Recent content by properman

Alright, thank you very much for your help.

Ok, so you are telling me that in order to get a perfect model it would need to be a differential equation, which of course is what the Friedmann equations are. well there goes that idea.

Those above equations require the use of different equations for different times in the expansion of the universe. What I am looking for is one equation that can model the expansion for the entirety of the expansion.

Right. Didn't really think that through... So then would there be such a function that is not the piece-wise function mentioned above? Would it be to solution to one of the Friedmann equations? Thanks for putting up with my random questions, I just was stricken by an idea earlier, and in order...

One could almost think of an old player piano where little bumps at different places make different sounds. You could think of different amplitudes or wavelengths as changing the location of the bump on the roll.

Oh well. Thank you anyway. I meant was looking for a single variable function of expansion over time, ie. a(t). But apparently from the post above, that does not exist as a smooth function.

oh shoot, I messed up writing it. it should actually be y'' - 2y' = x + 2e^x Sorry about that

So I learned about these equations in my math class this spring, and it has been bothering me for some time that you are able to merely drop the offending term when there is overlap in the solutions. A quick example might help, seeing as I don't really know the true terms. When finding the...

As the title suggests, I am wondering if there is an alternate way to describe the expansion of the universe outside of the Friedmann Equation. Specifically, can the expansion of the universe be modeled on time alone?