Big bang Definition and 916 Threads

I was arguing with someone who denies big bang cosmology. I presented him with the following evidences -Hubble's law -CMB -Abundance of helium -Existence of deuterium But apparently this did not convince him. Can someone point me in the direction of more evidences?

I asked this somewhere else, but I cannot find it any more (either deleted or removed by some staff). I hope I am asking the right question and in the right place here.Thanks 1 Is big bang accidental or inevitable? 2 I am sure I heard of news about quark collision experiement in order to...

I read from Victor Stenger's books that maximum entropy exists in black holes or singularities. So, at the Big bang, the universe had its maximum entropy. Does it mean that entropy has DECREASED since then? Stenger explained that since the universe expands, it has more space for entropy...

I'm not a physicist, in any way. But I've had this idea about the universe for a while, and I would like to get some feed back on it. I have this idea that the Big Bang wasn't necessarily all of the matter in the universe. That just like matter accumulates and will eventually reach a...

pre Big Bang universe "discovered"? This has got to be sensationalist journalism. Suirely, they mean a new hypothesis, not new discoveries. "New discoveries have been made about another universe whose collapse appears to have given birth to the one we live in today." From Science Daily...

LQG in the mainstream press "Glimpse of Time Before Big Bang Possible" string theory gets all the headlines, and perhaps, when LHC starts collecting data, justifiably so, but here's one for LQG http://news.yahoo.com/s/space/20070701/sc_space/glimpseoftimebeforebigbangpossible "To see...

I heard that the X-ray background and peculiar velocities provide evidence that leads scientists to believe in the Big Bang model. What exactly do they have to do with it?

I was discussing the Big Bang theory with a friend, but couldn't answer a question he asked. Why is it that people believe that the Big Bang is true? Is there any scientific proof to it?

Read this article about ekpyrotic model which is proposed as an explanation of big bang http://xploreuniverse.blogspot.com/2007/04/what-is-fundamental-thing-that-makes-up.html

The biggest "debate" I've seen on these cosmology forums appears to be "did the Universe, time, space and the whole whatevery actually begin with the Big Bang?" or "there is no scientific evidence the Big Bang was the beginning of the Universe, why should we believe it?" I haven't seen a thread...

What do you guys think existed before the big bang? This question has stumped me for years. No doubt it will never be answered with certainty. The theory is that space and time was created in an instance. I can not and never will be able to get my head around the notion that time and space...

Hello everyone, can someone clear up these Big Bang problems for me? As far as I know quantum physics is a set of physical laws and rules describing our universe. If so, how can we say the Big Bang sprang from a quantum fluctuation if there was no Universe (and hence no laws of quantum...

Can anyone tell me what the universe was before Bigbang? Thanks

In as few words as possible, could someone refresh my memory as to why in the Big Bang there was a slight excess of matter that survived the matter-antimatter annihilation? And is such matter just baryons, or was there remaining from the annihilation other forms of matter besides baryons?

Does anyone have information about a book by Rudy Vaas supposed to come out this year, called Beyond the Big Bang. The publisher is Springer Verlag. Vaas is Philosophy of Science professional who doubles as science journalist: writing popular articles for Bild der Wissenschaft (analogous to...

Why can we only explain the nucleosynthesis with the Big Bang and the Supernovas? Where can I learn more about this subject?

News article on Science daily. If the cosmic microwave background radiation was a remnant of the big bang fireball, galaxies should cast shadow on this CMBR. But this test seems to fail, as only 1 out of 4 galaxie clusters cast shadows...

I just had this crazy idea lately. Isn't it possible that both Big Bang theory and infinite universe theory are correct? Seeing how both time and space were supposedly created during Big Bang and the fact that they are closely related, isn't it possible that as you try to *go back in time*, time...

A new cosmological model demonstrates the universe can endlessly expand and contract, providing a rival to Big Bang theories and solving a thorny modern physics problem, according to University of North Carolina at Chapel Hill physicists. The cyclic model proposed by Dr. Paul Frampton, Louis...

Answers in Genesis is a well known young-earth creationist website that says the Universe is less than 6000 years old. I was referred to this article: http://www.answersingenesis.org/tj/v18/i2/echoes.asp" by a creationist whom I was debating with. Now, my major interest is in biology and I was...

Has the Planck era, inflationary era or other intervals of cosmology affected the fundamental theory of quantum mechanics? For instance, is QM defined at all before the Planck time? During the Planck era, are there any non-trivial applications of the wavefunction? Did inflation change just...

The link is a very interesting paper titled ``The Possibility of Curved Spacetime, Black Holes, and Big Bang is Less than One Billionth`` You can click at PDF after the webpage shows up or you can directly click the following link http://arxiv.org/PS_cache/astro-ph/pdf/0512/0512614.pdf

For a cause to effectively be examined, there must be a way to find its cause and its effects. A 'first cause' has no prior cause, thus logic can only deal with its effects, and not the first cause itself, as there is nothing before it to derive its attributes from. Evolutionary theory has prior...

Big Bang vs Big Collision?? I was watching Parallel Universes on the Science Channel the other night and they presented a theory where multiple Universes or Branes in the 11th Dimension collided and created our own Universe or Brane. Apparently the collision between two Universes creates...

I realize this question includes relativity, but I think it is more appropriate here than in that forum? [Tell me if I should cross-post it elsewhere; I'm new to this forum :)] I'm working on a paper based on reading material that doesn't address big bang cosmology directly, but rather...

If a black hole had the mass-energy of the entire universe, all mass and all energy, same mass-energy as the singularity that preceded the big bang, (energy was left out due to space) would that black hole explode in a big bang, as the big bang singularity did? If you had a black hole with...

Sorry if this is a repost, but I saw something on a science documentary show last night that completely surprised me. The show was on the Big Bang and evolution of the Universe, start to finish. It was on a show called Naked Science on one of the science channels on DTV, and it seems to do a...

Looking up at night I see the galaxy, stars and planets all rotating happily along and wondered, as to the source of rotational energy. As I understand there can be only one source, the Big Bang event. Can I conclude then, that the singularity was rotating at the time of Big Bang ...

Let me preface this by saying that I know very little about astronomy, but this is a question that has been bugging me for quite a while. I've tried looking it up online and in books, but I can't find it directly addressed anwhere. My question is that if the universe began with a single...

Would it be possible by comparison of expansion rates and directions at various points to back-extrapolate the location of the original Big Bang? Certainly in a local part of the universe, everything is expanding away from everything else with rates and directions as if the whole expansion were...

Was big bang a Black Hole Explosion? If the theory of the big crunch is right we can say that the big bang was a black hole explosion right? But can we say by now that the big bang a Explosion of aBlack Hole which contained all the matter we see today inside? :confused:

I have heard that nothing can overcome the light in speed, (that will say in vacuum) but when i read abot the big bang, the mass extended itself in a speed that was much faster than light. can someone explain this for me? And another question, can gravity make an object go faster than the...

Hi, I have a question... If I were to build a telescope that could produce images of things about say... 14 billion light years away... What would I see? According to the Big bang theory, shouldn't I just see a singularity and nothing else? Thanks.

i all ways wonder this. what existed before the big bang?

i am very new to this forum so i don't know if this posting is inappropriate in anyway. I had my only other posting removed so... with that being said, i am looking to better understand the implications of simultinaity as it pertains to the age and expansion of the universe. From the...

I often wonder how much our ancient ancestors, or at least the elite among them, knew about the origins of the universe. We tend to mock ancient accounts and call them myths. But how many of those myths may in fact be flowery, encoded or corrupted descriptions of the theories we know today...

Black holes and the "Big Bang" Hi guys. I'm pretty new to this forum and wanted to talk about something I have been thinking about for a long time. Please note that I've only taken 100's level College physics and am by no means an expert on the mathematics involved with black holes and FTL...

the big bang suggests that there was a huge energy density that exploded to create the universe my rather simple(and probably ignorant) questions are these... is the energies density consistent throughout? what would cause randomness following the explosion if it wasnt is it possible...

Can someone explain why the compton wavelength and event horizon are used to determine the uncertainty in what we can see if we were to look back in time to the big bang. (We can only see back to 10^-43 seconds after the big bang.) Here's a website that derives this time (Planck time)...

I'm having trouble here, will you help me out? They estimate the heat of the Universe at 1000 trillion degrees Celsius in a picosecond, nanosecond (or other fraction of a second). What body was hotter before that second to heat the universe to that degree? Or am I looking at that the wrong way...

this is a "connecting the dots" thread about two particular series of papers that I'm watching In one set of papers, Freidel et al identify a form of Quantum Gravity that is LATENT in (Feynman diagrams of) Quantum Field Theory. Latent means hidden, which is the word Freidel uses in the titles...

As I discussed with a friend's cousin, who is completing a Ph.D. in Astrophysics, he said that the ONLY evidence for the Big Bang was the seen redshift from the other galaxies around. Is he right, or is he wrong? If he is right, how can we base cosmology over a single, 'weak' proof like...

What do you think about it? Big Bang was the result of explosin of a super super masive Blackhole, details: According to one of the theories, this universe will end up with a black hole. So if we consider that, in the long future nothing would be left inside the universe other than the...

I do not necessarly see what this has to do with a confirmation of the big bank theory. On the surface I would view this as a confirmation of QMs. It simple says that ocassionally you have enough KE to flip a spin of from the basic ground state. Maybe the "intensity" of the radiation might...

this just out http://arxiv.org/abs/gr-qc/0602086 final sentence of conclusions: "...our results show that the quantum geometry in the Planck regime serves as a ‘quantum bridge’ between large classical universes, one contracting and the other expanding." words leading up to the above: "...we...

Hello, I think this is a good theoretical question (hypothetical question) to ask. What I am interested in figuring out is: the possibility of the following hypothesis, not whether it is rejectable or not. Is it possible?? With the term 'Empty Nest' the specific condition and location...

according to the BB theory, in the first millionth of a second the universe expanded at a rate many times greater than the speed of light, apparently it was able to do this because of the lack of phsical laws, if this is true how do we know that a millionth of a second was in fact a millionth of...

According to the Big Bang scenario, after the "explosion" , matter and radiation spreads, while the newborn space grows. My question is: This firstly emmited radiation (which I think was spread radially, right?) shouldn't somewhere in time be attracted back, due to the gravity effect? Does...

After the discovery of galaxy HUDF-JD2 is the big bang theory to be revised?

from when i was 10-11 years old, i have been told that there was a big bang and the universe has been expanding because of it. but my curiosity grew and wanted to know what caused it. but i was surprised to know that 'nothing' happened before the big bang. as i know there is a cause for...