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A hypothetical subatomic particle that always travels faster than the speed of light.

tach′y·on′ic adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(Nuclear Physics) physics a hypothetical elementary particle capable of travelling faster than the velocity of light
[C20: from tachy- + -on]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˈtæk iˌɒn)

a hypothetical subatomic particle that travels faster than the speed of light.
[1967; < Greek tachý(s) swift]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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In this speculative work dealing with mind and quantum field theory, I subscribe to the notion that elementary fermions (spin-1/2 particles) are massless fields that generate luxons (particles that travel at lightspeed and hence do not experience spacetime) until they interact with the Higgs field whereby through the Feynman Penrose zig-zag picture they acquire both real and imaginary mass. In brief, I subscribe to the idea that the Higgs field can also act as an intermediary field carrying a mindlike quality through its production of the imaginary mass (tachyonic) component when it interacts with fermion fields.
This was deliberately done to account for an initial mass fallacy encountered without any such imaginary mass transfer.
"There is something to these reports rather than some imaginary mass hysteria," says Bill Walker, California director of the EWG.
Symbolical killings, fantastic rides, imaginary mass murders -- all must be brought out.
Fig 2.10, which already illustrates the different types of matter (positive, negative, and imaginary mass), would have been even more powerful had it included one of these other velocities such as c*.
In other words, electric charge is represented as an imaginary mass. For an electrically charged particle, the absolute value of a is a big number.
This means that, given any of the planets of the Solar System, the singulary surface separating our world and the imaginary mass particles world in its gravitational field draws the sphere of the radius about one centimetre around its centre of gravity.
(e) Considering some recent proposals suggesting that neutrino can have imaginary mass [10], the aforementioned imaginary part of solution of BQKGE can also imply that the (supersymmetric-) meson may be composed of neutrino(s).
And then we discuss how Klein-Gordon equation leads to hypothetical imaginary mass. Thereafter we discuss an alternative route for quaternionic modification of Klein-Gordon equation, and implications to meson physics.
Some say that it violates the theory of relativity and the principle of causality, others support the ideas that this hypothesis works for particles with no mass or imaginary mass, in non-locality, through tunneling effect, or in other (extra-) dimension(s)." Kamla John, [9].