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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
492 159,642
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 41,500
Would gravitational waves act just like other types of waves? IE can they interfere, diffract, etc? I would assume no...
Sep16-11 05:36 PM
Nabeshin
20 2,869
Hello guys/gals, I understand this is a probably a stupid/impossible question in yalls eyes, but considering that...
Sep16-11 06:46 AM
bapowell
11 1,868
I haven't yet. http://www.colorado.edu/philosophy/vstenger/Cosmo/monkey.html I heard about it on the Cosmic...
Sep15-11 06:26 PM
Drakkith
3 2,296
I'm currently trying to reassess my image of the BB and the universe in general. I've been led to...
Sep15-11 08:21 AM
Hootenanny
34 3,295
I have a puzzle when I study the hybrid inflation model. Suppose we have two scalar fields, \phi_1 and \phi_2...
Sep14-11 10:12 AM
Chalnoth
5 1,988
Any galaxy that we can see, must have been travelling at less than light speed when the photons that we now see,...
Sep13-11 03:31 PM
Chalnoth
57 9,256
In this thought experiment the sun does not run out of fuel and the earth is still here. So in 14 billion years we...
Sep13-11 03:06 PM
chrisbaird
5 1,723
So, if space expands (measurements gets larger) in the presence of low mass, as between galaxies but not within...
Sep12-11 11:14 PM
Chronos
2 1,199
There was a thread here a few minutes ago, posted by a new user, called "Thoughts about the universe". It contained...
Sep11-11 02:48 AM
mitchell porter
26 3,700
where did the freidman equation come from?
Sep10-11 09:52 PM
Chalnoth
7 1,316
The title pretty much sums up what I am not comprehending. At about the time when atoms stopped forming I am asked to...
Sep10-11 11:03 AM
csmyth3025
6 1,690
Had our observations shown shown that the Universe was not expanding, and was instead static, where would that have...
Sep9-11 07:20 PM
Hlafordlaes
4 1,800
Is there a known quantity of CMb phtons? Presumably we can only recieve a finite amount in our detectors, but is that...
Sep9-11 02:28 PM
Cosmo Novice
8 1,782
Dear all, As u know, one of the best potentials for quintessence is V=^\alpha] \phi]^\alpha] They usually call...
Sep9-11 12:33 AM
shadi_s10
4 1,733
Hi, I have lots of questions, they occured to me last year during the physic/chemistry class and I asked the teacher...
Sep8-11 06:06 PM
Drakkith
8 1,613
Almost all textbooks tell us that the cosmic redshift is arised from the cosmic expansion rather than the recession of...
Sep8-11 07:57 AM
Naty1
3 1,978
I've heard that the prevailing theory of cosmology before the Big Bang was that the universe is static and eternal. ...
Sep7-11 04:21 PM
Chronos
17 4,089
Okay, so here's my questions: 1. Why can't we see the light from the big bang? If it happened 14 billion years...
Sep7-11 10:21 AM
ptalar
5 1,978
So I was watching the show "Curiosity" on the Discovery channel last night. In the show, Stephen Hawking describes...
Sep6-11 03:54 AM
Chalnoth
14 3,346
Why will the Hubble parameter only decrease to .85 of today's Hubble parameter?
Sep6-11 01:44 AM
marcus
2 897
I was watching a documentary the other day and this idea occurred to me. Here are links to the relevant portions on...
Sep5-11 11:18 PM
David Elm
93 16,878
First a true-false question. Are the furthest visible galaxies presently incapable of any connection with us. That...
Sep5-11 05:01 PM
Shovel
8 1,975
Stephen Hawking gave me a clear timeline of the universe, from the expansion of the singularity to its current (and...
Sep5-11 03:17 PM
jackmell
51 8,438
Hello first time to this forum ^^,It is awesome very good work, So i was wondering if there was a topic about...
Sep5-11 01:35 PM
Narrow_Quasar
0 786
I recently watched Stephen Hawking on Discovery's "Curiosity" and found his assertion that a grand designer could not...
Sep5-11 03:45 AM
Chalnoth
64 8,072
If the acceleration of the expansion of the universe is driven by the vaccuum energy 'created' by newly-formed space,...
Sep3-11 11:00 PM
keepit
6 2,245
After the big bang, did the cosmic inflation of space occur as a gravitational wave?
Sep2-11 02:07 PM
Lino
27 3,124
(Maybe this should go under General Math or maybe even Topology but since it's about the dimension of the universe...
Sep2-11 08:31 AM
mnb96
1 2,428
I know that the rubbersheet / fabric analogies that we see on TV and in various diagrams are only a metaphor, but I'm...
Sep1-11 04:41 AM
Lino
17 3,637
I recently watched curiosity and i have been having a hard time grasping how it describes the creation of our...
Aug31-11 07:24 AM
bapowell
10 2,564
The process in which the nucleus and electrons combined to form neutral atoms at early times is called recombination....
Aug31-11 02:12 AM
Chronos
3 1,585
I was just reading on wikipedia about the expansion of space. ( http://en.wikipedia.org/wiki/Metric_expansion_of_space...
Aug29-11 08:36 PM
cephron
6 1,546
http://www.bbc.co.uk/news/science-environment-14680570 Results from the Large Hadron Collider (LHC) have all but...
Aug27-11 03:12 PM
Chronos
1 1,386
I was watching Brian Cox on TV last night and he was talking about the heat death of the universe and made the...
Aug27-11 06:16 AM
phinds
17 2,962
Right after the big bang a gas consisting of many elementary particles, including neutrinos and antineutrinos was...
Aug27-11 03:30 AM
Chalnoth
3 1,336
How can we see light from 400K years after the big bang? Are we older than this light? Did we travel faster than this...
Aug27-11 12:57 AM
Chronos
14 3,016
I've read that the universe is Euclidean and have also read that space is bent by gravity. Descriptions of geometry...
Aug26-11 11:37 AM
TrickyDicky
10 2,112
In a reply to a correspondents question, it was stated that the expansion rate of the universe is slowing. This would...
Aug25-11 08:18 PM
edgepflow
15 3,270
According to John Baez, Einstein's Field equations can be written in the following form: V'' / V = - 1/2 (rho +...
Aug25-11 04:22 PM
Chalnoth
4 1,967
I have heard statements made that at the instant of the Big Bang, the entire universe was condensed into an incredibly...
Aug25-11 03:29 PM
phinds
26 3,815

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