# Einstein and Lorentz

## Main Question or Discussion Point

I am hoping someone can help me with something. I want to go into the field of temporal physics and I was wondering if someone could help me understand why Einstein's E=mc2 isn't combined with Lorentz's factor ϒ=1/√1-(v2/c2) to further prove the light-speed barrier?

Related Other Physics Topics News on Phys.org
Nugatory
Mentor
I was wondering if someone could help me understand why Einstein's E=mc2 isn't combined with Lorentz's factor ϒ=1/√1-(v2/c2) to further prove the light-speed barrier?
Both of these relationships are derived from the same underlying assumptions (the two postulates of special relativity - Google for "On the electrodynamics of moving bodies" to find Einstein's 1905 paper on SR) as the light-speed limit. Thus, using them to "further prove" the lightspeed limit doesn't tell us anything new; it just shows that the assumptions that lead to the light-speed limit lead to the light-speed limit.

ChrisVer
Gold Member
Also the relation $E=mc^2$ is already given at a certain Reference fram (the rest frame of the object of mass $m$ ). So how would you put a gamma factor?

T
Both of these relationships are derived from the same underlying assumptions (the two postulates of special relativity - Google for "On the electrodynamics of moving bodies" to find Einstein's 1905 paper on SR) as the light-speed limit. Thus, using them to "further prove" the lightspeed limit doesn't tell us anything new; it just shows that the assumptions that lead to the light-speed limit lead to the light-speed limit.
Thank you for the reference, Nugatory. Also, could you recomend any books or sights that are credited and discus the possibility of Tachyons?

Khashishi
$E=\gamma m c^2$
The common equation $E=mc^2$ is only valid for particles at rest, when $\gamma = 1$.
$E=\gamma m c^2$
The common equation $E=mc^2$ is only valid for particles at rest, when $\gamma = 1$.
$\gamma = 1$ when the velocity of the said object or particle is 0. Therefore the Lorentz factor would equal $1/1$ or simply, 1.