Re: What is a photon

Den 12.06.2025 06:12, skrev Thomas Heger:

 Velocity IS frame-dependent!
 This is inevitable and also the case for light.

No.
It is experimentally confirmed that the speed of light in vacuum
is invariant, which means that it is the same in all inertial
frames of reference.
https://paulba.no/paper/Kennedy_Thorndike.pdf
https://paulba.no/paper/Michelson_1913.pdf
https://paulba.no/paper/Alvager_et_al.pdf
https://paulba.no/paper/Babcock_Bergman.pdf
https://paulba.no/paper/Brecher.pdf
This is what all the cranks in this forum fail to understand.
Their problem is that because they find it counter intuitive
they think it can't be like that.
But it is!

 BUT: we can use this to define light:
 light (and other frequencies of the em-spectrum) are light, if they move with c.

So you think that the speed of light is frame dependent,
but can be defined to be frame independent? :-D
The speed of light couldn't be defined to be invariant if it isn't.
But since the speed of light in vacuum is invariant,
there is but one speed of light, and we are free to choose
the numeric value of it. This is in fact a chose of units.
The SI definition of the speed of light is c = 299792458 m/s
The SI definition of second is:
The ground-state hyperfine transition frequency of
the caesium-133 atom, is 9,192,631,770 Hz (1/s)
The definition of metre follows from these definitions.

 Other 'influences' might be possible, but are not light.
   This is also a defining statement, and it is compatible with the main principle of relativity.
 Incompatible, on the other hand, is a certain paradigme:
 to 'materialise' light.
 This is so, because any 'ballistic' or 'material' theory of light would get in conflict with the definition of the term 'light' from above.
  Instead we need to consider a continuum, where light is actually a certain state.
 This would allow us to reinterpret the so called 'photo electric effect':
in this system electrons and photons are actually the same 'structures', but electrons are not moving, while photons do.
  TH

Confused, Thomas? :-D
--
Paul
https://paulba.no/