What happened before Planck time?

Answer 1

Planck time is the amount of time it takes one photon to travel the planck length, which is the scale at which typical ideas of gravity and space are invalid and quantum effects dominate.

One planck time after the big bang began is when the universe as we know it began to exist- the time after which gravity actually came into existence. It is approximately 10^-43 seconds. It is considered the shortest measureable period of time, just as the planck length is the smallest measurable distance.

An interesting facet of this is this: Let's say you wish to measure the position of something. You bounce a photon off of it to find it's distance. The higher the energy of the photon (the shorter the wavelength), the more accurate this measurement can be. If you provde enough energy to this photon so that you can determine the position of the object to within a planck length, the photon, when it strikes the object, a miniature black hole would be created, which would swallow the photon making the observation impossible.

This all sounds wierd but quantum mechanics is extremely wierd and very non-intuitive.

Answer 2

Planck Time Big Bang

Answer 3

Planck time is a certain era after time zero,about 10 to the minus 57 of a second.
Modern physics can't divide a second to less than that.
But the fact is,the first space-time pulse after time zero was about 10 to the minus 95 of a second after zero.
If time was longer than this the speed of light would be slower.
There would be other serious consequences associated with a longer time span.
The universe would be much smaller than it is,in fact the universe may not gotten past the first 30 billionths of a second,and may not have developed at all.
If the time pulse had been shorter,the quantum effect would have been less and the universe may have had difficulty producing hydrogen and the first stars..
The Planck second is millenia away from what is required to produce a universe.

Answer 4

'Before' Planck time??? I'm not even sure I understand the question. If you mean what was happening in the big-bang on a Planck time scale, time was just starting to 'unfold' and assume its rightful place as one of the fundamental dimensions of the new Universe.

Doug

Answer 5

there are many pet theories about this. none have any means of being tested.
but that all hinges if you put your faith into the big bang scenario. However there is no proof of a big bang to begin with.

competing theories to big bang. steady state universe. Brane theory. quantum foam theory. any of those theories Planck time is rendered moot.

So ask yourself this little mental exercise. Before time there was no-time. then time happened. so time had to start somewhere in no-time. but there was no-time before the Planck time. so it could not start. since ergo it didn't exist. great now you just proved you can't exist. Did you go poof? likely not. So what does this mean? Well for starters it doesn't rule out big bang. It just points a glaring oddity we don't have enough data to fulfill the answer. So we can only speculate. But it makes for interesting astrophysics.

Answer 6

Nothing at all, because there was no 'before' Planck time.

Answer 7

We don't know what caused our universe. Supposedly neither time nor space existed prior to the big bang. And that is a paradox. Because if there was neither time nor space, then there could not have been any random quantum fluctuations. They could only exist once some space existed. So for now, there is no valid theory even, for the origin.

Answer 8

Pre-Planck time?

Answer 9

do you meen befor time time was and always here or you saying a is time slowing down,or i have know what you saying