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We know that the light from distant stars takes a very long time to reach the Earth," says Dr. Akhlesh Lakhtakia, distinguished professor of engineering science and mechanics, Penn State. "But, taking into account the distance a star will have moved while that light travels, we still may not be able to accurately locate the star.Ó
Negative phase velocity media or materials with negative refractive index may be responsible for this locational uncertainty. Recently, materials researchers at the University of California San Diego, working with micro and nano materials, developed a metamaterial that had a negative refractive index for microwaves, proving that negative phase materials could exist at least in the microwave part of the electromagnetic spectrum. Their requirements for this material were that both the relative permittivity, a measure of the charge separation in a material, and the relative permeability, a measure of how electrons loop in materials, of a substance must be less than zero.
While the implications for negative phase velocity media in the nano world are the creation of a perfect lens, a lens with no distortion with applications for optical transmission devices, CDs, DVDs, microwave systems, etc., in the universe at large, these media can disguise the location of a star, according to the researchers.
Lakhtakia and Tom. G. Mackay, lecturer in Mathematics, University of Edinburgh decided to look at why the permittivity and permeability had to be less than zero. They found that one or both permeability and permittivity could be less than zero and negative phase velocity would occur. They then found that both could be greater than zero and a negative index of refraction would occur but only when special relativity came into play.
What they found was that it depends on the state of the observer whether any particular media at any time has negative or positive index of refraction. The relative velocity of the observer changes the index of any material.
"Light coming off a stellar object passes through many different regions of space filled with different media and is affected by different gravitational fields," says Lakhtakia. "When we finally see it, we cannot really know where it originated."
Originally posted by cabuki
wow. S&F for you. That is pretty nuts!
its like looking though a house of mirrors,
Originally posted by cabuki
reply to post by XPLodER
yea, i was just about to say...wtf! Can you elaborate a little more on what this would actually mean? What changes would it bring to what we know now or what would it effect? Just trying to get more insight
Originally posted by cabuki
reply to post by XPLodER
yea, i was just about to say...wtf! Can you elaborate a little more on what this would actually mean? What changes would it bring to what we know now or what would it effect? Just trying to get more insight
First I did the derivations with the observer moving and the energy source stationary," says Lakhtakia. " Then Mackay did the derivations with the observer stationary and the light source moving."
What they found was that it depends on the state of the observer whether any particular media at any time has negative or positive index of refraction. The relative velocity of the observer changes the index of any material.
The researchers looked at transmission through space, where high velocities are common.
"First I did the derivations with the observer moving and the energy source stationary," says Lakhtakia. " Then Mackay did the derivations with the observer stationary and the light source moving."
Originally posted by stirling
This should be a simple correction factor if so.....I think it is indicative of much more than that.
Just moving in a certain direction for an extra 10000yrs would correct fairly simply if we know he direction.
It is not knowing which direction the distant star may be going that really monkey wrenches it.
It makes me wonder if the alien concept of light being a state of field, and not moving per se is maybe more to the point......