4,306 research outputs found
Invariant approach to flavour-dependent CP-violating phases in the MSSM
We use a new weak basis invariant approach to classify all the observable
phases in any extension of the Standard Model (SM). We apply this formalism to
determine the invariant CP phases in a simplified version of the Minimal
Supersymmetric SM with only three non-trivial flavour structures. We propose
four experimental measures to fix completely all the observable phases in the
model. After these phases have been determined from experiment, we are able to
make predictions on any other CP-violating observable in the theory, much in
the same way as in the Standard Model all CP-violation observables are
proportional to the Jarlskog invariant.Comment: 25 pages, 12 figure
Los museos de la Ciencia y la TĂ©cnica, entre las musas y la modernidad
After a short miscellany about the evolution of Science Museums, a debate on the question "Must Science Museums be used for motivation or for learning?", is opened
Work distributions in the T=0 Random Field Ising Model
We perform a numerical study of the three-dimensional Random Field
Ising Model at T=0. We compare work distributions along metastable
trajectories obtained with the single-spin flip dynamics with the distribution
of the internal energy change along equilibrium trajectories. The goal is to
investigate the possibility of extending the Crooks fluctuation theorem to zero
temperature when, instead of the standard ensemble statistics, one considers
the ensemble generated by the quenched disorder. We show that a simple
extension of Crooks fails close to the disordered induced equilibrium phase
transition due to the fact that work and internal energy distributions are very
asymmetric
Maximum entropy approach to power-law distributions in coupled dynamic-stochastic systems
Statistical properties of coupled dynamic-stochastic systems are studied
within a combination of the maximum information principle and the
superstatistical approach. The conditions at which the Shannon entropy
functional leads to a power-law statistics are investigated. It is demonstrated
that, from a quite general point of view, the power-law dependencies may appear
as a consequence of "global" constraints restricting both the dynamic phase
space and the stochastic fluctuations. As a result, at sufficiently long
observation times the dynamic counterpart is driven into a non-equilibrium
steady state whose deviation from the usual exponential statistics is given by
the distance from the conventional equilibrium
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