# Instanton/Sphaleron processes in hadronic, heavy ion collisions and cosmology

• Edward Shuryak (Stony Brook University)
• Friday 07 May 2021, 16:00-17:00
• Virtual Seminar .

The seminar will take place via Zoom here.

Abstract: I start describing the (pure gauge) topological landscape as a function of Chern-Simons number and size. It was originally derived by reduction from 4d Instanton-Antiinstanton valley, as well as direct energy minimization with constraints. The instanton-sphaleron processes combines an “inclined tunneling” and Minkowskian solution, describing a sphaleron explosion. It has been proposed to observe the QCD sphaleron production in pp collisions at LHC and RHIC , via double diffractive events . At small masses $M\sim 3\, GeV$ the key observable is proposed to be $\bar u u \bar d d \bar s s$ flavor content, at $M> 20\, Gev$ multi-jet clusters. We then briefly discuss sounds in heavy ion collisions and the Big Bang, and ongoing search for sphaleron production via chiral imbalance and chiral magnetic effect. At the end we consider electroweak and QCD cosmological phase transitions, focusing on possible role of sphalerons in production of sounds, gravity waves and magnetic fields.

The slides are available here

This talk is part of the HEP phenomenology joint Cavendish-DAMTP seminar series.