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VERSION:2.0
PRODID:www.imperial.ac.uk
BEGIN:VEVENT
UID:63df030c654c4
DTSTART:20221129T131500Z
SEQUENCE:0
TRANSP:OPAQUE
DTEND:20221129T150000Z
URL:https://www.imperial.ac.uk/events/155693/theory-group-seminar-oliver-ja
nssen/
LOCATION:H503\, Huxley Building\, South Kensington Campus\, Imperial Colleg
e London\, London\, SW7 2AZ\, United Kingdom
SUMMARY:Theory group seminar: Oliver Janssen – Positivity in EFTs with sp
ontaneously broken boosts
CLASS:PUBLIC
DESCRIPTION:Positivity in EFTs with spontaneously broken boosts\nI will dis
cuss positivity bounds on EFT coefficients in theories where Lorentz boost
s are spontaneously broken. The well-known S-matrix argument from the Lore
ntz-invariant scenario does not straightforwardly generalize to this case.
Instead the analytic properties of the retarded Green’s function of con
served currents (or of the stress-energy tensor) will be used\, and the th
eory will be assumed to become conformal in the UV. The method is general
and applicable to both cosmology and condensed matter systems. As a concre
te example we will consider the EFT of conformal superfluids\, which descr
ibes the universal low-energy dynamics of CFTs at large U(1) charge\, and
we will derive inequalities on the coefficients of the operators\, in thre
e spacetime dimensions\, at NLO and NNLO.
X-ALT-DESC;FMTTYPE=text/html:**Positivity in EFTs with spontaneously br
oken boosts**

\nI will discuss positivity bounds on EFT coefficien
ts in theories where Lorentz boosts are spontaneously broken. The well-kno
wn S-matrix argument from the Lorentz-invariant scenario does not straight
forwardly generalize to this case. Instead the analytic properties of the
retarded Green’s function of conserved currents (or of the stress-energy
tensor) will be used\, and the theory will be assumed to become conformal
in the UV. The method is general and applicable to both cosmology and con
densed matter systems. As a concrete example we will consider the EFT of c
onformal superfluids\, which describes the universal low-energy dynamics o
f CFTs at large U(1) charge\, and we will derive inequalities on the coeff
icients of the operators\, in three spacetime dimensions\, at NLO and NNLO
.

DTSTAMP:20230205T011452Z
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