A historical roadmap of theoretical physics
Nowadays: 1995-2000
Spin Foams , Nonperturbative strings,
BH radiation from strings, BH radiation from loops,
Strings-noncommutative Geometry.
Eigenvalues of area and volume
Null Surface Formulation . . . . . .
And « Quantum gravity phenomenology »
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Concluding remarks
So, where are we, after 70 years of research?
There are well-developed tentative theories, in particular strings and loops,
and several other intriguing ideas.
There is no consensus, no established theory, and no theory
that has yet received any direct or indirect experimental support.
/ Carlo Rovelli /
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About “ strings theories”
There are many string theories. And the growing catalogue
of string theories evokes trouble. Because one theory is better
than the other one, but at the same time each new theory brings
new problems. Therefore Lee Smolin wrote:
‘ . . . at least one big idea is missing.
How do we find that missing idea?’
/ Book: ‘ The trouble with Physics’ Page 308. by Lee Smolin. /
My conclusion:
It is impossible to find a foundation for uniting gravity
with quantum mechanics using string theories.
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