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Diego Saviot
Diego Saviot
Title of the talk:
Strong-field regime within effective field theory
Abstract:
In this talk, I present an expansion of the effective action obtained when integrating out scalar QED in presence of a strong-field background. The computation is carried out in momentum space by adapting the framework of Covariant Derivative Expansion to capture non-perturbative effects. I will draw parallels with the worldline formalism both to guide the way and to compute Green functions.
I eventually specialise to the case of small inhomogeneities of a strong background and compute the first correction to the Heisenberg-Euler effective action in a derivative expansion.
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André Gontijo Campos
André Gontijo Campos
Title of the talk:
Strong-field regime within effective field theory Laboratory cosmology with free spinorial wave packets
Abstract:
The electron quantum dynamics at crossing the black hole horizon is investigated. Exploiting the equivalence principle, we show a way to emulate the electron’s dynamics via an appropriately chirped free electron wave packet, where the dynamical characteristics is encoded in the interference fringes of the wave packet. Apart from creating an analog of the gravitational effect, we deduce the electron’s explicit wavefunction at the horizon of a black hole and provide quantitative predictions on the quantum properties of the electron crossing the horizon.
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Mohammed Alkhateeb
Mohammed Alkhateeb
Title of the talk:
Computational Quantum Field Theory for Fermionic Pair Production in 1+1 Dimensions
Abstract:
Computational quantum field theory (CQFT) provides a real-time numerical framework for studying quantum field dynamics in strong, space- and time-dependent external backgrounds beyond perturbation theory. In this talk, I will first introduce the CQFT formalism in flat spacetime, demonstrating how the time evolution of first-quantized states can be used to evaluate QFT time-dependent observables such as charge densities and currents, as well as how CQFT might address the ambiguity problem of particle number at transient times.
I will then present an extension of this framework to quantum fields in curved spacetime, focusing on fermionic fields in 1+1-dimensional gravitational backgrounds. Using the vielbein formalism, I provide an effective Dirac Hamiltonian for a prescribed curved geometry and show how an appropriate field rescaling leads to a Hermitian Hamiltonian and unitary time evolution. This enables the direct numerical simulation of vacuum excitation and fermion–antifermion pair creation induced by spacetime curvature.
As an illustration, I will discuss results for a smooth, asymptotically flat spacetime generated by a localized Gaussian curvature deformation, introduced into the Minkowski vacuum as a quench. The evolution of particle number densities and total particle production is analyzed, highlighting the role of curvature strength and spatial extension and the Pauli blockade.
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