Physics Help Forum photon viewpoint
 User Name Remember Me? Password

 Physics Physics Forum - General Physics Discussion and Physics News

 Jun 19th 2019, 07:32 PM #1 Junior Member   Join Date: Jun 2019 Posts: 8 photon viewpoint From the perspective of a photon, are all photons on top of each other in the same place?
Jun 19th 2019, 10:00 PM   #2

Join Date: Apr 2008
Location: On the dance floor, baby!
Posts: 2,730
 Originally Posted by wavesearcher From the perspective of a photon, are all photons on top of each other in the same place?
What do you mean "on top of each other"?

Now, particles traveling at the speed of light are a little tricky to talk about but I'll give you a quick rundown.

As an object goes faster and faster it "sees" the distance along its direction get smaller. This is the Fitzgerald contraction. As a result the faster the object goes the shorter the trip. (In the object's reference frame, of course.) We can take the limit of this idea as apply it to photons.... It takes a photon no time at all to get from one place to another. (wrt the reference frame on the photon.)

As far as a "pile up" is concerned the photons may not age at all between particles to interact with but there is nothing to say that they all arrive at the same time.

That's the best guess I can make. Does that answer your question or is it something else you were asking about?

-Dan
__________________
Do not meddle in the affairs of dragons for you are crunchy and taste good with ketchup.

See the forum rules here.

 Jun 19th 2019, 10:29 PM #3 Junior Member   Join Date: Jun 2019 Posts: 8 length contraction I was thinking that as any particle approaches the speed of light the length it measures in the direction of travel contracts so that at lightspeed it is zero. if we assume the wavefunction of the photon travels out in all directions and the length in each direction is zero then ... In other words for a photon there is no time or space?
 Jun 20th 2019, 03:14 AM #4 Senior Member   Join Date: Mar 2019 Location: cosmos Posts: 398 @wavesearcher: Ah, according to your derivation, a photon is similiar to a singurality... a singurality is something "between existence and nonexistence" or even "nonexistence" while even a pig know that photon is "existence"...no bad...
Jun 20th 2019, 03:23 AM   #5
Senior Member

Join Date: Oct 2017
Location: Glasgow
Posts: 394
 Originally Posted by wavesearcher I was thinking that as any particle approaches the speed of light the length it measures in the direction of travel contracts so that at lightspeed it is zero. if we assume the wavefunction of the photon travels out in all directions and the length in each direction is zero then ... In other words for a photon there is no time or space?
It's relative speed that matters, not the speed of the observer. Just because photons travel at speed c in a vacuum, it doesn't mean that all of their relative velocities are always c.

 Jun 20th 2019, 08:49 AM #6 Junior Member   Join Date: Jun 2019 Posts: 8 relative speed Yes but light travels at the same speed for all observers which means that from the viewpoint of the light all observers, planets, stars, spaceships, ect are moving towards it at the speed of light. Therefore the distance to all those places is zero.
 Jun 20th 2019, 08:55 AM #7 Senior Member     Join Date: Jun 2016 Location: England Posts: 932 What is Distance? The way photons "experience" distance and time has bothered me for a while. A simple interpretation of the relativistic contractions would seem to indicate that as measured by the photon that is mediating an interaction between two electrons, there is no distance between the two electrons and the transfer is instant. Even if the electrons are in different galaxies... __________________ ~\o/~
 Jun 20th 2019, 08:59 AM #8 Junior Member   Join Date: Jun 2019 Posts: 8 photon distance aha.. this is what I was thinking about.
Jun 20th 2019, 09:18 AM   #9
Senior Member

Join Date: Oct 2017
Location: Glasgow
Posts: 394
 Originally Posted by wavesearcher Yes but light travels at the same speed for all observers which means that from the viewpoint of the light all observers, planets, stars, spaceships, ect are moving towards it at the speed of light. .
Why?

Last edited by benit13; Jun 20th 2019 at 09:30 AM.

Jun 20th 2019, 10:59 AM   #10

Join Date: Apr 2008
Location: On the dance floor, baby!
Posts: 2,730
 Originally Posted by benit13 Why?
One of the main principles of SR is that all observers measure the speed of light to be the same: c. So the relative speed between a photon's frame and any other (slower than c) will be c.

-Dan
__________________
Do not meddle in the affairs of dragons for you are crunchy and taste good with ketchup.

See the forum rules here.

 Tags photon, viewpoint