Re: energy and mass

From	DJ Delorie <dj@delorie.com>
Newsgroups	sci.physics.relativity, sci.electronics.design
Subject	Re: energy and mass
References	(12 earlier) <xna4xdit4q.fsf@delorie.com> <photons-20260212222813@ram.dialup.fu-berlin.de> <10mlq9b$h4me$1@gwaiyur.mb-net.net> <xn5x81iets.fsf@delorie.com> <1rqgtt6.7u45as1kf8z2sN%nospam@de-ster.demon.nl>
Date	2026-02-13 10:09 -0500
Message-ID	<xnv7g0he9f.fsf@delorie.com> (permalink)

Cross-posted to 2 groups.

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nospam@de-ster.demon.nl (J. J. Lodder) writes:
> As already noted else-thread photons do interact electromagnetically.
> (a purely QED effect)

Ah, ok.

>> (yeah, stupid question maybe, but I still find the answers aka
>> discussions interesting ;)
>
> What is 'stupid' is your need to conceptualise this as a force
> acting on a point particle.

I'm trying to move past my own ignorance ;-)

> The classical equivalent of it are extra, non-linear terms
> in Maxwell's equations.

I remember just barely passing that course in college, so many decades
ago...  TIL there's a version of Maxwell's equations that aren't
dependent on constant time.  Thank you!

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Re: energy and mass Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2026-02-12 14:55 +0100
  Re: energy and mass Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2026-02-12 14:58 +0100
  Re: energy and mass john larkin <jl@glen--canyon.com> - 2026-02-12 07:43 -0800
    Re: energy and mass ram@zedat.fu-berlin.de (Stefan Ram) - 2026-02-12 16:23 +0000
      Re: energy and mass john larkin <jl@glen--canyon.com> - 2026-02-12 08:44 -0800
        Re: energy and mass ram@zedat.fu-berlin.de (Stefan Ram) - 2026-02-12 17:15 +0000
          Re: energy and mass ram@zedat.fu-berlin.de (Stefan Ram) - 2026-02-13 13:45 +0000
        Re: energy and mass Bill Sloman <bill.sloman@ieee.org> - 2026-02-14 05:12 +1100
          Re: energy and mass Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2026-02-13 20:26 +0100
            Re: energy and mass Bill Sloman <bill.sloman@ieee.org> - 2026-02-14 15:56 +1100
              Re: energy and mass Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2026-02-14 14:17 +0100
            Re: energy and mass Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2026-02-14 13:56 +0100
              Re: energy and mass Ross Finlayson <ross.a.finlayson@gmail.com> - 2026-02-14 09:39 -0800
                Re: energy and mass Ross Finlayson <ross.a.finlayson@gmail.com> - 2026-02-14 09:40 -0800
      Re: energy and mass Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2026-02-12 22:08 +0100
        Re: energy and mass Ross Finlayson <ross.a.finlayson@gmail.com> - 2026-02-13 10:07 -0800
      Re: energy and mass Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2026-02-12 22:57 +0100
        Re: energy and mass Ross Finlayson <ross.a.finlayson@gmail.com> - 2026-02-13 10:11 -0800
      Re: energy and mass Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2026-02-13 00:33 +0100
    Re: energy and mass nospam@de-ster.demon.nl (J. J. Lodder) - 2026-02-12 19:39 +0100
      Re: energy and mass john larkin <jl@glen--canyon.com> - 2026-02-12 11:04 -0800
        Re: energy and mass ram@zedat.fu-berlin.de (Stefan Ram) - 2026-02-12 19:22 +0000
          Re: energy and mass ram@zedat.fu-berlin.de (Stefan Ram) - 2026-02-12 20:16 +0000
          Re: energy and mass DJ Delorie <dj@delorie.com> - 2026-02-12 15:50 -0500
            Re: energy and mass ram@zedat.fu-berlin.de (Stefan Ram) - 2026-02-12 21:29 +0000
              Re: energy and mass Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2026-02-13 01:12 +0100
                Re: energy and mass DJ Delorie <dj@delorie.com> - 2026-02-12 20:59 -0500
                Re: energy and mass Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2026-02-13 03:15 +0100
                Re: energy and mass nospam@de-ster.demon.nl (J. J. Lodder) - 2026-02-13 11:27 +0100
                Re: energy and mass DJ Delorie <dj@delorie.com> - 2026-02-13 10:09 -0500
                Re: energy and mass Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2026-02-13 17:39 +0100
                Re: energy and mass nospam@de-ster.demon.nl (J. J. Lodder) - 2026-02-13 23:40 +0100
                Re: energy and mass ram@zedat.fu-berlin.de (Stefan Ram) - 2026-02-13 10:29 +0000
                Re: energy and mass DJ Delorie <dj@delorie.com> - 2026-02-13 10:21 -0500
                Re: energy and mass Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2026-02-13 17:34 +0100
              Re: energy and mass ram@zedat.fu-berlin.de (Stefan Ram) - 2026-02-21 15:24 +0000
            Re: energy and mass nospam@de-ster.demon.nl (J. J. Lodder) - 2026-02-12 23:12 +0100
            Re: energy and mass Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2026-02-12 23:27 +0100
        Re: energy and mass The Starmaker <starmaker@ix.netcom.com> - 2026-02-12 11:28 -0800
        Re: energy and mass nospam@de-ster.demon.nl (J. J. Lodder) - 2026-02-12 22:29 +0100
        Re: energy and mass Bill Sloman <bill.sloman@ieee.org> - 2026-02-14 05:22 +1100
          Re: energy and mass Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2026-02-13 19:58 +0100
            Re: energy and mass Bill Sloman <bill.sloman@ieee.org> - 2026-02-14 07:13 +1100
              Re: energy and mass Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2026-02-14 00:44 +0100
                Re: energy and mass Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2026-02-14 03:52 +0100
                Re: energy and mass nospam@de-ster.demon.nl (J. J. Lodder) - 2026-02-14 21:59 +0100
      Re: energy and mass Ross Finlayson <ross.a.finlayson@gmail.com> - 2026-02-13 09:50 -0800
    Re: energy and mass Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2026-02-12 22:03 +0100
      Re: energy and mass nospam@de-ster.demon.nl (J. J. Lodder) - 2026-02-12 23:12 +0100
        Re: energy and mass Bill Sloman <bill.sloman@ieee.org> - 2026-02-14 05:34 +1100
          Re: energy and mass Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2026-02-13 20:35 +0100
            Re: energy and mass nospam@de-ster.demon.nl (J. J. Lodder) - 2026-02-14 22:57 +0100
          Re: energy and mass nospam@de-ster.demon.nl (J. J. Lodder) - 2026-02-14 21:59 +0100
            Re: energy and mass Bill Sloman <bill.sloman@ieee.org> - 2026-02-15 17:50 +1100
              Re: energy and mass Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2026-02-15 12:47 +0100
                Re: energy and mass Bill Sloman <bill.sloman@ieee.org> - 2026-02-15 23:51 +1100
                Re: energy and mass nospam@de-ster.demon.nl (J. J. Lodder) - 2026-02-15 21:48 +0100
                Re: energy and mass john larkin <jl@glen--canyon.com> - 2026-02-15 08:13 -0800
                Re: energy and mass nospam@de-ster.demon.nl (J. J. Lodder) - 2026-02-15 21:48 +0100
                Re: energy and mass john larkin <jl@glen--canyon.com> - 2026-02-15 13:11 -0800
                Re: energy and mass Seymour Dobrov <ouo@yosdm.ru> - 2026-02-15 19:49 +0000
      Re: energy and mass john larkin <jl@glen--canyon.com> - 2026-02-13 10:04 -0800
      Re: energy and mass Ross Finlayson <ross.a.finlayson@gmail.com> - 2026-02-13 10:05 -0800
    Re: energy and mass Bill Sloman <bill.sloman@ieee.org> - 2026-02-14 05:00 +1100
      Re: energy and mass Ross Finlayson <ross.a.finlayson@gmail.com> - 2026-02-13 10:19 -0800

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