According to the current cosmological theories, it's the model that explains the early life of the universe, starting from a rapid expansion of hot and dense matter.
2
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2answers
177 views
Was Planck's constant $h$ the same when the Big Bang happened as it is today?
Was Planck's constant $h$ the same when the Big Bang happened as it is today?
Planck's constant :
$$h= 6.626068 × 10^{-34}\, m^2 kg / s,$$
$$E=n.h.\nu,$$
$$\epsilon=h.\nu$$
1
vote
1answer
104 views
Are there still Big Bang Gravitational effects
If all matter was concentrated at one point before the big bang, I assume that the gravity was at a huge scale. For a long time many believed that the universe would eventually collapse back upon ...
3
votes
2answers
118 views
Shouldn't LHC have used $p\bar{p}$ collisions, instead of $pp$ collisions, to study baryogenesis?
Baryogenesis is the physical process(es) that produced baryon antibaryon asymmetry in the early universe. That means, the laws that governed the bigbang was baryon-antibaryon symmetric.
On the other ...
1
vote
2answers
126 views
What's the evidence supporting 1 singular Big Bang? [duplicate]
Possible Duplicate:
What has been proved about the big bang, and what has not?
I love to dabble with science, I'm by no means a scolar in this field. One thing that haven't seen proven yet ...
2
votes
1answer
101 views
Reference request for low entropy big bang
There is a somewhat widely accepted argument that the second law of thermodynamics exists because the universe began in a low-entropy state. I'm writing a paper that mentions this (and must be ...
1
vote
4answers
160 views
Can cosmic inflation be explained by matter antimatter reactions?
The big bang theory proposes that equal amounts of matter and antimatter were created in the beginning. Shortly afterwards most of it annihilated. Could that have produced enough energy to drive ...
-2
votes
11answers
495 views
Are there any theories that explain the very beginning of absolutely everything? [closed]
Of course there's the theory of The Big Bang, and there are theories on what caused The Big Bang, but what was the cause of the very first thing that ever happened? What started every
I also won't ...
0
votes
0answers
29 views
Can neutrinos be the dark matter [duplicate]
Possible Duplicate:
How do we know Dark Matter isn't simply Neutrinos?
If there are primardian neutrinos and since they have some mass however low, could neutrinos form the dark matter ...
1
vote
1answer
2k views
Negative and positive energy and Hawking [closed]
I don't have any physics background (except the material we did in high school-long time ago).
I was watching a documentary with Stephen Hawking about whether God created the Universe and I could not ...
1
vote
1answer
89 views
Cosmic Background Radiation: How did planets form before the CBR could reach us?
I've understood that the Cosmic Background Radiation(CBR) is an electromagnetic wave that originated from the big bang. However, we now live on a planet which that is also originating from the big ...
1
vote
2answers
63 views
proportion of dark matter/energy to other matters/energy at the beginning of the universe
How will the proportion of dark matter/energy to other matters/energy be like at the momenets after the beginning of the universe (standard Big Bang model)?
0
votes
2answers
158 views
Big Bang Anybody? [duplicate]
Possible Duplicate:
Did time exist before the creation of matter in the universe?
on causality and The Big Bang Theory
I was recently watching a Discovery special on the Big Bang theory, ...
0
votes
1answer
46 views
observation and implied time since creation
I read on a post
Big Bang and Cosmic microwave background radiation?
We detect light from another 13 billion years ago does this mean that one billion years ago we could only detect light from about ...
2
votes
1answer
210 views
How is it possible that we see light from shortly after the big bang?
How can astronomers see light from shortly after the big bang? How did we get "here" before the light that emanated from our "creation"?
1
vote
2answers
209 views
How is Big Bang related to theory of relativity?
I'm not someone with good scientific knowledge, so if my question are weird, correct me.
I was reading about big bang and I came by the theory of relativity. Can someone explain the relation between ...
1
vote
3answers
138 views
Energy and Matter
I was watching a show about the big bang theory. They were saying that in the beginning all that existed was energy. After the big bang that energy transformed into matter which then started forming ...
0
votes
2answers
472 views
If randomness doesn't exist, how come the universe isn't a perfect sphere with predictable distribution of matter?
I'm presuming that the scientific community pretty much agrees that randomness doesn't exits, and that everything has a cause. Please correct me if I'm wrong, I've heard of quantum mechanics, but as ...
1
vote
1answer
210 views
spacetime expansion and universe expansion?
First of all, does the expansion of spacetime solely cause the expansion of universe?
Secondly, if spacetime is the sole cause, do objects(matter with mass) themselves expand?
Thirdly, by spacetime ...
3
votes
1answer
146 views
Current string-theory version of Big Bang
I always wondered what the description of Big Bang would be like in string theory.
How is it different from QFT version of Big Bang?
Thanks.
4
votes
5answers
3k views
How can something happen when time does not exist?
I saw this documentary hosted by Stephen Hawkins: www.youtube.com/watch?v=WQhd05ZVYWg
And if I didn't get it wrong, it says that there was no time before the big bang, time was created there.
So how ...
1
vote
1answer
302 views
How did the energy/entropy/volume/pressure/temperature relationship exist at the Big Bang and how did it evolve thereafter?
According to the current Big Bang with inflation cosmological model?
I was under the mistaken impression that there was very low volume, very high temperature/pressure, very low entropy and the Big ...
1
vote
1answer
154 views
Are there any theories or suggestions for how the multiverse came into existence?
I've just seen a documentary about the multiverse. This provides an explanation for where the big bang came from. But it leaves me wondering: how did the multiverse come into existence?
Because this ...
13
votes
4answers
327 views
Does the universe have a center?
If the big bang was the birth of everything, and the big bang was an event in the sense that it had a location and a time (time 0), wouldn't that mean that our universe has a center?
Where was the ...
2
votes
1answer
52 views
Could there be a sort of “Molecular Destiny”?
Let's say we start with the Big Bang. Every bit of matter started from this event. Therefore, given EVERY variable (every particle, movements of particles, weights, times, etc) and an INFINITE amount ...
5
votes
2answers
113 views
Why does the homogeneity of the universe require inflation?
They say inflation must have occured because the universe is very homogeneous. Otherwise, how could one part of the universe reach the same temperature as another when the distance between the parts ...
6
votes
3answers
159 views
Where does the light of the Big Bang come from?
I'm wondering whether the residual light of the Big Bang comes from one particular direction and what possibilities do we have to detect its position?
2
votes
1answer
36 views
Why do we need the concept of dark energy to explain the expansion of the universe?
Why can't the expansion of the universe be thought as the Big Bang itself still in progress? Why do we need to introduce dark energy? The Big Bang was powerful, and that explosion itself could still ...
8
votes
4answers
412 views
Did really everything begin with a state with very low entropy?
As emphasized by Penrose many years ago, cosmology can only make sense if the world
started in a state of exceptionally low entropy. The low entropy starting point is the
ultimate reason that the ...
6
votes
1answer
189 views
Was the universe a black hole at the beginning?
Big bang cosmology, as far as I understand it, says that the universe was super hot and super dense and super small. It looks like that all the current matter, seen and unseen, were compressed to ...
2
votes
1answer
1k views
What did Hawking mean? 'Time started at the big bang'. Book suggestions please [closed]
After writing down this question, I have come to realize that. What I really want is reading materials on the questions below.
Before the big bang there was no such thing as 'time' (Steven Hawking on ...
1
vote
2answers
190 views
How to concile flat spacetime and big bang?
After reading How do we resolve a flat spacetime and the cosmological principle? I still remain perplex.
Please excuse my ignorance and try explaining to me :
I thought that basically, when we ...
1
vote
1answer
231 views
Superluminal expansion of the early universe how is this possible?
Is this a postulate? I get the expansion of the universe, the addition of discrete bits of space time between me and a distant galaxy, until very distant parts of the universe are moving relative to ...
5
votes
5answers
2k views
Why was the universe in a extraordinarily low-entropy state right after the big bang?
Let me start by saying that I have no scientific background whatsoever. I am very interested in science though and I'm currently enjoying Brian Greene's The Fabric of the Cosmos. I'm at chapter 7 and ...
4
votes
1answer
22 views
Light years and redshift from our point of view. How can we see it?
So I was reading about GN-108036 this morning and for some reason I thought of something which I can't quite wrap my head around and make sense of. It's early morning so maybe coffee hasn't kicked in ...
4
votes
4answers
105 views
Could there be more universes?
In the documentary: "Curiosity - Did God Create the Universe (on YouTube)", theoretical physicist and cosmologist Stephen Hawking states that time did not exist before the big bang.
The first ...
7
votes
2answers
121 views
Is it possible to look into the beginning of the Universe?
If we currently can look into some of the furthest stars, actually seeing the past
Isn't it conceivable that given enough distance we should be able to see
Parts of the Big Bang? If the Universe is ...
5
votes
1answer
31 views
What would the universe look like if it started out without any irregularities?
(Warning! Newbie question coming up!)
Background
As seen on this picture of the cosmic microwave background (take from the Wikipedia entry on the very same topic) there exists irregularities in the ...
3
votes
2answers
204 views
Big Bang and Cosmic microwave background radiation?
One of the experimental evidence that supports the theory of big bang is cosmic microwave background radiation (CMBR). From what I've read is that CMBR is the left over radiation from an early stage ...
2
votes
3answers
234 views
Why every galaxy is moving away from every other galaxy on astronomical scale? because of an explosion or because of creation of space?
Why galaxies move away from each other in general on the astronomical scale?
Which answer is correct of the following?
It is because of the big bang theory, everything is just moving away from ...
2
votes
3answers
352 views
Does (it make sense to say that ) the universe has a center?
I was reading this page:
http://www.guardian.co.uk/science/2011/oct/23/brian-cox-jeff-forshaw-answers
and I found this sentence by Brian Cox:
That seems to imply that everything is flying away ...
2
votes
2answers
186 views
Frame of reference and big bang
I have read Brief History of Time in which he has wonderfully described the formation of universe. What is the frame of reference from which we are viewing the big bang? What is the frame of reference ...
2
votes
9answers
677 views
understanding time: Is time simply the rate change?
Is time simply the rate of change?
If this is the case and time was created during the big bang would it be the case that the closer you get to the start of the big bang the "slower" things change ...
2
votes
1answer
195 views
The relation between the speed of light and the Big Bang Theory
I would like to know how much of the Big Bang theory is dependent on the constancy of the speed of light.
P.S.: It might be guessed that I am asking this because of the recent CERN news.
Yes, of ...
1
vote
4answers
521 views
Atoms pop out of nothing/vacuum/pre-big-bang?
I saw a great documentary last night about 'nothing'. It's about vacuums, and how if you have a total vacuum atoms will pop out of nowhere! Pretty crazy stuff. Atoms literally coming out of ...
12
votes
6answers
664 views
How can it be that the beginning universe had a high temperature and a low entropy at the same time?
The Big Bang theory assumes that our universe started from a very/infinitely dense and extremely/infinitely hot state. But on the other side, it is often claimed that our universe must have been ...
5
votes
3answers
192 views
Creation of matter in the big bang
I appreciate your patience to my neophyte question. I am working on my dissertation in philosophy (which has nothing or little to do with physics) about the "problem of naming." Briefly what I am ...
0
votes
2answers
285 views
Does the Big Bang need a cause? [duplicate]
Possible Duplicate:
on causality and The Big Bang Theory
Asking here in layman's terms..
When theoretical physicsists discuss the origin of our Universe, the wider consensus appears to be ...
5
votes
3answers
422 views
How can a quasar be 29 billion light-years away from Earth if Big Bang happened only 13.8 billion years ago?
I was reading through the Wikipedia article on Quasars and came across the fact that the most distant Quasar is 29 Billion Light years. This is what the article exactly says
The highest redshift ...
0
votes
0answers
406 views
Was the Big Bang a result of a decayed white hole singularity? [closed]
From my understanding, the Big Bang is theorized to have been a result of matter ejecting from a decayed white hole space/time singularity.
...
5
votes
4answers
102 views
Why is there still radiation left from the Big Bang now? [duplicate]
Possible Duplicate:
Why can we see the cosmic microwave background (CMB)?
We all have seen evidence of radiation left from the Big Bang, but how is it still detectable? Why didn't it ...
