... After the recognition of theoretical processes that create Lorentz violation, testing Lorentz
invariance becomes very exciting
Lorentz and CPT violation has been shown to occur in Planck scale theories, including:
- string theory
- noncommutative field theory
- quantum loop gravity
- extra dimension ...
Particle Physics 2011
... 2011 was the first year in which significant amounts of data
from the LHC were available. At the yearly meeting of the
Alliance in Bonn, which took place in December 2011, the
excitement in the community was very tangible. Though no
final results were available, talk about the Higgs boson and
Chapter 3: Quantum Computing
... except an upper bound is imposed on both the intensity to do the sensing
(which again is an arbitrarily small multiplicative factor of the input intensity) whether or not the obstructing body is present. A quantum optical
method for IFS (but not IFM) may be used to do I/O with bandwidth reduced by a ...
Quantum Information Processing: Algorithms, Technologies and
... for transmission of classical information, still in certain cases entangled states can be compressed to fewer qubits. This quantum compression could have important applications in
practice, where the number of usable qubits is very limited. Schumacher  considered
compression and decompression o ...
Topological phases and polaron physics in ultra cold quantum gases
... typically means that we can write down a Hamiltonian Ĥ (or a Lagrangian) which describes
the relevant microscopic degrees of freedom. However, this by far does not mean that all
the physics is well understood at moderate energies! The interplay of many indistinguishable
particles – of the order of ...
Nematic Fermi Fluids in Condensed Matter Physics
... Strongly correlated electron systems are mostly defined by what they are not: they are not
gases of weakly interacting quasiparticles (QPs) (Fermi gases), but they are still electron
fluids (i.e., not insulators). Perhaps classical liquids are a good analogy. They are so
different locally from a gas ...
Approaches to Quantum Gravity
... are following in their searches. The focus is on non-perturbative aspects of Quantum Gravity and on the fundamental structure of space and time. The variety of
approaches presented is intended to ensure that a variety of ideas and mathematical
techniques will be introduced to the reader.
More specif ...
In theoretical physics, quantum chromodynamics (QCD) is the theory of strong interactions, a fundamental force describing the interactions between quarks and gluons which make up hadrons such as the proton, neutron and pion. QCD is a type of quantum field theory called a non-abelian gauge theory with symmetry group SU(3). The QCD analog of electric charge is a property called color. Gluons are the force carrier of the theory, like photons are for the electromagnetic force in quantum electrodynamics. The theory is an important part of the Standard Model of particle physics. A huge body of experimental evidence for QCD has been gathered over the years.QCD enjoys two peculiar properties:Confinement, which means that the force between quarks does not diminish as they are separated. Because of this, when you do separate a quark from other quarks, the energy in the gluon field is enough to create another quark pair; they are thus forever bound into hadrons such as the proton and the neutron or the pion and kaon. Although analytically unproven, confinement is widely believed to be true because it explains the consistent failure of free quark searches, and it is easy to demonstrate in lattice QCD.Asymptotic freedom, which means that in very high-energy reactions, quarks and gluons interact very weakly creating a quark–gluon plasma. This prediction of QCD was first discovered in the early 1970s by David Politzer and by Frank Wilczek and David Gross. For this work they were awarded the 2004 Nobel Prize in Physics.The phase transition temperature between these two properties has been measured by the ALICE experiment to be well above 160 MeV. Below this temperature, confinement is dominant, while above it, asymptotic freedom becomes dominant.