5 papers
What is electric charge?: Charge as a local observable in relativistic quantum field theory
Hideyasu Yamashita
It is rather surprising that modern quantum physics does not appear to have provided any clear answer to the simple question ``what is electric charge?''. Even when the total charg…
A skepticism on the concept of quantum state related to quantum field theory on curved spacetime
Hideyasu Yamashita
Some skeptical arguments on the physical reality of quantum states are given. First, I argue that the algebraic formalism of quantum field theory in curved spacetime (algebraic QFT…
A note on the conceptual problems on the Unruh effect
Hideyasu Yamashita
This brief note is written with a somewhat similar purpose to Earman's 2011 paper on the conceptual problems on the Unruh effect. However, we confine ourselves to Sewell's modular…
The empirical laws for Majorana fields in a curved spacetime
Hideyasu Yamashita
This article is a sequel to our previous paper (arXiv:2511.12311), where we considered the conceptual problem on the empirical laws for the Klein\textendash Gordon quantum field th…
The conditional probabilities and the empirical laws in a free scalar QFT in curved spacetime
Hideyasu Yamashita
Unlike QFT in Minkowski spacetime (QFTM), QFT in curved spacetime (QFTCS) suffers from a conceptual obscurity on the empirical (experimentally verifiable/falsifiable) laws. We prop…