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quant-ph2026
Superposition of dynamics, indefinite causal order, and quantum histories
Charis Anastopoulos, Ntina Savvidou
The process-matrix formalism describes quantum processes without assuming a fixed global causal order, but the physical meaning of indefinite causal order remains open. We address…
quant-ph2026
Beyond the Unruh vacuum: multi-time correlations in black hole collapse and evaporation
Konstantinos Xenos, Charis Anastopoulos, Andreas F. Terzis
The black hole information paradox originates from the thermal character of Hawking radiation, which appears to erase information about the collapsing matter. However, thermality c…
quant-ph2026
Quantum field theory measurements for relativistic particles
Nadia Koliopoulou, Charis Anastopoulos, Ntina Savvidou
The formulation of a consistent measurement theory for relativistic quantum fields has become a problem of growing foundational and practical significance. Standard non-relativisti…