Tachyons are postulated particles that travel faster than the speed of light. (The word tachyon is derived from the Greek word tachus, which means “speedy.”) They were first seriously proposed and investigated in the 1960s. Use what we have learned thus far in this chapter and discuss several properties that tachyons might have

Tachyons are postulated particles that travel faster than the speed of light. (The word tachyon is derived from the Greek word tachus, which means “speedy.”) They were first seriously proposed and investigated in the 1960s. Use what we have learned thus far in this chapter and discuss several properties that tachyons might have