Timeline for What if singularities are massless?
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| Aug 9, 2016 at 19:27 | comment | added | dmckee --- ex-moderator kitten | @FaraazAhmad In the usual, human-scaled units there is a factor of $c^2$ to fix up the units. But that tells you about our system of units, rather than telling you about physics, and many working physicist use a system of units where you can drop the factor to simplify the way we write equations. Compare $m^2 = E^2 - \vec{p}^2$ to $(mc^2)^2 = E^2 - (\vec{p}c)^2$. | |
| Aug 9, 2016 at 19:07 | comment | added | Faraaz Ahmad | You mean energy of a closed system is exactly equal to its mass or are there any other constants altering the value? | |
| Aug 9, 2016 at 19:06 | comment | added | user108787 | Thanks for writing that, I was getting away for years with the standard "energy is the ability to perform work" line, but Wikipedia ( for one example) has gone a bit coy regarding that definition. The field idea makes more sense. It's just that I can't explain QFT to the local energy healer / quack in my town. Thanks | |
| Aug 9, 2016 at 18:54 | history | answered | Zo the Relativist | CC BY-SA 3.0 |