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SUMMARY:Status of Soft Theorem in D=4 (Its application in classical limit
and understanding as Ward identity) (Quantum Spacetime Series Seminar)
DTSTART;VALUE=DATE-TIME:20190819T060000Z
DTEND;VALUE=DATE-TIME:20190819T070000Z
DTSTAMP;VALUE=DATE-TIME:20191019T095027Z
UID:indico-event-7300@cern.ch
DESCRIPTION:In recent years we explored the understanding of factorization
property of the S-matrix for a theory containing massless particles(photo
n/graviton) when the energy of external massless particles are small (soft
particles). Though the leading factorization is discovered long ago (1965
) by Weinberg\, it's understanding in the subleading order (not restricted
to tree level) was not explored prior to our (with Sen) work due to the i
nfrared divergence of S-matrix in D=4. For loop corrected S-matrix\, we fo
und that the subleading soft factorization contains terms logarithmic in s
oft energy. The classical limit of this logarithmic terms in soft graviton
theorem provides a new classical tail memory with the known permanent shi
ft between the mirrors of gravitational wave detector. Currently\, we are
trying to understand whether this soft factorization can be understood as
the Ward identity of any asymptotic symmetry.\n\nhttps://indico.tifr.res.i
n/indico/conferenceDisplay.py?confId=7300
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7300
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