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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...
Aug2-14 07:51 PM
marcus
493 167,538
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 45,796
For scalar modes \mathcal{R}_k originating in the Bunch-Davies vacuum at the onset of inflation, I have the following...
T 05:26 PM
thecommexokid
0 53
Can someone please explain to me why the universe must be expanding and not contracting? Here is my take on this. ...
T 03:12 PM
Bandersnatch
6 117
I love having discussions with my friends about cosmology, physics and just the universe is general but can someone...
T 10:51 AM
0zyzzyz0
13 386
Hi Guys, I have just started Modern Cosmology and please don't mind if the question is too naive. I wanted to...
T 05:30 AM
craigi
1 168
So the universe starts with an amount of matter, radiation, a fixed spatial curvature constant and a cosmic constant....
T 02:09 AM
Lapidus
14 386
If the bulk universe is infinite (IF it is), would mathematical physics have trouble describing it because infinity is...
Y 11:31 PM
Chalnoth
6 293
Hi Guys, Can anyone provide links, books which explain the mathematical background of the field theory that...
Y 09:48 AM
Chalnoth
1 210
Please, can anyone help to analyse fluctuations of density in De Sitter Space in case of long waves? Formulas and...
Sep12-14 07:29 AM
bapowell
1 163
A couple of questions came up from different people and I thought I'd respond here in case anyone else might be...
Sep12-14 06:56 AM
Jorrie
14 372
Iím learning about cosmology and Iím struggling understanding the size and shape of the universe. If the universe...
Sep12-14 04:20 AM
Chronos
8 438
http://physicsworld.com/cws/article/news/2014/sep/02/big-bang-ruled-out-as-origin-of-lithium-6 The hystory of BB...
Sep11-14 03:24 PM
TrickyDicky
4 278
Planck dust modeling has been released http://arxiv.org/abs/1409.2495]. It appears to be consistent with the...
Sep11-14 04:37 AM
Garth
1 280
Hi everyone. I'm new to this forum...I just wanna make it clear that I'm an engineering student, thus I don't wanna...
Sep11-14 03:21 AM
Domenico94
10 387
say you fell beyond the event horizon of a black hole can another black hole passing close enough pull you out?
Sep11-14 12:01 AM
PeterDonis
20 580
Hello Everyone, This is my first post, I hope I've picked the right forum for this question. Could a black hole...
Sep10-14 11:15 PM
Nugatory
6 262
Forgive me if this is a foolish question but, what caused the super force in the early universe to split into the weak...
Sep10-14 04:49 PM
Chalnoth
9 494
Has anyone here ever asked these questions about the balloon analogy? 1. If the universe actually was the 3D...
Sep9-14 03:34 PM
Drakkith
34 676
Could the universe be expanding wave fronts and the fundamental particles of matter be the particle manifestation of...
Sep9-14 02:11 AM
Chalnoth
2 249
So the universe is expanding, rather space is expanding. By expanding we mean space is coming into existence at all...
Sep8-14 10:30 PM
PeterDonis
7 295
Conventional Cosmology would explain greater than c recessional velocities of the nebula as a non-problem regarding...
Sep8-14 02:35 PM
PeterDonis
14 739
I originally posted a thread regarding de-sitter spaces, Poincare recurrence theorem, and statistics. My main...
Sep8-14 02:04 AM
Chalnoth
1 188
I am currently reading "Our Mathematical Universe" by Max Tegmark. From the book I learned a couple of things I find...
Sep8-14 01:59 AM
Chalnoth
9 312
I've seen the example when people say the universe is expanding like the surface of a balloon. You have dots on that...
Sep7-14 06:18 PM
Drakkith
6 336
The multiverse is a theory that the are countless universes. What is the evidence for the existence of the...
Sep7-14 03:04 AM
julcab12
39 1,573
Is Supersymmetry still viable in cosmology, given that so far no supersymmetric particles have been found. From...
Sep6-14 04:19 PM
Chalnoth
6 310
The Big Bang is often associated with the concept of a singularity. A singularity is defined as a point in space-time....
Sep6-14 08:31 AM
Incnis Mrsi
5 572
I've been working with NFW Dark Matter Halos recently. This is a particular density model for the halo developed by...
Sep5-14 10:36 AM
phyzguy
3 191
I am curious to know if it is theoretically possible for the origin of the Big Bang to have been the energy released...
Sep4-14 04:46 PM
PeterDonis
13 490
I am at the lowest level of the spectrum when it comes to this subject, but this has always raised some questions for...
Sep4-14 06:27 AM
Bandersnatch
2 276
Do white dwarf planets ever die and eventually there will be no remains of the sun? What will happen to the gas giants...
Sep2-14 01:22 PM
Drakkith
17 916
This paper; http://arxiv.org/abs/1408.6248, Constraints on gravity and dark energy from the pairwise kinematic...
Aug29-14 04:37 AM
enorbet
1 359
Recently reading the Scientific American article The Black Hole at the Beginning of Time, which at first glance made...
Aug29-14 04:14 AM
enorbet
5 388
Just been looking around for any good resources or databases which show history of stars in the universe. I have...
Aug28-14 03:05 AM
nick1o2
4 408
Is it possible that our universe is just one of more universes and that our universe just appears to be expanding...
Aug27-14 04:44 PM
mfb
5 532
hey all! I have just finished processing the data of an n-body simulation (RAMSES code was used to do the simulation...
Aug27-14 03:57 PM
Greg Bernhardt
1 478
All - my first post, and as a lay person interested in quantum physics, forgive me if my questions are naive or...
Aug27-14 04:18 AM
phinds
9 431
Brown dwarf galaxies are, i think the coldest systems in the universe, If they continue to loose heat energy they must...
Aug27-14 03:02 AM
Chronos
4 424
We know that a photon has no mass, but has relativistic mass - which means in theory, a photon will have a...
Aug27-14 12:10 AM
Chalnoth
2 404
I ran a search and didn't see anything posted recently, at least, on the current thoughts behind the zero-energy...
Aug26-14 09:58 AM
PeterDonis
3 494
I've always been curious about about the big bang because (from what I've read) it's a point we're not able predict...
Aug25-14 01:49 PM
Drakkith
7 519

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