(meta material) is a material that gains its properties from its structure rather than directly from its composition. This term is particularly used when the material has properties not found in naturally-formed substances. Metamaterials are of particular importance in electromagnetism (especially optics and photonics), where metamaterials are promising for a variety of optical and microwave applications, such as new types of beam steerers, modulators, band-pass filters, lenses, microwave couplers, and antenna radomes.
-Wikipedia on Metamaterials
Can Tachyons be used for communication, Yes. The article in question can't really be considered accurate when dealing with issues of time travel because of the slavish devotion to avoiding the weirdness of causality.
Wikipedia article used as proof said:Tachyons are prevented from violating causality by the Feinberg reinterpretation principle, which states that a negative-energy tachyon sent back in time in an attempt to violate causality can always be reinterpreted as a positive-energy tachyon traveling forward in time.
This is because observers cannot distinguish between the emission and absorption of tachyons. For a tachyon there is no distinction between the processes of emission and absorption, since there always exists a sub-light velocity reference frame shift that alters the temporal direction of the tachyon's world-line, which is not true for bradyons or photons.
The attempt to detect a tachyon from the future (and violate causality) actually creates the same tachyon and sends it forward in time (which is causal). A tachyon detector will seem to register tachyons in every possible detection model; in reality the tachyon "detector" is spontaneously emitting tachyons.
The effect of the reinterpretation principle on any tachyon "detector" is that any incoming tachyonic message would be lost against the tachyon background noise, which is an inevitable accompaniment of the uncontrollable emission.
The counter intuitive conclusion is that tachyons (if they existed) could be used to transmit energy-momentum, but they can't be used for communication. Thus there is no need to fall back on some quantum field theory form of the Novikov self-consistency principle to preserve causality.
We reserve the right to deny unnecessary, redundant tech like new "Total Annihilation" weapons.
We reserve the right to deny unnecessary, redundant tech like new "Total Annihilation" weapons.
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