But it can not be destroyed.

You said:
The two coincident photons could have orthagonal polarization and then they would noy cancel.

Agreed, however this would not serve as an interesting condition.

You said:
Photons that completely cancel do not exist anymore. Photons may cross paths and cancel at a point. But they re-emerge as photons.

If their paths constantly cross due to a slight change in direction due to mutual gravity they would remain in a cloaked form until an outside action helps in the separation.
I would speculate that the cloaked photon pair could now be considered mass if their mass properties remain in tact.

• No mutual gravity in General Relativity - yanniru - August 19, 2003 - 18:16 UTC
  • The point is ... - duordi - August 19, 2003 - 21:33 UTC
    • Photons do not have mass in General Relativity - yanniru - August 20, 2003 - 02:49 UTC
      • We can use the law of conservation of momentum - duordi - August 20, 2003 - 03:33 UTC
        • Nice argument - yanniru - August 20, 2003 - 12:57 UTC
          • Speed of light - davidoakley - August 21, 2003 - 08:20 UTC
            • This takes alot of faith in physics - yanniru - August 21, 2003 - 12:31 UTC
              • Paper on massive photons - yanniru - August 21, 2003 - 16:45 UTC
              • Paper on massless electrons - yanniru - August 27, 2003 - 12:27 UTC
• Sorry, typing to fast? - duordi - August 19, 2003 - 21:24 UTC