1,077 research outputs found
Place of manufacture diversification in cyclical development of the enterprise
The relevance of the researched problem is caused by the fact that diversification is one of the best options for reforming enterprises. The aim of the research: to consider changes in production of outputs in development cycles of the enterprise. This will help to reveal the nature of manufacture diversification. The leading method to the research of this problem is the system approach, which allows to elicit factors promoting formation of business mechanism of manufacture diversification under the conditions of volatile economic environment. The results of the research are: it is offered to enhance the existing classification of enterprises by nomenclative and technological characteristic, taking into account the specific nature of processing capacity. The materials of the research can be useful for control bodies of enterprises when taking constructive steps in the sphere of manufacture diversification and strategy development. © 2016 Erofeev and Smolin
OPERA neutrinos and relativity
In a recent study, Cohen and Glashow argue that superluminal neutrinos of the
type recently reported by OPERA should be affected by anomalous Cherenkov-like
processes. This causes them to loose much of their energy before reaching the
OPERA detectors. Related concerns were reported also by Gonzalez-Mestres and Bi
et. al., who argued that pions cannot decay to superluminal neutrinos over part
of the energy range studied by OPERA. We observe here that these arguments are
set within a framework in which Lorentz symmetry is broken, by the presence of
a preferred frame. We further show that these anomalous processes are forbidden
if Lorentz symmetry is instead "deformed", preserving the relativity of
inertial frames. These deformations add non-linear terms to energy momentum
relations, conservation laws and Lorentz transformations in a way that is
consistent with the relativity of inertial observers.Comment: 5 pages, some citations added; in v3 a footnote added and minor
changes in the text made, the final version to appear in MPL
Relative Locality in -Poincar\'e
We show that the -Poincar\'e Hopf algebra can be interpreted in the
framework of curved momentum space leading to the relativity of locality
\cite{AFKS}. We study the geometric properties of the momentum space described
by -Poincar\'e, and derive the consequences for particles propagation
and energy-momentum conservation laws in interaction vertices, obtaining for
the first time a coherent and fully workable model of the deformed relativistic
kinematics implied by -Poincar\'e. We describe the action of boost
transformations on multi-particles systems, showing that in order to keep
covariant the composed momenta it is necessary to introduce a dependence of the
rapidity parameter on the particles momenta themselves. Finally, we show that
this particular form of the boost transformations keeps the validity of the
relativity principle, demonstrating the invariance of the equations of motion
under boost transformations.Comment: 24 pages, 4 figures, 1 table. v2 matches accepted CQG versio
The linearization of the Kodama state
We study the question of whether the linearization of the Kodama state around
classical deSitter spacetime is normalizable in the inner product of the theory
of linearized gravitons on deSitter spacetime. We find the answer is no in the
Lorentzian theory. However, in the Euclidean theory the corresponding
linearized Kodama state is delta-functional normalizable. We discuss whether
this result invalidates the conjecture that the full Kodama state is a good
physical state for quantum gravity with positive cosmological constant.Comment: 14 pages, statement on the corresponding Yang-Mills case correcte
Relative locality: A deepening of the relativity principle
We describe a recently introduced principle of relative locality which we
propose governs a regime of quantum gravitational phenomena accessible to
experimental investigation. This regime comprises phenomena in which
and may be neglected, while their ratio, the Planck mass , is important. We propose that governs the scale at
which momentum space may have a curved geometry. We find that there are
striking consequences for the concept of locality. The description of events in
spacetime now depends on the energy used to probe it. But there remains an
invariant description of physics in phase space. There is furthermore a
reasonable expectation that the geometry of momentum space can be measured
experimentally using astrophysical observations.Comment: 8 pages, Latex; this essay was awarded Second Prize in the 2011 Essay
Competition of the Gravity Research Foundatio
Rainbow universe
The formalism of rainbow gravity is studied in a cosmological setting. We
consider the very early universe which is radiation dominated. A novel
treatment in our paper is to look for an ``averaged'' cosmological metric
probed by radiation particles themselves. Taking their cosmological evolution
into account, we derive the modified Friedmann-Robertson-Walker(FRW) equations
which is a generalization of the solution presented by Magueijo and Smolin.
Based on this phenomenological cosmological model we argue that the spacetime
curvature has an upper bound such that the cosmological singularity is absent.
These modified equations can be treated as effective equations in the
semi-classical framework of quantum gravity and its analogy with the one
recently proposed in loop quantum cosmology is also discussed.Comment: 5 page
Ideal-Modified Bosonic Gas Trapped in an Arbitrary Three Dimensional Power-Law Potential
We analyze the effects caused by an anomalous single-particle dispersion
relation suggested in several quantum-gravity models, upon the thermodynamics
of a Bose-Einstein condensate trapped in a generic 3-dimensional power-law
potential. We prove that the shift in the condensation temperature, caused by a
deformed dispersion relation, described as a non-trivial function of the number
of particles and the shape associated to the corresponding trap, could provide
bounds for the parameters associated to such deformation. Additionally, we
calculate the fluctuations in the number of particles as a criterium of
thermodynamic stability for these systems. We show that the apparent
instability caused by the anomalous fluctuations in the thermodynamic limit can
be suppressed considering the lowest energy associated to the system in
question.Comment: 10 pages. arXiv admin note: text overlap with arXiv:1202.380
Constraints on the quantum gravity scale from kappa - Minkowski spacetime
We compare two versions of deformed dispersion relations (energy vs momenta
and momenta vs energy) and the corresponding time delay up to the second order
accuracy in the quantum gravity scale (deformation parameter). A general
framework describing modified dispersion relations and time delay with respect
to different noncommutative kappa -Minkowski spacetime realizations is firstly
proposed here and it covers all the cases introduced in the literature. It is
shown that some of the realizations provide certain bounds on quadratic
corrections, i.e. on quantum gravity scale, but it is not excluded in our
framework that quantum gravity scale is the Planck scale. We also show how the
coefficients in the dispersion relations can be obtained through a
multiparameter fit of the gamma ray burst (GRB) data.Comment: 9 pages, final published version, revised abstract, introduction and
conclusion, to make it clear to general reade
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