Massless fermions in null Fermi coordinates and an application to analog gravity in ${\text{He}}^3$-A

Pritam Banerjee, Suvankar Paul, Tapobrata Sarkar

Bogoliubov quasiparticles moving in the background of superfluid ${\text{He}}^3$-A see an apparently curved space-time metric when the background superfluid vacuum is in motion. We s…