[phys4phys] Group for Gravitation, Particle and Fields seminar, Friday, 12 April 2024

[dgocanin]

Dear colleagues,

You are cordially invited to the seminar of the Group for Gravitation, 
Particles and Fields, which will be held on Friday, 12 April 2024, at 
11:00 at the Institute of Physics Belgrade, lecture hall 360.

The talk entitled

Perturbiner expansion: old and new

will be given by Guillaume Trojani (Heriot-Watt University, Edinburgh, 
UK).

Abstract: In their seminal, Berends and Giele identified an efficient 
algorithm for computing n-point tree level scattering amplitudes in 
gauge theory. Later,  the pertubiner expansion was developed to generate 
the Berends-Giele recursion relation to study any quantum field theory 
at tree level. This talk aims to reintroduce these techniques in the 
light of the modern language of homotopy algebras, with an eye towards 
the recent development of loop level techniques. Indeed, the recursion 
relations are natural consequences of the Homotopy perturbation lemma 
relating an interacting field theory and its underlying free theory. 
Time permitting, I will comment on current work where we apply this 
algebraic machinery to braided field theories, which are noncommutative 
field theories deformed in a controlled manner.


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Time: April 12, 2024 11:00 Belgrade

Institute of Physics Belgrade, lecture hall 360, 2nd floor

BigBlueButton platform link: 
https://gravityserver.ipb.ac.rs/b/mar-ae0-f4q-qww

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Best regards,
Dragoljub