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thesis
thesis

The Causal Set Approach to Quantum Gravity
The Causal Set Approach to Quantum Gravity

"Loop Quantum Gravity" (Rovelli)
"Loop Quantum Gravity" (Rovelli)

... of course, in approximations). The world is more complicated, or perhaps simpler, than that. For a relativist, in fact, general relativity is much more than the field theory of one particular force. Rather, it is the discovery that certain classical notions about space and time are inadequate at the ...
Pair production processes and flavor in gauge
Pair production processes and flavor in gauge

doc - StealthSkater
doc - StealthSkater

... replaced with 2-D partonic surfaces so that in the gravitational case one has stringy 3-surfaces at vertices. At the QFT limit, one can hope a description as a bi-local process using a bi-local generalization of the QFT limit so that stringy degrees-of-freedom need not be described explicitly. There ...
Elementary Particles in Physics
Elementary Particles in Physics

... different kinds of hadrons, some almost stable and some (known as resonances) extremely short-lived. The degree of stability depends mainly on the mass of the hadron. If its mass lies above the threshold for an allowed decay channel, it will decay rapidly; if it does not, the decay will proceed thro ...
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Recently an undergraduate engineering student asked me if

Quantum computers - Quantum Engineering Group
Quantum computers - Quantum Engineering Group

Fermi and the Theory of Weak Interactions
Fermi and the Theory of Weak Interactions

Fermi and the Theory of Weak Interactions
Fermi and the Theory of Weak Interactions

Physics 36300 - Particle Physics
Physics 36300 - Particle Physics

... Possible topics include differential geometry, group theory, Hilbert spaces, functional analysis, and topology. 23800. Modern Atomic Physics. PQ: PHYS 23500. This course is an introduction to modern atomic physics. Topics include atomic structure, fundamental symmetries in atoms, interactions of ato ...
Electrogravitic References
Electrogravitic References

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ElectroGravitics_01

... region of the electron. This has some profound implications -- one of which is that the motional electric force field is immune to electrostatic or magnetic shielding. Experimentally, it can be confirmed that the motional electric field is immune to shielding and follows the boundary conditions of t ...
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Janiszewski_washington_0250E_13369

... the same physical energy spectrum. Although this example of T-duality for a classical string is illustrative, it may appear trivial. Fortunately, at the level of quantum superstring theory T-duality is still present and has a shocking consequence: of the five consistent superstring theories, Type II ...
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How far are we from the quantum theory of gravity?

final report - Cordis
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... Since the start of this project, this line of idea has proven to open up many novel research opportunities, both experimental and theoretical. A lot of groups around the world have started working on dissipation-based ideas for quantum information processing. The QUEVADIS (Quantum Engineering via Di ...
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Lorentz violating field theories and nonperturbative physics

... At the fundamental (usually Planck scale) level, models with LIV have been put forward in roughly two categories. 1. Models with a Lorentz-invariant Lagrangian (dynamical Lorentz invariance) that exhibit spontaneous symmetry breaking of Lorentz invariance. 2. Models without Lorentz symmetry at the f ...
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Terrestrial Energy Frontier: TEVATRON Searches for Higgs and Supersymmetry

... Separate piece of SM introduced “by hand” Mass ↔ Rest energy If we make particle interact with vacuum it will acquire additional energy → MASS In the Standard Model the vacuum is “skewed” by the Higgs field, and particles get mass from interaction with the Higgs field ...
Broken symmetry revisited - Homepages of UvA/FNWI staff
Broken symmetry revisited - Homepages of UvA/FNWI staff

... Also, an important effect on the spectrum and the interactions of a theory with a broken gauge group is caused by the introduction of additional topological terms in the action, such as a nonvanishing θ angle in 3+1 dimensional space time and the Chern-Simons term in 2+1 dimensions. It has been show ...
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strong interactions of hadrons at high energies - Assets

... and gluons interact weakly due to the asymptotic freedom. The domain of expertise of the old theory is complementary: it is about normal size hadron–hadron cross sections, soft interactions that at high energies are dominated by peripheral collisions developing at large distances. QCD only starts to ...
Superstring Theory and Empirical Testability - Philsci
Superstring Theory and Empirical Testability - Philsci

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Quantum mechanical approaches to the virial S.LeBohec

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Chapter 3 SIZE, SCALE AND THE BOAT RACE - Neti

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Quantum gravity



Quantum gravity (QG) is a field of theoretical physics that seeks to describe the force of gravity according to the principles of quantum mechanics.The current understanding of gravity is based on Albert Einstein's general theory of relativity, which is formulated within the framework of classical physics. On the other hand, the nongravitational forces are described within the framework of quantum mechanics, a radically different formalism for describing physical phenomena based on probability. The necessity of a quantum mechanical description of gravity follows from the fact that one cannot consistently couple a classical system to a quantum one.Although a quantum theory of gravity is needed in order to reconcile general relativity with the principles of quantum mechanics, difficulties arise when one attempts to apply the usual prescriptions of quantum field theory to the force of gravity. From a technical point of view, the problem is that the theory one gets in this way is not renormalizable and therefore cannot be used to make meaningful physical predictions. As a result, theorists have taken up more radical approaches to the problem of quantum gravity, the most popular approaches being string theory and loop quantum gravity. A recent development is the theory of causal fermion systems which gives quantum mechanics, general relativity, and quantum field theory as limiting cases.Strictly speaking, the aim of quantum gravity is only to describe the quantum behavior of the gravitational field and should not be confused with the objective of unifying all fundamental interactions into a single mathematical framework. While any substantial improvement into the present understanding of gravity would aid further work towards unification, study of quantum gravity is a field in it's own right with various branches having different approaches to unification. Although some quantum gravity theories, such as string theory, try to unify gravity with the other fundamental forces, others, such as loop quantum gravity, make no such attempt; instead, they make an effort to quantize the gravitational field while it is kept separate from the other forces. A theory of quantum gravity that is also a grand unification of all known interactions is sometimes referred to as a theory of everything (TOE).One of the difficulties of quantum gravity is that quantum gravitational effects are only expected to become apparent near the Planck scale, a scale far smaller in distance (equivalently, far larger in energy) than what is currently accessible at high energy particle accelerators. As a result, quantum gravity is a mainly theoretical enterprise, although there are speculations about how quantum gravity effects might be observed in existing experiments.
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