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Quantum corrections without loops and in four space-time dimensions

Trobada 2016/2017 
 04 04 2017 12:00
IFIC Seminar Room (Paterna)
Germán Rodrigo
Instituto de Física Corpuscular
Quantum field theory is poorly defined in four space-time dimensions due to unphysical configurations introduced by quantum corrections. These unphysical configurations lead to the proliferation of infinities that are usually regulated by modifying the dimensions of the space-time. In this talk we introduce a new regularization scheme, called four-dimensional unsubtraction (FDU), which is based on the loop-tree duality (LTD). The LTD allows to rewrite loop scattering amplitudes in terms of tree-level dual amplitudes, and provides a very intuitive view over the origin of the singularities and their interpretation in terms of causality.  The FDU allows to perform the summation over degenerate states by introducing a suitable mapping of momenta, in such a way that higher order perturbative calculations can directly be performed in four space-time dimensions. We illustrate the power of the formalism with benchmark physical examples, the proof of the universality of the Higgs boson interactions, and the direct application to asymptotic expansions.

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All Dates

  • 04 04 2017 12:00

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