Multiplicity Dependence of Two-Particle Correlations in Proton-Proton Collisions Measured with ALICE at the LHC

We investigate properties of jets in proton-proton collisions using two-particle angular correlations. By choosing an analysis approach based on two-particle angular correlations, also the properties of low-energetic jets can be accessed. Observing the strength of the correlation as a function of the charged particle multiplicity reveals jet fragmentation properties as well as the contribution of jets to the overall charged particle multiplicity. Furthermore, the analysis discloses information on the underlying multiple parton interactions. We present results from proton-proton collisions at the center-of-mass energies $\sqrt{s}$ = 0.9, 2.76, and 7.0 TeV recorded by the ALICE experiment. The ALICE data are compared to Pythia6, Pythia8, and Phojet simulations.Comment: To appear in the proceedings of the 24th Rencontres de Blois, Particle Physics and Cosmology, 2012, 4 pages, 8 figure

Concurrent Credit Portfolio Losses

We consider the problem of concurrent portfolio losses in two non-overlapping credit portfolios. In order to explore the full statistical dependence structure of such portfolio losses, we estimate their empirical pairwise copulas. Instead of a Gaussian dependence, we typically find a strong asymmetry in the copulas. Concurrent large portfolio losses are much more likely than small ones. Studying the dependences of these losses as a function of portfolio size, we moreover reveal that not only large portfolios of thousands of contracts, but also medium-sized and small ones with only a few dozens of contracts exhibit notable portfolio loss correlations. Anticipated idiosyncratic effects turn out to be negligible. These are troublesome insights not only for investors in structured fixed-income products, but particularly for the stability of the financial sector

Lie Algebras and the Dimension Problem

The dimension subgroup problem and the Ore conjecture are two group theoretical problems. In this thesis, translations of these problems to Lie algebras are analyzed and partially solved.2021-11-1

Chapter Funduq, Fondaco, Feitoria. The Portuguese Contribution to the Globalisation of an Institution of Overseas Trade

A particular kind of institutions contributed importantly to the organisation of overseas trade: funduqs and fondacos which originated around the medieval Mediterranean. This article aims to contribute to the debate on these institutions. This will be done by looking at the Portuguese feitoria, which may be considered as the missing link between the medieval Mediterranean institutions known as funduqs and fondacos and the early modern factories overseas. This allows to shed new light on relations and entanglements between different seascapes and thus to contribute to the fields of new institutional economics and global history