Cheeger's energy on the Harmonic Sierpinski Gasket

Koskela and Zhou have proven that, on the harmonic Sierpinski gasket with Kusuoka's measure, the "natural" Dirichlet form coincides with Cheeger's energy. We give a different proof of this result, which uses the properties of the Lyapounov exponent of the gasket

Entanglement in dissipative dynamics of identical particles

Entanglement of identical massive particles recently gained attention, because of its relevance in highly controllable systems, e.g. ultracold gases. It accounts for correlations among modes instead of particles, providing a different paradigm for quantum information. We prove that the entanglement of almost all states rarely vanishes in the presence of noise, and analyse the most relevant noise in ultracold gases: dephasing and particle losses. Furthermore, when the particle number increases, the entanglement decay can turn from exponential into algebraic

Prediction of beauty particle masses with the heavy quark effective theory (II)

The effective theory for heavy quarks has additional symmetries with respect to QCD, which relate charm and beauty hadron masses. Assuming the spectrum of charmed particles, we predicted in a previous work the masses of some beauty particles. The predictions of the Lambda_b mass, M(Lambda_b)=5630 MeV, and of the B_s mass, M(B_s)=5379 MeV, are in agreement with present experimental data. We continue this work using recent experimental data on charm hadron masses. The results are: M(Sigma_b)=5822+-6 MeV, M(Sigma_b*)-M(Sigma_b)=33+-3 MeV, M(Omega_b)=6080+-7 MeV, M(Omega_b*)-M(Omega_b)=32+-3 MeV, M(Lambda_b*)=5945+-3 MeV, M(Lambda_b**)-M(Lambda_b*)=15+-1 MeV. When experimental data for beauty hadron masses are available, a comparison with the theoretical values allows a quantitative estimate of the corrections to the static theory, which contain informations on hadron dynamics at low energy.Comment: 8 pages, LaTex Version 2.0

Decays of the f0(1370) scalar glueball candidate in pp Central Exclusive Production (CEP) and in antiproton annihilations at rest

Decays into two charged pions of the f0(1370) are the main source of an isolated structure localized between 1.2 and 1.5 GeV in the two charged pions mass spectrum measured in pp Central Exclusive Production (CEP) at 200 GeV at very low four momentum transfer ltl by the STAR experiment. These data confirm in the two charged pions decay channel the existence of the f0(1370) as an isolated well identified structure previously observed in K+K-, KsKs, 4 charged pions, two charged and two neutral pions and 4 neutral pions decays measured in antiproton annihilations at rest. The ensemble of these data point at a high gluon content of the f0(1370). CEP interactions at higher energies favour production of 0++ and 2++ mesons. Selection of events with lower ltl at both proton vertices suppresses 2++ structures. LHC runs dedicated to pp CEP measurements at low ltl could then provide a unique source of all the low energy scalars. This would make it clear if and where scalar gluonium is resident and the nature (composition in terms of quarks, antiquarks and gluons) of f0(500), f0(980), f0(1370), f0(1500) and f0(1710).Comment: 8 pages, 5 figures, presented at QCD@Work-International Workshop on QCD Theory and Experiment, 25-28 June 2018, Matera, Italy (to be published in Proceedings). arXiv admin note: text overlap with arXiv:1809.0449

Why do scientists create academic spin-offs? The influence of the context

The aim of this work is to examine the nature of academic spin-offs in a specific context: the Emilia-Romagna region (Italy). More specifically we investigate the individual reasons as to explain why scientists create academic spin-offs and how the creation process unfolds. Most economics and management literature on the topic considers the technological characteristics of such a choice, although recently the individual motivations behind the creation of such ventures have been investigated. However, less attention has been paid to the social and contextual dimensions of the matter. This study relates contextual characteristics to individual motivation. In particular it is argued that the funding constraints of the Italian academic environment, the low level of demand for doctorate holders within the Italian public and private sectors and the presence of favourable supporting policy tools in the region analysed, play a fundamental role in shaping the individual motivation of scientists in choosing this option. By way of a multiple case study research this work provides evidence that the academic spin-off in Emilia-Romagna is, for young scientists, a way to escape the bottlenecks of the Italian academic system allowing them to work in their field of expertise. This paper builds on the research regarding individual reasoning underlying personal decisions to create an academic spin-off and the need to analyse the phenomenon in relation to its context. Finally some policy implications are put forth