| Thursday 25 April 2024 | |
| Events for day: Wednesday 19 April 2017 |
| 11:00 - 12:00 Computational nanoscience biweekly journal club Solving the quantum many-body problem with artificial neural networks School NANO SCIENCES Solving the quantum many-body problem with artificial neural networks The challenge posed by the many-body problem in quantum physics originates from the difficulty of describing the nontrivial correlations encoded in the exponential complexity of the many-body wave function. Here we demonstrate that systematic machine learning of the wave function can reduce this complexity to a tractable computational form for some notable cases of physical interest. We introduce a variational representation of quantum states based on artificial neural networks with a variable number of hidden neurons. A reinforcement-learning scheme we de ... 13:30 - 15:00 Weekly Seminar Minimum length scale and Quantum Gravity phenomenology School ASTRONOMY The existence of minimum length scale, below which no other length can be observed, is the common feature of quantum gravity candidates such as loop quantum gravity and string theories. In this talk, after a brief review of the history of minimum length scale, we introduce some phenomenological approaches to the issue including Generalized Uncertainty Principle, Noncommutative Spacetime, Doubly Special Relativity theories, and recently proposed Gravity's Rainbow formalism. We also discuss how taking a minimum length scale into account can solve the Big Bang singularity problem in the standard model of cosmology. ... 14:00 - 15:00 Weekly Seminar Condensed Matter and Statistical Physics Group Self-phoretic motors (Janus particles) School PHYSICS Farmanieh Seminar Room ... 14:00 - 15:00 Weekly Seminar Self-phoretic motors (Janus particles) School NANO SCIENCES Self-phoretic motors (Janus particles) Fabrication and developing small scale motors which can propel itself without external energy source is one of the challenges facing many filed of science including physics. They are of interest for a number of reasons, including potential to transport tasks in drug delivery. Recently, self-phoretic motors have attracted many interests. These motors are able to move in a fluid by means of promoting surface chemical reactions. These reactions take place asymmetrically on the surface of motors, e.g. parts of the surface release some molecules (orions), some parts consume them, and some pa ... 15:00 - 16:00 Weekly Seminar Standardized Cumulants of Flow Harmonic Fluctuations School PARTICLES AND ACCELERATORS The outcome of a single event in a typical heavy ion collision includes around ten thousand of particles. The exact value of the number of particles depends on the center of mass energy and the impact parameter of the ions collision. One of the main observables in this experiment is the flow harmonic, v_n, the Fourier harmonic of the particle momentum azimuthal distribution. Even if we extract this distribution from events with almost the same impact parameter and center of mass energy, we find different v_n's due to the event by event fluctuations. We review the fluctuations of initial condition in the heavy ion collisions and its manifest ... 16:30 - 18:00 Physics Colloquium Influence of external white noise on the formation of non-Maxwellian velocity distribution function: A molecular dynamics study. School PHYSICS Farmanieh, Lecture room C ... |