|Thursday 26 April 2018|
|Events for day: Wednesday 01 November 2017|
| 12:00 - 13:00 Quantum information biweekly journal club|
Autonomous Quantum Clocks: Does Thermodynamics Limit Our Ability to Measure Time? (Continuation)
Autonomous Quantum Clocks: Does Thermodynamics Limit Our Ability to Measure Time?
Time remains one of the least well-understood concepts in physics, most notably in quantum mechanics. A central goal is to find the fundamental limits of measuring time. One of the main obstacles is the fact that time is not an observable and thus has to be measured indirectly. Here, we explore these questions by introducing a model of time measurements that is complete and autonomous. Specifically, our autonomous quantum clock consists of a system out of thermal equilibrium-a prerequisite for any system to function as a clock-powered by minima ...
14:00 - 15:30 Weekly Seminar
Transition probabilities in stochastic single field inflation
We apply stochastic methods to single field inflationary models to study the boundary crossing probability for arbitrary potentials. This includes probability of falling from the top of a potential, or escaping from a local minimum. In a suitable regime, we use the method of steepest descent to obtain an approximate formula. We also discuss crossing several barriers in a chain process ...
14:00 - 15:00 Combinatorics and Computing Weekly Seminar
Computational complexity of polynomial time problems
14:00 - 17:00 Seminar
15:30 - 17:00 Geometry and Topology Weekly Seminar
Gauge theory and foliations
Homogeneous foliations are easily classified via techniques that have been available for more than 30 years. The classification links such foliations to flat connections with values in the Lie algebra of the symmetry group. Classification of general foliations is far more difficult and attracted efforts of many mathematicians. The purpose of this talk is to show how a similar approach may be used to study (concordance classes of) arbitrary foliations of codimension 1, as the gauge equivalence classes of flat connections with values in smooth functions on real numbers. The talk is based on joint work with Mehrzad Ajoodanian ...
15:30 - 16:30 Weekly Seminar
Simulation Techniques in Advanced Particle Accelerators
PARTICLES AND ACCELERATORS
Advanced accelerator research is aimed to increase the accelerating field gradient several orders of magnitude compared with the conventional accelerators, therefore reduce the size and cost of high-energy particle accelerates. New power sources such as high-intensity lasers and relativistic beams, and their interaction with plasmas provide tools for advanced accelerators. Computer simulation plays a crucial role in this field of research to understand the underlying physics, design new experiments and find optimum parameters relevant to the experiments. In this talk, I will present a brief introduction to numerical techniques in laser-driven ...