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Cosmology

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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
493 166,623
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 45,224
If a small round black hole is traveling normal to the center of the major plane of a larger toroidal black hole, is...
Sep28-13 09:32 PM
Drakkith
34 11,696
Suppose space is expanding in the universe, then there must be void outside the universe. If this theory is true, what...
Sep28-13 02:36 PM
D H
7 1,298
Planck CMBR data...
Sep27-13 04:00 PM
mfb
6 1,382
Are gravitons and gravitational waves analogous to photons and EM radiation?
Sep25-13 08:28 PM
Drakkith
6 1,853
Not everyone likes the idea of Universe ​​created from a point singularity, so recently grows in popularity the cyclic...
Sep24-13 09:12 PM
bapowell
3 2,880
I'd just like to preface by saying that I'm not in any way an expert on high-level physics, but I would like to think...
Sep24-13 09:21 AM
Chalnoth
7 2,328
A short but interesting way of using the CMBR to test the quatization of gravity, what do you think ? Lawrence...
Sep23-13 04:29 PM
mfb
1 974
This is a phrase I keep seeing dicussed in cosmology papers, can anyone give a summary of what "Galileon cosmology"...
Sep23-13 08:59 AM
skydivephil
2 932
Dark Energy is said to be present in order to drive the observed acceleration of the expansion of the universe and...
Sep22-13 12:50 PM
Astronuc
9 2,035
http://arxiv.org/abs/1309.1487 Out of the White Hole: A Holographic Origin for the Big Bang Razieh Pourhasan,...
Sep20-13 12:41 PM
Chalnoth
8 2,621
Hi, Are Einstein's field equations without the cosmological constant scale invariant? If so does the addition of...
Sep20-13 07:17 AM
TrickyDicky
10 1,586
One version of the multiverse suggests that our bubble universe came from a progenitor universe and that our universe...
Sep20-13 05:05 AM
skydivephil
5 1,187
It could be possible for a driven vacuum bubble (like an Alcubierre drive,assuming that it could be possible to...
Sep19-13 01:41 PM
Chalnoth
1 931
Is the expansion of the universe relative to our clocks and rulers? If so, it seems correct to include relativistic...
Sep19-13 01:42 AM
Romulo Binuya
20 3,550
So I'm reading this book called "Origins" by Neil Tyson and in the beginning of the book he was talking about matter...
Sep18-13 10:32 PM
jfizzix
3 1,161
I have a question about the interaction between photons and leptons prior to recombination I understand that once...
Sep18-13 10:03 PM
Drakkith
1 828
I was looking at the wikipedia article about cosmic inflation (you know, the first 10-32 seconds). It says that an...
Sep18-13 08:30 AM
bapowell
12 1,664
so, many shows on tv today that keep suggesting our universe is expanding. is it really? 1. if you can say "it is...
Sep18-13 06:35 AM
DaleSpam
104 27,460
Hi All, I was just wondering why some galaxies look spiral (e.g. the milky way, andromeda, etc)? Is there a proven...
Sep18-13 12:26 AM
Chronos
6 1,098
What is frame dragging?
Sep17-13 10:50 AM
WannabeNewton
10 1,479
In the Glossary of his 1997 book, THE INFLATIONARY UNIVERSE, Alan Guth has this to say: OK so far, even...
Sep17-13 08:03 AM
Naty1
4 1,121
How has subatomic particle homogeneity changed since cosmological redshift Z=1000? How much have particles maintained...
Sep17-13 02:29 AM
Mk
11 1,763
From WIKI, In February 2007, GRB 070201, a short gamma-ray burst, arrived at Earth from the direction of the...
Sep16-13 02:06 PM
mfb
1 783
Forgive me if this is posted in the wrong section, but it relates to the compact heavies of the universe. ...
Sep16-13 08:09 AM
Damo ET
4 1,178
The IceCube detector in the deep ice at the south pole has seen two instances of 1015 eV neutrinos. These are said to...
Sep15-13 12:07 PM
marcus
20 2,818
I was thinking that "eternal inflation" model deals nicely with the problem of the beginning of the universe. If I...
Sep14-13 03:46 AM
Dmitry67
9 1,558
Hi Could you comment on Big Snap scenario briefly mentioned by Max Tegmark on page 12 (and I can't google more): ...
Sep14-13 03:41 AM
Dmitry67
4 1,276
My friend keeps on harping on this sort of stuff. He says that there is a gravitational pull from other universes...
Sep13-13 10:19 AM
George Jones
120 22,437
Space: So far for me it's 3D along with Time T. say 3D+T=4D (spaceTime), from the bigbang we have considered Time (t...
Sep13-13 07:48 AM
ZapperZ
56 16,405
Hi. I read some basic cosmology where it is always said that density fluctuations, pertubations can be described in...
Sep12-13 02:08 PM
Chalnoth
7 1,067
Sorry to harp on the same subject but here's a point of view - without a reasonable explanation of why galaxies are...
Sep12-13 01:51 PM
Mordred
14 1,168
Hello everyone. I was just reading Ian Stewart's "Concepts of Modern Mathematics". In the end of the first chapter he...
Sep12-13 06:12 AM
andrewkirk
11 3,121
The cosmological constant (Ʌ ) is equated to dark energy and has units of energy/volume. Why have I read that Ʌ...
Sep12-13 04:01 AM
Devils
9 1,333
Hi all, first post, just a mechanical engineer with an interest in theoretical physics. I have a few questions about...
Sep11-13 10:08 AM
DennisN
10 1,494
The world seems to me to be rather arbitrary. I don 't know if people feel the way I do. Scientists apply for...
Sep11-13 09:10 AM
Dmitry67
5 2,145
I have been trying to pin down a precise definition of large-scale homogeneity, in the context of saying, per the...
Sep10-13 09:22 PM
Chronos
13 1,784
What are the current theories as to the source of the new space that accounts for dark energy?
Sep10-13 06:46 PM
andrewkirk
20 2,731
The Schwarzschild equation for a black hole's event horizon is rsh = 2GM/c2 or (1.48 x 10-27 m/kg) x M. Thus, the...
Sep9-13 09:45 AM
timmdeeg
10 1,693
greetings gentlemen, i found this interpretation of red shift observations interesting:...
Sep8-13 11:53 PM
Drakkith
7 1,842
In the interest of broader participation, feedback, transparency etc, maybe we can have (in regular cosmo forum) a...
Sep8-13 04:47 PM
marcus
0 618

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