It is considered that gravity separates from other three interactions after plank epoch i.e. before GUT epoch; why it is not after electroweak epoch i.e. where is the technical mismatch?
That's not known. From the period of inflation onwards gravity is classical.
There's no mismatch at the electroweak scale.
Dear Mohammad,
As Stam has told you there is not an answer to your question from the cosmological point of view. But the main reason is that we have not a theory which can unify GUT theories with gravitation. What is assumed is that after the Planck epoch the gravitation was the first interaction to appear and the "quantum gravity" could be the important interaction at those times. In the inflactionay epoch where the Universe was cooled at great rate (supercooled) due to the sudden expansion destroyed the GUT and the strong interaction separates from electroweak. Around the picosecond the remaining W and Z bosons decayed quickly, and the weak interaction became a short-range force allowing to be separated energetically from electromagnetism. But the usual electromagnetism that we know is much older because this plasma was effectively opaque to electromagnetic radiation due to Thomson scattering by free electrons, as the mean free path each photon could travel before encountering an electron was very short. The recombination age happened, i.e. the electrons and protons could be binding to form hydrogen atoms and to create the cosmic microwave background which is the main information supporting the Hubble law.
The Planck epoch is included well within the first picosecond of time in which the known laws of physics do not apply according to Inflation theory. Accordingly gravity was the first force in effect thereafter, followed by the strong, weak, and electro-weak forces in that order, followed by the GUT epoch. The basis for this is the proposed math of Inflation. Of course there have been a number of different Inflation proposals but all, by their mathematics, propose this order of application of forces. If one proposes a different order of application then one must propose different physics and still another theory of Inflation. Are any of the Inflation theories correct? The Big Bang model is presently dependent on the validity of Inflation in one form or another as a foundation hypothesis.
Others above have more detail concerning present theory and hypotheses.
It is a very interesting and gut issue.
Basically nobody really dont know what did happen in this periode .
All theories are based upon our knowledge to particle physics and is our best estimate and guess . It means we have to be very careful coming up with an exact theory and banish new way of thinking.
Kurt Wraae
Dear Mohammad
It is perhaps the most fundamental question in Cosmology today.
All that is explained by Forrest Noble is correct. I think it is a
prioriy to develope further Quantum Gravity and Quantum Cosmology.
I mean, the answer is necessarily of "quantum fluctuation" nature.
Eduardo L. González.
Not to mention the fact that there isn't even a GUT at all-it's not, yet, known, how the strong interactions become unified with the electroweak interactions. So there isn't any ``GUT epoch'', in fact, that can be clearly identified.
“…Not to mention the fact that there isn't even a GUT at all-it's not, yet, known, how the strong interactions become unified with the electroweak interactions…”
as well as the electroweak “UT” with rather non-zero probability doesn’t exist in the reality; that [EM and weak forces] are quite different fundamental Nature forces; when there is no any real necessity in their “union”; and further in “GUT”….
Cheers
We introduced a series of new energy sources SU(6), SU(12),..... etc.
For details please read my all articles.
another question is if the separating process (say breaking symmetries) itself is symmetrically!? case not: one has not to handle by using symmetry!
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