Information about upcoming Colloquia

Title: Chiral anomalous processes in magnetospheres of compact stars

Date: September 29, 2021 (Wednesday)

Time: 9:00 am MST (16:00 UTC)

Speaker: Prof. Eduard Gorbar,

Affiliation: Taras Shevchenko National University of Kyiv, Ukraine

Abstract

The implications of the chiral anomaly for relativistic plasmas in magnetospheres of compact stars are discussed. The quantitative effects are characterized by a chiral chemical potential. It is induced by parallel electric and magnetic fields present in the gap regions of magnetospheres. In magnetars, the chiral chemical potential can become large enough to have observable implications, including the emission of circularly polarized electromagnetic radiation.

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Title: Neutrinos and gravity: multi-messenger scenarios

Date: October 6, 2021 (Wednesday)

Time: 9:00 am MST (16:00 UTC)

Speaker: Prof. Cecilia Lunardini,

Affiliation: Arizona State University

Abstract

Neutrinos are important players in the emerging field of multi-messenger astronomy. Their synergy with gravitational waves is only starting to be explored. In this colloquium, I highlight examples of neutrino-gravitational waves interplay, and what can be learned from their future observations. Specifically, I will cover neutrinos and gravitational waves from core collapse supernovae, including the memory effect, which is directly caused by neutrino emission. I will also review recent advances on low and high energy neutrinos from astrophysical phenomena involving black holes, like binary mergers and tidal disruption events.

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Title: Plasma screening and the critical end point in the QCD phase diagram

Date: October 13, 2021 (Wednesday)

Time: 9:00 am MST (16:00 UTC)

Speaker: Prof. Alejandro Ayala,

Affiliation: Universidad Nacional Autonoma de Mexico, Mexico

Abstract

I show that in a strongly interacting plasma, the fluctuations responsible for deviations from those of a description based on a simple Hadron Resonance Gas Model come from considering the plasma screening properties. These are encoded in the contribution of the so called "ring diagrams" and thus in the introduction of a key feature of plasmas near phase transitions, namely, long-range correlations. I illustrate this property using the Linear Sigma Model with quarks which in the high temperature approximation renders analytical results. After fixing the model parameters using input from LQCD for the crossover transition at vanishing baryon chemical potential, I study the location of the Critical End Point (CEP) in the effective QCD phase diagram. I use the model to study baryon number fluctuations and show that in heavy-ion collisions, the CEP can be located for collision energies of order of 2 GeV per nucleon, namely, in the lowest NICA or within the HADES energy domain.

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