Search results for " Variety"

On Shimura subvarieties of the Prym locus

2018

We show that families of Pryms of abelian Galois covers of $\mathbb{P}^1$ in $A_{g-1}$ (resp. $A_g$) do not give rise to high dimensional Shimura subvareties.

The Oort conjecture on Shimura curves in the Torelli locus of hyperelliptic curves

2017

Abstract Oort has conjectured that there do not exist Shimura varieties of dimension >0 contained generically in the Torelli locus of genus-g curves when g is sufficiently large. In this paper we prove the analogue of this conjecture for Shimura curves with respect to the hyperelliptic Torelli locus of genus g > 7 .

The monodromy groups of Dolgachev's CY moduli spaces are Zariski dense

2014

Let $\mathcal{M}_{n,2n+2}$ be the coarse moduli space of CY manifolds arising from a crepant resolution of double covers of $\mathbb{P}^n$ branched along $2n+2$ hyperplanes in general position. We show that the monodromy group of a good family for $\mathcal{M}_{n,2n+2}$ is Zariski dense in the corresponding symplectic or orthogonal group if $n\geq 3$. In particular, the period map does not give a uniformization of any partial compactification of the coarse moduli space as a Shimura variety whenever $n\geq 3$. This disproves a conjecture of Dolgachev. As a consequence, the fundamental group of the coarse moduli space of $m$ ordered points in $\mathbb{P}^n$ is shown to be large once it is not…

A criterion for extending morphisms from open subsets of smooth fibrations of algebraic varieties

2021

Abstract Given a smooth morphism Y → S and a proper morphism P → S of algebraic varieties we give a sufficient condition for extending an S-morphism U → P , where U is an open subset of Y, to an S-morphism Y → P , analogous to Zariski's main theorem.

Three-qutrit entanglement and simple singularities

2016

In this paper, we use singularity theory to study the entanglement nature of pure three-qutrit systems. We first consider the algebraic variety $X$ of separable three-qutrit states within the projective Hilbert space $\mathbb{P}(\mathcal{H}) = \mathbb{P}^{26}$. Given a quantum pure state $|\varphi\rangle\in \mathbb{P}(\mathcal{H})$ we define the $X_\varphi$-hypersuface by cutting $X$ with a hyperplane $H_\varphi$ defined by the linear form $\langle\varphi|$ (the $X_\varphi$-hypersurface of $X$ is $X\cap H_\varphi \subset X$). We prove that when $|\varphi\rangle$ ranges over the SLOCC entanglement classes, the "worst" possible singular $X_\varphi$-hypersuface with isolated singularities, has…

A critical form of Celtis tree (Ulmaceae) occurring in Sicily

2021

The morphological variability of the Sicilian population of Celtis australis is examined. On the basis of leaf and branching characters, recurrent in various trees growing both in natural and urban environment, a new variety is recognized and described, indicated as Celtis australis var. panormitana. The most significant differential characters and the ecology of the new taxon are reported. Finally, the taxonomic affinities with the two other conspecific taxa are recalled. At the current state of knowledge the new variety is endemic to Sicily.

The Italian Method of la drammatica: its Legacy and Reception

2014

Can small regions construct regional advantages? The case of four Norwegian regions

2012

Accepted version of an article in the journal: European Urban and Regional Studies. Also availble from the publisher at: http://dx.doi.org/10.1177/0969776412439200 The conceptual framework of constructing regional advantage (CRA) is implicitly relevant for large, well-off regions that have strong regional innovation systems, a diversity of industrial sectors and resourceful firms that can partake in global knowledge networks. This paper discusses the extent to which small regions, with less developed regional innovation systems, may also constitute the basis for developing regional advantage. Four cases of regional industries dominated by different innovation modes make up the empirical tes…

Cybernetics of Value Co-creation

2014

The paradigm shift from value creation to value "co-creation" calls for a deeper grasp of organizational learning in marketing theory. This paper adopts a cybernetic view of the process of value co-creation to shed light on its relevant aspects and to supply a framework to implement operations and strategies to foster this process. Can cybernetics help to better understand the process of value co-creation? Can the Viable System Model (Beer, 1979) be a sound approach to shape a more effective value co-creation process able to achieve higher satisfaction and value? In this theoretical paper we will show how cybernetic can be effectively used to give a positive answer to both questions above

Effects of different yeast strains, nutrients and glutathione-rich inactivated yeast addition on the aroma characteristics of Catarratto wines

2021

Catarratto is one of the most common non-aromatic white grape varieties cultivated in Sicily (Southern Italy). In order to improve the aromatic expression of Catarratto wines a trial was undertaken to investigate the effect of yeast strain, nutrition and reduced glutathione. Variables included two Saccharomyces cerevisiae strains, an oenological strain (GR1) and one isolated from honey by-products (SPF52), three different nutrition regimes (Stimula Sauvignon Blanc™ (SS), Stimula Chardonnay™ (SC) and classic nutrition practice), and a specific inactivated yeast rich in reduced glutathione to prevent oxidative processes [Glutastar™ (GIY)] ensuing in ten treatments (T1-T10). Microbiological an…