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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
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 45,155
To have an enjoyable cosmo forum we needed a balance between mental freedom on the one hand and a shared knowledge...
Aug2-14 07:51 PM
marcus
493 166,472
I imagine it must....Could we have dark anti-matter in our universe that doesn't interact with ordinary matter? Would...
Apr7-12 06:38 PM
Drakkith
47 11,145
Hubble Constant=H distance = d recession velocity = v radius of Universe (light travel distance) = R speed of...
May24-06 02:18 PM
kmarinas86
2 1,365
i apologize if my terminology is not correct because I am kind of new to this theology stuff. I know there is a...
Jan17-11 03:49 PM
Chalnoth
24 7,370
Is CCC killed by BICEP2 or there is a way in which it survives?
Apr7-14 07:16 PM
Haelfix
2 741
During the (recently departed) matter-dominated era, the total mass of the Universe, including dark matter, is...
Dec30-09 05:34 PM
Marciano
13 2,368
The Hawking-Unruh temperature is given by the expression: \large T = \frac{\hbar g}{2 \pi c k} where g is the...
Mar17-12 09:15 PM
zhermes
1 1,147
Starting from any point in the universe, shine light in all directions; given infinite time has passed, will it have...
Jul13-08 07:03 AM
robheus
151 12,414
Suppose the universe is bounded and not infinite, would it require more dimensions for the universe to curve back upon...
Feb15-06 06:31 AM
Garth
20 3,056
I was interested in the region from the event horizon towards the centre of a black hole. That is, the region from the...
Apr29-08 11:28 PM
foolosophy
2 3,263
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 1,045
I am read the pag 190 of Dodelson bock, where use the following relation \rho_{DM}= \rho \frac{y}{y+1} . where y=...
Jun19-13 05:27 AM
cristo
6 905
Personally, I really don't buy it. To me, it seems fair more likely that either: 1) The universe is expanding but...
May7-10 03:44 PM
twofish-quant
43 4,337
This paper seems to say so http://arxiv.org/pdf/1210.1183.pdf, so does this mean heat death or the big rip is assured...
Oct27-12 11:55 AM
Chalnoth
20 6,833
As you know the AMS experiment is supposed to be releasing results that have import on the dark matter search, and...
Mar10-13 04:49 PM
d3mm
0 535
DO WE ALREADY HAVE EVIDENCE OF DARK ENERGY - OUR MANIFOLD? If LIGO I with itís 10^-21 sensitivity, VIRGO etc....
Sep15-07 12:43 AM
zankaon
0 1,396
Do theories of quantum gravity require that space-time is a lattice instead of a continuum? I guess this question...
Apr26-12 04:22 PM
Naty1
2 1,246
It is known that in result of the cosmological expansion the distances between galaxies increase according Hubble law...
May27-09 07:06 AM
dimilion
2 904
The LHC is supposed to create conditions similar to the big bang. Although energy densities, temperatures and other...
Mar24-11 03:36 PM
M. Bachmeier
6 1,349
Good people, As a 45 year old IT-PM, with no scientific / academic affiliations, can I ask, what I think should be,...
Mar26-11 05:20 PM
Chalnoth
35 3,631
imagine a photon (travelling with the speed of light) is moving straight towards a huge mass say 10^10 Msun. what will...
Jun25-11 05:33 AM
Drakkith
2 1,051
Hi, I have been trying to understand the nature of rotating objects within a galaxy, but with limited sucess. I am...
May31-12 05:03 PM
Lino
5 1,815
Here is an article about the Holographic Principle found on Wiki, then please read my comments below: If new...
Oct19-07 12:14 PM
setAI
2 1,813
Please help me with this question. Thanks
Mar27-10 05:32 PM
quddusaliquddus
2 1,425
Edit. The mass of the universe is divided thus. Dark matter = 26.8% Dark energy = 68.3 Ordinary matter...
Nov22-13 03:59 PM
Naty1
5 1,135
Heavier elements like gold, uranium etc. are formed at the end of a star's life. As the star explodes into a...
May11-14 01:09 AM
Yashbhatt
8 503
I have a question as to the actual nature of cyclic models of the universe (e.g. Roger Penrose's Conformal Cyclic...
May30-12 02:29 PM
_heretic
3 1,414
For simplicity I assume a flat radial FRW metric (with c=1): ds^2 = -dt^2 + a^2(t)\ dr^2 Now let us consider the...
May21-14 12:45 PM
Mordred
37 1,887
The backdrop against which cosmology is set is provided by the geometry of spacetime. As often pointed out in this...
Jul22-10 09:22 PM
spuce
15 3,188
There are two representations of blackholes that I see in the popular media. Could you help me find the answer to a...
Nov19-11 05:34 AM
Hjarloprillar
7 1,698
What do we know about black holes swallowing dark matter? Dark matter exhibits gravitational effects, right ? So it...
Aug20-10 12:40 AM
Radrook
49 6,306
the title pretty much says it all. i am just wondering if dark matter (which doesn't interact with light i believe)...
Oct21-07 07:29 AM
Garth
12 3,723
Do antistars absorb photons? I read Feynman's Book, "QED - The Strange Theory of Light and Matter", there a while...
Jun5-07 06:09 AM
Nasher
6 2,679
I was wondering, if dark matter (DM) halos are spherical in nature and increase in density as a function of distance...
May21-07 02:19 AM
Wallace
2 1,415
I have been working hard to get the Dark Matter exclusion plots. In most of the papers (arxiv:0808.3607), I found...
Mar1-14 07:26 AM
mfb
1 469
How has subatomic particle homogeneity changed since cosmological redshift Z=1000? How much have particles maintained...
Sep17-13 02:29 AM
Mk
11 1,761
How is dark matter distributed (as far as we know)? Let's stay with a single galaxy like the Milky Way. I heard...
May6-14 11:51 AM
Mordred
4 722
The universe is observed to be flat. This is due to its energy density, and also due to purported inflation. How do we...
Jan1-10 10:17 AM
twofish-quant
12 1,800
Hi all, this is my first post; apologies if it seems a bit basic, I suspect there's something fundamental I'm not...
Mar12-12 12:50 PM
Chalnoth
17 2,270
Hello all, I'll start out by saying that I am a fairly new space/cosmology enthusiast with no real background in the...
Jul2-10 04:39 PM
Ich
1 827
I am just a layman who read that the farthest quasars (based on redshift) are about 13 billion light years away. Is...
Nov30-10 05:17 PM
marcus
11 5,749

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