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Cosmology

- The origin, evolution, structure and eventual fate of the universe.
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Quality answers to common cosmology questions
Jul23-14 11:07 PM Greg Bernhardt 
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Jan16-12 Greg Bernhardt
To have an enjoyable cosmo forum we needed a balance between mental freedom on the one hand and a shared knowledge...
Aug2-14 07:51 PM
marcus
493 166,156
The new A20 tabular calculator lets you look at changing geometry out to about 88 billion years according to the...
Jun11-14 11:00 AM
Jorrie
65 45,005
Hi All Let's assume the Universe's topology is a standard hypersphere (i.e. it's finite) and it's only a bit...
Apr21-09 03:12 AM
qraal
14 2,045
This article on 4th Quantisation http://arxiv.org/pdf/1304.0259v3.pdf Takes the WDW equation to 3rd Quantisation...
Apr22-14 07:02 AM
bapowell
3 477
In QFT the background field is 2nd Quantised as opposed to remaining classical What exactly gets 2nd Quantised in...
Apr21-14 09:30 PM
Mordred
1 428
I have just seen this paper on constructing a cosmology for the accelerated expansion of the universe through...
Apr21-14 09:54 PM
Mordred
3 480
If the DeSitter Universe is modelled by Empty Universe 1. Very Early Universe with Inflaton Field 2. Very Far...
May31-14 06:28 AM
Quantizer
4 551
Given The Hawking-Hartle state is an initial state of the very early universe If the universe very far in the...
Jul1-14 03:36 PM
PeterDonis
15 2,229
Hi: The principle states that : the universe is homogeneous and isotropic. Then we have three solutions often...
Jan28-07 07:39 AM
Garth
3 2,586
American Scientists Online: see full issue: September-October 2007 Other Formats: PDF Modern Cosmology: Science...
Aug31-07 08:48 AM
oldman
12 3,206
What went bang to start everything?
Aug31-07 10:29 AM
ZapperZ
4 3,003
This is a big hole in the sky. Although you can't see it with the naked eye it actually covers almost 3 degrees of the...
Jan29-08 09:31 PM
Loki Mythos
65 11,043
I know that electromagentic waves do not need any type of medium, but why wouldn't it be possible for dak matter to...
Jun1-06 05:36 PM
selfAdjoint
7 1,983
I was reading in some "Discover" magazine on the universe in which they were talking on the pre-Big Bang universe with...
Dec23-09 05:00 PM
QuantuMekanic
0 1,292
:confused: How much physics do i need to know to embark on cosmology Do i need to be a complete expert in GR???
Nov12-07 04:02 PM
Wallace
7 4,847
Is our universe a 3 sphere expanding in time into nothing?????? OR i
Dec14-07 03:50 AM
cristo
1 2,193
Is there an event horizon beyond the visible universe where the laws of physics kind of get cut off, a limitation to...
Aug13-12 03:51 PM
Khashishi
15 2,913
If you take it to its extremes and space continues to expand at an accelerated rate, what happens when? 1) space is...
Aug20-12 11:08 AM
Aimless
12 1,750
Ok so me and a few of my physics (& Maths) friends were arguing this. I argued that it must be finite in size,...
Mar14-12 02:21 AM
bill alsept
115 15,695
We know that the CMB has been decreasing in temperature since the big bang. This is due to the continuing expansion of...
Jun29-08 08:09 PM
jonmtkisco
18 4,111
To begin with, I'll let you know I am a student. I am prone to theoretical physics and philosophy over cold, hard,...
Dec5-07 02:27 PM
QuantumMechanic
2 3,530
Does anyone have any information regarding the lack of knowledge as to what happened during the first three seconds of...
Dec6-07 10:20 AM
Garth
5 2,643
There is so much hooplah floating around cyber-space. And there's way too much to talk about in terms of BBT. So, how...
Dec13-07 10:26 AM
Janus
1 1,079
What role does the anthropic principle play in modern cosmology? How can we justify it? (Is it merely good old common...
Aug8-11 11:12 AM
rbj
15 2,422
Based on the idea that when matter is compressed and heated things tend to fuse and go to a “simpler state” the idea...
Aug16-08 01:59 PM
Quasar2287
4 1,650
Ho :), I would like to know how exactly stars and galaxies are spread out throughout the universe. Are...
Mar28-10 08:18 AM
graybass
2 919
Please help me with this question. Thanks
Mar27-10 05:32 PM
quddusaliquddus
2 1,423
First let me state my current understanding so that I can be corrected if not on the right page-- Given "zooming out"...
May22-12 06:57 PM
QuestionMarks
15 1,690
Let's assume as per the anthropic principle, for the mere sake of argument alone, that the physical constants of the...
Jan23-14 01:33 PM
Chalnoth
44 3,217
I've been mauling some questions about the end/edge of our universe in my head over the last couple hours, and Google...
Mar25-12 09:13 AM
Quiksilver421
4 1,218
and is my new thinking , which is taking me down a path of thought that, if objects in the observable universe...
Apr25-11 10:04 AM
bcrowell
44 5,312
If the Universe is 96 billion light years across and 13.7 billion years old, then doesn't that mean that the Universe...
Feb7-08 09:09 PM
drewterry
9 3,107
I'm aware I'm raising a topic which must have been discussed several times, but I couldn't find anything specific to...
Apr13-12 01:59 PM
Mark M
16 2,676
I guess I don't have much to say about this other than it's pretty amazing if it's true and I wanted to bring it to...
Sep16-10 04:43 PM
cristo
1 1,080
I have been following stories about dark matter and have, I think, a layman's grasp of it, to whit: In 1933 the Swiss...
Apr5-14 07:43 PM
berkeman
20 1,219
The concept of spacetime ripping or breaking (down) is common in science fiction, but does it have any basis in real...
Oct10-12 03:18 AM
Chronos
3 2,526
To Support the Theory of going into another dimension by travelling through a Black Hole. Since Scientists say you...
Aug8-07 02:34 AM
raccoon
22 4,271
In the beginning I have heard that the big bang came from an exploded singularity. What was this some sort of vacuum...
Sep8-06 11:39 PM
Chronos
3 1,788
Hello! I want to get my data in terms of h70 -1 Sometimes the estimates are in terms of h50 or h70, and I know...
Mar2-10 08:41 PM
cepheid
3 1,765
Hello!:wink: May I ask for a little assistance in filling in the gaps of my understanding? :S I understand that...
Mar4-10 09:23 AM
Radiohannah
5 1,739
Hello! :-) I've been thinking about the RW line element (c^2 d tau^2), and I understand that there is a term which...
Mar29-10 08:14 PM
Chalnoth
7 1,701
Hey I'm getting very muddled with my units, and would really appreciate some clarity :-) I have angular...
Mar1-11 06:55 AM
Radiohannah
2 1,303

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