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May
25
comment Was TP Singh right to say that a theory of quantum gravity necessitates the Copenhagen Interpretation?
The Copenhagen interpetation is a "subjective collapse" theory, in which the wavefunction isn't a real thing, it's more like a probability distribution, a device that makes predictions, and the "collapse" is just the modification to the wavefunction that you make when an observation gives you new information.
May
25
comment Was TP Singh right to say that a theory of quantum gravity necessitates the Copenhagen Interpretation?
I just made a bunch of comments, I will try to say it again more compactly: The question, as stated, misrepresents Singh's position. Singh doesn't mention the Copenhagen interpretation at all. He offers a choice between two types of "realist" theory, many worlds, and an "objective collapse" theory in which the wavefunction spontaneously evolves into special eigenstates because of nonlinear dynamics.
May
23
comment What is the meaning of the concepts of “operator mixing” (and anomalous dimensions)
But it seems clear that the original question was one capable of drawing a completely satisfactory answer, from someone who really knows the subject and was willing to review the basics a little.
May
23
comment What is the meaning of the concepts of “operator mixing” (and anomalous dimensions)
I'm not competent to answer the question properly. It seems like operator mixing is about extra operators introduced by renormalization counterterms, and you have a square matrix of RGE parameters because it's really about a set of operators, where all the others arise as counterterms when you start with any one of them (so the entry Mij in the matrix would be, parameter pertaining to counterterm j when you start with operator i) ... but I got all that from Scholarpedia.
May
21
comment What is the meaning of the concepts of “operator mixing” (and anomalous dimensions)
I disagree with the closing of this question. It asks for definitions of terms, it mentions an equation in an article as an example of something to understand better, and it asks if they are known under other names. The upside of leaving it open is that someone might write an informative answer. What is the downside?
May
16
comment How can string theory work without supersymmetry?
Actually, the SO(16) x SO(16) string in that paper might already be an example of the type 0 string? Anyway, one thing to note is that some of these "nonsusy strings" still have a type of susy somewhere, e.g. on the worldsheet but not in spacetime.
May
16
comment How can string theory work without supersymmetry?
Along with the type 0 string, arxiv.org/abs/hep-th/9707148 is another example.
May
15
comment What are the implications of the Nesvizhevsky experiment and followup experiments with ultracold neutrons?
Technically they weren't quantum gravity experiments, they involved quantum mechanics in a gravitational field, which is different because the gravitational part can be treated classically.
May
13
answered Why should SUSY be expected naturally?
Apr
25
answered A Game Of The Number Of Space-Time Dimensions
Apr
23
comment Production vs. Collection, and Contaminants vs. Depositions, what might be missing in cold fusion research
The "hello-type introduction" could go on your profile page.
Apr
22
comment Motivation for the Deformed Nekrasov Partition Function
mitchell.physics.tamu.edu/Conference/string2010/documents/… ... I think its chief utility lies somewhere in the space between M-theory and SQCD.
Apr
17
comment Some Korean researchers saying that they solved Yang-Mills existence and mass gap problem
Yongmin Cho has been pushing this idea for more than ten years e.g. arxiv.org/abs/hep-th/0301013
Apr
14
comment Vector and Spinor Representation in Ramond-Neveu-Schwarz Superstring Theory
I suggest that you put an email address in your profile so that people can contact you. If someone who actually knows string theory could talk with you, they should be able to quickly identify what would be useful for you to learn next.
Apr
11
revised Are the $10^{500}$ different string theories being whittled down?
added 943 characters in body
Apr
11
answered Are the $10^{500}$ different string theories being whittled down?
Apr
3
comment Does the wave function/density state actually exist?
@wnoise It's ultimately a question of quantum computational complexity and not proven. But all the known speedups obtained by quantum computers (e.g. in Shor's algorithm) are at best sub-exponential, suggesting that this is the true increment of complexity involved in passing from classical to quantum.
Mar
30
comment Are there theories that explain wave-particle duality?
Outlier, you should be interested in what are called "interpretations of quantum mechanics". They are the type of theories you're after.
Mar
22
awarded  Nice Question
Mar
21
comment From Freshman Mechanics to String Theory: A Comprehensive Textbook Sequence in Physics
Zwiebach's textbook starts from classical electromagnetism and goes to string phenomenology.