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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
493 165,459
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 44,603
In other words why high redshift data is necessary for estimating the acceleration of universe?
Apr23-11 05:40 PM
Chalnoth
18 2,693
It takes an infinite amount of time for any particle to cross the event horizon of a black hole, from our point of...
Apr22-11 03:13 PM
Limitless777
16 2,859
We are all living on a big round ball of rock that circles (along with other balls of rock) a large ball of fire ...
Apr22-11 01:12 AM
phinds
8 1,662
I am just trying to get a feel for the general consensus on whether not not time was "created" in the Big Bang,...
Apr22-11 01:07 AM
phinds
8 1,530
I have recently been studying cosmology in my free time, but I came across something that strikes me as rather odd....
Apr21-11 07:03 PM
phinds
38 6,092
:surprised The multiverse is a theory in which our universe is not the only one, but states that many universes exist...
Apr21-11 06:35 PM
phinds
3 1,219
I lack the mathematical skills to determine if this idea is plausible. Maybe somebody has already been down this road....
Apr21-11 02:04 PM
George Jones
48 5,216
In my thread regarding the telescopic detection of antimatter, it was concluded that we cannot discern anti-matter...
Apr21-11 07:56 AM
Chalnoth
18 3,619
Just as a note I am new to these forums and this is my first post after reading for a little while, I have no...
Apr20-11 02:59 PM
Chalnoth
10 1,523
I am doing a project in school and am looking up different cosmological models to research. I have found Steinhardt...
Apr19-11 10:31 PM
cansay27
2 1,341
For space to expand is it just able to 'stretch' to a larger size or must newly created space units be added?
Apr18-11 06:33 PM
dm4b
12 2,925
Has anyone read and digested "Alternatives to dark matter: Modified gravity as an alternative to dark matter" by Jacob...
Apr18-11 06:34 AM
rhody
22 3,458
I have it on good authority that the universe is rotating, and rotating about ALL its axes simultaneously and...
Apr17-11 12:24 AM
Imax
82 9,741
Hi, this is my first post, so if it's in the wrong place please let me know. I'm writing a bit of fiction, more...
Apr16-11 11:34 PM
Misericorde
3 1,366
I have spent most of my life in a cave as far as knowledge about the universe. My math skills are poor. My brain cells...
Apr16-11 08:17 PM
marcus
5 859
I doing research on the state of the universe before and after Inflation for a science fiction book im writing. In...
Apr16-11 04:15 PM
bapowell
25 2,998
The Hubble law v=Hd is basic to Cosmology. Among other good things, it teaches us an absolute criterion for motion and...
Apr15-11 05:03 PM
Drakkith
3 969
constraining dark matter and dark energy with sunyaev-zeldovich effect. need help on this topic
Apr15-11 08:18 AM
as_if_iqbal
2 1,110
whenever i think about the age of the universe compared to the size of it i get frustrated. how can a 50 billion+...
Apr15-11 03:06 AM
Haelfix
19 3,180
What would happen if we had no matter or radiation or dark energyand only had curvature? How would this effect...
Apr14-11 06:35 AM
Chalnoth
13 1,292
What is everyone's opposition to the anthropic Principle? Is it not an application of deductive logic at it's purest...
Apr14-11 12:35 AM
Haelfix
28 3,978
I say it is finite. That is, if we agree that the speed of light is constant irrespective of its surroundings. ...
Apr13-11 08:12 AM
Tanelorn
12 4,266
Almost all planets in a multiverse with eternal inflation will be much younger than our earth. Almost all conscious...
Apr12-11 01:43 PM
offroff
132 13,229
OK, I'm not an expert in cosmology but I'm quite curious about it. Current observations tells us that the universe is...
Apr11-11 12:11 PM
marcus
3 1,071
What will be happening 10^(trillion) years from now? Sorry if this is posted in a wrong section.
Apr10-11 08:57 PM
Tanelorn
12 2,084
Is the vacuum energy density, in case it exists wich is the mainstream view, supposed to be continuously varying...
Apr10-11 08:56 PM
StateOfTheEqn
18 2,919
Alright, this is a subjective question since I think a person would have to be omniscient or nearly so to know answer...
Apr10-11 07:13 PM
thiazole
23 2,513
Hi. Went to a lecture by Brian Greene a few days ago. He started his talk by discussing the logical consequences of...
Apr10-11 03:02 PM
bcrowell
23 7,095
Apologies for the confusingly worded title; i was trying to keep it short. If the universe reaches a state of...
Apr10-11 03:28 AM
1dominator1
18 4,609
Has anyone yet asked a computer to calculate the chance of a Big Bang eventually forming thinking modern humans (e.g....
Apr9-11 09:56 PM
andrewkirk
11 3,719
Are inflation and expansion different phenomena and if so what is different about them. Both terms seem to refer to...
Apr9-11 09:09 PM
andrewkirk
8 3,365
Build a Dyson sphere around a black hole (this is a thought experiment), so no more mass "falls in". Line the sphere...
Apr9-11 07:11 PM
Nabeshin
7 1,625
An important component of the total entropy is the entropy of the gravitational field. There have been various...
Apr9-11 03:44 PM
StateOfTheEqn
22 5,111
I am watching a lecture by Susskind on his book The Cosmic Landscape. And he is going on about how "tuned" and...
Apr9-11 02:05 PM
Duderonimous
7 9,600
I am interested in black-holes because, even though I have no education to speak of and somebody here don't like me...
Apr8-11 09:35 PM
korben dallas
20 2,764
I recently made a partially tongue-in-cheek remark on this board about cosmology being a bit like religion. I thought,...
Apr8-11 05:54 PM
jtbell
22 3,891
Are you confortable with the demonstration in page 19 of Introduction to Modern Cosmology - A. Liddle ? My problem is...
Apr8-11 02:24 PM
edgepflow
1 877
I can accept that spacetime has no substantial aspect to it because for General Covariance (Diffeomorphism Invariance)...
Apr8-11 08:34 AM
rogerl
14 3,084
Hello! In which textbooks about Cosmology may I find information about the constitution of the cosmos and also about...
Apr6-11 07:54 PM
edgepflow
3 1,502
The rubber-sheet model of gravity pictures gravity as the effect of hollows in space-time due to the mass of an...
Apr6-11 08:13 AM
Arch2008
2 1,003

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