Faster then light

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androbot2084
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19 Oct 2011, 11:26 am

With relativistic time dilation virtual faster than light speeds can be achieved.

ruveyn
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19 Oct 2011, 11:45 am

androbot2084 wrote:

With relativistic time dilation virtual faster than light speeds can be achieved.

It requires an infinite amount of energy to move a non-zero mass from a less than light speed to the speed of light. There is nothing in relativity theory that forbids some non-zero mass to be moving faster than light but it cannot be slowed down to below light speed. That would require infinite energy. No non-zero mass body can move -at- light speed. A photon can do this since it has zero rest mass.

If the latest finding on neutrinos is verified (yet to be done) it may require a modification to special relativity or its replacement.

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androbot2084
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19 Oct 2011, 11:56 am

At the speed of light time stops. Since it no longer takes any time at all to travel to anywhere in the universe this would then be the equivalent of achieving an infinite speed.

ruveyn
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19 Oct 2011, 12:21 pm

androbot2084 wrote:

At the speed of light time stops. Since it no longer takes any time at all to travel to anywhere in the universe this would then be the equivalent of achieving an infinite speed.

It is no such thing. It still takes light from Alpha Centuri four years to reach us. Just because a trip in a light speed vehicle seems like no time at all (proper time in the vehicle would indicate an instantaneous trip) does not mean it took no time at all. It depends on which frame of reference you are using to reckon the duration.

In any case it is all moot. The fasted vehicle capable of carrying humans has gone at 30,000 mph. That is a snail's pace relative to light speed. Furthermore the energy requirements are such that it is unlikely that any human carrying vehicle weight down by its life support systems will ever go fast than a tenth of light speed. At that speed the time dilation is almost negligible.

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Beauty_pact
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18 Nov 2011, 6:49 pm

The experiment has successfully been repeated.

http://blogs.nature.com/news/2011/11/ne ... ms_fa.html

ruveyn
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18 Nov 2011, 8:42 pm

Beauty_pact wrote:

The experiment has successfully been repeated.

http://blogs.nature.com/news/2011/11/ne ... ms_fa.html

By the same team. The possibility of observer bias has not been eliminated.

The experiment should be tried by an independent team in another location (if feasible) and perhaps using a different experimental design. If the results hold then, we have
Something Interesting. It is out of such results that new physics comes.

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19 Nov 2011, 12:20 am

ruveyn wrote:

Beauty_pact wrote:

The experiment has successfully been repeated.

http://blogs.nature.com/news/2011/11/ne ... ms_fa.html

By the same team. The possibility of observer bias has not been eliminated.

Also, according to the article, they still haven't fixed the GPS timing issue.

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DeaconBlues
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19 Nov 2011, 12:38 am

Ancalagon wrote:

ruveyn wrote:

Beauty_pact wrote:

The experiment has successfully been repeated.

http://blogs.nature.com/news/2011/11/ne ... ms_fa.html

By the same team. The possibility of observer bias has not been eliminated.

Also, according to the article, they still haven't fixed the GPS timing issue.

If indeed there are any such issues - many researchers don't believe there are. Fermilab should be ready to try reproducing this result in early 2012 sometime, they say - right now they're recalibrating their equipment to detect such small time-frames.

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rdos
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19 Nov 2011, 2:53 am

I think it is possible for non-electromagenetic stuff to travel faster than light, and the weight increase of particles in accelerators is only due to a massive build-up of electromagnetic energy as they accelerate the particle. OTOH, we cannot use electromagnetic fields to accelerate particles above the speed of light for obvious reasons.

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19 Nov 2011, 6:45 am

rdos wrote:

A simple shadow can move accross a surface faster than the speed of light, as can a point of light. Many quantum phenomena seem to move faster than the speed of light also.

These "things" can be taken as moving faster than light because they are otherwise erroneous abstract concepts. For example, shadows do not exist, but are interpreted as "being" there as an absence of the same level of lighting as of the surrounding area. An equivalent mistaken thermodynamic model is of a colder body "radiating coldness" to a warmer body. An old lampoon joke is the "Dark-Bulb", that can reduce the illumination in a room, by "radiating" darkness from the bulb.

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ruveyn
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19 Nov 2011, 10:14 am

Tadzio wrote:

An old lampoon joke is the "Dark-Bulb", that can reduce the illumination in a room, by "radiating" darkness from the bulb.

Tadzio

I keep a flashdark right next to my flashlight.

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Jono
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19 Nov 2011, 8:06 pm

rdos wrote:

Nonsense, where do you get this idea that special relativistic effects are due to electromagnetic fields and if that were the case then how do you explain the Michealson-Morley experiment. There is no ether, so the Earth was not moving through anything when the Michaelson-Morley experiment was done.

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19 Nov 2011, 8:10 pm

Tadzio wrote:

rdos wrote:

A simple shadow can move accross a surface faster than the speed of light, as can a point of light. Many quantum phenomena seem to move faster than the speed of light also.

A shadow is not a massive object so there are no physical laws broken by shadows moving faster than light. Also no, quantum entanglement cannot be used to send information faster than light. There is no violation of anything in special relativity with either of those things.

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19 Nov 2011, 9:21 pm

Jono wrote:

Tadzio wrote:

rdos wrote:

A simple shadow can move accross a surface faster than the speed of light, as can a point of light. Many quantum phenomena seem to move faster than the speed of light also.

i was under the impression that you can in fact send information using quantum entanglement but not actual matter,
(send is a misleading term as nothing goes anywhere)

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19 Nov 2011, 9:42 pm

I wonder... Do Justmax theory could explain that? http://www.wrongplanet.net/postt112623.html

http://www.keepandshare.com/doc/976477/temporalinteraction-5k?da=y

Do the low mass of neutrino simply "extended' their causality?

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Telefunkenfan
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19 Nov 2011, 10:37 pm

androbot2084 wrote:

With relativistic time dilation virtual faster than light speeds can be achieved.

pardon this request but can you prove or rather elaborate this mathematically?
I can't say I can visualize that all too well.

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