Is Detection of Fitzgerald-Lorentz Contraction Possible?

TL;DR

This paper argues that visual detection of Fitzgerald-Lorentz contraction is impossible and that measured length contraction depends on synchronization conventions, making it inherently ambiguous and not visually observable.

Contribution

It demonstrates, using spacetime diagrams, that visual perception cannot detect length contraction and that measurements depend on synchronization choices, clarifying misconceptions.

Findings

Visual perception cannot detect Fitzgerald-Lorentz contraction.

Measured length depends on clock synchronization conventions.

Fitzgerald-Lorentz factor is not visually observable.

Abstract

Visual perception of Fitzgerald-Lorentz contraction is known to be theoretically impossible, and this can be demonstrated pedagogically with the aid of simple spacetime diagrams of one spatial dimension. Such diagrams also demonstrate, simply and directly, that the apparent length of a moving meter stick changes as it passes by and can even look elongated. In addition, measurement of a moving meter stick with instruments, as opposed to visual perception, must be inherently ambiguous, as the length measured depends on clock synchronization, which is widely considered to be conventional. In fact, for some synchronization choices, a moving meter stick would be measured as greater than one meter. Thus, the well known Fitzgerald-Lorentz contraction factor $\sqrt {1-v^2/c^2} $ would generally not be seen visually, and would only be measured in a system employing one particular (Einstein) synchronization convention.