Browsing Τμήμα Φυσικής / Department of Physics by Title
Now showing items 21-40 of 1411
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Article
Analytic Q ball solutions in a parabolic-type potential
(2000)We introduce a piecewise parabolic potential for a complex scalar field and we show that it admits stable Q ball solutions. These solutions can be found analytically, unlike the case of polynomial potentials. We find stable ...
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Article
Analytic solutions for the evolution of domain walls
(1999)We introduce an unusual asymmetric double well potential, a piecewise parabolic one, and we show that the solutions for the evolution of its domain walls can be found analytically, in contrast with the case of the standard ...
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Article
Analytic vortex solutions in an unusual Mexican-hat potential
(1997)We introduce an unusual Mexican-hat potential, a piecewise parabolic one, and we show that its vortex solutions can be found analytically, in contrast to the case of the standard |Ψ|4 field theory.
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Article
Annealing Kinetics of Defects of Ion-Implanted and Furnace-Annealed Silicon Layers - Thermodynamic Approach
(1992)This article reviews some recent results concerning the effects of isochronal annealing and the attempts to model the kinetics of local reconstruction mechanisms of layers with different degrees of inhomogeneity such as ...
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Article
Anomalous electronic conductance in quasicrystals
(2000)Subtle quantum interference effects in one-dimensional quasicrystals are reported. Quite opposite to their metallic counterparts, quasiperiodic systems are shown to exhibit interesting variations of their conducting ...
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Article
Antivortex domain walls observed in permalloy rings via magnetic force microscopy
(2009)Magnetic domain walls in patterned permalloy ring elements of different widths and thicknesses have been probed by magnetic force microscopy and micromagnetic simulations. We report the experimental observation of antivortex ...
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Book
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Article
Arbitrary mixture of two charged interacting particles in a magnetic Aharonov-Bohm ring: Persistent currents and Berry's phases
(2010)Aharonov-Bohm physics at the two-particle level is investigated for distinguishable interacting charged particles through the exact solution of a toy model with confined states. The effect of the inaccessible magnetic flux ...
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Article
Arsenic implanted silicon by transport effect. Thermal annealing influence
(1987)A study of the effects of thermal annealing on the transport properties in arsenic implanted silicon films is reported. In particular, the sheet resistance and the Hall mobility obtained by the Van der Pauw method is ...
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Conference Object
Aspects of string cosmology
(Trieste, SISSA: Proceedings of Science., 2013)We review recent progress in string cosmology, where string dualities are applied so as to obtain complete cosmological evolutions, free of any essential singularities. Two classes of models are analyzed. The first class ...
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Article
Associate K0 production in p+p collisions at 3.5 GeV: The role of Δ(1232)++
(2014)An exclusive analysis of the four-body final states Λ+p+π++K0 and Σ0+p+π++K0 measured with HADES for p+p collisions at a beam kinetic energy of 3.5 GeV is presented. The analysis uses various phase space variables, such ...
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Article
Asymptotic scaling corrections in QCD with Wilson fermions from the 3-loop average plaquette
(1998)We calculate the 3-loop perturbative expansion of the average plaquette in lattice QCD with Nf massive Wilson fermions and gauge group SU(N). The corrections to asymptotic scaling in the corresponding energy scheme are ...
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Article
Axial charges of hyperons and charmed baryons using Nf=2+1+1 twisted mass fermions
(2016)The axial couplings of the low lying baryons are evaluated using a total of five ensembles of dynamical twisted mass fermion gauge configurations. The simulations are performed using the Iwasaki gauge action and two ...
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Article
Axial nucleon and nucleon to Δ form factors and the Goldberger-Treiman relations from lattice QCD
(2007)We evaluate the nucleon axial form factor, GA(q2), and induced pseudoscalar form factor, Gp(q2), as well as the pion-nucleon form factor, GπNN(q2), in lattice QCD. We also evaluate the corresponding nucleon to Δ transition ...
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Article
Axial nucleon form factors from lattice QCD
(2011)We present results on the nucleon axial form factors within lattice QCD using two flavors of degenerate twisted mass fermions. Volume effects are examined using simulations at two volumes of spatial length L=2.1fm and ...
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Article
B-meson properties from lattice QCD
(1991)A high statistics computation of the decay constant f{hook}B is presented to study scaling and finite size effects. Smooth wave functions for the B-meson allow to suppress excited state contributions effectively. We observe ...
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Article
Baryon resonance production and dielectron decays in proton-proton collisions at 3.5 GeV
(2014)We report on baryon resonance production and decay in proton-proton collisions at a kinetic energy of 3.5 GeV based on data measured with HADES. The exclusive channels pp → npπ+ and pp → ppπ0 as well as pp → ppe+e- are ...
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Article
Baryon spectrum with Nf=2+1+1 twisted mass fermions
(2014)The masses of the low-lying baryons are evaluated using a total of ten ensembles of dynamical twisted mass fermion gauge configurations. The simulations are performed using two degenerate flavors of light quarks, and a ...
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Article
Baryon structure from Lattice QCD
(2009)We present recent lattice results on the baryon spectrum, nucleon electromagnetic and axial form factors, nucleon to Δ transition form factors as well as the Δ electromagnetic form factors. The masses of the low lying ...