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The functional renormalization group in quantum field theory in curved spacetimes

Grant number: 21/07372-7
Support type:Scholarships in Brazil - Master
Effective date (Start): December 01, 2021
Effective date (End): February 28, 2023
Field of knowledge:Physical Sciences and Mathematics - Physics - Elementary Particle Physics and Fields
Principal researcher:Andre Gustavo Scagliusi Landulfo
Grantee:Níckolas de Aguiar Alves
Home Institution: Centro de Ciências Naturais e Humanas (CCNH). Universidade Federal do ABC (UFABC). Ministério da Educação (Brasil). Santo André , SP, Brazil


While Quantum Field Theory in Curved Spacetimes has solid predictions in situations involving intense (classical) gravitational fields, the so-called Functional Renormalization Group Equation (FRGE) allow us to study non-perturbative aspects of quantum field theories. When applied to the gravitational field itself, it suggests the existence of a non-trivial ultraviolet fixed point in theory space, the so-called asymptotically safe scenario for quantum gravity. Due to its non-perturbative and background-independent nature, the FRGE constitutes a powerful tool to study the non-perturbative aspects of the interaction among quantum fields and gravity. In this master's project, we intend to use the FRGE in the context of semiclassical gravity. As a first application of the formalism, we will study some aspects of qubits/detectors strongly coupled to quantum fields through the FRGE (mainly through the RG-improvement process) in the context of the Unruh/Hawking effect. After this, depending on time, we aim to start studying the problem of backreaction of the quantum fields on spacetime with particular interest on the possible implications of the existence of a non-trivial UV fixed point in such contexts. (AU)

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