Description of Experiments in Physics: A Dynamical Approach

Kavan Kishore Modi

A central aim of physics is to describe the dynamics of physical systems. Schrödinger's equation does this for isolated quantum systems. Describing the time evolution of a quantum system that interacts with its environment, in its most general form, has proved to be difficult because the dynamics is dependent on the state of the environment and the correlations with it. For discrete processes, such as quantum gates or chemical reactions, quantum process tomography provides the complete description of the dynamics, provided that the initial states of the system and the environment are independent of each other. However, many physical systems are correlated with the environment at the beginning of the experiment. Here, we give a prescription of quantum process tomography that yields the complete description of the dynamics of the system even when the initial correlations are present. Surprisingly, our method also gives quantitative expressions for the initial correlation.

Hans M. Mark, N. Thomas Olson

Avshalom C. Elitzur, Shahar Dolev

We present some novel results indicating that time's description in present-day physics is deficient. We use Hawking's information-erasure hypothesis to counter his own claim that time's arrow depends only on initial conditions. Next, we propose quantum mechanical experiments that yield inconsistent histories, sug- gesting that not only events but also entire histories might be governed by a more fundamental dynamics. 1. The Stalemate The problem associated with time's nature is well known. It stems from two aspects of time that cannot be reconciled:

Andrzej Radosz, Katarzyna Ostasiewicz, Fedor Vasilievich Kusmartsev +5 more

Victor Stoyanov

Abstract In this work, the double-slit experiment is analyzed within the framework of Medium Theory SMT, where space-time is described as a nonlinear physical medium Φ. Instead of treating interference as a purely probabilistic quantum phenomenon, SMT interprets the observed pattern as the result of coherent phase dynamics and elastic deformations of the underlying medium. It is shown that propagating δΦ-perturbations naturally produce interference structures through phase coherence and nonlinear medium response, while localized particle-like configurations correspond to stable topological excitations of Φ. The emergence of the standard interference law follows directly from the medium dynamics without invoking wavefunction collapse or intrinsic randomness. The SMT description provides a unified physical mechanism for wave–particle duality, coherence loss, and pattern formation in the double-slit experiment, linking quantum behavior to deterministic field dynamics of the physical medium.