[Marko]

Cosmological constant,strength of the gravity, strength of the electric force,amplitude of irregularities in the cosmic microwave background,number of spatial dimensions,relative density of the universe,ratio of hydrogen that converts in helium via fusion in the Big Bang - they are all constants in our universe. But before our Big Bang, according to the Multiverse theory, this numbers could have been different. In fact, by pure accidents and randomness, they could govern a infinite number of „exotic universes“,with this „exotic laws of nature“..My question is : are the values of this constants deductable to some finite interval ( like the temperature - it has its min.( Gibbons-Hawking temperature) and max.(Planck temperature) because after this points there is no significant difference in the behavior of the particles ( at least I think so)). Can we apply some similar theory on this constants? Maybe a detailed computer analysis ,simulation could give some answers? If this is so,if we could deduct them to some finite interval,I think we could conclude that there is finite number of combinations of laws of nature in the Multiverse, extremely huge number (billions of billions), but still finite.Then this billion of billions laws of nature could be explained by the billions of the mathematical solutions in the string theory, which are used to describe collisions between strings which may lead to the Big Bang. This would clarify a lot of things to us,it would definitely help us to understand better our position and future in the universe.

I am aware that there is a lot of speculations........ but do we have a choice?

I will appreciate any answer or idea!


Regards!
Marko

[Guille]

I think some do have max and min, a sort of range of value, but others don't, they have infinite possibility. For example, the constants that are physical properties, must have a max value and a min, imagen the constant which is the energy of a photon, well that could have been bigger or small, but there is a range between to min-max points. But for example, the constant which is the total energy of the universe (int he hypothetical case that it is either ana isolated system or the nergy can't remove or enter from7to universes) could be any value at all.

We should not forget also that many constants, actually practically all, are connected and derived form equations in which there is 1 or other constants, so the value of the constants is interrelated and so they could nto be each of any ammount randomly.

[michellemfry]

Isn't the definition of a constant such that no matter what you do to it, it doesn't change?

[michellemfry]

Marko, do you believe we have a choice?

[Marko]

Take for an example the cosmological constant,which determines the acceleration of the universe. Larger the constant,sooner we are in the Big Freeze,and if the constant is negative,sooner we are in the Big Crunch.I think that there is some min. and max. because at some extremely huge positive value of the cosmological constant there would be immediate Big Freeze, and at certain negative value the universe would have contracted violently into a Big Crunch.After this points, I think,there would be no extra-effect on the particles because they already reached points of immediate B. Crunch and B. Freeze.

So, maybe some constants can not be deducted on finite interval directly,in the theory,on the paper. But when in real world,interrelated with other constants and perhaps with the properties of the particles (as in my example),we could indirectly deduct them on some finite values.Extremely large intervals, but finite. Exception of this „rule“ would probably be the total amount of the energy in the universe.I wonder, could we do some useful speculations about this total amount of energy?

Is this the right way thinking?

Regards!

[Guille]

No, we can't make good enough speculations about the universe's total energy, at least no good enough to include in equations.l But we sort of can do something:
1. Get avarage samples of the universe that we can investigate from telescompes. Some areas with suns, others with planets, most with nearly nothing... The amount of samples of each kind have to be correspondance to the ration of the amount we believe there is in the total universe.
2. Measure the energy in those places. Multipy it by how many times we think there are of each sample in the universe. Add it all.

The problem is that we have generalized, estimated and avaraged. These three mathematical workings are part of statistics and have no real correctness.

[Marko]

Originally Posted by michellemfry Isn't the definition of a constant such that no matter what you do to it, it doesn't change?

That is correct, and this works in our universe,from our Big Bang. But I tried to go step further,beyond our Big Bang, and at the moment, Multiverse seems most plausible solution (at least some variation of Multiverse). There is a speculation that our constants could have been different, and if other universes are existing,these constants may have been different in them.

[michellemfry]

Do you think that we will finally traverse to another universe, possibly through a wormhole in space and time? Possibly that time travel is there in another universe, and those new constants are discoverable. Perhaps universe to universe is easier than travel within one universe alone. After all space is expanding against something, isn't it?

[Marko]

Originally Posted by <<>> No, we can't make good enough speculations about the universe's total energy, at least no good enough to include in equations.l But we sort of can do something: 1. Get avarage samples of the universe that we can investigate from telescompes. Some areas with suns, others with planets, most with nearly nothing... The amount of samples of each kind have to be correspondance to the ration of the amount we believe there is in the total universe. 2. Measure the energy in those places. Multipy it by how many times we think there are of each sample in the universe. Add it all. The problem is that we have generalized, estimated and avaraged. These three mathematical workings are part of statistics and have no real correctness.

Yes, and these predictions are that 73% of the total energy/matter content of the universe is in the form of dark energy,23% dark matter, and rest goes on the regular matter.Of course, big deviations from this values are possible.

[Marko]

Originally Posted by michellemfry Do you think that we will finally traverse to another universe, possibly through a wormhole in space and time? Possibly that time travel is there in another universe, and those new constants are discoverable. Perhaps universe to universe is easier than travel within one universe alone. After all space is expanding against something, isn't it?

I think that in theory, space/time travels through wormholes are possible.But in real world,no matter how tehnological advanced civilization is, they will face series of extremely big obstacles.
So, I dont think we will ever be able to leave our universe,survive this highly speculative trip,and find ourselves in this other universe.
However,good understanding of the physics of complete Multiverse might improve our knowledge about the world,and our position and future in the universe.