QCD-Collapsed Domain Walls

Abstract

For a discrete symmetry that is anomalous under QCD, the domain walls produced in the early universe from its spontaneous breaking can naturally annihilate due to QCD instanton effects. We point out that the QCD phase transition within some domains with an effective large QCD theta angle could be a first-order one. This class of domain-wall models predicts an interesting gravitational wave spectroscopy with frequencies spanning more than ten orders of magnitude, from nanohertz to 100 Hz.

About the Speaker

Prof. BAI Yang is a Professor in the Department of Physics at the University of Wisconsin-Madison. He obtained his BS from the USTC in 2002 and his PhD. from Yale University in 2007. He conducted postdoctoral studies at Fermilab from 2007 to 2010 and at SLAC from 2010 to 2012 before joining the University of Wisconsin-Madison. Prof. Bai's research interests lie in theoretical particle physics, specifically focusing on areas such as dark matter, collider physics, black hole, and the early universe physics.

About the Program

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