8 research outputs found
A possible solution for dinamically managing virtual environments
In modern distributed computer systems (clusters and computing GRIDs) a new class of problems, due to the increasing heterogeneity of usersâ needs, have to be tackled by the administrators. One possible solution is to create ondemand virtual working environments tailored on the userâs requirements. Hence the need for an architecture to manage dynamically such environments. In this work we propose a possible solution based on the use of Virtual Machines (Xen), the implementation of a Virtual Machine Manager, capable of creation, destruction and migration of the virtualized working environments. The information will be collected using a client-server mechanism, to allow the manager to deploy preconfigured Virtual Machines on the available hardware resources. When a new execution
environment became active, it is automatically recognized by the Batch System Manager and is then ready to be used
The High-Level Interface Definitions in the ASTRI/CTA Mini Array Software System (MASS)
ASTRI (Astrofisica con Specchi a Tecnologia Replicante Italiana) is a Flagship Project funded by the Italian Ministry of Education, University and Research, and led by INAF, the Italian National Institute of Astrophysics. Within this framework, INAF is currently developing an end-to-end prototype, named ASTRI SST-2M, of a Small Size Dual-Mirror Telescope for the Cherenkov Telescope Array, CTA. A second goal of the project is the realization of the ASTRI/CTA mini-array, which will be composed of seven SST-2M telescopes placed at the CTA Southern Site. The ASTRI Mini Array Software System (MASS) is designed to support the ASTRI/CTA mini-array operations. MASS is being built on top of the ALMA Common Software (ACS) framework, which provides support for the implementation of distributed data acquisition and control systems, and functionality for log and alarm management, message driven communication and hardware devices management. The first version of the MASS system, which will comply with the CTA requirements and guidelines, will be tested on the ASTRI SST-2M prototype. In this contribution we present the interface definitions of the MASS high level components in charge of the ASTRI SST-2M observation scheduling, telescope control and monitoring, and data taking. Particular emphasis is given to their potential reuse for the ASTRI/CTA mini-array
SUGRA New Inflation with Heisenberg Symmetry
We propose a realisation of 'new inflation' in supergravity (SUGRA), where
the flatness of the inflaton potential is protected by a Heisenberg symmetry.
Inflation can be associated with a particle physics phase transition, with the
inflaton being a (D-flat) direction of Higgs fields which break some symmetry
at high energies, e.g. of GUT Higgs fields or of Higgs fields for flavour
symmetry breaking. This is possible since compared to a shift symmetry, which
is usually used to protect a flat inflaton potential, the Heisenberg symmetry
is compatible with a (gauge) non-singlet inflaton field. In contrast to
conventional new inflation models in SUGRA, where the predictions depend on
unknown parameters of the K"ahler potential, the model with Heisenberg symmetry
makes discrete predictions for the primordial perturbation parameters which
depend only on the order n at which the inflaton appears in the effective
superpotential. The predictions for the spectral index n_s can be close to the
best-fit value of the latest Planck 2013 results.Comment: 8 pages, 3 figures; v2: matches publication in JCA
CTA Contributions to the 34th International Cosmic Ray Conference (ICRC2015)
List of contributions from the CTA Consortium presented at the 34th
International Cosmic Ray Conference, 30 July - 6 August 2015, The Hague, The
Netherlands.Comment: Index of CTA conference proceedings at the ICRC2015, The Hague (The
Netherlands). v1: placeholder with no arXiv links yet, to be replaced once
individual contributions have been all submitted; v2: final with arXiv links
to all CTA contributions and full author lis