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Feynman Diagram: Electron changes direction but does not emit a photon?



 
 
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  #1  
Old June 20th 07 posted to sci.physics.relativity
guskz@hotmail.com
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Posts: 2,771
Default Feynman Diagram: Electron changes direction but does not emit a photon?


They say a change of direction causes the electron to perpendicularly
emit radiation but:

Feynman Diagram: Electron changes direction but does not emit a
photon?

The cause of the direction change was a single photon being absorbed
but none the less there is no radiation emission due to the change of
direction.


http://www-hep2.fzu.cz/~staroba/www....ritannica.html

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  #2  
Old June 20th 07 posted to sci.physics.relativity
Eric Gisse
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Posts: 17,705
Default Feynman Diagram: Electron changes direction but does not emit a photon?

On Jun 20, 12:09 am, " wrote:

[snip]

NO.

You do not even understand classical mechanics. Stay the **** away
from quantum field theory.

  #3  
Old June 20th 07 posted to sci.physics.relativity
Sue...
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Posts: 9,404
Default Feynman Diagram: Electron changes direction but does not emit a photon?

On Jun 20, 5:09 am, " wrote:
They say a change of direction causes the electron to perpendicularly
emit radiation but:

Feynman Diagram: Electron changes direction but does not emit a
photon?

The cause of the direction change was a single photon being absorbed
but none the less there is no radiation emission due to the change of
direction.

http://www-hep2.fzu.cz/~staroba/www....ritannica.html


Don't even share the same building with a copy of
Feynman's "QED" until you learn to make low frequency
light with a charged comb and a pithball.

http://farside.ph.utexas.edu/teaching.html
http://web.mit.edu/8.02t/www/802TEAL...ight/index.htm
http://www.ee.surrey.ac.uk/Personal/.../antennas.html

Sue...

  #4  
Old June 20th 07 posted to sci.physics.relativity
Randy Poe
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Posts: 8,017
Default Feynman Diagram: Electron changes direction but does not emit a photon?

On Jun 20, 4:09 am, " wrote:
They say a change of direction causes the electron to perpendicularly
emit radiation


In a magnetic field. I've omitted that qualifier in the past
but I believe it's required for synchrotron radiation.

- Randy

  #5  
Old June 20th 07 posted to sci.physics.relativity
guskz@hotmail.com
external usenet poster
 
Posts: 2,771
Default Feynman Diagram: Electron changes direction but does not emit a photon?

On Jun 20, 4:09 am, " wrote:
They say a change of direction causes the electron to perpendicularly
emit radiation but:

Feynman Diagram: Electron changes direction but does not emit a
photon?

The cause of the direction change was a single photon being absorbed
but none the less there is no radiation emission due to the change of
direction.

http://www-hep2.fzu.cz/~staroba/www....ritannica.html


?? no replied saying why the Feynman Diagram doesn't show an emitted
photon due to the change of direction?

I believe no one has the answer and is trying to elude the question
for it tampers with their belief and understanding.




  #6  
Old June 20th 07 posted to sci.physics.relativity
guskz@hotmail.com
external usenet poster
 
Posts: 2,771
Default Feynman Diagram: Electron changes direction but does not emit a photon?

On Jun 20, 5:01 am, "Sue..." wrote:
On Jun 20, 5:09 am, " wrote:

They say a change of direction causes the electron to perpendicularly
emit radiation but:


Feynman Diagram: Electron changes direction but does not emit a
photon?


The cause of the direction change was a single photon being absorbed
but none the less there is no radiation emission due to the change of
direction.


http://www-hep2.fzu.cz/~staroba/www....ritannica.html


Don't even share the same building with a copy of
Feynman's "QED"



Big wig deal, it's a very small diagram:

http://www-hep2.fzu.cz/~staroba/www....age_id-571.gif

QUOTE:
"(SeeFigure B.) In this diagram, a proton (p+) emits a photon at V1,
and this photon is then absorbed at some slightly later time by an
electron at V2. The emission of the photon causesthe proton to recoil
in space, while the absorption of the photon's energy and momentum by
the electron causes a comparable deflection in the electron's path.
The result of this interaction is for both particles to move away from
each other in space"

There's a change of direction (for both the photon and electron) but
not photon emission.

And no you can't say a deflection from a photon is different from a
deflection from a magnet.

Sue...



  #7  
Old June 20th 07 posted to sci.physics.relativity
guskz@hotmail.com
external usenet poster
 
Posts: 2,771
Default Feynman Diagram: Electron changes direction but does not emit a photon?

On Jun 20, 4:51 pm, " wrote:
On Jun 20, 4:09 am, " wrote:

They say a change of direction causes the electron to perpendicularly
emit radiation but:


Feynman Diagram: Electron changes direction but does not emit a
photon?


The cause of the direction change was a single photon being absorbed
but none the less there is no radiation emission due to the change of
direction.


http://www-hep2.fzu.cz/~staroba/www....ritannica.html


?? no replied saying why the Feynman Diagram doesn't show an emitted
photon due to the change of direction?

I believe no one has the answer and is trying to elude the question
for it tampers with their belief and understanding.


http://www-hep2.fzu.cz/~staroba/www....age_id-571.gif

QUOTE:
"(SeeFigure B.) In this diagram, a proton (p+) emits a photon at V1,
and this photon is then absorbed at some slightly later time by an
electron at V2. The emission of the photon causesthe proton to recoil
in space, while the absorption of the photon's energy and momentum by
the electron causes a comparable deflection in the electron's path.
The result of this interaction is for both particles to move away from
each other in space"

There's a change of direction (for both the photon and electron) but
not photon emission.

And no you can't say a deflection from a photon is different from a
deflection from a magnet.

  #8  
Old June 20th 07 posted to sci.physics.relativity
Sue...
external usenet poster
 
Posts: 9,404
Default Feynman Diagram: Electron changes direction but does not emit a photon?

On Jun 20, 5:55 pm, " wrote:
On Jun 20, 5:01 am, "Sue..." wrote:





On Jun 20, 5:09 am, " wrote:


They say a change of direction causes the electron to perpendicularly
emit radiation but:


Feynman Diagram: Electron changes direction but does not emit a
photon?


The cause of the direction change was a single photon being absorbed
but none the less there is no radiation emission due to the change of
direction.


http://www-hep2.fzu.cz/~staroba/www....ritannica.html


Don't even share the same building with a copy of
Feynman's "QED"


Big wig deal, it's a very small diagram:

http://www-hep2.fzu.cz/~staroba/www....age_id-571.gif

QUOTE:
"(SeeFigure B.) In this diagram, a proton (p+) emits a photon at V1,
and this photon is then absorbed at some slightly later time by an
electron at V2. The emission of the photon causesthe proton to recoil
in space, while the absorption of the photon's energy and momentum by
the electron causes a comparable deflection in the electron's path.
The result of this interaction is for both particles to move away from
each other in space"

There's a change of direction (for both the photon and electron) but
not photon emission.

And no you can't say a deflection from a photon is different from a
deflection from a magnet.


I certainly can say that because I have a picture of it.

http://teachers.web.cern.ch/teachers...ch/flight.html
The divergence is the creation, the spiral is the magnet.

Do you know the difference in a photon and radiation?

If not, learn some physics:

http://farside.ph.utexas.edu/teaching.html
http://web.mit.edu/8.02t/www/802TEAL...ight/index.htm
http://www.ee.surrey.ac.uk/Personal/.../antennas.html

Sue...

Leave this alone 'till you can make light with a comb and pith ball.
http://www.egglescliffe.org.uk/physi...ts/parts1.html





  #9  
Old June 21st 07 posted to sci.physics.relativity
guskz@hotmail.com
external usenet poster
 
Posts: 2,771
Default Feynman Diagram: Electron changes direction but does not emit a photon?

On Jun 20, 4:31 am, Eric Gisse wrote:
On Jun 20, 12:09 am, " wrote:

[snip]

NO.

You do not even understand classical mechanics. Stay the **** away
from quantum field theory.


Particle mechanics in units of quanta versus wave mechanics in units
of quanta.

  #10  
Old June 21st 07 posted to sci.physics.relativity
Ben Rudiak-Gould
external usenet poster
 
Posts: 1,116
Default Feynman Diagram: Electron changes direction but does not emita photon?

wrote:
http://www-hep2.fzu.cz/~staroba/www....age_id-571.gif

QUOTE:
"(SeeFigure B.) In this diagram, a proton (p+) emits a photon at V1,
and this photon is then absorbed at some slightly later time by an
electron at V2. The emission of the photon causesthe proton to recoil
in space, while the absorption of the photon's energy and momentum by
the electron causes a comparable deflection in the electron's path.
The result of this interaction is for both particles to move away from
each other in space"


That description is wrong, and the image is also wrong in adding "space" and
"time" axes to the diagram. Feynman diagrams are not spacetime diagrams,
they are just drawings of graphs (the computer science kind of graph).
There's a vestigial notion of time ordering in the distinction between
ingoing and outgoing particles, but there's no notion of space at all.
Electrons can't change direction in a Feynman diagram.

-- Ben
 




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