21 citations · 145 across the 17 of their papers we have counts for
4 papers · 1 filter
Multi-time formulation of particle creation and annihilation via interior-boundary conditions
Matthias Lienert, Lukas Nickel
Interior-boundary conditions (IBCs) have been suggested as a possibility to circumvent the problem of ultraviolet divergences in quantum field theories. In the IBC approach, partic…
Interacting relativistic quantum dynamics of two particles on spacetimes with a Big Bang singularity
Matthias Lienert, Roderich Tumulka
Relativistic quantum theories are usually thought of as being quantum field theories, but this is not the only possibility. Here we consider relativistic quantum theories with a fi…
A new class of Volterra-type integral equations from relativistic quantum physics
Matthias Lienert, Roderich Tumulka
Here we study a new kind of linear integral equations for a relativistic quantum-mechanical two-particle wave function , where are spacetime points. In the ca…
Direct interaction along light cones at the quantum level
Matthias Lienert
Here, we point out that interactions with time delay can be described at the quantum level using a multi-time wave function , i.e., a wave function depending on one…