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    Geometrical GUT?

    Hi PF! When Einstein was done with his General theory of Relativity, he was trying to build upon this theory, through different approaches, like the Kaluza-Klein theory, to try to build a classical theory of everything, which was purely geometrical. Since this wasn't successful throughout the...
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    Could the new particle @ CERN be a massive graviton?

    Hi PF. I was wondering, if the newly observed particle @ CERN, could be a massive tensor boson, like a massive graviton. I have not been able to find out, whether ATLAS or CMS have determined if the new particle is a scalar, vector or tensor boson, so I thought it would be intersting, if the...
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    Post Your Summer/Fall 2012 Class Schedules

    Fall 2012: Electrodynamics 2 (Electromagnetic waves and relativity) Analytical mechanics Quantum mechanics 1 Philosophy of Science and ethics for physicsts Rather excited about analytical mechanics and quantum mechanics!
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    Holographic principle and conservation of energy

    Well, my question is, why does it seem like energy is not conserved? Because to me, it looks like, that the energy of the universe must increase in time, because of the increasing entropy of the universe due to the second law of thermodynamics. Therefore energy is not conserved, which...
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    Holographic principle and conservation of energy

    Hi PF! I was wondering, if the holographic principle (from string theory) really can be true. I see some physical flaws in the way it works. Here is why: Suppose that the second law of thermodynamics is true. It states that for any system, the multiplicity of the system must increase, ergo...
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    Hawking Radiation

    The way I originally learned about Hawking radiation was, that it was due to virtual particle pairs being made near the horizon. Then one gets sucked in, while the other escapes... The black hole looses mass, because it lends its energy (thereby mass) for a short amount of time to the particle...
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    Hawking Radiation

    Hi PF I was wondering, if Hawking radiation could have a different source than black-body radiation. I was wondering, if quantum tunneling could be a possible way, for energy to slip out of the grasp of the black holes gravitational attraction and slip through the event horizon. Would this be...
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    Gravity: The explanation for quantum statistical effects?

    Hi PF I was wondering about the problem of quantum gravity, and maybe the reason why we struggle so much with a formulation of quantum gravity is, that spacetime itself is the source to all quantum phenomena. The evidence is, that with the standard model, we describe the quantum phenomena...
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    Weak nuclear force: Charge

    Well.. What then determines if, for example, a nucleus is unstable and makes a beta decay? How does this connect to weak isospin? Does unstable nuclei have larger weak isospin than stable ones, or how does it work? :) Thank for you :D And by the way: It actually makes quite good sense to me...
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    Relation between Verlinde's Entropic gravity and AdS/CFT

    Thank you so much :) It has been a most helpful discussion with you guys, and the clarification has been terrific :) I am sorry for my misunderstanding of the meaning of the papers, because I could not see the connection between the two research areas from the papers.
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    Weak nuclear force: Charge

    Yes, sorry about that. I have been looking around, and found the term "weak isospin". Could that be put on foot with mass, electrical and color charge?
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    Weak nuclear force: Charge

    Hi PF I was wondering today about the origin of the fundamental forces. Now gravity comes from mass (lets call this massive charge), electromagnetism comes from electrical charge and the strong force comes from color charge. These are all kinds of "charges", but what kind of "charge" gives...
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    Rodin coil unique magnetics?

    I have also been looking at Rodin coils lately, and I find it very troubling (fx this talk on TED ), that it could generate a magnetic field, even when the current is turned off. Any one knows anything about rodin coils' electromagnetic properties ?
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    Energy from matter-matter annihilation (relation to Dark Matter)

    But does any other particles have properties that would allow for matter-matter annihilation (supersymmetric, ordinary or hypothesized particles)? Or could they be sort of "stripped" for all properties, so that only the energy would be left, and annihilation then would be possible?
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    Relation between Verlinde's Entropic gravity and AdS/CFT

    But what would happen if we moved Verinde's holographic screens to the boundary of the bulk? Would it then resemble AdS/CFT, if the bulk theory was indeed AdS?
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    Energy from matter-matter annihilation (relation to Dark Matter)

    Well I was hoping that someone might know another example of this phenomenom (other than in Dark Matter) :)
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    Energy from matter-matter annihilation (relation to Dark Matter)

    As an example, I'll use Dark matter WIMP's (which are most simply refered to as Neutralino's (neutral Majorana fermion)), which can also be seen in this paper http://iopscience.iop.org/1742-6596/120/4/042005/pdf/1742-6596_120_4_042005..pdf
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    Energy from matter-matter annihilation (relation to Dark Matter)

    Hi PF Would it be theoretically possible to create energy (for example photons) from matter-matter annihilation (not using anti-matter), so that we could create a powerplant based on this, without the need of producing anti-matter for the energy production? I know that Dark Matter WIMP's...
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    Relation between Verlinde's Entropic gravity and AdS/CFT

    Btw I just had a thought on this. Now if we look at the Verlinde picture with the holographic screen, what would actually happen if we moved the screen to boundary of space (i.e. to infinity), would this setup then resemble the AdS/CFT, because the screen is now on the boundary of the bulk...
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    Relation between Verlinde's Entropic gravity and AdS/CFT

    It is just odd, because it seems like he is treating the situation as being space and time in his paper http://arxiv.org/abs/1001.0785, not like it is derived from matrix models.. Ohh well, it is probably my ignorance and lack of physics yet :wink:
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    Relation between Verlinde's Entropic gravity and AdS/CFT

    But what is the information on holographic screen then? Can't it be considered a CFT?
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    Relation between Verlinde's Entropic gravity and AdS/CFT

    Hi there PF I have been thinking about Verlinde's entropic gravity in relation to AdS/CFT. In Verlinde's gravity, gravity is caused by changes in entropy on holographic screens. Now if we look at the dimensionality of this picture, we have gravity in 3+1 dimensions (regular space, like where...
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    Supergravity paper on LHC-physics by Chris Austin

    Thank you for the advice Marcus. I am sorry if I have been spamming you with useless papers. I shall do my background-checking better, next time I will put up a paper in the forums. I can see that you've got a good point with his background, institutional situation etc. :)
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    Supergravity paper on LHC-physics by Chris Austin

    http://arxiv.org/abs/1103.2732 Abstract "Rough estimates are presented to show that the bump at 1.7 to 1.9 TeV seen in ATLAS-CONF-2010-088 could arise from about 10^{30} approximately degenerate Kaluza-Klein states of the d = 11 supergravity multiplet in the s channel, that could arise from...
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    Group Field Theory

    That really makes quite good sense, except: Does a group form a "space" in the same way ordinary coordinate-systems does (sort of the same way a Hilbert space works)? \Schreiber
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    Self-study on electromagnetism

    Hi there PF I am doing a self-study on electromagnetism based on "Introduction to Electrodynamics" by David Griffith. I am through with chapter 1, where I have solved all the problems. This has taken quite some time, so I want to ask, if anyone could give me some advice, about which problems...
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    Group Field Theory

    Hi there PF I just want to ask, what are the main ideas behind Group Field Theory? How does it work, and what is the formalism? And why is it called GROUP Field Theory? :) \Schreiber
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    The New Dijet Particle in the Tevatron IS the Higgs

    http://arxiv.org/abs/1104.4642 Abstract "The newly found \cite{CDFnew} dijet peak in the 120 GeV to 160 GeV mass region produced in co-production with W IS actually a Higgs Boson in spite of the expectation of a different decay pattern for most Higgses. Our point, however, is that the bound...
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