1,721,074 research outputs found
Universal Local Symmetries in Classical Mechanics and Physical Degrees of Freedom
No full textIn a recent paper we have analyzed the role that a universal set of {\it local} symmetries plays in suppressing the superposition principle in classical mechanics via a path integral formulation
of classical mechanics itself. In this paper first we generalize those local symmetries, second we study the role which the gauge fixing plays and
third we put forward the idea of which ones should be the physical degrees of freedom of the theory
Cronin effect and energy conservation constraints in pA collisions at LHC and RHIC
No full textWe evaluate the Cronin effect in pA collisions at the CERN LHC and at RHIC in the framework of Glauber-Eikonal model of initial state multiparton interactions. Taking carefully into account all kinematical constraints of each multi-parton interaction process we obtain a softening of the spectrum of produced partons, improving in this way the agreement of the model with the recent measurements of pi0 production in d+Au collisions at sqrt{s}=200 AGeV
Least-action principle and path-integral for classical mechanics
No full textIn this paper we show how the equations of motion of a superfield, which makes its appearance in a path-integral approach to classical mechanics, can be derived without the need of the least-action principle
Entanglement, super-selection rules and supersymmetric quantum mechanics
No full textIn this paper we show that the energy eigenstates of supersymmetric quantum mechanics (SUSYQM) with non-definite "fermion" number are entangled states. They are "physical states" of the model provided that observables with odd number of spin variablles are allowed in the theory like it happens in the Jaynes-Cummings model. Those states generalize the so-called "spin-Spring" states of the Jaynes-Cummings model which have played an important role in the study of entanglement
FRACTIONAL MOMENTUM CORRELATIONS IN MULTIPLE PRODUCTION OF W BOSONS AND OF B ANTI-B PAIRS IN HIGH ENERGY PP COLLISIONS
No full textAbstract: Multiple parton collisions will represent a rather common feature in pp collisions at the LHC, where regimes with very large momentum transfer may be studied and events rare in lower energy accelerators might occur with a significant rate. A reason of interest in large p(t) regimes is that, differently from low p(t), evolution will induce correlations in x in the multiparton structure functions. We have estimated the cross section of multiple production of W bosons with equal sign, where the correlations in x induced by evolution are particularly relevant, and the cross section of b (b) over barb (b) over bar production, where the effects of evolution are much smaller. Our result is that, in the case of multiple production of W bosons, the terms with correlations may represent a correction of the order of 40% of the cross sections, for pp collisions at 1 TeV c.m. energy, and a correction of the order of 20% at 14 TeV. In the case of b (b) over bar pairs the correction terms
(E)merging layers in Venice : the potential of one landscape and single raw material.
No full text“The difference between past and present [...] is reflected in the fact that the past is experienced now. [...] The individual layers of the city are those which uncovered appear as the indigenous and eternal substance of life, the unchanging pattern” (Rossi, 1984, p. 56).
We always come across something, never nothing. Each place has its atmosphere and history. It is often magnificent and intense; other times, it may be initially elusive. But if we keep listening, sooner or later, every place will start talking. The place always dictates the result; we never try to impose something not rooted in it. In this way, we discover, interpret and add new stories to what already exists. Architecture always refers to nature even when nature is not noticeable. Present paper analyses, through the description of a didactic activity, the concept of Fragility at different layers, environmental, material, and relational. Based on a diverse design approach exemplified by the results of each team of workshop participants, he argues that glass is a resilient material, and this characteristic transforms its superficial fragility into innovative antifragility
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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