Recent content by Lurian

Hey! In cosmology the notion of a photon fluid is often used, i.e. a perfect fluid with the equation of state P=\frac{\rho}{3} and the stress-energy- momentum tensor of a perfect fluid. On the other hand, a photon fluid is just an electromagnetic field with the well- known definition for its...

In the course of my research I came across this PDE \frac{\partial{a_0}}{\partial{x}}\frac{\partial{a_1}}{\partial{y}}-\frac{\partial{a_0}}{\partial{y}}\frac{\partial{a_1}}{\partial{x}}=0. with both functions depending on x and y. I am quite sure I have seen equations of this form before but...

Hey, For a problem I am working on I need to know if the energy-momentum tensor of the Reissner- Nordstrom metric obeys the weak energy condition. Since I need the result for the following calculations, I just want to be sure that it is correct. Does anyone of you know the correct answer and...