151 citations · 1.9k across the 76 of their papers we have counts for
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One loop photon-graviton mixing in an electromagnetic field: Part 3
Naser Ahmadiniaz, Fiorenzo Bastianelli, Felix Karbstein und Christian Schubert
Photon-graviton conversion in an electromagnetic field is a well-known prediction of Einstein-Maxwell theory. First discussed at tree-level by Gertsenshtein in 1962, more recently…
Pair production of massive charged vector bosons from the worldline
Fiorenzo Bastianelli, Filippo Fecit, Alessandro Miccichè
We investigate a worldline formulation for a massive spin-1 particle interacting with an electromagnetic background. Two first-quantized descriptions of the spin degrees of freedom…
Gluon amplitudes in first quantization
Fiorenzo Bastianelli, Roberto Bonezzi, Olindo Corradini +1
We compute tree-level gluon amplitudes as worldline correlators of vertex operators in a bosonic spinning particle model. In this framework, the particle's position degrees of free…
Unified worldline treatment of Yukawa and axial couplings
F. Bastianelli, O. Corradini, J. P. Edwards +2
We provide a worldline representation of the one-loop effective action for a Dirac particle coupled to external scalar, pseudoscalar, vector and axialvector fields. Extending previ…
Six-dimensional one-loop divergences in quantum gravity from the spinning particle
Fiorenzo Bastianelli, Francesco Comberiati, Filippo Fecit +1
In this work, we investigate the computation of the counterterms necessary for the renormalization of the one-loop effective action of quantum gravity using both the worldline form…
Worldline path integrals for the graviton
Fiorenzo Bastianelli, Mattia Damia Paciarini
We present an extension to arbitrary dimensions of a worldline path integral approach to one-loop quantum gravity, which was previously formulated in four spacetime dimensions. By…
Gauge-invariant coefficients in perturbative quantum gravity
Fiorenzo Bastianelli, Roberto Bonezzi, Marco Melis
Heat kernel methods are useful for studying properties of quantum gravity. We recompute here the first three heat kernel coefficients in perturbative quantum gravity with cosmologi…
Chiral fermions, dimensional regularization, and the trace anomaly
Fiorenzo Bastianelli, Luca Chiese
We investigate the trace anomaly of a chiral fermion in dimensional regularization, considering in detail the simplest case of coupling to an abelian gauge field. We apply the Brei…
Obtaining fully polarised amplitudes in gauge invariant form
Naser Ahmadiniaz, Victor Miguel Banda Guzman, Christian Schubert +3
We describe progress applying the \textit{Worldline Formalism} of quantum field theory to the fermion propagator dressed by -photons to study multi-linear Compton scattering pro…
Light bending from eikonal in worldline quantum field theory
Fiorenzo Bastianelli, Francesco Comberiati, Leonardo de la Cruz
Using the worldline quantum field theory (WQFT) formalism for classical scattering, we study the deflection of light by a heavy massive spinless/spinning object. WQFT requires the…
Worldline description of a bi-adjoint scalar and the zeroth copy
Fiorenzo Bastianelli, Francesco Comberiati, Leonardo de la Cruz
Bi-adjoint scalars are helpful in studying properties of color/kinematics duality and the double copy, which relates scattering amplitudes of gauge and gravity theories. Here we st…
Path integral calculation of heat kernel traces with first order operator insertions
Fiorenzo Bastianelli, Francesco Comberiati
We study generalized heat kernel coefficients, which appear in the trace of the heat kernel with an insertion of a first-order differential operator, by using a path integral repre…
Worldline master formulas for the dressed electron propagator, part 1: Off-shell amplitudes
Naser Ahmadiniaz, Victor Miguel Banda Guzman, Fiorenzo Bastianelli +3
In the first-quantised worldline approach to quantum field theory, a long-standing problem has been to extend this formalism to amplitudes involving open fermion lines while mainta…
Reducible contributions to the propagator and EHL in background fields
N. Ahmadiniaz, F. Bastianelli, O. Corradini +2
We briefly discuss the recent discovery of reducible contributions to QED effective actions due to the presence of external electromagnetic fields at tree level and higher loop-ord…
Axial gravity and anomalies of fermions
Fiorenzo Bastianelli, Matteo Broccoli
We consider a Dirac fermion in a metric-axial-tensor (MAT) background. By regulating it with Pauli-Villars fields we analyze and compute its full anomaly structure. Appropriate lim…
One-loop quantum gravity from the N=4 spinning particle
Fiorenzo Bastianelli, Roberto Bonezzi, Olindo Corradini +1
We construct a spinning particle that reproduces the propagation of the graviton on those curved backgrounds which solve the Einstein equations, with or without cosmological consta…
Weyl fermions in a non-abelian gauge background and trace anomalies
Fiorenzo Bastianelli, Matteo Broccoli
We study the trace and chiral anomalies of Weyl fermions in a non-abelian gauge background in four dimensions. Using a Pauli-Villars regularization we identify the trace anomaly, p…
Simplified path integral for supersymmetric quantum mechanics and type-A trace anomalies
Fiorenzo Bastianelli, Olindo Corradini, Laura Iacconi
Particles in a curved space are classically described by a nonlinear sigma model action that can be quantized through path integrals. The latter require a precise regularization to…
On the simplified path integral on spheres
Fiorenzo Bastianelli, Olindo Corradini
We have recently studied a simplified version of the path integral for a particle on a sphere, and more generally on maximally symmetric spaces, and proved that Riemann normal coor…
Quantum mechanical path integrals in curved spaces and the type-A trace anomaly
Fiorenzo Bastianelli, Olindo Corradini, Edoardo Vassura
Path integrals for particles in curved spaces can be used to compute trace anomalies in quantum field theories, and more generally to study properties of quantum fields coupled to…
On the trace anomaly of a Weyl fermion
Fiorenzo Bastianelli, Riccardo Martelli
We calculate the trace anomaly of a Weyl fermion coupled to gravity by using Fujikawa's method supplemented by the choice of a consistent regulator. The latter is constructed out o…
Dressed scalar propagator in a non-abelian background from the worldline formalism
Naser Ahmadiniaz, Fiorenzo Bastianelli, Olindo Corradini
We study the propagator of a colored scalar particle in the background of a non-abelian gauge field using the worldline formalism. It is obtained by considering the open worldline…
A worldline approach to colored particles
Fiorenzo Bastianelli, Roberto Bonezzi, Olindo Corradini +2
Relativistic particle actions are a useful tool to describe quantum field theory effective actions using a string-inspired first-quantized approach. Here we describe how to employ…
Graviton self-energy from worldlines
Fiorenzo Bastianelli, Roberto Bonezzi
Worldline approaches, when available, often simplify and make more efficient the calculation of various observables in quantum field theories. In this contribution we first review…