - Andrew Sachrajda, The National Research Council - Coherent Behaviour in a Triple Quantum Dot Circuit

Mon, Mar 25, 2013, 1:15 pm to 2:30 pm

In this talk I will describe our experimental investigations of an AlGaAs/GaAs based triple quantum dot circuit and their comparison with theoretical models. We are able to employ both quantum transport and charge detection down to single electron/spin occupation and employ many of the pulsing techniques developed previously for two dot circuits.

### Harnessing the Atom-like Properties of Single Spins in Diamond - Lee C. Bassett, Center for Spintronics and Quantum Computation, University of Califor

Mon, Mar 25, 2013, 12:15 pm to 1:15 pm

The past decade has seen remarkable progress in the isolation and control of single spins in solid state devices. With electron spin coherence times in some materials now measured in seconds, single spins provide many features formerly unique to atomic systems in a form amenable to engineering complex integrated devices through semiconductor...

### Biophysics Seminar - Roman Stocker (MIT) "Spying on the lives of marine microbes: From biophysics to ecology "

Mon, Mar 25, 2013, 12:00 pm to 1:00 pm

At a time when microbial ecology is largely traveling along genomic roads, we cannot forget that the functions and services of microbes depend greatly on their behaviors, encounters, and interactions with their environment.

Audience:
Physics faculty, post docs, grads

### High Energy Theory Seminar - IAS - Thomas Dumitrescu, Princeton University - TBA

Fri, Mar 22, 2013, 1:30 pm to 3:00 pm

### HET Seminar - IAS - Yuji Tachikawa, Kavli Institute for the Physcs & Mathematics of the Universe - “Yet Another Dual Description for N=1 SQCD”

Fri, Mar 15, 2013, 1:30 pm to 3:00 pm

Description: N=1 supersymmetric SU(2) gauge theory with 4 flavors has not only the usual Seiberg dual description, but also the Intriligator-Pouliot dual as an Sp(1) gauge theory, and yet another one found by Csaki, Schmaltz, Skiba and Terning (CSST).

### Special Condensed Matter Seminar - Ville Lahtinen - Condensate-induced transitions and critical spin chains

Fri, Mar 15, 2013, 1:15 pm to 2:30 pm

We show that the framework of condensate-induced transitions between two-dimensional topological phases can be used to relate one-dimensional spin models at their critical points.