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quant-ph2026
Response theory for quantum fields in isolation
Stefan Floerchinger
Response theory describes the reaction of observales to perturbations in external fields. We review this formalism for quantum fiels in isolation that have unitary time evolution.…
gr-qc2026
Superluminal modes in a quantum field simulator for cosmology from analog trans-Planckian physics
Christian F. Schmidt, Stefan Floerchinger
The quantum-field-theoretic description for the U(1)-Goldstone boson of a scalar Bose-Einstein condensate with time-dependent contact interactions is developed beyond the acoustic…