Recent content by fsujoseph

Oh wow never mind it was -x^2 not x^-2

Homework Statement Solve the differential equation. -x2(dy/dx) + xy = x2y2 * sin(x) Homework Equations None. The Attempt at a Solution I first figured out that this was a Bernoulli's equation. I distributed the x2 to make it simpler. From there I divided everything by y2 to get y-2(dy/dx) +...

If we can only see things that traveled 14 billion light years away (I think) or less, then why is there a so called observable universe? If everything started at a singularity, wouldn't we have already seen everything? It's hard to put this question into words. How can something be farther away...

So you mean the universe could possibly have different physical laws than the ones we observe?

That's fascinating! But is the answer really more satisfying than to say the Universe has an infinite number of galaxies?

I am familiar with String theory and the Multiverse theory, but I didn't know that apparently String Theory points to a multiverse? Can anyone give insight to this? Also what do you guys think about the Multiverse theory? Personally it is far-fetched, but I am not dismissing it. I don't want to...

Ohh I see now! Thanks!

Yes, mis-type. No where I am getting caught up is you said 8 billion years ago is when inflation began, so the 5 billion years of expansion was based solely from the force of the big bang? Gravity did not crunch in 5 billion years? That is my question

As far as we can tell?

Thanks, and yes I understand it's all hypothetical. While I've got your attention, I clicked the link in your signature and read how dark matter is causing inflation not expansion. Then I realize I never answered one of the most basic questions, or thought about it. If dark matter wasn't causing...

I see... so it seems like we are heading towards a 'mini' big rip? Only the local galaxies will be within the visible universe many years from now. Is that accurate?

From what I have gathered, dark matter is finite, correct? The more space expands, the less dense dark matter will be. So billions or trillions of years from today, space will have expanded a lot and the density of dark matter will decrease from a universal view. But if dark energy is a constant...

I am only in year 1 of my undergraduate degree, but as long as you know some maths you can contribute to really any project by doing the grunt work.

Actually scratch that. When I am getting the undergrad in Physics, will I be doing enough broad research and classes to help decide what field I want to go in? Right now I'm thinking Particle or Astro

Thanks for the replies! I want to work on the theoretical side, but what I am mainly asking is thoughts on choosing the specific degree I would major in.