Search Results
| Search type | Search syntax |
|---|---|
| Tags | [tag] |
| Exact | "words here" |
| Author |
user:1234 user:me (yours) |
| Score |
score:3 (3+) score:0 (none) |
| Answers |
answers:3 (3+) answers:0 (none) isaccepted:yes hasaccepted:no inquestion:1234 |
| Views | views:250 |
| Code | code:"if (foo != bar)" |
| Sections |
title:apples body:"apples oranges" |
| URL | url:"*.example.com" |
| Saves | in:saves |
| Status |
closed:yes duplicate:no migrated:no wiki:no |
| Types |
is:question is:answer |
| Exclude |
-[tag] -apples |
| For more details on advanced search visit our help page | |
Results tagged with cosmology
Search options not deleted
user 34155
Questions about the origin, history, evolution and fate of the Universe.
1
vote
0
answers
15
views
How would heavier neutrinos result in a more rapid expansion of the universe and less clumpi...
I've read that the heavier neutrinos (allegedly) are, the MORE rapid the expansion of the Universe would have been and the LESS clumsy other, regular matter would be....
Shouldn't the opposite be true …
- 5,585
4
votes
2
answers
260
views
How far away are objects whose light will never reach us, because of the expansion of the un...
I thought I had read this question on Stack Exchange before, but now I cannot find it... In fact, I thought I had posted this question before, somewhere, on Stack Exchange...
I believe the answer wa …
- 103
1
vote
1
answer
118
views
Does the lower value of the Hubble Constant predicted by the Planck Satellite and now confir...
Is the dark energy part of the Lambda-CDM model (the 'lambda') still necessary if the value of the Hubble 'constant' is lower than that predicted by Adam Reiss and collaborators when they examined Typ …
- 4,885
0
votes
0
answers
26
views
Is the hypothetical '(Don) Page curve' of evaporating black holes equal in time, so to speak...
I have heard that Hawking radiation is slow at first, but rapidly increases when the black hole becomes much smaller... (I forget the formula...)
Does that mean that the second half of Page's curve, w …
- 5,585
7
votes
1
answer
149
views
What exactly is a 'gravastar'? How is it different from a 'regular' black hole?
The Wikipedia article on gravastar says that it has a 'regular' black hole metric (Schwarzschild, I presume?) on the outside, but a de Sitter metric on the inside....
What exactly does that mean?
Don' …
- 129k
12
votes
4
answers
6k
views
How can a black hole have a charge, or be charged?
So-called 'hairless' black holes (no-hair theory, or theorem?) , which is what real black holes are, can be described by just three characteristics: Mass, spin, and charge.
It is easy enough to contem …
7
votes
2
answers
2k
views
How long has it been since dark energy started to reverse our slowdown and accelerate the ex...
Or has it been as long as six billion years? Over the last few years I keep seeing longer and longer numbers...
Have researchers noticed something different recently? Or found a mistake in their pre …
- 2,294
8
votes
1
answer
2k
views
Why was the Cosmic Microwave Background (CMB) released at a blackbody temperature of 3000K r...
The redshift is known quite precisely from the theory, since a hot big bang model (the standard model of cosmology) predicts the point at which the plasma de-ionized to form neutral hydrogen. … (Screenshot)
The redshift is known quite precisely from the theory, since a hot big
bang model (the standard model of cosmology) predicts the point at
which the plasma de-ionized to form neutral hydrogen …
- 163k
17
votes
1
answer
3k
views
Why do cosmologists assume that inflation began shortly after the Big Bang, rather than at t...
Somehow, I have never come across an explanation of why cosmologists claim that the alleged inflation of the very early universe occurred not at the Big Bang, but very shortly afterwards (~10^-36 to 1 …
- 4,885
4
votes
1
answer
192
views
Could the universe expand forever even if there is no force (e.g., dark energy or eternal in...
Matthew O'Dowd specifically and repeatedly states in the PBS Space Time video called, "Why the Universe Needs Dark Energy", that even without taking an expansionary field into account an under-dense U …
- 4,861
1
vote
2
answers
390
views
What is a 'square' Kelvin degree? μ$K^2$? In terms of the cosmic microwave background's (CMB...
From what I have read and seen, the minute temperature fluctuations in the CMB are measured in microKelvin, or μK.
However, many charts and graphs show μK2, or 'microKelvin-squared'.
Do they simply me …
- 163k
1
vote
2
answers
190
views
Since the Hubble Constant changes over time (it's a variable parameter), why can't the confl...
Are the conflicting values from the 'early universe' (Planck) method and the 'late universe' (Distance ladder) method actually compatible? Since during the latter period of the universe 'dark energy' …
- 4,506
21
votes
1
answer
3k
views
Why doesn't dark matter clump strongly in the center of galaxies, since it doesn't feel eith...
Dark matter is described as being spread not only throughout a galaxy, but also around it in a halo of some sort that extends far beyond the visible parts of the galaxy...
In fact, dark matter haloes …
- 16.7k
1
vote
0
answers
108
views
Why do most astrophysicists believe the cosmic microwave background (CMB) provides the best ...
I frequently read that the cosmic microwave background contains the best overall evidence for the existence of dark matter, and conversely against alternative gravity theories like MOND.
However, I ca …
- 5,585
1
vote
1
answer
183
views
Do Einstein's ten field equations use 20 or 40 variables? (2 or 4 for each tensor equation?)
One site I came across says Einstein's 10 Field Equations use 20 variables, while another said 40.
There are four variables in spacetime - three for space and one for time, right?
But there are two in …
- 725