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NEOWatcher
2012-Oct-09, 04:32 PM
I ran across this story today...
Einstein's math suggests faster-than-light travel, say scientists (http://www.msnbc.msn.com/id/49343856/ns/technology_and_science-science/#__utma=14933801.20788058.1349108118.1349723944.13 49798756.18&__utmb=14933801.3.10.1349798756&__utmc=14933801&__utmx=-&__utmz=14933801.1349266341.7.2.utmcsr=cosmoquest.o rg|utmccn=(referral)|utmcmd=referral|utmcct=/forum/showthread.php/55896-Random-UFOs-in-the-News&__utmv=14933801.|8=Earned%20By=msnbc%7Ccover=1^12= Landing%20Content=Mixed=1^13=Landing%20Hostname=ww w.nbcnews.com=1^30=Visit%20Type%20to%20Content=Ear ned%20to%20Mixed=1&__utmk=83382934)

What I wonder is what is new. I always thought SR always allowed for FTL but not to cross the threshhold.
Isn't that where the idea of tachyons come from?

The graph does look pretty though.

I tried to search for an answer, and ran across
this version from Phys.org (http://phys.org/news/2012-10-physicists-special-relativity.html)
I was rather dismayed at thier equating it with breaking the sound barrier.

Noclevername
2012-Oct-09, 11:34 PM
It sounds like it's neither new nor a loophole-- just a way for an FTL "enthusiast" to add some math to his speculations. If someone found out it's actually possible to reach that speed, even hypothetically, then it would be a loophole.

Jens
2012-Oct-10, 12:09 AM
It seems kind of strange, because tachyons as I understand it are predicated exactly on that idea, that you can pop the numbers in and get an object going faster than the speed of light but going backwards in time and all that. And there are two strange things in the article. One is that it says that relativity breaks down as you "approach the speed of light," which is clearly false as far as I know. The other is the idea of Hill (a mathematician) that it might be possible to "break the barrier" as with sound. He doesn't seem to understand the physical implications of what he's saying, that you can never actually reach the speed of light, and hence cannot get into the world beyond it.

undidly
2012-Oct-10, 10:04 AM
Over what distance does light accelerate to reach 300,000,000 m/sec?
No distance at all.
Light swims away from the source at a speed determined by the medium though which it travels.

Tachyons may be "born" already traveling at any speed.

Tog
2012-Oct-10, 12:04 PM
I remember hearing this from someone who was not a science person back around 1993. Nothing says you can't go faster than light only that you can't reach a speed faster than light. If something was traveling FTL, it would have the same issues trying to slow down. No idea where he might have heard it, but it was definitely 1993 or 1994.

Ara Pacis
2012-Oct-11, 08:21 AM
I read about this earlier. I recall tachyons were based on the idea back in the late 80s or early 90s. I think the new part might be the calculation that something born faster than c being accelerated to even faster speeds would reach zero mass at infinite speed.

I wonder, if there were FTL particles with mass, would we experience their gravity, and how?

grapes
2012-Oct-11, 01:18 PM
I read about this earlier. I recall tachyons were based on the idea back in the late 80s or early 90s. In the early 70s, the physics department softball team was called the Tachyons. They were pretty slow, actually.

Ara Pacis
2012-Oct-11, 10:58 PM
In the early 70s, the physics department softball team was called the Tachyons. They were pretty slow, actually.

Stoopid Discover Magazine told me it was "news".

grapes
2012-Oct-12, 11:14 AM
Here is the online abstract: http://rspa.royalsocietypublishing.org/content/early/2012/09/25/rspa.2012.0340.abstract

Have they just duplicated the stuff on tachyons? The manuscript was submitted Jun 8, plenty of time for review.