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Quality answers to common cosmology questions
Jun25-11 08:50 PM bcrowell 

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Cosmology

- The origin, evolution, structure and eventual fate of the universe.
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To have an enjoyable cosmo forum we needed a balance between mental freedom on the one hand and a shared knowledge...
Apr8-14 08:39 AM
Jorrie
483 125,880
The new A20 tabular calculator lets you look at changing geometry out to about 88 billion years according to the...
Feb8-14 08:31 AM
mfb
61 23,817
I know there are three models of the universe: closed, flat and open. But which one of these models is the most...
Feb17-11 02:51 AM
Alvasin
6 2,893
Greetings, Due to extreme time dilation by gravity, is time stopped or nearly stopped inside the event horizon of a...
Feb16-11 09:19 PM
Tanelorn
24 5,443
Why is the Milky Way a barred galaxy? http://en.wikipedia.org/wiki/Barred_spiral_galaxy ...
Feb16-11 09:02 PM
Radrook
5 1,238
How can we tell the values of dark matter and mass in the universe when it is say five times its original size?
Feb16-11 04:01 PM
Nabeshin
5 1,433
Why exactly is it so important to know about the models of the universe(flat/open/closed)? Why is it so important to...
Feb16-11 11:50 AM
Tanelorn
24 2,316
I think my argument is better this way round. 1/ Assume that space is flat and that there is no cosmological...
Feb16-11 04:20 AM
yogi
9 1,618
In the picture given to us by loop quantum graivty, the big bang is replaced by the big bounce. So 13.7 billion years...
Feb16-11 03:21 AM
Chalnoth
4 1,472
1. The problem statement, all variables and given/known data Suppose that in sherwood forest, the average radius of a...
Feb14-11 07:52 AM
armin.hodaie
12 3,725
So I'm reading about the inflationary period and something occurred to me that never seems to be addressed in the...
Feb14-11 07:29 AM
bapowell
2 1,124
What exactly does the critical density mean? In articles they keep comparing the desity of the universe to the...
Feb14-11 04:37 AM
Chalnoth
3 2,137
If the universe was decelarating and then started to accelerate can we calculate when this happened, and if so how can...
Feb13-11 07:11 PM
mathman
1 824
What gave rise to cosmic inflation of the early Universe?
Feb12-11 04:02 PM
Chalnoth
4 1,303
I read this in article "Misconceptions about the big bang" that was mentioned in another thread: "For example, when a...
Feb12-11 08:29 AM
Tanelorn
24 3,277
If the universe is all there is then it can't be radiating light to anywhere else. Thus light must be trapped inside...
Feb11-11 05:17 AM
Chronos
1 1,376
Hey guys, newbie here! I stumbled upon your forum while searching for an explanation i was looking for in regards to...
Feb9-11 09:08 AM
Tanelorn
1 1,440
I was wondering, since vacuum energy is supposed to have some energy density,according to standard comology equating...
Feb9-11 04:17 AM
stevebd1
7 1,776
Can someone give a link or other source of the timeline of big bang which associates each EPOCH to it's relative GeV?...
Feb8-11 11:27 PM
Deepak247
0 976
I recall that the absence of Anti Matter used to be a concern to Cosmologists, has this situation changed in recent...
Feb8-11 06:14 PM
Chalnoth
18 2,031
why is the redshift space correlation function smaller than the realspace correlation function at small scales and the...
Feb7-11 04:23 PM
marcus
3 1,462
I just read this... http://arxiv.org/abs/gr-qc/0505037 Here's my condensed paraphrase, Those of you familiar...
Feb7-11 01:03 PM
marcus
3 1,578
I found this on wikipedia: Indeed, such a treatment of infinity is ridiculous, but treatments exist in our head...
Feb7-11 10:03 AM
darkhorror
28 3,824
Hi, http://www.msnbc.msn.com/id/3077693/ns/technology_and_science-space/ ...
Feb6-11 05:16 PM
zhermes
1 1,199
Hi, first of all I have to say that I know practically nothing about cosmology, though I know some basic physics. ...
Feb6-11 11:03 AM
andresordonez
2 920
I've heard in the past something along the lines of "every atom in your body came from an exploding supernova". Yet,...
Feb6-11 01:57 AM
Chronos
3 1,882
I was watching a program on dark matter and how galaxy spin was used to deduce the existence of dark matter. The...
Feb5-11 02:56 PM
Nabeshin
6 1,517
I’m sorry, but I find dark matter and dark energy problematic. It’s hard to think of a Universe made up of about 95 %...
Feb5-11 12:15 AM
Imax
11 1,395
guys, i got a simple question i'll make it in parts after stating what i think is well known... a) speed of light...
Feb4-11 12:14 AM
Chalnoth
3 1,063
I really enjoyed Sean Carroll's book "From Eternity to here" and his explanation about the connection of the arrow of...
Feb3-11 01:14 AM
Chalnoth
1 1,040
Hi, I'm trying to figure out how inflation (just deSitter) solves the horizon problem, but I am stuck. I understand...
Feb2-11 02:38 AM
torus
4 1,680
If there are 2 objects emitting light to each other and the light fills the spacetime between them and then that...
Feb2-11 01:17 AM
zonde
14 2,428
If the universe is mathematically based - which it looks increasingly like it is the case - than it would be self...
Feb1-11 06:19 AM
qsa
19 2,367
Hi... Can anyone one give me a good reference for the decomposition of perturbations into independent scalar,...
Jan31-11 09:46 PM
krishna mohan
6 2,030
What is he earliest time when life could form in the Universe? If it is infinite, there always are very ‘lucky’...
Jan31-11 07:04 PM
Chalnoth
45 4,308
We are told the universe is expanding because galaxies are red shifted and that it is a doppler effect. Do blue...
Jan29-11 01:31 AM
Chronos
2 3,418
Hi all, I was reading about eternal inflation however one thing that remains unclear to me is that how does one...
Jan28-11 09:18 AM
Tanelorn
8 1,490
arXiv:1101.4890 (cross-list from gr-qc) Title: On the quantitative interpretation of dark energy by quantum...
Jan28-11 03:50 AM
nismaratwork
1 1,768
This is a basic question. If the expansion of the universe's radius is faster than c, and that speed is increasing or...
Jan27-11 03:30 PM
Chalnoth
4 1,101
Having recently read Goldilocks Enigma by Paul Davies, I would like comments on my simplistic logic. Why does our...
Jan25-11 07:07 AM
Chalnoth
32 3,051
First time poster and non-cosmologist. Why can't we use telescopy (across the EM spectrum) to view the formation...
Jan24-11 08:04 PM
D H
4 1,305
As the universe expands... Is it that we are more on the surface of a balloon, so the expansion is similar for us...
Jan24-11 10:54 AM
amaruq
0 834

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