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## Summary:

- about the significance of speed to attach to the 'speed of light in vacuum' in the context of SR non inertial frame of reference

## Main Question or Discussion Point

Hi,

I read various threads in PF about the concept of invariant speed and the speed of light in vacuum that in our universe happens to be the same as the 'invariant speed'.

My doubt is about the speed of the light in vacuum as measured from a non-inertial frame (basically in the context of SR a physical frame such that an accelerometer attached to it reads a non-zero acceleration).

First point: how can we define it in a non-inertial frame of reference ? I guess the only way to define it is via 'coordinate labels ' in order to get a 'coordinate speed' for it

Second point: does it exist an 'invariant way' to define it ?

Thanks.

I read various threads in PF about the concept of invariant speed and the speed of light in vacuum that in our universe happens to be the same as the 'invariant speed'.

My doubt is about the speed of the light in vacuum as measured from a non-inertial frame (basically in the context of SR a physical frame such that an accelerometer attached to it reads a non-zero acceleration).

First point: how can we define it in a non-inertial frame of reference ? I guess the only way to define it is via 'coordinate labels ' in order to get a 'coordinate speed' for it

Second point: does it exist an 'invariant way' to define it ?

Thanks.

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