Are The "Takhyons" Really Travel With More Than The Velocity Of Light ?

Question

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Answer 1

You must be kidding
Actuly a tachyon (from the Greek ταχύς takhús, meaning "swift") is any hypothetical particle that travels at velocity higher then the speed of light .

Please not it is hypothetical.

Answer 2

Tachyons are hypothetical particles that travel faster than the speed of light, but still behave the relativistic laws.

Here's why:

It is a particle with space-like four momentum, which means its energy and momentum are real, but its rest mass is imaginary. As a result of this, its speed actually increases as it loses energy. This is a result of special relativity because it has a negative squared mass.

For example, the energy with rest mass m of a particle is given by:

E = mc^2/sqrt(1 - v^2/c^2)

(This is the relativistic energy)

Since m is imaginary, the denominator must also be imaginary, because a pure imaginary number divided by a pure imaginary number is real. Therefore, the square root term must be negative, which means v must be larger than c.

This means a tachyon cannot travel at or slower than the speed of light, just like objects with non-imaginary masses cannot travel at or faster than the speed of light.

They are only hypothetical right now, and do pose a problem with causality, because causality can be broken when an object breaches the speed of light.

Answer 3

There is no experimental evidence that confirms the existance of tachyons. In order for an object to have a velocity greater than the speed of light, it's mass must be imaginary. The equation which relates relativistic mass to rest mass is

Relativistic Mass = (Rest Mass)(1-(v/c)^2)^(-1/2)

If v > c, then a negative number occurs under the square root and the result is an imaginary number.

Answer 4

Yes, If they existed.
A superluminal phenomenon is a frame of reference traveling with a speed greater than the speed of light c. There is a putative class of particles dubbed tachyons which are able to travel faster than light. Faster-than-light phenomena violate the usual understanding of the "flow" of time, a state of affairs which is known as the causality problem (and also called the "Shalimar Treaty").

It should be noted that while Einstein's theory of special relativity prevents (real) mass, energy, or information from traveling faster than the speed of light c (Lorentz et al. 1952, Brillouin and Sommerfeld 1960, Born and Wolf 1999, Landau and Lifschitz 1997), there is nothing preventing "apparent" motion faster than c (or, in fact, with negative speeds, implying arrival at a destination before leaving the origin). For example, the phase velocity and group velocity of a wave may exceed the speed of light, but in such cases, no energy or information actually travels faster than c. Experiments showing group velocities greater than c include that of Wang et al. (2000), who produced a laser pulse in atomic cesium gas with a group velocity of . In each case, the observed superluminal propagation is not at odds with causality, and is instead a consequence of classical interference between its constituent frequency components in a region of anomalous dispersion (Wang et al. 2000).

Answer 5

The previous post is correct. They (tachyons) are indeed theoretical, but as far as I know they came from Einstein's total energy equation:

E^2 = c^2p^2 + m_o^2c^4

When solved you get two solutions for energy (E). One is positive, and the other negative. Negative energy doesn't make sense, but someone played around with the consequences of this concept and apparently found out that it gives rise to particles that only travel faster than the speed of light.

Kind of makes snese givent hat using the (usual) positive solution for the energy gives particles that only travel slower than the speed of light.

I'm not sure if this accounting is purely anecdotical, but it's worth looking into if you are that curious. You seemed like you were so I thouht I'd pass this along your way.

:)

Enjoy.

Answer 6

Tachyons are defined to be particles travelling faster than the speed of light in a vacuum.
Tardyons are particles travelling at the speed of light or slower.

Under certain conditions tardyons can travel faster than light, but these conditions are not in a vacuum.

Answer 7

Like most science its based on theories derived from mathematical equations. Theories show they travel faster than light and they might just be real or not. Many particles and even elements were first described in theories before being physically discovered