Path: csiph.com!weretis.net!feeder9.news.weretis.net!border-1.nntp.ord.giganews.com!nntp.giganews.com!local-3.nntp.ord.giganews.com!Xl.tags.giganews.com!local-1.nntp.ord.giganews.com!news.giganews.com.POSTED!not-for-mail NNTP-Posting-Date: Fri, 13 Feb 2026 01:59:18 +0000 From: DJ Delorie Newsgroups: sci.physics.relativity,sci.electronics.design Subject: Re: energy and mass References: <8e7kokl9hospneh83uskr9otk6kquvvfn8@4ax.com> <10mf1bs$3i2mv$1@dont-email.me> <10mg425$3v2e1$1@dont-email.me> <10mkm4g$fm1r$1@gwaiyur.mb-net.net> <1rqfmxt.jp4fr16u1qtvN%nospam@de-ster.demon.nl> <10mlq9b$h4me$1@gwaiyur.mb-net.net> Date: Thu, 12 Feb 2026 20:59:11 -0500 Message-ID: User-Agent: Gnus/5.13 (Gnus v5.13) Cancel-Lock: sha1:0MvTA/DFFQMQHIky6q2P0P2p0D0= MIME-Version: 1.0 Content-Type: text/plain Lines: 24 X-Usenet-Provider: http://www.giganews.com X-Trace: sv3-1zWQZYlgXiSSA/+gS6Of2nes4BSxcglkGBnoa5axH1WY9WK4WOWbFCZpsF41e91/o+O8ssooeOLcsa0!2rUG3yPwg3oI3ZqSkKHLPfRWLIF0NUrFwkcy4qJAOOKSGDVoBw== X-Complaints-To: abuse@giganews.com X-DMCA-Notifications: http://www.giganews.com/info/dmca.html X-Abuse-and-DMCA-Info: Please be sure to forward a copy of ALL headers X-Abuse-and-DMCA-Info: Otherwise we will be unable to process your complaint properly X-Postfilter: 1.3.40 Xref: csiph.com sci.physics.relativity:668665 sci.electronics.design:740364 So... a photon moving at speed of light has some energy-mass-whatever-equivalent, which is sufficient to warp spacetime. That change may cause other photons' paths to "bend" as if gravity were a force, regardless of time effects, because it's not a force, it's a shape. I think I got that part [*]. I wonder, though, if there were some non-spacetime actual "force" between photons (I realize there isn't, but imagine one for a moment). If said force obeyed the usual F=ma, *now* would time dilation come into play wrt photons? Two photons travelling next to each other, from their point of view (or any other), how would that force evolve itself over "time" ? (yeah, stupid question maybe, but I still find the answers aka discussions interesting ;) [*] except if photons move at the speed of light, and "gravity" does too, do photons create gravitational shock waves as they travel? Or does the distortion just travel happily along with the photon? Or just behind it? How could we find out?