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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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    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

    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

    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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    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

    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

    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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    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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    QFT in curved spacetime

    Hi PF I know that a goal of the current research in High Energy physics is to get a describtion of QFT in curved spacetime. I assume this has yet to be described fully, but how about plain quantum mechanics in curved spacetime? Has it yet been described? Schreiber
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    The M-theory conjecture

    Hi there PF My question here is: Is the Bagger-Lambert-Gustavsson action (http://en.wikipedia.org/wiki/Bagger%E2%80%93Lambert%E2%80%93Gustavsson_action) a way of proving the "M-theory as a matrix model: a conjecture" (http://arxiv.org/abs/hep-th/9610043) or is it a different approach? And how...
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    Gravity/Electroweak unification based on generalized Yang-Mills

    http://arxiv.org/abs/1106.2121 Abstract: Gravitational and electroweak interactions can be unified in analogy with the unification in the Weinberg-Salam theory. The Yang-Mills framework is generalized to include space-time translational group T(4), whose generators $T_{\mu}(=\p/\p x^{\mu})$...
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    Simulation of the universe

    Hi PF I would like to ask, if it would be possible to simulate the whole universe from the beginning, with the following ingredients: A full theory of quantum gravity (LQG, CDT or whatever theory proves to be correct) coupled to matter- and other force-field (for example LQG coupled to a...
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    Question on recreating the Big Bang

    Hi there PF I know this is rather unorthodox, but I have been watching the science-fiction series Eureka for a while now, and in the latest episode I have seen, there was a device, that would recreate the Big Bang itself. The episode I am speaking of is episode 8 in season 2 (link to episode...
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    First test of string theory

    http://arxiv.org/PS_cache/arxiv/pdf/1105/1105.5283v1.pdf [Broken] Abstract We provide a simple transfer function that considers the impact of an early matter dominated era on the gravitational wave background and show that string theory can be tested by observations of the gravitational wave...
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    Problem of time: No-time theories?

    Hi there PF :) Are there currently any physical theories trying to get rid of time, since time is not actually a measureable quantity (one measures the frequency of a quartz crystal in a wristwatch, not time, one measures the frequency of a pendulum in a tower clock, not time, one measure...
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    Fermionic nature of quantum gravity

    In this new paper today http://arxiv.org/abs/1105.4184, is it considered whether quantum gravity actually has fermionic fields rather than just bosonic fields: Abstract It is generally assumed that the gravitational field is bosonic. Here we show that a simple propagating torsional theory...
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    Field Strenght

    Hi there PF How does on calculate the field strenght of the electromagnetic field (from Maxwells equations) and of the gravitational field (from general relativity). I want to relate this to particle physics, where the relative strenghts of the fundamental interactions are calculated here...
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    Classical Unified Field Theory

    Hi there PF. I have recently been working on the Classical Unified Field Theory, and i want to ask, why the Einstein-Maxwell equations does not candidate for a Classical Unified Field Theory, since it incorporates both general relativity and electromagnetism, into a single formalism? I...
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    Groups in physics

    Hi there PF What are groups, and what are they used for in physics? For example if you look at QED, http://en.wikipedia.org/wiki/Quantum...cs#Mathematics [Broken], it is said here that QED is a abelian gauge theory with symmetry group U(1). What is this symmetry group, and what is it used for...
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    Electromagnetic waves and charge sources

    Hi PF Are there an interaction between an electromagnetic wave and a charge source? For example, does an electromagnetic wave get attracted by a charge source, the same way the Earth attracts the moon? Or is something else going on?
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    Need help with this equation!

    Hi PF I need help with identifying an equation. It contains the following: The sum of: The laplacian of a vectorfunction, the second time derivative of a vectorfunction and the first time derivative of a vectorfunction, which is all equal to zero. Laplacian(V)+d^2/dt^2(V)+d/dt(V)=0...
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    QFT vs. Relativistic quantum mechanics

    Hi PF How does Quantum Field Theory differ from relativistic quantum mechanics? Ain't Quantum field theory just relativistic quantum mechanics or are there more to the subject? :) Thanks in advance \Schreiber
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    Quantum fluctuations and space

    Hi PF Can quantum fluctuations create space? And if so, could quantum fluctuations have created the universe and therefore spacetime we live in? \Schreiber
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    Discovery of Higgs: Does this mean anything to String theory?

    Hi PF Does the discovery of the Higgs Boson mean anything to string theory ? Does it falscify or verify the theory, or is it completely irrelavant for the theory? \Schreiber
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    Integral table

    Hi there PF Im looking for a good book of integral tables. Any suggestions on good books? :) Thanks in advance \Schreiber
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    CDT and Statistical mechanics

    I just want to ask why Causal Dynamical Triangulations use a partition function for describing the dynamics of the whole theory. Does the theory have some deep relation to statistical mechanics because of this formulation of the theory? Or is the partition function also a usual terminology to...
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