Recent content by goksen

In a review on dark energy, it says the continuity equation implies p_\Lambda = - \rho_\Lambda using the Friedmann equations with a cosmological constant. I think it is related to fluid dynamics but don't know much about it. Can you explain how?

I want to add a familiar question of PF: Why has'nt anybody answered my question? A) the question is not clear B)this is not the right forum C)the title is not attractive

I am trying to understand differentiable manifolds and have some questions about this topic: We can think of a circle as a 1-dim manifold and make it into a differentiable manifold by defining a suitable atlas. For example two open sets and stereographic projection etc. would be the...

Homework Statement can we measure time and accelaration at the same time? what exactly acceleration operator is? Homework Equations heisenberg's uncertainity principle The Attempt at a Solution I guess acc. operator is dp/dt i.e. \frac{\partial^2 }{\partial t \partial...