Theory Colloquia
Positivity Constraints for condensed matter and cosmology
by
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Europe/Zurich
4/3-006 - TH Conference Room (CERN)
Description
The coefficients of the operators of an effective field theory (EFT) are constrained to satisfy certain inequalities, under the (mild) assumption that the UV completion satisfies general requirements of causality and unitarity. I discuss the extension of these ideas to theories where the Lorentz symmetry is spontaneously broken, as it happens in cosmology and condensed matter physics. I explain why the use of the S-Matrix run into immediate problems. Constraints can be derived using dispersive arguments for the 2-point function of conserved currents. As a concrete application I will discuss general bounds on the electromagnetic properties of media.
TH colloquia
Zoom Meeting ID
67346292748
Host
Elena Gianolio
Alternative hosts
Zoom Recording Operations 2, Irene Valenzuela Agui, Benoit Loyer, Clement Montcharmont, Shota Komatsu, Pascal Pignereau, Pier Francesco Monni, John Cassar, AVC support account, Thomas Nik Bazl Fard
Passcode
80279029
Useful links
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Zoom URL