2,933 research outputs found

    A hybrid-chiral soliton model with broken scale invariance for nuclear matter

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    We present a model for describing nuclear matter at finite density based on quarks interacting with chiral fields, sigma and pion. The chiral Lagrangian also includes a logarithmic potential, associated with the breaking of scale invariance. We provide results for the soliton in vacuum and at finite density, using the Wigner-Seitz approximation. We show that the model can reach higher densities respect to the Linear-sigma model, up to approximately 3 rho_0 for m_sigma=1200 MeV.Comment: 7 pages, 3 figures, Proceedings of Cortona 2011 XIII Convegno su Problemi di Fisica Nucleare Teoric

    A chiral quark-soliton model with broken scale invariance for nuclear matter

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    We present a model for describing nuclear matter at finite density based on quarks interacting with chiral fields, \sigma and \pi and with vector mesons introduced as massive gauge fields. The chiral Lagrangian includes a logarithmic potential, associated with the breaking of scale invariance. We provide results for the soliton in vacuum and at finite density, using the Wigner-Seitz approximation. We show that the model can reach higher densities respect to the linear-\sigma model and that the introduction of vector mesons allows to obtain saturation. This result was never obtained before in similar approaches.Comment: 14 pages, 15 figures, 7 tables. Enlarged version including vector meson

    The electron in three-dimensional momentum space

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    We study the electron as a system composed by an electron and a photon, using lowest order perturbation theory. We derive the leading-twist transverse-momentum-dependent distribution functions for both the electron and photon in the dressed electron, thereby offering a three-dimensional description of the dressed electron in momentum space. To obtain the distribution functions, we apply both the formalism of light-front wave function overlap representation and the diagrammatic approach. We perform the calculations both in light-cone gauge and Feynman gauge, and we present a detailed discussion of the role of the Wilson lines to obtain gauge-independent results. We provide numerical results and plots for many of the computed distributions.Comment: 25 pages, 14 figure

    The baryon number two system in the Chiral Soliton Model

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    We study the interaction between two B = 1 states in a Chiral Soliton Model where baryons are described as non-topological solitons. By using the hedgehog solution for the B = 1 states we construct three possible B = 2 configurations to analyze the role of the relative orientation of the hedgehog quills in the dynamics. The strong dependence of the intersoliton interaction on these relative orientations reveals that studies of dense hadronic matter using this model should take into account their implications.Comment: 4 pages, 2 figures, Proceedings for the Conference Few-Body Systems (APFB2011

    Complementarity, Coordination and Credit

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    We consider a start-up firm which applies for a bank loan to implement a project based on complementary activities. The firm has the possibility to improve the complementarity effect by coordinating the activities. Coordination is costly and can be made either by using internal human resources or by hiring a consulting firm. In the former case the choice of coordination is not verifiable by the bank and a moral hazard problem arises, while in the latter information is symmetric. The role of consulting services is thus to mitigate the informational problem. Without consulting, the firm does not coordinate and either obtains no funding or the surplus of the project is not maximized

    The Importance of Being Consulted

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    Does management consulting facilitate the access to credit for start-ups? This paper tries to answer the question by developing a theoretical framework where a firm applies for a bank loan to implement a risky project. The probability of success increases if the firm exerts a costly managerial extra-effort, but the bank is unable to observe such an effort: a moral hazard problem may therefore occur. During an economic downturn the project’s expected profitability is likely to be low relatively to the effort cost. In this case we find that credit is granted only if the bank hires a management consultant, even when the latter does not improve the business practice

    Complementarity, coordination, and credit

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    We consider a start-up firm which applies for a bank loan to implement a project based on complementary activities. The firm has the possibility to improve the complementarity effect by coordinating the activities. Coordination is costly and can be made either by using internal human resources or by hiring a consulting firm. In the former case the choice of coordination is not verifiable by the bank and a moral hazard problem arises, while in the latter information is symmetric. The role of consulting services is thus to mitigate the informational problem. Without consulting, the firm does not coordinate and either obtains no funding or the surplus of the project is not maximized

    Treatments for NAFLD: State of Art

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    Non\u2010alcoholic fatty liver disease (NAFLD) is to date the most common chronic liver dis\u2010 ease in clinical practice and, consequently, a major health problem worldwide. It affects approxi\u2010 mately 30% of adults in the general population and up to 70% of patients with type 2 diabetes (T2DM). Despite the current knowledge of the epidemiology, pathogenesis, and natural history of NAFLD, no specific pharmacological therapies are until now approved for this disease and, con\u2010 sequently, general strategies have been proposed to manage it. They include: (a) lifestyle change in order to promote weight loss by diet and physical activity, (b) control of the main cardiometabolic risk factors, (c) correction of all modifiable risk factors leading the development and progression of advanced forms of NAFLD, and (d) prevention of hepatic and extra\u2010hepatic complications. In the last decade, several potential agents have been widely investigated for the treatment of NAFLD and its advanced forms\u2014shedding some light but casting a few shadows. They include some glu\u2010 cose\u2010lowering drugs (such as pioglitazone, glucagon\u2010like peptide\u20101 (GLP\u20101) receptor agonists, so\u2010 dium\u2010glucose co\u2010transporter\u20102 (SGLT\u20102) inhibitors), antioxidants (such as vitamin E), statins or other lipid lowering agents, bile and non\u2010bile acid farnesoid X activated receptor (FXR) agonists, and others. This narrative review discusses in detail the different available approaches with the potential to prevent and treat NAFLD and its advanced forms

    Recent Developments in NAFLD

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    : The aim of our Special Edition, entitled "Nonalcoholic Fatty Liver Disease/Metabolic Associated Fatty Liver Disease: New Insights", is to point out recent developments in the area of NAFLD pathogenesis and treatment [...]

    A call to action for fatty liver disease

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