Axion condensation inside neutron stars

by Prof. Sanjay Reddy (INT/University of Washington)

Tuesday May 6, 2025, 2:00 PM → 3:00 PM Europe/Paris

100/0-MXX - Salle des Conseils (IJCLab)

The QCD axion, a fascinating hypothetical particle proposed about 50 years ago, might explain one of the universe’s lingering mysteries: why strong interactions don't seem to break CP symmetry. Perhaps more importantly, it remains one of the most exciting dark matter candidates. 

In my talk, I’ll delve into a compelling question: could axions condense inside neutron stars, due to the high baryon densities in their cores? Using Chiral Perturbation Theory and nuclear interaction models from Chiral Effective Field Theory, I'll demonstrate why this exotic phenomenon could indeed be possible.

If we can find evidence for—or against—axion condensation within neutron stars, it could probe vast regions of the axion parameter space. The implications for our understanding of both axions and neutron stars will be significant. 

 

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How to reach the seminar room:

Whereabouts of the laboratory on the Paris-Saclay campus

Bat. 100, general room map

Abstract.pdf