The expression mc2 does have the dimensions of energy and is independent of the reference frame, since it's a function of quantities that are invariant under global Lorentz transformations. It's the result of the statement that, for any object, the combination E2-|p|2c2 is invariant under global Lorentz transformations, therefore can serve as the definition of the mass of the object-so it makes sense to write it as mc2.

Dear Stam Nicolis,

Outside of current knowledge, it seems to me that the mass energy is expressed by mcc for only certain values ​​of the Lorentz factor in particular when this factor is equal to one (v=0). But there must exist at least one other value of the Lorentz factor where mcc applies for the mass energy. In this last case, v, depends directly on, c. It should exist a fundamental proportion of v to c that we do not yet know, it is a bit like the ultimate formula of the fine structure, which makes mcc valid as a formula for the mass energy of a particle. It seems to me that the equilibrium of the universe from its infinitely small to its infinitely is guaranteed by this said proportion.

Kind regards

There's a miunderstanding. mc2 is indepndent of the reference frame whatever the relative velocity of the reference frame(s) is. It is the energy of the object, however, only in the reference frame in which the object is at rest. In an arbitrary reference frame energy and momentum satisfy the relation E2-|p|2c2=(mc2)2, which implies that E/mc2=coshφ, |p|/(mc)=sinhφ and |v|/c=tanhφ.

Dear Stam Nicolis,

I will publish a preprint in RG soon. I hope this preprint will add new things on this topic.

Kind regards

Dear Stam Nicolis,

You are absolutely right but there must be another equation that is so crucial and fundamentally linked to mcc, I will publish it soon.

Best regards

Dear Stam Nicolis,

Thank you for explaining this to me, I can now continue working with confidence on the subject.

Best regards