Where did the energy come from, for the big bang? Wouldn't this be a violation of law of conservation of energy?

I’m gonna go ahead and assume that if you can answer that question, you will probably find yourself named one of the greatest minds of our time.

One explanation for the energy is the Big Crunch scenario.

I don’t think it would be much of a stretch to say the law of conservation of energy always holds within this universe, with this universe’s physics, but not necessarily “before” it. In other words, I’m not so sure it applies to the Big Bang.

Obvious disclaimer: I am not a theoretical physicist. I’m not even a beta scientist.

I can’t remember hearing scientists say that there was “nothing” before the Big Bang. I have heard it said that there is no such thing as “before” the big bang, in that time and space had their origin with this event. I have also heard it said that it would be impossible to determine the exact nature of the “something”—the singularity—from which time and space expanded outward, because what we know as the laws of physics fail to apply under such conditions.

Infinity (time) over near-infinity (space). It didn’t “come from” anywhere per se, for it’s always been a way that the “system” of the universe interacts. It is a manifest of change, rather than an entity on its own. You do not have the different energies without matter/particles in constant change.

The big bang to me is only one state of the universe, before which you may have had another “big crunch” as per @mattbrowne ‘s response.

You could try to trace back where some energy came from by observing the changes of matter/space/physics around it. And at least account for the strong interactions (because, alternatively everything affects everything else, but to variating degrees, not noticeable by most of out observations and with such small effects that in the time window we are looking at, it makes not much of a difference. And then again, how far back can you look? Cosmologists and astrologists look at the past of the universe given the light we observe now (that has traveled vast distances to get here) – thus get a glimpse of some observable states from our point of view and given the occlusion – or hypothetically the limiting distance of light itself (interference etc).

Hope those are some useful thoughts toward beginning to answer your question :)

The big bang is a BIG theory covering the entire history of the universe. That’s a long time, and it is an interesting theory that possibly tells us something useful about cosmology. It’s supported by a mathematical model that is applicable under certain conditions and limits. The information the theory can tell us is useful to astronomers and can predict verifiable results that further our understanding of the universe.

What it will not do is boil coffee or tell us what happened before the big bang. Unfortunately.

hey i respect your efforts but guys shouldn’t one thing be declared as wrong think over my que and from the above answer the scientist say that there was no ’‘such’’ thing and such is refered to the universe and thats the place where everything exists

@golusinghania I think the issue lies with your understanding of the theory, and not with the theory itself. When all of space, time, energy and matter are all compressed into a single point, the laws of physics behave very differently. This stuff is hard for even genius minds to wrap their heads around, let alone people like myself.

If we can establish that accelerating expansion is an observation error, and that the current Universe will end in a Big Crunch, then @mattbrowne may have the answer. However all recent observations say the Universe is still expanding 13.75 billion years after the Big Bang, and that the acceleration is expanding. In that case, then a Big Crunch could only occur if the morphology of the Universe is very different than three-dimensional space as we conceive it.

Getting at your question another way, @Fyrius is right that as far as we know the laws of this Universe arose with or from the Big Bang, and we have no way of knowing what laws may have beeen extant before it. By the same token, since the Big Bang created the space-time we are in, before or beyond don’t make sense within the context of this Universe. And as @thorninmud noted, you will not hear serious astrophysicists saying that they know anything about what conditions and physical laws were before the Big Bang if there could even be a before. We can not observe further back than the original event horizon of the Big Bang singularity. So for now, when you hear anyone talking about what lies beyond that event horizon, they are either speculating or hearing directly form some supernatural force that actually can see that which cannot be seen..

thanks @gorillapaws and @etpro you both give me a bim hint to reach to the answer of my que. I will definatly follow you both and a big thanks to you once again

@golusinghania to be fair, it is not that easy to gauge a questioners understanding of scientific procedure from a short question. My own experience of astrophysics is that it is 98 percent mathematical modelling. The rest is mostly fairly fanciful conjecture with a dash of almost incomprehensibly vague measurements.

There’s a readable article here along the same lines