Non-local divergences in open QFTs (Quantum Spacetime Seminar Series)

by Dr Chandan Jana (ICTS-TIFR, Bengaluru)

Monday 30 Sept 2019, 11:30 → 12:30 Asia/Kolkata

A304

We study renormalisation of open QFTs. Unlike the unitary field theories, open field theories have non-local divergences in one loop correction to the coupling constants. We do not have a good understanding of these divergences. A microscopic derivation of the open effective theory could resolve their appearance. But integrating out the bath degrees of freedom is technically difficult for a field. The recently proposed holographic Schwinger-Keldysh prescription has opened up a new direction; we can derive the open action for fields.

In this seminar I shall discuss about the renormalisation of open φ⁴ theory and discuss about non-local divergences. I shall also talk about the recent progress on the holographic derivation of open φ⁴ theory.

Poster 30-09-2019_Chandan_Jana-1.pdf