If you have negative energy, is it possible to make negative mass using the negative energy?

And also, if you can convert it to mass, are you able to accelerate that mass to speeds close to the speed of light so that you would get more negative mass?

We don't really have negative energy - lots of energies are counted as negative in a book-keeping sense - but proper negative energy is still hypothetical. Negative mass is similarly so - there is research into exotic matter and there are threads here about the possibility of using exotic matter to create wormholes or bubbles in space time, but keep in mind it is all hypothetical and completely unrealisable at present

We don't really have negative energy....

 

 

That maybe open for interpretation. We can actually make pseudo-negative pressure, a very miniscule amount of negative energy in the Casimir effect.

 

 

That maybe open for interpretation. We can actually make pseudo-negative pressure, a very miniscule amount of negative energy in the Casimir effect.

 

 

The negative energy explanation for the casimir effect is very hypothetical. It is more the lack of an energy that exists everywhere else - if we are being heuristic about it. Negative energy is really not required for the two main leading contenders to explain the effect

Yes, I am not thrilled by the ''other explanations'' for the Casimir effect. What people forget is that the Casimir effect was discovered [because] and only because quantum theory predicted it.