7,297 research outputs found
Europe’s Electricity Supply Security: Strengthening the Chain. CEPS Policy Brief No. 224/November 2010
Acknowledging that efficient development of electricity transmission infrastructure is crucial to achieving EU targets for a secure, competitive and sustainable electricity supply, this paper explores ways of strengthening the supply chain. Research for the paper was carried out in the context of the SECURE project (Security of Energy Considering its Uncertainties, Risks and Economic Implications), funded by the European Commission under the Seventh Framework Programme. The project develops appropriate tools for evaluating the vulnerability of the EU to the different energy supply risks, and for promoting the optimisation of EU energy insecurity mitigation strategies, including investment, demand side management and dialogue with producing countries
Inhomogeneous Quantum Mixmaster: from Classical toward Quantum Mechanics
Starting from the Hamiltonian formulation for the inhomogeneous Mixmaster
dynam- ics, we approach its quantum features through the link of the
quasi-classical limit. We fix the proper operator-ordering which ensures that
the WKB continuity equation overlaps the Liouville theorem as restricted to the
configuration space. We describe the full quantum dynamics of the model in some
details, providing a characterization of the (discrete) spectrum with analytic
expressions for the limit of high occupation number. One of the main
achievements of our analysis relies on the description of the ground state
morphology, showing how it is characterized by a non-vanishing zero-point
energy associated to the Universe anisotropy degrees of freedomComment: 17 pages, 6 figures, to appear on Classical and Quantum Gravity PACS:
04.20.Jb, 98.80.Dr, 83
Models of free quantum field theories on curved backgrounds
Free quantum field theories on curved backgrounds are discussed via three
explicit examples: the real scalar field, the Dirac field and the Proca field.
The first step consists of outlining the main properties of globally hyperbolic
spacetimes, that is the class of manifolds on which the classical dynamics of
all physically relevant free fields can be written in terms of a Cauchy
problem. The set of all smooth solutions of the latter encompasses the
dynamically allowed configurations which are used to identify via a suitable
pairing a collection of classical observables. As a last step we use such
collection to construct a -algebra which encodes the information on the
dynamics and on the canonical commutation or anti-commutation relations
depending whether the underlying field is a Fermion or a Boson.Comment: 41 page
Classical and Quantum Aspects of the Inhomogeneous Mixmaster Chaoticity
We refine Misner's analysis of the classical and quantum Mixmaster in the
fully inhomogeneous picture; we both connect the quantum behavior to the
ensemble representation, both describe the precise effect of the boundary
conditions on the structure of the quantum states.Comment: 3 pages, 2 figures, proceedings of the XI Marcel Grossmann meeting on
Relativistic Astrophysics, July 23-29, 2006, Berli
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