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math-ph2024
Fixed Points of Completely Positive Trace-Preserving Maps in Infinite Dimension
Roderich Tumulka, Jonte Weixler
Completely positive trace-preserving maps , also known as quantum channels, arise in quantum physics as a description of how the density operator of a system changes in a gi…
math-ph2024★ 2 cited
How a Space-Time Singularity Helps Remove the Ultraviolet Divergence Problem
Joscha Henheik, Bipul Poudyal, Roderich Tumulka
Particle creation terms in quantum Hamiltonians are usually ultraviolet divergent and thus mathematically ill defined. A rather novel way of solving this problem is based on imposi…
math-ph2024
On the Problem of Defining Charge Operators for the Dirac Quantum Field
Pablo Costa Rico, Roderich Tumulka
It is well known how to define the operator for the total charge (i.e., positron number minus electron number) on the standard Hilbert space of the second-quantized Dirac equat…