Reply to the comment on "Frame-dragging: meaning, myths, and misconceptions" by A. Deriglazov

TL;DR

This paper refutes claims that the Sagnac coordinate time delay expression differs from standard interpretations, clarifying misconceptions and emphasizing the consistency of the existing formulas with established physics and experiments.

Contribution

It clarifies that the Sagnac effect expression in [arXiv:2109.14641] aligns with standard literature and corrects misconceptions about its relation to Landau-Lifshitz's treatment.

Findings

The Sagnac effect is not discussed in Landau-Lifshitz.

The expression in [arXiv:2109.14641] is standard and widely accepted.

Confusing the two-way trip time with Sagnac delay negates experimental evidence.

Abstract

It has been claimed in [arXiv:2110.09522] that the expression for the Sagnac coordinate time delay given in [arXiv:2109.14641] "differs from the standard interpretation described in the book by Landau-Lifshitz (LL)". We note that: 1) the Sagnac effect is not even discussed in LL; 2) the expression in [arXiv:2109.14641] is standard, given in countless papers and even textbooks; 3) the expression by LL quoted by the author consists of the (infinitesimal) two-way trip travel time for a light signal, which the author confuses with the Sagnac time delay (when they are actually very different things); 4) such confusion would negate the existence, both in special and general relativity, of the well-known and experimentally tested Sagnac effect; 5) the claims that it sheds doubt in any of the assertions made in [arXiv:2109.14641] are completely unfounded.