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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...
Jul25-14 06:02 PM
marcus
492 161,855
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 42,692
What are the current theories as to the source of the new space that accounts for dark energy?
Sep10-13 06:46 PM
andrewkirk
20 2,677
The Schwarzschild equation for a black hole's event horizon is rsh = 2GM/c2 or (1.48 x 10-27 m/kg) x M. Thus, the...
Sep9-13 09:45 AM
timmdeeg
10 1,624
greetings gentlemen, i found this interpretation of red shift observations interesting:...
Sep8-13 11:53 PM
Drakkith
7 1,799
In the interest of broader participation, feedback, transparency etc, maybe we can have (in regular cosmo forum) a...
Sep8-13 04:47 PM
marcus
0 607
In this present world we can see that many objects grow branches itself for growth .For example, 1.trees grow in size...
Sep8-13 03:39 PM
Mordred
3 771
By anti-universe, I mean a universe where anti-matter dominates over matter and the direction of time is reversed. My...
Sep7-13 08:49 PM
256bits
26 2,616
What do you think of this argument? Lets suppose an infinite and eternal universe that is homogenous on a large...
Sep5-13 04:56 PM
andrewkirk
16 1,647
Morning everyone, We know of some illusions in our everyday experience, such as an echo making us believe someone...
Sep5-13 08:20 AM
Chalnoth
11 1,412
This is what I understand. I can be wrong though. Please let me my conceptions are wrong. If by ''space'', you mean...
Sep5-13 07:39 AM
tarekatpf
3 1,020
Assuming that the early inflation of the universe is driven by the potential energy of some inflaton field(s), the...
Sep4-13 11:59 AM
cristo
8 2,854
Is there evidence of space surrounding the BB singularity?
Sep1-13 04:39 PM
DennisN
13 1,760
Found this article: ...
Aug31-13 01:06 AM
Chronos
3 1,142
We are told that at the centre of a black hole lies a singularity; very small and very heavy. We here a lot about the...
Aug29-13 10:45 AM
graybass
46 8,684
I recently read an article (http://vixra.org/abs/1308.0143) written by an acquaintance, Dr Dimitar Valev and wanted...
Aug28-13 04:00 PM
cristo
1 786
I have read the time line several times for the BB: http://en.wikipedia.org/wiki/Timeline_of_the_Big_Bang And I...
Aug27-13 10:15 AM
Tanelorn
7 1,041
Hi, I have some questions that came up while thinking of this idea of parallel universes, I'm glad if someone could...
Aug26-13 09:55 AM
Chalnoth
7 1,103
Can other universes exist? Can they have different laws of physics and/or different laws of math than our own universe?
Aug26-13 09:39 AM
cristo
25 3,115
I can't get my head around it when theoretical physicists talk about types of branes and how these branes could be...
Aug25-13 07:39 PM
mjacobsca
5 1,035
The Friedmann solution(s) to the GR cosmological equations (without Lambda) assume pressure=0. What happens if we let...
Aug24-13 10:41 AM
George Jones
7 1,136
How were quarks occurred ? (in the early universe) Thanks
Aug23-13 07:17 AM
bapowell
3 924
Hello here, I am currently working on the topic of inflation. It seems that at the stage of inflation, the...
Aug23-13 03:15 AM
Anne-Sylvie
0 645
Something occurred to me the other day when looking at pictures of the universe. This might be obvious to some, and...
Aug22-13 10:15 PM
phinds
7 1,029
what if the evolution of the universe over time and the expansion of space a series of binary events such that the...
Aug22-13 07:28 PM
Viracocha
1 738
Hello. I a few hours ago opened a new thread called "Big Crunch". But now that I've learn that it's not really...
Aug22-13 07:01 PM
Viracocha
6 1,349
I think Big Bang theory is valid because of Inflation theory, it states that universe expanded faster than a...
Aug22-13 06:53 PM
Viracocha
44 7,859
Sorry if my questions are rather naive, this is my first post on this forum. Whilst burshing my teeth, I was watching...
Aug22-13 06:41 PM
Viracocha
3 789
1. Forgive me for this novice question, but can variation in the expansion rate of the universe, be partially...
Aug21-13 12:03 PM
Drakkith
31 2,241
Does anyone know if it is possible to construct a compact 3-manifold with no boundary and negative curvature? I ask...
Aug21-13 11:40 AM
Chalnoth
2 661
If the holographic principle says that the the observable universe could be represented as a two dimensional surface,...
Aug21-13 11:35 AM
Chalnoth
1 899
"Cosmology is the scientific study of the properties of the universe as a whole." That definition seemed concise...
Aug17-13 02:30 PM
Clayjay
7 1,265
When we look out into deep space we see a red shift in the light from distant sources because they are more or less...
Aug15-13 12:31 PM
Mordred
2 768
I approach this cautiously but with interest. (How often do ideas like this work out?)...
Aug15-13 07:32 AM
John86
14 2,044
I am working on Weinberg, Cosmology book. I am currently reading Chapter 6. At the last paragraph of Page 257,...
Aug15-13 01:52 AM
Mordred
12 961
Question : suppose space comes into existence (expansion of space) where ever there is a local lack of mass or energy...
Aug14-13 11:40 PM
Mordred
1 775
This paper makes some interesting points: A Dynamic Dark Information Energy Consistent with Planck Data,...
Aug13-13 02:44 AM
cristo
1 754
This has probably been covered here before, and it's a pretty basic question but one I've often wondered at. I read...
Aug9-13 01:16 AM
Graeme M
18 2,427
So, I was thinking about this the other day. If we watch material approaching near the event horizon of a black hole...
Aug8-13 07:35 PM
SriLanka
19 2,457
Let's say that an event releases a 1 second burst of EM radiation that propagates outward from the source in a...
Aug8-13 04:36 PM
Chalnoth
21 2,109
On the page 17 of this article by Max Tegmark http://arxiv.org/pdf/gr-qc/9704009v2.pdf, in figure 7, it has been...
Aug8-13 02:13 PM
Naty1
3 907
I, along with many other people, believe (for the most part) in the big bang. However matter cannot be created or...
Aug8-13 12:02 PM
Greg Bernhardt
1 913

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