Tuesday 23 January 2018 |

Events for day: Wednesday 01 November 2017 |

12:00 - 13:00 Quantum information biweekly journal clubAutonomous Quantum Clocks: Does Thermodynamics Limit Our Ability to Measure Time? (Continuation)School NANO SCIENCES 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 SeminarTransition probabilities in stochastic single field inflation School ASTRONOMY 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 SeminarComputational complexity of polynomial time problems School MATHEMATICS . ... 14:00 - 17:00 SeminarAF-embeddability (II). School MATHEMATICS . ... 15:30 - 17:00 Geometry and Topology Weekly SeminarGauge theory and foliations School MATHEMATICS 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 SeminarSimulation Techniques in Advanced Particle Accelerators School 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 ... |