#### Room 327

#### BRST v/s EPR in Maxwell - continued

#### Ronak M Soni

##### TIFR, Mumbai

*It has been known for a while that entanglement shouldn't be*

calculated after gauge-fixing, because gauge-fixing 'rearranges' degrees of

freedom in space. However, it is an open question whether accounting for

the entanglement of the BRST ghosts cancels this gauge-dependence. More

precisely, the question is: do two different states in the same

BRST-cohomology necessarily have the same entanglement?

A piece of evidence that the answer is yes is that the replica trick path

integral is gauge-invariant. We show, however, that the answer is no, and

further that this is completely compatible with the gauge-invariance of the

replica trick path integral.

Finally, I discuss whether we can bound the gauge-dependence in some way.

Done