|Wednesday 4 October 2023|
|Events for day: Wednesday 10 May 2023|
| 11:30 - 12:30 Wednesday Weekly Seminar - meeting |
Heavy ion fusion reactions: a brief review of recent advances
PARTICLES AND ACCELERATORS
Nuclear fusion in heavy-ion collisions is a dynamical process of quantum many-body systems. Heavy ion fusion studies have attracted researchers not only for the cause of energy production in the stellar region but also for the formation of new exotic nuclear isotopes. Great progress in synthesizing new heavy and superheavy nuclei by these types of nuclear interactions has been achieved in recent years. They can also provide useful information regarding the nuclear structure and interaction potential of the colliding nuclei. Theoretically, the simplest approach for heavy-ion fusion reactions is to use the one-dimension ...
13:30 - 15:00 Weekly Seminar
Loop corrections in Power Spectrum in Single Field Inflation
We revisit the one-loop correction in curvature perturbation power spectrum in models of single field inflation which undergo a phase of ultra slow-roll (USR)
inflation. It is shown that the amplitude of one-loop corrections depends on the sharpness of the transition from the USR phase to the final slow-roll phase. For an arbitrarily sharp transition, the one-loop correction becomes arbitrarily large, invalidating the perturbative treatment of the analysis. However, we show that for a mild transition the one-loop corrections are washed out during the subsequent evolution after the USR phase. The loop corrections for tensor perturbati ...
14:00 - 15:00 Combinatorics and Computing Weekly Seminar
Some Open (and solvable) Problems in the Game of Cops and Robbers
Cops and Robbers is a two-player game on graphs, one of the players controls the robber while the other one controls all the cops. First, the cops will choose their initial positions and then the robber, knowing the location of each cop, decides his the starting vertex. Then in each step, first the cops and then the robber move. Obviously, the goal of cops is to catch the robber and the goal of the robber is to prevent this from happening. In the last couple of years, this game has received lots of attentions in the field of graph theory and several versions of the game has been introduced. Different versions of this game work with different ...
17:30 - 19:00 Algebraic Geometry Biweekly Webinar
Polynomial Invariants for Triangulated Categories with Full Exceptional Sequences
For a full exceptional sequence of vector bundles on the projective plane there is a remarkable equation, the so-called Markov equation, in terms of the ranks of the three vector bundles. This equation, slightly modified, has been used in a joint work with Beineke and Brustle for cluster mutations for quivers with three vertices. The aim of this talk is to define the natural generalization for full exceptional sequences with n members. This leads to the notion of a polynomial invariant, that is a polynomial in indeterminants x(i,j) for i < j between 1 and n. This allows to evaluate such a polynomial at any full exceptional sequence. We define ...
18:00 - 19:00 Physics Colloquium
Uncovering hidden neuronal microcircuits using Boltzmann like correlations, a unified framework
The information transfer and processing in our brain relies on cells called neurons. They are connected to each other through connections called synapse, and form an interconnected complex network, known as gray matter. Each neuron receives signals from its upstream neurons, generates a spike, and passes it to many downstream neurons. To understand this complex structure, one should have learnt the connectivity map of neurons, in a living brain. However, it is practically impossible to record from one neuron and all its hidden inputs to determine the influential synapses which dominate the activity of that neuron. Although there are methods t ...