Question

Q. What is hypothetical particals ​

Answer 1

A tachyonic particle is a hypothetical particle that always travels faster than light. Tachyons would also exhibit the unusual property of increasing in speed as their energy decreases, and would require infinite energy to slow down to the speed of light.

Answer 2

Answer:

Hypothetical particles, in physics, are particles whose existence, while yet to be demonstrated, are necessary for consistency within a given physical theory.

If the particle is not found, that theory remains weaker than a comparable theory where all the particles are real

or

Hypothetical particles, in Physics, are particles that have not yet been proved to exist by observation. However they have been or are being hypothesized about because of their occurrence in mathematical analysis in Physics. This is similar to the hypothesizing of the existence of Neptune in Newton’s times. In general, it has been a common trend in Physics in the past decades, that many phenomena are first predicted by mathematical models, and only after that, those phenomena are specifically searched for, and often found.