952 citations · 4.4k across the 72 of their papers we have counts for
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Goldstone bosons at non-zero temperature
Peter Lowdon, Owe Philipsen
Spontaneous symmetry breaking in quantum field theories at non-zero temperature still holds fundamental open questions, in particular what happens to vacuum Goldstone bosons when t…
Spectral properties of pseudo-scalar mesons through the QCD chiral crossover
Peter Lowdon, Owe Philipsen
We summarise recent progress towards the non-perturbative determination of thermal spectral functions for pseudo-scalar mesons in QCD by exploiting constraints imposed by micro-cau…
Non-perturbative constraints on perturbation theory at finite temperature
Peter Lowdon, Owe Philipsen
It has long been understood that the inclusion of temperature in the perturbative treatment of quantum field theories leads to complications that are not present at zero temperatur…
On the (in)consistency of perturbation theory at finite temperature
Peter Lowdon, Owe Philipsen
A well-known difficulty of perturbative approaches to quantum field theory at finite temperature is the necessity to address theoretical constraints that are not present in the vac…
Real-time observables from Euclidean thermal correlation functions
Peter Lowdon, Ralf-Arno Tripolt
In this work we apply a local quantum field theory approach in order to analyse the connection between real-time observables and Euclidean thermal correlation functions. In particu…
Comparing light-front quantization with instant-time quantization
Philip D. Mannheim, Peter Lowdon, Stanley J. Brodsky
We compare light-front quantization and instant-time quantization both at the level of operators and at the level of their Feynman diagram matrix elements. At the level of operator…