VoloScientiam Posted February 10, 2011 Share Posted February 10, 2011 Well, im somewhat skeptical on the theory of the Big Bang, because by everything i have heard, seen, or read, the gravity at the time everything were to explode outward would be so inconceivably vast that nothing could cause that to happen. Thoughts please. Link to comment Share on other sites More sharing options...
Spyman Posted February 10, 2011 Share Posted February 10, 2011 Extrapolation of the expansion of the Universe backwards in time using general relativity yields an infinite density and temperature at a finite time in the past. This singularity signals the breakdown of general relativity. How closely we can extrapolate towards the singularity is debated - certainly not earlier than the Planck epoch. The early hot, dense phase is itself referred to as "the Big Bang", and is considered the "birth" of our Universe. http://en.wikipedia.org/wiki/Big_bang The Big Bang is not an explosion of matter moving outward to fill an empty universe. Instead, space itself expands with time everywhere and increases the physical distance between two comoving points. Because the FLRW metric assumes a uniform distribution of mass and energy, it applies to our Universe only on large scales - local concentrations of matter such as our galaxy are gravitationally bound and as such do not experience the large-scale expansion of space. http://en.wikipedia.org/wiki/Big_bang Link to comment Share on other sites More sharing options...
alpha2cen Posted February 10, 2011 Share Posted February 10, 2011 Well, im somewhat skeptical on the theory of the Big Bang, because by everything i have heard, seen, or read, the gravity at the time everything were to explode outward would be so inconceivably vast that nothing could cause that to happen. Thoughts please. This is one of the best theory now. But I do not know some of them. After inflation, where does the high energy go to? Link to comment Share on other sites More sharing options...
ajb Posted February 10, 2011 Share Posted February 10, 2011 Well, im somewhat skeptical on the theory of the Big Bang, because by everything i have heard, seen, or read, the gravity at the time everything were to explode outward would be so inconceivably vast that nothing could cause that to happen. This is due to our lack of understanding of gravity and the other forces at such extreme conditions as encountered at or very near the "birth of the universe". It is a real mystery and a focus of a lot of work. The answer should lie in merging gravity with quantum mechanics, which has proved to be very difficult. Anyway, if we "fastforward" to just after the big bang our models seem pretty good and agree with nature on a lot of fundamental things. The big bang theory seems to be a very good idea. Link to comment Share on other sites More sharing options...
VoloScientiam Posted February 10, 2011 Author Share Posted February 10, 2011 Thanks Link to comment Share on other sites More sharing options...
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