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Theoretical physicist from Vienna, Austria. My focus is the theory of strong interactions and its study via the AdS/CFT correspondence, but I am also interested in aspects of general relativity, particle physics and string theory not related to holography.


Jul
21
comment Maldacena's decoupling argument
@pinu: That depends on what you mean. The $S^5$ is actually quite important, since it determines the R-symmetry of the dual gauge theory.
Jul
21
answered D-branes in type II string theory
Jul
21
answered Dimensional reduction of SUSY theories
Jul
21
comment In string theory, are strings really just one dimensional?
May I add that it is important to realize that while branes are possibly higher-dimensional objects in string theory, they are not just generalizations of fundamental strings to higher dimensions, but that there is more to it.
Jul
21
comment Superstrings in the 10th Dimension
May I ask you where you got the idea that string theory emerged out of supergravity? Originally, string theory arose in an attempt to describe scattering amplitudes for hadrons, and only later was reinterpreted as a theory of (quantum-)gravity from which one recovers supergravity at low energy.
Jul
21
comment Maldacena's decoupling argument
@pinu: I have expanded my answer.
Jul
21
revised Maldacena's decoupling argument
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Jul
20
answered Maldacena's decoupling argument
Jul
12
comment Any interesting implications of a holographic black hole in a holographic universe?
From the context it is obvious that Nastase means "spacetime", as the latter word is also found in the first subtitle of chapter 2. People often say "space" when they are lazy or simply do not care about the distinction when the meaning is obvious from the context, but that does not mean they do not understand this simple point. This is purely about arguing semantics.
Jul
12
comment Any interesting implications of a holographic black hole in a holographic universe?
You have clearly misunderstood the concept and my first comment. As I said, there is no proper holographic description where the gravitational side of the principle corresponds to our universe. The AdS/CFT correspondence and its generalizations are commonly used to treat problems of four-dimensional quantum field theories, which are mapped to quantum gravity on an AdS space. This does NOT mean that this AdS space describes the spacetime geometry of our universe. I would suggest that you read some introductory literature, for example by Nastase.
Jul
12
comment Any interesting implications of a holographic black hole in a holographic universe?
The word "conjecture" basically just explains that it is not rigorously proven in a mathematical sense, there are tons of evidence that it actually holds true. Citing Wikipedia is not a good idea on such a matter, I would recommend you to consult scientific literature.
Jul
11
revised How are quadruple gluon vertices related to $SU(2)$ and $SU(3)$?
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Jul
11
comment Any interesting implications of a holographic black hole in a holographic universe?
Your first paragraph is ambiguous/misleading. It is indeed true that we lack a proper description of our universe in terms of a lower-dimensional theory. There is, however, a lot of evidence that the holographic principle holds true in the context of four-dimensional strongly coupled gauge theories, which are mapped to gravity in higher dimensions (see AdS/CFT).
Jul
11
answered How are quadruple gluon vertices related to $SU(2)$ and $SU(3)$?
Jun
10
answered Why is $U(1)$ special when defining global charges?
May
5
answered Understanding the AdS/CFT Correspondence
Apr
29
comment If you are only interested in deriving Feynman diagrams can you skip path integrals and just compute greens functions?
Could you please provide a reference on this operator?
Apr
29
comment If you are only interested in deriving Feynman diagrams can you skip path integrals and just compute greens functions?
If you ignore interaction terms, how are you then supposed to study Feynman diagrams containing interaction vertices?
Apr
27
revised Speed of sound in an inifinitely dense medium
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Apr
27
revised Speed of sound in an inifinitely dense medium
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