Can particles travel faster than speed of light? If so, would the concept of "time" still remain the same?
Are there particles with greater than zero rest mass (that can be accelerated to a speed = or > than that of a source of EMR)?
When we cannot physically measure the speed of light (speed in a vacuum), what exactly we mean by "time"?
What are we expected to understand from the concepts of "Time Dilation" (Time appears to run slower) and "Length Contraction" (Distance appears to get smaller) - as we move closer to the speed of light?
The tachyon is not existed in experiment,but the physical properties is existed,like spins-interaction!
Dear Suresh
There is "theoretical speculation" that particles can travel faster than the speed of light, but no repeatable experiment ever confirmed such a possibility.
The only known stable particle with the smallest rest mass ever confirmed is the electron, and it can be accelerated to velocities very close to the speed of light, but this velocity is an asymptotic velocity limit for the electron, meaning that it can not really reach it. It remains forever out of reach whatever amount of energy you provide the electron with. This is confirmed by all experiments ever carried out in high energy accelerators.
The reason is mechanically explained by the fact that its momentum energy would need to become equal to the transversely oriented energy of its rest mass plus the also transversely oriented energy of its magnetic field increment for "c" to be reached. This is impossible, because by structure, the energy of its momentum is always equal to the energy of its velocity related magnetic field increment to start with. Since the energy of its rest mass always come in addition to this magnetic field energy increment, then "c" cannot be reached:
https://www.gsjournal.net/Science-Journals/Research%20Papers-Relativity%20Theory/Download/3197
The speed of light has constantly been measured, and we know for certain that it moves exactly at "c" in vacuum. Laser ranging techniques and experiments carried out between the Moon and the Earth confirmed this velocity, and also the confirmable and measured consistent time delays in communicating with satellites and deep space crafts also confirms this constant velocity.
Time dilation is a theoretical concept of SR never confirmed in physical reality:
https://www.omicsonline.org/open-access/gravitation-quantum-mechanics-and-the-least-action-electromagneticequilibrium-states-2329-6542-1000152.pdf
Best Regards, André
Dear Suresh,
"Can particles travel faster than speed of light? If so, would the concept of "time" still remain the same?"
-No, nothing can travel faster than light
"Are there particles with greater than zero rest mass (that can be accelerated to a speed = or > than that of a source of EMR)?"
-There are theories that affirm that, yes. But in my opinion in the real world it makes no sense
"When we cannot physically measure the speed of light (speed in a vacuum), what exactly we mean by "time"?"
-Our conception of time must change if you look in detail, time would be "anything" that advanced without affecting our usual 3 dimensions
"What are we expected to understand from the concepts of "Time Dilation" (Time appears to run slower) and "Speed Contraction" (Distance appears to get smaller) - as we move closer to the speed of light?"
-I suppose you mean "Time dilation" and "Lenght contration", precisely is that. Is neither a mathematical artifice nor an optical effect, it is a real phenomenon
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