Electric charge and potential distribution in twisted multilayer graphene

The specifics of charge screening and electrostatic potential spatial distribution in multilayered graphene films placed in between charged substrates is theoretically analyzed. It is shown that by varying the areal charge densities on the substrates and/or the thickness of the graphene stack one may tune the doped carriers distribution over the system. When the charge densities on the substrates are weak, the carriers distribution and electrostatic potential profile agree with semimetallic properties of graphene. However, when the amount of the donated charge is sufficiently large the transition to a metallic-like behavior of the graphene layers occurs. The possibilities for experimental observation of the predicted transition are discussed.Comment: 10 pages, 5 figures. arXiv admin note: substantial text overlap with arXiv:1311.050

Looking for anomalous gamma-gamma-H and Z-gamma-H couplings at future linear collider

We consider the possibility of studying anomalous contributions to the gamma-gamma-H and Z-gamma-H vertices through the process e-gamma--> e-H at future e-gamma linear colliders, with Sqrt(S)=500-1500 GeV. We make a model independent analysis based on SU(2)xU(1) invariant effective operators of dim=6 added to the standard model lagrangian. We consider a light Higgs boson (mostly decaying in bar(b)-b pairs), and include all the relevant backgrounds. Initial e-beam polarization effects are also analyzed. We find that the process e-gamma--> e-H provides an excellent opportunity to strongly constrain both the CP-even and the CP-odd anomalous contributions to the gamma-gamma-H and Z-gamma-H vertices.Comment: LaTeX, 33 pages, 16 eps figures, extended section

On the Chinese Exchange Rate Regime: an Attempt to Flexibility during 2015

This study will demonstrate, through an econometric and asset allocation approach, if and how the Chinese exchange rate regime was changing during 2015. Particularly, China to improve its exchange rate formation system implemented, during July and August 2015, three depreciation as a step toward a market-oriented exchange rate. This situation, along with the new right of the RMB to be an international currency in SDR should generate a loss of weight about the USD in the Chinese basket peg. For this reason, moving from Frankel-Wei’s basic econometric model - but with some appropriate changes - our objective is to verify if the Chinese monetary policy about the exchange rate has affected the inner balance of the Chinese basket-peg leading it towards a flexible exchange rate regime

Geometria e progetto. Ipotesi di riuso per il palazzo Vernazza a Castri

Dall’Antichità al Rinascimento, da Pitagora a Keplero, aritmetica, geometria, musica e astronomia hanno indagato il numero, lo spazio, il suono e il movimento dei corpi celesti. Queste quattro discipline venivano già pensate e insegnate da Platone come un insieme unitario, che fondeva lo studio degli oggetti matematici con l’aspirazione filosofica al vero, al bello e al bene. Il Quadrivium viene reinterpretato in questo lavoro e l’edificio diviene testimone, testo parlante, memoria scritta in molti linguaggi e restituisce al lettore di oggi un patrimonio un tempo riservato a pochi. Il Palazzo Vernazza di Castri di Lecce è studiato in questa sperimentazione progettuale a partire dalla riscoperta della sua misura storica, con il contributo delle moderne tecniche di rilievo che hanno supportato questi studi, allo scopo di assegnare al progetto contemporaneo una base linguistica invisibile, un alfabeto che strutturi la costruzione del nuovo

Aspects of GMSB Phenomenology at TeV Colliders

The status of two on-going studies concerning important aspects of the phenomenology of gauge-mediated supersymmetry breaking (GMSB) models at TeV colliders is reported. The first study deals with the characteristics of the light Higgs boson spectrum allowed by the (minimal and non-minimal) GMSB framework. Today's most accurate GMSB model generation and two-loop Feynman-diagrammatic calculation of m_h have been combined. The Higgs masses are shown in dependence of various model parameters at the messenger and electroweak scales. In the minimal model, an upper limit on m_h of about 124 GeV is found for m_t = 175 GeV. The second study is focused on the measurement of the fundamental SUSY breaking scale sqrt(F) at the LHC in the GMSB scenario where a stau is the next-to-lightest SUSY particle (NLSP) and decays into a gravitino with c*tau_NLSP in the range 0.5 m to 1 km. This implies the measurement of mass and lifetime of long lived sleptons. The identification is performed by determining the time of flight in the ATLAS muon chambers. Accessible range and precision on sqrt(F) achievable with a counting method are assessed.Comment: 22 pages, 9 figures (12 eps files). Report of the GMSB SUSY Working Group, Workshop "Physics at TeV Colliders", Les Houches, 7-18 June 1999. Revised version v3: A few typos correcte