Triangle Seminars
Tuesday, 12 Nov 2019
TBA
Paul Townsend
(Cambridge)
TBA
Misha Feigin
(Glasgow)
Wednesday, 13 Nov 2019
Celestial primaries, soft limits and memory effects
📍 London
Andrea Puhm
(CPHT, CNRS, Ecole polytechnique)
Abstract:
Novel insights into quantum gravity in asymptotically flat spacetimes
evolving around soft theorems in scattering amplitudes, memory effects
and asymptotic symmetries hint at an underlying holographic structure of
Minkowski spacetime: information about 4D quantum gravity might be
encoded in a 2D CFT on the celestial sphere at the conformal boundary of
Minkowski spacetime. I will discuss recent progress on this attempted
formulation of a flat space holography focusing on the 4D S-matrix which
takes the form of a 2D correlator on the celestial sphere in a conformal
basis. I will discuss how celestial conformal symmetry is generated by
"conformally soft" gravitons and how insertions of the BMS supertranslation
current in a correlator gives rise to the celestial analogue of Weinberg's
soft graviton theorem.
Novel insights into quantum gravity in asymptotically flat spacetimes
evolving around soft theorems in scattering amplitudes, memory effects
and asymptotic symmetries hint at an underlying holographic structure of
Minkowski spacetime: information about 4D quantum gravity might be
encoded in a 2D CFT on the celestial sphere at the conformal boundary of
Minkowski spacetime. I will discuss recent progress on this attempted
formulation of a flat space holography focusing on the 4D S-matrix which
takes the form of a 2D correlator on the celestial sphere in a conformal
basis. I will discuss how celestial conformal symmetry is generated by
"conformally soft" gravitons and how insertions of the BMS supertranslation
current in a correlator gives rise to the celestial analogue of Weinberg's
soft graviton theorem.
Posted by: KCL
TBA
Masanori Hanada
(Southampton)
Thursday, 14 Nov 2019
Parton branching at amplitude level
Jack Holguin
(University of Manchester)
Abstract:
TeV hadron colliders provide the backbone for modern day particle physics. As a consequence, understanding QCD radiation is a vital step in linking theory with experiment. Over the last few decades a semi-classical treatment of radiation has been hugely successful; particularly the treatment given by Monte-Carlo event generators. However, as experiments demand greater precession, the traditional approaches struggle to keep up. Recently focus has been given to fully quantum approaches to QCD radiation by working directly with amplitudes rather than semi-classical probabilities.
In my talk I will give an introduction to the current semi-classical approaches and where they fail. I'll then discuss some of the amplitude level techniques that are being developed. The amplitude techniques have broad application. I will give a case study of how these techniques can be used to elucidate coherence violation in QCD.
TeV hadron colliders provide the backbone for modern day particle physics. As a consequence, understanding QCD radiation is a vital step in linking theory with experiment. Over the last few decades a semi-classical treatment of radiation has been hugely successful; particularly the treatment given by Monte-Carlo event generators. However, as experiments demand greater precession, the traditional approaches struggle to keep up. Recently focus has been given to fully quantum approaches to QCD radiation by working directly with amplitudes rather than semi-classical probabilities.
In my talk I will give an introduction to the current semi-classical approaches and where they fail. I'll then discuss some of the amplitude level techniques that are being developed. The amplitude techniques have broad application. I will give a case study of how these techniques can be used to elucidate coherence violation in QCD.
Posted by: QMW