According to current understanding in physics, tachyons are hypothetical particles that are theorized to always travel faster than the speed of light. If tachyons were to exist, they would have several unusual properties, including the ability to travel backward in time.
However, it's important to note that tachyons are purely speculative at this point, and there is no experimental evidence to support their existence. The concept of tachyons arises from certain mathematical solutions within theoretical physics, but they have not been observed or detected in experiments.
Due to the hypothetical nature of tachyons, it is challenging to discuss their properties and behavior with certainty. Since they are theorized to always move faster than light, it is not known if they can be slowed down or brought to rest using conventional means. Theoretical models suggest that tachyons would have an imaginary mass, which introduces complex and uncertain consequences for their behavior.
Regarding the detection of tachyons, it is purely speculative since they have not been observed. The hypothetical properties of tachyons make their detection challenging. If tachyons were to exist, their detection would likely require innovative experimental approaches and advanced technologies that are currently beyond our capabilities.
It's important to emphasize that tachyons exist within the realm of theoretical physics and are subjects of ongoing research and investigation. However, until experimental evidence is obtained, their existence and properties remain purely speculative.