Is the concept of finite mass-energy in the universe outdated?

[Jobrag]

I've always understood that there's a fnite amount of mass energy in the universe, please correct me if this view is out of date. As a particle accelerates it's mass increases how does this square with not being able to create mass or energy?

 

[Dale]

You may be interested in this FAQ
https://www.physicsforums.com/showthread.php?t=506985

 

[Drakkith]

I've always understood that there's a fnite amount of mass energy in the universe, please correct me if this view is out of date.

It depends on if the universe is infinite or not. We don't know either way yet.

As a particle accelerates it's mass increases how does this square with not being able to create mass or energy?

This is incorrect. The mass of a particle is always the same. Mass refers to "invariant mass", which is the mass of the particle in its own frame of reference.

Also, the equation is better thought of an equality and not a conversion. When one system performs work on another system, energy leaves the first system and is transferred to the second. This is accompanied by a change in mass of both systems, where the change in mass follows the equation e²=m²c⁴+p²c². This is the full form of Einsteins equation and includes the contribution of momentum.