A Little Paradox

Lazar Mayants

The cat paradox a little about paradoxes more about Schrodinger's cat what is probability? concrete objects classes of concrete objects abstract objects the key principle Einstein-Podolsky-Rosen's (EPR's) paradox angular momentum and spin Bohm's paradox polarization of photons aspect's experiment a short stop for reflections properties of concrete human beings mutual understanding an individual and society social sciences, utopias and doctrines how reliable is a poll? probabilities revisited states and beyond what is quantum physics? the Schrodinger equation - its origin and meaning what is a particle? Is it a corpuscle, a wave, or both? the double-slit Gedankenexperiment - what does it prove? Wheeler's delayed choice experiment a brief discussion of the Heisenberg's uncertainty principle is the world real? the mystery of the photon.

Milton A. Rothman, Robert D. Romanyshyn

Daniel Parrochia

This article is devoted to the study of which appears as the most famous paradoxes of quantum theory (Schrodinger cat, EPR argument and Aspect experiments, delayed choice experiments and retrocausality problems). Through these experiments, physics raises so fundamental questions that it borders, at the limit, with metaphysics. The present article supports the idea that the difficulties encountered, so puzzling they are, manifest only a transitional state of the evolution of physics, that can be expected to be outdated one day. In the meantime, caution is necessary to avoid the excesses that could lead to metaphysical considerations a little too premature.

X. Gutiérrez de la Cal, M. Alkhateeb, M. Ll. Pons +2 more

We analyse a little known aspect of the Klein paradox. A Klein-Gordon boson appears to be able to cross a supercritical rectangular barrier without being reflected, while spending there a negative amount of time. The transmission mechanism is demonstrably acausal, yet an attempt to construct the corresponding causal solution of the Klein-Gordon equation fails. We relate the causal solution to a divergent multiple-reflections series, and show that the problem is remedied for a smooth barrier, where pair production at the energy equal to a half of the barrier's height is enhanced yet remains finite.