نتایج جستجو برای: quinn

تعداد نتایج: 1564  

1992
Marc Kamionkowski

Global-symmetry violating higher-dimension operators, expected to be induced by Planck-scale physics, in general drastically alter the properties of the axion field associated with the Peccei-Quinn solution to the strong-CP problem, and render this solution unnatural. The particle physics and cosmology associated with other global symmetries can also be significantly changed. ⋆ Research support...

2014
Alex Bombrun Jean-Baptiste Pomet F. Lamnabhi-Lagarrigue

RÉSUMÉ. Sous les hypothèses requises, on étudie une version discontinue des lois de contrôle dites “amortissantes” ou encore “de Jurdjevic-Quinn”. On présente un résultat de stabilisation pratique lorsque la borne sur les contrôles est suffisamment petite. La motivation est d’estimer sa croissance du temps qu’il faut pour atteindre un voisinage donné de la cible quand la susdites borne tend ver...

Journal: :Statistics 2022

This paper aims to study data driven model selection criteria for a large class of time series, which includes ARMA or AR(∞) processes, as well GARCH ARCH(∞), APARCH and many others processes. We tackled the challenging issue designing adaptive enjoys strong consistency property. When observations are generated from one aforementioned models, new criteria, select true almost surely asymptotical...

Journal: :Physical review 2022

We build a model in which the relic abundance of axions is altered from standard misalignment mechanism, either increased or decreased, due to presence new light scalar that couples radial part Peccei-Quinn (PQ) field. The makes effective PQ symmetry-breaking scale dynamical, altering early-time dynamics for axion and affecting its late-time dark matter abundance. analyze this mechanism semiana...

1997
V. A. Rubakov

We argue that sufficiently complex grand unified theories involving extra strong intractions that confine at very short distances, may lead to a heavy axion solution of the CP problem of QCD. This axion may have a mass within accessible energy range, and its low energy interactions emerge through mixing with axial Higgs boson(s). Another signature of this scenario is softly broken Peccei—Quinn ...

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