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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
483 125,885
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 23,820
arXiv:1404.5682 arXiv:1404.5682 Assessing Pulsar Timing Array Sensitivity to Gravitational Wave Bursts with Memory...
T 02:58 PM
wolram
1 79
In general, what's a good way to understand the structure of the universe? I'm especially curious about the nature...
T 01:44 PM
Mordred
45 964
Inflation is often referred to as a period of 'superluminal' or 'faster-than-light' expansion (e.g. see article on...
T 11:16 AM
phsopher
0 83
Excuse my simple mindedness about the question but which of these has more evidence for being true? Either there was...
T 01:24 AM
julcab12
13 376
Looking at images of the cosmic web, I would have expected the view to change the older the galaxies are. I...
Y 11:22 PM
Mordred
1 155
In his popular cosmology book "Que faisiez-vous avant le Big Bang" (sorry, it doesn't seem to have been translated...
Apr22-14 09:09 AM
Mordred
12 409
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
3 179
I have just seen this paper on constructing a cosmology for the accelerated expansion of the universe through...
Apr21-14 09:54 PM
Mordred
3 192
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
1 168
Hi there, Im reading about inflation, perturbations and so on, and every book I read take the SVT decomposition as...
Apr20-14 10:39 PM
the_pulp
3 333
Hi guys. Consider the mean occupation number and specific intensity of the CMB photons in the CMB frame as given by...
Apr19-14 03:45 PM
WannabeNewton
3 200
This paper; http://arxiv.org/abs/1404.4614, Negative running prevents eternal inflation, claims Planck and BICEP2 data...
Apr18-14 09:34 PM
bapowell
2 261
I've been doing some Cosmology, but I'm having a really hard time understanding the results for the age of the...
Apr18-14 09:45 AM
George Jones
2 361
Greetings, How is new space created? There was no space before the big bang, correct? And the universe is still...
Apr17-14 11:54 PM
ptalar
105 3,129
Hello all, this is my first post here. I'm about as literate in physics as an ant is literate in algebra, but I was...
Apr17-14 06:57 PM
Drakkith
4 265
In classical physics we took space and time as distinct absolute. But in GTR space-time continuum only come into play....
Apr14-14 07:37 AM
George Jones
11 528
In Dr. Tyson's first episode of Cosmos he said "...there are parts of the Universe that are too far away. There hasn't...
Apr14-14 12:20 AM
Chronos
17 1,043
The ideal gas has the following requirements. 1) there are no intermolecular forces between the molecules. 2) the...
Apr13-14 06:50 PM
Mordred
23 1,173
Let me start off by stating that I have no formal education in Astrophysics, or any other education beyond high...
Apr12-14 08:02 PM
Mordred
37 1,621
Hi, I was just wondering if someone could explain to me in detail what cosmologists mean when they say "the universe...
Apr12-14 11:44 AM
billyalex2
15 878
http://www.sciencefriday.com/segment/04/04/2014/sir-roger-penrose-cosmic-inflation-is-fantasy.html What does Sir...
Apr12-14 03:25 AM
julcab12
12 512
If all the matter in the universe was compressed into single tiny space before the big bang, where was it? I mean "Out...
Apr11-14 12:34 PM
Mordred
2 260
Hi, I have some confusion about the cosmological constant (CC). From what I have read it is to do with the energy...
Apr10-14 11:10 PM
Chronos
23 903
I'm trying to get a basic understanding of the big bang in order to teach an advanced oceanography course to high...
Apr10-14 03:44 PM
Chronos
13 533
Like many, I have just recently learned about the theory of inflation and, though learning about, noticed a problem...
Apr10-14 12:14 PM
Mordred
29 1,179
So I have been thinking. Light gets redshifted because of the cosmological expansion of the Universe. This would mean...
Apr9-14 06:28 PM
Matterwave
8 428
The PF home page has some news items in the righthand margin and one is about this: http://arxiv.org/abs/1404.1801...
Apr9-14 01:18 AM
julcab12
4 309
Is CCC killed by BICEP2 or there is a way in which it survives?
Apr7-14 07:16 PM
Haelfix
2 428
From other threads here Iíve gained a rough understanding of why Dark Matter forms into a halo around galaxies. It...
Apr7-14 04:34 PM
oldGhost1
6 401
I've read that the further away a Galaxy is from us the faster it moves away. By this logic how can scientists...
Apr7-14 08:53 AM
Yashbhatt
13 424
Ok so I'm a bit confused as to how to attempt to answer this question? Describing its significance vs explaining its...
Apr6-14 10:02 PM
marcus
9 344
Jorrie's calculator (Lightcone) makes cosmic history tables which tell you among other things the Hubble times in past...
Apr5-14 09:07 PM
marcus
1 382
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
20 869
Haven't seen this mentioned here yet. This week's Time Magazine has an article on the recent experiment at the South...
Apr4-14 02:54 PM
somebodyelse
43 2,087
Quick question: what is meant by thermalization of photons? And how could this effect distort CMB spectrum...
Apr4-14 10:36 AM
Mordred
8 507
Hi, everybody. I have the question about initial, gravitational big bang singularity. My first question is if the...
Apr4-14 08:52 AM
craigi
47 1,825
I would like some introductory level references for building an n-body gravity simulation. I work for the...
Apr3-14 04:30 PM
nearc
12 697
Hi, i've just installed Healpix on IDL, and i'm starting to try all the subroutines. First of all, i learned how...
Apr3-14 05:10 AM
fineTuner
16 624
NOTE: I am not a cosmologist, so if any of my statements are not correct please tell me. When we observe distance...
Apr2-14 01:52 PM
No-where-man
70 2,797
Hello! I'm a senior at San Francisco State University, and I'm currently enrolled in a cosmology class. It's a GWAR...
Apr1-14 10:13 PM
Mordred
3 453

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