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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
483 125,731
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 23,727
If light travels a metre in a unit of cosmological time now will it travel two metres in the same cosmological time...
May29-13 08:18 AM
Naty1
13 760
I am a sixteen year old aspiring theoretical physicist, my dream is to actually be the one who discover the GUT(I know...
May28-13 10:28 AM
Chalnoth
7 709
Can anybody point me to a rough calculation of the probability of a disembodied brain appearing from a random...
May26-13 03:48 AM
lukesfn
2 758
I was reading The Elegant Universe a few days ago, and came upon a passage (p.40) where Brian Green states "Over time...
May25-13 07:28 PM
Alektene
8 626
I've been developing an article on universe geometry that hopefully forum members will find as a useful reference,and...
May24-13 05:46 PM
cristo
13 505
I am very new to physics and astronomy, so I don't know much, but I have a theory so tell me what's wrong with it. So...
May24-13 03:26 PM
bapowell
9 960
Couldn't there be an equal amount of matter and antimatter in the universe. While from what I've read there is little...
May24-13 10:06 AM
DrChinese
15 1,220
Hello folks My name is Mike. I am into Cosmology ever since I was a kid. Throughout the years I strayed away from...
May23-13 10:44 PM
Spourk
10 1,270
Some big names going to be at UC Davies this week for early universe conference: ...
May22-13 05:19 AM
skydivephil
0 595
I have long been curious as to the Big Bang. Our cosmology is based on Hubble's observation of the red-shift and its...
May22-13 03:57 AM
DennisN
11 945
So, I posted this on a philosophy forum.... I was in a psychology class and I thought of something while reading...
May22-13 12:47 AM
kurros
4 768
So two of the theories of the universe are the big rip and the big crunch or bounce. Big crunch being expansion of the...
May21-13 11:10 AM
Mordred
2 785
Why didn't the big bang just become a black hole? Thanks, Jake
May20-13 08:55 PM
brianhurren
51 8,083
I don't know whether this has much general interest. I am interested by communication horizons in cosmology, or causal...
May20-13 11:31 AM
Chalnoth
11 884
Regarding the creation of the universe and the current model: Is it assumed that the universe, at the time of...
May20-13 01:10 AM
marcus
19 1,416
Hi there Am to teach a lesson on stars and galaxies to my year 7 class on Monday... Want to brush up on a few...
May19-13 11:11 PM
Chronos
8 753
By quantitative cosmology I mean with real times, distances, expansion rates, horizons, CMB stationary observers etc ,...
May18-13 12:36 PM
Mordred
13 823
Hi all, It is my understanding that a Doppler shift is the result of a change in wave frequency due to a change in...
May18-13 05:56 AM
mfb
1 576
I'm not a big fan of quintessence, but, this paper is interesting - Quintessence with Hybrid Potential,...
May17-13 01:35 AM
Chronos
0 595
I have been watching Susskind's lectures on Cosmology which are great. There is something that I can't wrap my head...
May16-13 08:57 PM
marcus
4 744
The basic equation of GR has a curvature constant Λ on the lefthand (geometric) side. The Friedman equation is...
May14-13 12:08 PM
Mordred
12 982
Everyday I sit and think about the universe, and after some thinking I always end up letting my imagination run wild...
May14-13 09:08 AM
Forensics
6 1,194
Where is the edge/boundary of the universe may sound like a simple question but I can see 3 possibilities. 1...
May13-13 05:09 PM
Spourk
133 7,479
There's a tutorial wiki for Jorrie's calculator. It needs exercises that beginning learners can do to help them get...
May12-13 01:36 PM
marcus
7 783
Quick question: is there a general formula for the redshift zC for a photon travelled in a spacetime with arbitrary...
May10-13 06:11 PM
George Jones
52 3,813
I tried out the new version of Lightcone today...
May10-13 03:45 PM
marcus
8 973
In a sense the universe is its own clock and the pointer-hand is the scalefactor, as in: "when distances were 0.1...
May9-13 05:18 PM
Mordred
10 1,111
I was trying to find an updated view on the plausibility of the Big Freeze. I believe that a couple of years ago, it...
May9-13 06:57 AM
bapowell
2 904
Is it possible for technology to advance such that we can travel back in time and be the ones to set the universe into...
May8-13 05:13 PM
Vanadium 50
4 847
The first stars formed when distances were 9% of their present size. The solar system began forming when distances...
May8-13 12:21 PM
Mordred
20 1,213
Developing a basic explanatory manual for the Light cone 1.0 calculator. This is as a supplement to give a basic...
May6-13 01:52 PM
Mordred
1 579
Hi. I read due interest papers in Arxiv. There is many times refereed to so called N-Body Simulations. Is that...
May6-13 10:25 AM
phyzguy
3 622
http://www.youtube.com/watch?v=VZiWKmhuaZE At about 7:00 he talked about imaginary time. Does that account for...
May5-13 09:24 PM
Simon Bridge
1 754
When the universe was young, and everything was closer together, did the extra gravity cause time to run slower than...
May5-13 05:48 PM
petm1
20 1,821
Einstein discovered that general covariance allows his GR equation to have just TWO gravitational/geometric constants:...
May4-13 03:32 PM
marcus
5 844
My question is what sort of material/matter existed to allow an expansion of the early universe? It had to be some...
May4-13 03:00 PM
spark802
8 791
It seems as though the contemporary consensus among cosmologists is that the universe is basically flat and Euclidean:...
May4-13 02:11 PM
WannabeNewton
33 1,871
Where did scientists reach so far about this matter? Any who had rejected it?
May4-13 05:11 AM
M. next
11 918
Here is a new paper, and thorough discussion of dark matter: Non-Baryonic Dark Matter in Cosmology,...
May3-13 07:24 PM
Chronos
6 706
So if there are as many galaxies in the Universe as is claimed what's the role of interstellar combination of light...
May3-13 07:18 PM
Chronos
6 278

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