44 citations · 584 across the 46 of their papers we have counts for
48 papers
A New Bound on Light-by-Light Scattering in the Low-Energy Regime
Aimé Matheron, Michal Šmíd, Felix Karbstein +76
The superposition principle at the heart of optics states that electromagnetic fields do not interact in vacuum. This principle is not universal, instead electromagnetic fields cou…
Classical versus non-classical photon states for detecting vacuum non-linearity
N. Ahmadiniaz, C. Kohlfürst, R. Shaisultanov +1
Quantum electrodynamics (QED) predicts that the vacuum should behave as a non-linear medium. For many schemes aimed at verifying this fundamental prediction, the signal consists of…
Quantum Zeno effect versus adiabatic quantum computing and quantum annealing
Naser Ahmadiniaz, Dennis Kraft, Gernot Schaller +1
For the adiabatic version of Grover's quantum search algorithm as proposed by Roland and Cerf, we study the impact of decoherence caused by a rather general coupling to some enviro…
Relativistic Quantum Kinetic Theory: Higher order contributions in assisted Schwinger pair production
James P. Edwards, Naser Ahmadiniaz, Sebastian M. Schmidt +1
Quantum kinetic theory is an important tool for studying non-equilibrium, non-perturbative and non-linear interactions within an open quantum system, and as such is able to provide…
Worldline integration of photon amplitudes
Naser Ahmadiniaz, Victor M. Banda Guzmán, James P. Edwards +5
It has been known for many years that methods inspired by string theory, such as the worldline formalism, allow one to write down integral representations that combine large number…
Low-energy limit of N-photon amplitudes in a constant field
Naser Ahmadiniaz, Misha A. Lopez-Lopez, Christian Schubert
While the QED photon amplitudes at full momentum so far have been calculated only up to the six-photon level, in the low-energy limit there are explicit formulas for all helicity c…
Assisted neutrino pair production in combined external fields
Naser Ahmadiniaz, Rashid Shaisultanov, Ralf Schützhold
Neutrino--antineutrino () pair production is one of the main processes responsible for the energy loss of stars. Apart from the collision of two () or three ($…
The QED four-photon amplitudes off-shell: part 2
Naser Ahmadiniaz, Cristhiam Lopez-Arcos, Misha A. Lopez-Lopez +1
This is the second one of a series of four papers devoted to a first calculation of the scalar and spinor QED four-photon amplitudes completely off-shell. We use the worldline form…
Field-assisted birefringent Compton scattering
N. Ahmadiniaz, T. E. Cowan, M. Ding +4
Motivated by experimental initiatives such as the Helmholtz International Beamline for Extreme Fields (HIBEF), we study Compton scattering of x-rays at electrons in a strong extern…
Local Neumann semitransparent layers: resummation, pair production and duality
N. Ahmadiniaz, S. A. Franchino-Viñas, L. Manzo +1
We consider local semitransparent Neumann boundary conditions for a quantum scalar field as imposed by a quadratic coupling to a source localized on a flat codimension-one surface.…
Summing Feynman diagrams in the worldline formalism
Naser Ahmadiniaz, James P. Edwards, Cristhiam Lopez-Arcos +4
The worldline formalism shares with string theory the property that it allows one to write down master integrals that effectively combine the contributions of many Feynman diagrams…
Detection schemes for quantum vacuum diffraction and birefringence
N. Ahmadiniaz, T. E. Cowan, J. Grenzer +6
Motivated by recent experimental initiatives, such as at the Helmholtz International Beamline for Extreme Fields (HIBEF) at the European X-ray Free Electron Laser (XFEL), we calcul…
Generalized Gelfand-Dikii equation for fermionic Schwinger pair production
Naser Ahmadiniaz, Sang Pyo Kim, Christian Schubert
Schwinger pair creation in a purely time-dependent electric field can be reduced to an effective quantum mechanical problem using a variety of formalisms. Here we develop an approa…
Generalized Gelfand-Dikii equation and solitonic electric fields for fermionic Schwinger pair production
Naser Ahmadiniaz, Alexander M. Fedotov, Evgeny G. Gelfer +2
In previous work on Schwinger pair creation in purely time-dependent fields, it was shown how to construct ``solitonic'' electric fields that do not create scalar pairs with an arb…
Generalized LKF transformations for -point fermion correlators in QED
José Nicasio, Christian Schubert, Naser Ahmadiniaz +1
Within the worldline approach to quantum electrodynamics (QED), a change of the photon's covariant gauge parameter is investigated to analyse the non-perturbative gauge depende…
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…
Quantum Zeno Manipulation of Quantum Dots
N. Ahmadiniaz, M. Geller, J. König +4
We investigate whether and how the quantum Zeno effect, i.e., the inhibition of quantum evolution by frequent measurements, can be employed to isolate a quantum dot from its surrou…
Tadpole contribution to magnetic photon-graviton conversion
Naser Ahmadiniaz, Fiorenzo Bastianelli, Felix Karbstein +1
Photon-graviton conversion in a magnetic field is a process that is usually studied at tree level, but the one-loop corrections due to scalars and spinors have also been calculated…
Manifest colour-kinematics duality and double-copy in the string-based formalism
Naser Ahmadiniaz, Filippo Maria Balli, Olindo Corradini +3
The relation for the gravity polarisation tensor as the tensor product of two gluon polarisation vectors has been well-known for a long time, but a version of this relation for mul…
Sauter-Schwinger effect for colliding laser pulses
Christian Kohlfürst, Naser Ahmadiniaz, Johannes Oertel +1
Via a combination of analytical and numerical methods, we study electron-positron pair creation by the electromagnetic field of two…
Worldline master formulas for the dressed electron propagator, part 2: On-shell amplitudes
Naser Ahmadiniaz, Victor Miguel Banda Guzman, Fiorenzo Bastianelli +3
In the first part of this series, we employed the second-order formalism and the ``symbol'' map to construct a particle path-integral representation of the electron propagator in a…
Color-kinematics duality from the Bern-Kosower formalism
Naser Ahmadiniaz, Filippo Maria Balli, Cristhiam Lopez-Arcos +2
Berends-Giele currents are fundamental building blocks for on-shell amplitudes in non-abelian gauge theory. We present a novel procedure to construct them using the Bern-Kosower fo…
The Generalised LKF Transformations for Arbitrary -point Fermion Correlators
Naser Ahmadiniaz, James P. Edwards, José Nicasio +1
We examine the non-perturbative gauge dependence of arbitrary configuration space fermion correlators in quantum electrodynamics (QED). First, we study the dressed electron propaga…
On the observability of field-assisted birefringent Delbrück scattering
N. Ahmadiniaz, M. Bussmann, T. E. Cowan +3
We consider the scattering of an x-ray free-electron laser (XFEL) beam on the superposition of a strong magnetic field with the Coulomb field …