# Current Sagnac Effect Theory: PF Viewpoint

• HarryWertM
In summary, the most accepted theory for explaining the Sagnac effect is the Special Theory of Relativity, which is a classical effect that is part of the larger issue of rotating reference frames. There is ongoing debate among physicists, including Klauber, about the proper relativistic interpretation of this phenomenon.

#### HarryWertM

In the view of PF posters, what is the "current" [meaning most accepted] theory explaining the Sagnac effect? I have heard of something called Klauber's NTO [Non-Time-Orthogonality] theory and am wondering if it is "accepted"?
-Harry Wertmuller

HarryWertM said:
In the view of PF posters, what is the "current" [meaning most accepted] theory explaining the Sagnac effect? I have heard of something called Klauber's NTO [Non-Time-Orthogonality] theory and am wondering if it is "accepted"?
-Harry Wertmuller

The currently most accepted theory that explains the Sagnac effect is called the Special Theory of Relativity.

As kev has pointed out, Special Relativity accounts for the Sagnac effect. It is probably relevant to add that, although some authors refer to the effect as being a "Special Relativity effect" per se, in his mathpages Kevin Brown points out that actually it is a classical effect, because it doesn't involve second order metric effects on lengths, times, etc. that more properly call for the designation, "relativistic." Certainly, Sagnac himself saw it as a classical effect, explicable in terms of the ether paradigm.

Also relevant is that the Sagnac effect is but part of the more general "problem" of rotating reference frames. Although many regard this as not really a problem, being accounted for by Einstein's theories, among some physicists, including Klauber, the proper relativistic interpretation is a lively topic of debate. (See the book, Relativity in Rotating Frames, Eds., G Rizzi and M. L. Ruggiero).

## What is the Sagnac effect?

The Sagnac effect refers to the phenomenon of a phase shift in a light beam that travels in a closed loop in a rotating system. It was first observed by French physicist Georges Sagnac in 1913.

## What is the PF viewpoint in Sagnac effect theory?

The PF viewpoint, also known as the "preferred frame" viewpoint, suggests that there is a special reference frame in which the laws of physics are most accurately described. This viewpoint is often used to explain the Sagnac effect.

## What is the current Sagnac effect theory?

The current Sagnac effect theory, also known as the "conventional theory", states that the phase shift observed in a rotating system is due to the difference in the travel time of light in opposite directions, caused by the rotation of the system itself.

## Is the Sagnac effect considered a proven theory?

Yes, the Sagnac effect has been extensively studied and verified through numerous experiments. It is considered a well-established phenomenon in the field of physics.

## What are the applications of the Sagnac effect?

The Sagnac effect has been used in various applications, such as in ring laser gyroscopes for navigation, interferometers for measuring rotation, and in fiber optic gyroscopes for precise measurements in aerospace and defense industries.