Invariant quantities for antimatter

[actionintegral]

Since antiparticles have reversed proper time, can I conclude that all invariants are reversed for antiparticles?

[actionintegral]

a tumbleweed rolls by...

[pmb_phy]

Since antiparticles have reversed proper time,..What exactly do you mean by this? I can't see anything which would imply such an assertion. :confused:

There is really no such thing as an "anti-particle." The meaning of the term "anti-particle" refers to opposite properties of a particle. E.g. one could define the term "neutron" to refer to what we normally call a 'neutron' and then refer to the 'anti-neutron' as "neutron." Thus what we call the "anti-particle" refers merely the opposite of a given particle. I.e. the anti-particle of the anti-neutron is the neutron.

The term "reversed proper time" makes no sense. The phrase "proper time" refers to the time between two events as the time as measured by a clock which travels on a specified worldline between the two events. This is true of all tardyon's (i.e. particles which travel at v < c).

Perhaps you're confusing this with tachyons??

Pete

[Gokul43201]

No, I think the OP is confused about CPT symmetry, or something along those lines - maybe even just the definition of the antiparticle of a given particle.

http://en.wikipedia.org/wiki/Antiparticle

[actionintegral]

[QUOTE=Gokul43201]No, I think the OP is confused about CPT symmetry, or something along those lines - maybe even just the definition of the antiparticle of a given particle.
QUOTE]

Thank you for pointing out my confusion. Now maybe I can ask my question more intelligently.

I am referring specifically to Feynman's theory of positrons - that positrons they move backwards in time. Now that statement only makes sense if I am referring to the proper time of the positron. I also read that positrons have negative energy which I assume means negative rest mass.

I was referred to CPT symmetry but I am still reading about that.

[pmb_phy]

I am referring specifically to Feynman's theory of positrons - that positrons they move backwards in time. Now that statement only makes sense if I am referring to the proper time of the positron.I don't think Feynman said that positrons move back in time. I believe what he said was that one could view a positron as an electron which is moving backwards in time.


Pete

[actionintegral]

I don't think Feynman said that positrons move back in time.
Pete

Yes, I think I made an oversimplification in my mind. Let's continue this
after I do some more learning.

[actionintegral]

There is an old paper by Bondi about negative mass. Since I only have negative money, can someone send it to me?

[pmb_phy]

There is an old paper by Bondi about negative mass. Since I only have negative money, can someone send it to me?Sure. PM your email address to me and I'll send it to you within a day or so (since I'll have to find it and then scan it and convert it to PDF).

Pete

[actionintegral]

Sure. PM your email address to me and I'll send it to you within a day or so (since I'll have to find it and then scan it and convert it to PDF).
Pete

Please send it to actionintegral@yahoo.com

Much, Much obliged!