xX_minecraftMLGPRO2019_Xx

Thanks a lot!

I'm afraid you are massively overestimating my knowledge of physics. I remember that equations of state are the relation of density and pressure of gases and fluids, but I don't really understand much in the article itself, I just wanted to know if a hypothetical Big Rip could be caused by a phantom field with positive kinetic energy.

I was reading some articles about dark energy and its possible equation of state. I stumbled upon this article https://arxiv.org/abs/1804.02987 which stated that "a dark energy field with w < -1 is a viable option", "phantom dark energy does not categorically have negative kinetic energy" and "kinetic energy is positive for w≳−1.22, which includes virtually all values of constant w allowed by cosmological data constraints". I'm a bit confused with negative and positive kinetic energy of dark energy, but all sources I've read have stated that Big Rip can happen due to a phantom dark energy field with a negative kinetic energy. Does it not happen if the field has w > -1 but positive kinetic energy? Apologies if I'm misunderstanding something.