| Thursday 18 April 2024 | |
| Events for day: Wednesday 10 April 2019 |
| 10:00 - 12:00 Lecture Open Knowledge of One's Inexact Knowledge School PHILOSOPHY Open Knowledge of One's Inexact Knowledge ... 11:00 - 13:00 Theoretical Neuroscience Journal Club Hierarchical decision processes that operate over distinct timescales underlie choice and changes in strategy School COGNITIVE SCIENCES Venue: School of Cognitive Sciences, Institute for Research in Fundamental Sciences (IPM), Opposite the ARAJ, Artesh Highway, Tehran, Iran >> schedule >> Poster of this session ... 13:30 - 15:00 Weekly Seminar Early time cosmology after swampland conjecture School ASTRONOMY Big bang cosmology problems, as well as large scale structures (LSS) formation and the existence of cosmic microwave background (CMB) temperature fluctuation, can be explained in the context of inflationary cosmology. At the end of the inflation era, during a reheating epoch, the universe is heating up. Swampland conjecture is in contrast with effective thermal field theory of reheating epoch. The effective potential of the scalar field, which is firstly responsible for the accelerated expansion of the universe, at the reheating epoch with temperature $T 14:00 - 16:00 Seminar Causality School COGNITIVE SCIENCES Abstract: The first section of talk starts with an introduction to causality. We introduce the principle of invariant mechanisms as a key assumption in causal structure learning. We describe the semantics of Structural Causal Models (SCM) and define the concepts of d-separation, Markov conditions, and faithfulness assumption in causal graphical models. In the second part of the talk, two main approaches in causal structure learning are presented: causal learning based on conditional independence tests and learning in additive noise models. Finally, we talk about some recent applications of causal learning in brain research. 14:00 - 15:00 Weekly Seminar Combinatorics and Computing School MATHEMATICS Bootstrap percolation in the Hamming torus ... 14:00 - 15:00 Weekly Seminar Massive spinons in S=1/2 spin chains: Spinon-pair operator representation School NANO SCIENCES Massive spinons in S=1/2 spin chains: Spinon-pair operator representation Abstract: Spinons are among the generic excitations in one-dimensional spin systems; they can be massless or massive. The quantitative description of massive spinons poses a considerable challenge in spite of various variational approaches. We show that a representation in terms of hopping and Bogoliubov spinon processes, which we call "spinon-pair" operators, and their combination is possible. We refer to such a representation as second quantized form. Neglecting terms which change the number of spinons yields the variational results. Treati ... 15:00 - 16:00 Weekly Seminar Instability of BTZ black holes in parity-even massive gravity School PARTICLES AND ACCELERATORS Abstract: We investigate the linearized equations of motion in three-dimensional Born-Infeld gravity theory. Motivated by this model, we calculate the quasinormal modes of BTZ black hole solutions of parity-even gravity theories in three dimensions by using numerical methods. The results are classified in three families and they are so accurate such that it allows us to propose analytical form for the quasinormal frequencies. We find new quasinormal modes which have been missing in the literature of the analytical studies of three-dimensional massive gravitons. These new modes do not have the known tower structure and they are purely imaginar ... 15:30 - 16:30 Geometry and Topology Weekly Seminar On Generalizations of the Gromov-Hausdorff Metric School MATHEMATICS Gromov has defined a metric on the set of all compact metric spaces. This metric is defined for group-theoretic purposes but has found important applications in probability theory as well. Also, there exist several generalizations of this metric. For instance, the Gromov-Hausdorff-Prokhorov metric defines the distance of two measured metric spaces. Other examples consider metric spaces equipped with a distinguished point, a closed subset, a curve, a tuple of such structures, etc. In this talk, a general approach is presented for generalizing the Gromov-Hausdorff metric to consider metric spaces equipped with some additional structure. This a ... |