Cosmological infrared subtractions & infrared-safe computables
Copyright policy )Cosmological infrared subtractions & infrared-safe computables
Cosmological observables in perturbation theory turn out to be plagued with infrared divergences, which represents both a conceptual and computational challenge. In this paper we present a proof of concept for a systematic procedure to remove these divergences in a large class of scalar cosmological integrals and consistently define an infrared safe computable in perturbation theory. We provide diagrammatic rules which are based on the nestohedra underlying the asymptotic structure of such integrals.
High Energy Physics - Theory, Physics, QC1-999, infrared divergence, FOS: Physical sciences, Methods of quantum field theory in general relativity and gravitational theory, scalar field, General Relativity and Quantum Cosmology (gr-qc), Quantum field theory on curved space or space-time backgrounds, General Relativity and Quantum Cosmology, High Energy Physics - Theory (hep-th), Combinatorics, cosmological perturbation theory, FOS: Mathematics, Combinatorics (math.CO), Relativistic cosmology
High Energy Physics - Theory, Physics, QC1-999, infrared divergence, FOS: Physical sciences, Methods of quantum field theory in general relativity and gravitational theory, scalar field, General Relativity and Quantum Cosmology (gr-qc), Quantum field theory on curved space or space-time backgrounds, General Relativity and Quantum Cosmology, High Energy Physics - Theory (hep-th), Combinatorics, cosmological perturbation theory, FOS: Mathematics, Combinatorics (math.CO), Relativistic cosmology
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