Yes, but for people who doesn't have the level:-p there is another way to get them, you can arrive by using Newtonian Mechanics, and when finally you have the constant then you have to compare with the real one and then you substitute your constant by the one that appears in the original one...
Hey! I'd like to see an easy way to arrive to Friedmann equation by using Newton's Mechanics. I've seen many ways but they skip many steps so I don't understand the whole.
THANKS!
Hey! I made a similar question in another post and it was really useful, but I'd like to learn more about this relation, and why the propieties of SNe Ia make them so special, so we can call them standard candels and how did they lead us to the discovery of Dark Energy.
Thank you!:smile:
Hey! Yess, I have read and understood what happens before a Ia Supernova. (all of the degeneration effect created by the electrons -although i don't really understand why do they do it, I've read something about Pauli exclusion principle- and then when the red giant has "send" to the white dwar...
Hi! I have another question, it's about the redshift.
If SNe Ia are standard candels, the know the original bright, and they received the final bright, so, why did they try with more than one redshift?
Does the fact that the Universe is expandig change the result we obtain when we do...
Hi again!
(This has few to do with the rest but I didn't want to open a new post to ask it:-p)
Oks, now I think that i understand the "oversimplificated" history. Now let me ask you if you see it's good what I'm going to put in my project, or if you would say something else (this part is only...
Hi! I have more questions.
1st. Is there any diference between Cosmological Constant and quintessence?
2nd. If there is, which is?
I've only understood that cosmological constant is the energy of the vacuum but I don't know what quitessence is, so please, could somebody tell me if...
Hey! THANKS!
I think I'm beginning to Understand, let me tell you what I've understand and correct me please if I'm wrong.
They were observing a Supernova, and they know the redshift was z=0.5. Due to be a standard candel they thought they know the distance there was and they thought it...
Hi!
Marcus, thank you very much for your help.
I'll tell you what's what i know :-p
1. I know they've used Supernovae Ia to study the accelerated expansion of the Universe.
2. I've been reading mostly about Cosmology Supernovae Project (Saul Perlmutter).
3. Due to me lack of...
Hi, I have another doubt :biggrin:
In addition to the Supernovae Ia, which more brought us to think the expansion was accelerating? And is there any difference between dark energy and quintessence? Because I've heard that dark energy is like vacuum energy (cosmological constant) and...
Hi, I have an image of a graphic describing the spectrum of a supernova Ia, the problem is that I don't really know how to read it. I'd like to know if there's any importance in this image that can drive us to think about dark energy (or accelerated expansion).
The explanation of the graph...
Hi I have to do a project, and I've chosen dark energy as the principal item. But first I talk of the evolution of the Univers and others.
I just wanted to comment you the structure of the project and see if you thank it's good or you'd do it of another way.
1. Introduction
2. Main methods...
Hi, I've a doubt!
The principle says that we cannot find simultaneity the position and the momentum of a particle, I understand this because if I haven't understood bad it's because to find the position of a particle we need to trhow photons to it (and more and more) as much as we want to be...
Hi again!
I'm sorry but my maths aren't still good enough (this is my last year at High School) and I just know a little bit about derivatives, I understand some of the terms but it'd be great if you could explain me some things:
1. Always we talk about a(t) we're talking about the scale...