The rest energy of a particle is defined as:
- ,
where is the speed of light in a vacuum. In general, only differences in energy have physical significance.
The concept of rest energy follows from the Special theory of relativity that leads to Einstein's famous conclusion about equivalence of energy and mass. See background for mass-energy equivalence.
On the other hand, the concept of the equivalent Dirac invariant rest mass may be defined in terms of the self energy corresponding to the product of a geometric matter current and a generalized potential as part of a single definition of mass in a geometric unified theory.
Read more about this topic: Invariant Mass
Famous quotes containing the words rest and/or energy:
“My love—my faith—should instil into your bosom a praeternatural calm. You would rest from care.... You would get better.... And if not, Helen,... if you died—then at least would I clasp your dear hand in death, and willingly—oh, joyfully ... go down with you into the night of the Grave.”
—Edgar Allan Poe (1809–1849)
“Violence among young people ... is an aspect of their desire to create. They don’t know how to use their energy creatively so they do the opposite and destroy.”
—Anthony Burgess (b. 1917)