Recent content by supermarina

I sort of knew that that would be an answer. But what does it mean? There are uncountable number of failed universes for few of them that are close to critical density? I will try to pose my OP question in a different manner. If, at any point of time, universe has exactly critical density...

I have few layman's questions, if somebody cares to answer. 1. How can Lambda be small intrinsic curvature? I take that you mean spacetime curvature, not space curvature. Shouldn't space and time evolve according to the presence of matter and energy in it? I mean, pre-curved spacetime doesn't...

You are right, bad wording on my part. Here is the assumption that universe begun with infinite extent (I am from some reason skipping singularity issues, and take that we are talking about very hot and dense state), and very precisely determined density, because the two are linked together...

I read it, and that is not the kind of common sense I was referring to. What will we believe in, if not in our ability to understand? Change of perspective is very powerful, not necessarily physical change, but rather mental. Nice posts in this thread, by the way.

Circle is object in two dimensions!

Well, just for fun, no. Earth-bound perspective tells you that World is flat. Change perspective, and common sense works just fine.

Recently while I was thinking about answers I was getting in another thread I realized that I have problem of conceptually grasping something. Problem is not mathematical in nature, it arises from what math is telling us. Average density of universe determines its spatial curvature. In order...

Ok, I see now. Any universe with Ωm,r+Ωλ=1 will have flat geometry, right? In any case, thank you Chalnoth, you've been very helpful to me.

Hi Chalnoth, thanks for replying. What set my confusion is fact that lambda term in equation in my first post is somewhere given as λc2/3, and somewhere it is λ/3. Also λ is somewhere given in length-2 (~10-35m-2), and somewhere in time-2 (~10-18s-2). When you multiply 10-35 with c2 you get...

Hi there. My interest in cosmology is purely amateurish, so bear with my ignorance. I have some questions regarding following Fridman's equation: H^{2}=\frac{8\pi G\rho}{3}-\frac{kc^{2}}{a^{2}}+\frac{\Lambda c^{2}}{3} 1. Lambda is usually given in units of s-2, or in units of m-2. When...