Description |
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. |
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