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Search Results: 1 - 10 of 7743 matches for " Michele Rossi "
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Catalysis by Gold Geoffrey C Bond, Catherine Louis, David T Thompson
Michele Rossi
Gold Bulletin , 2006, DOI: 10.1007/BF03215560
Abstract:
Deforming Namikawa's fiber products
Michele Rossi
Mathematics , 2012,
Abstract: The aim of the present paper is giving a detailed analysis of the Kuranishi space of a Namikawa cuspidal fiber product, which in particular improves the conclusion of Y.~Namikawa in Remark 2.8 and Example 1.11 of Namikawa (2002). Moreover an application in the context of deformations of small geometric transitions to conifold transitions is described.
Deforming Geometric Transitions
Michele Rossi
Mathematics , 2013, DOI: 10.1142/S0219887815500590
Abstract: After a quick review of the wild structure of the complex moduli space of Calabi-Yau threefolds and the role of geometric transitions in this context (the Calabi-Yau web) the concept of "deformation equivalence" for geometric transitions is introduced to understand the arrows of the Gross-Reid Calabi-Yau web as deformation-equivalence classes of geometric transitions. Then the focus will be on some results and suitable examples to understand under which conditions it is possible to get "simple" geometric transitions, which are almost the only well-understood geometric transitions both in mathematics and in physics.
On a remark by Y. Namikawa
Michele Rossi
Mathematics , 2008,
Abstract: The aim of the present paper is on the one hand to produce examples supporting the conclusion of Y. Namikawa in Remark 2.8 of \cite{N} and improving considerations of Example 1.11 of the same paper. On the other hand, it is intended to give a geometric interpretation of the rigidity properties of some trees of exceptional rational curves, as observed by Namikawa, which can be obtained by factorizing small resolutions through nodal threefolds.
Analytic equivalence of geometric transitions
Michele Rossi
Mathematics , 2008,
Abstract: In this paper \emph{analytic equivalence} of geometric transition is defined in such a way that equivalence classes of geometric transitions turn out to be the \emph{arrows} of the \cy web. Then it seems natural and useful, both from the mathematical and physical point of view, look for privileged arrows' representatives, called \emph{canonical models}, laying the foundations of an \emph{analytic} classification of geometric transitions. At this purpose a numerical invariant, called \emph{bi--degree}, summarizing the topological, geometric and physical changing properties of a geometric transition, is defined for a large class of geometric transitions.
Homological Type of Geometric Transitions
Michele Rossi
Mathematics , 2010,
Abstract: The present paper gives an account and quantifies the change in topology induced by small and type II geometric transitions, by introducing the notion of the \emph{homological type} of a geometric transition. The obtained results agree with, and go further than, most results and estimates, given to date by several authors, both in mathematical and physical literature.
A rigidity theorem for small resolutions
Michele Rossi
Mathematics , 2012,
Abstract: This paper presents a rigidity property of the exceptional locus of some kind of small birational contractions. An application in the context of geometric transitions and Calabi-Yau threefolds moduli space is then given, with some physical implication in studying the so-called Vacuum Degeneracy Problem.
Geometric Transitions
Michele Rossi
Mathematics , 2004, DOI: 10.1016/j.geomphys.2005.09.005
Abstract: The purpose of this paper is to give, on one hand, a mathematical exposition of the main topological and geometrical properties of geometric transitions, on the other hand, a quick outline of their principal applications, both in mathematics and in physics.
The cubic period-distance relation for the Kater reversible pendulum
Michele Rossi,Lorenzo Zaninetti
Physics , 2005, DOI: 10.2478/BF02475618
Abstract: We describe the correct cubic relation between the mass configuration of a Kater reversible pendulum and its period of oscillation. From an analysis of its solutions we conclude that there could be as many as three distinct mass configurations for which the periods of small oscillations about the two pivots of the pendulum have the same value. We also discuss a real compound Kater pendulum that realizes this property.
Linear and Non Linear Effects on the Newtonian Gravitational Constant as deduced from the Torsion Balance
Michele Rossi,Lorenzo Zaninetti
Physics , 2008, DOI: 10.1142/S0217751X07037329
Abstract: The Newtonian gravitational constant has still 150 parts per million of uncertainty. This paper examines the linear and nonlinear equations governing the rotational dynamics of the torsion gravitational balance. A nonlinear effect modifying the oscillation period of the torsion gravitational balance is carefully explored.
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