The pp-adic Shintani cocycle

The Shintani cocycle on \GL_n(\Q), as constructed by Hill, gives a cohomological interpretation of special values of zeta functions for totally real fields of degree $n$. We give an explicit criterion for a specialization of the Shintani cocycle to be $p$-adically interpolable. As a corollary, we recover the results of Deligne-Ribet, Cassou Nogu\`es and Barsky on the construction of $p$-adic $L$-functions attached to totally real fields.Comment: 19 pages. v2: Corrected several typo

Orientifolds of Warped Throats from Toric Calabi-Yau Singularities

We study the complex deformations of orientifolds of D3-branes at toric CY singularities, using their description in terms of dimer diagrams. We describe orientifold quotients that have fixed lines or fixed points in the dimer, and characterize the possibilities to deform them in terms of the behaviour of zig-zag paths under the orientifold symmetry. The resulting models are holographic duals to warped throats with orientifold planes. Our systematic construction provides a general class of configurations which includes models recently appeared in the context of de Sitter uplift by nilpotent goldstino or dynamical supersymmetry breaking.Comment: 39 pages, 23 figures. v2: minor corrections don

Credit constraints, firms' precautionary investment and the business cycle

This paper studies the macroeconomic implications of firms' investment composition choices in the presence of credit constraints. Following a negative and persistent aggregate productivity shock, firms shift into short-term investments because they produce more pledgeable output and because they help alleviate future borrowing constraints. This produces a short-run dampening of the effects of the shock, at the expense of lower long-term investment and future output, relative to an economy with no credit market imperfections. The effects are exacerbated by a steepening of the term structure of interest rates that further encourages a shift towards short-term investments in the short-run. Small temporary shocks to the severity of financing frictions generate large and long-lasting effects on output through their impact on the composition of investment. A positive financial shock produces much stronger effects than an identical negative shock, while the responses to positive and negative shocks to aggregate productivity are roughly symmetric. Finally, the paper introduces a novel explanation for the countercyclicality of financing constraints of firms.Investment composition, Financial frictions, Business cycles, Idiosyncratic production risk, Firm heterogeneity

Rule-based information integration

In this report, we show the process of information integration. We specifically discuss the language used for integration. We show that integration consists of two phases, the schema mapping phase and the data integration phase. We formally define transformation rules, conversion, evolution and versioning. We further discuss the integration process from a data point of view

Adding HL7 version 3 data types to PostgreSQL

The HL7 standard is widely used to exchange medical information electronically. As a part of the standard, HL7 defines scalar communication data types like physical quantity, point in time and concept descriptor but also complex types such as interval types, collection types and probabilistic types. Typical HL7 applications will store their communications in a database, resulting in a translation from HL7 concepts and types into database types. Since the data types were not designed to be implemented in a relational database server, this transition is cumbersome and fraught with programmer error. The purpose of this paper is two fold. First we analyze the HL7 version 3 data type definitions and define a number of conditions that must be met, for the data type to be suitable for implementation in a relational database. As a result of this analysis we describe a number of possible improvements in the HL7 specification. Second we describe an implementation in the PostgreSQL database server and show that the database server can effectively execute scientific calculations with units of measure, supports a large number of operations on time points and intervals, and can perform operations that are akin to a medical terminology server. Experiments on synthetic data show that the user defined types perform better than an implementation that uses only standard data types from the database server.Comment: 12 pages, 9 figures, 6 table

On uplifts by warped anti-D3-branes

In this note we outline the arguments against the ten-dimensional consistency of the simplest types of KKLT de Sitter vacua, as given in arXiv:1707.08678. We comment on parametrization proposals within four-dimensional supergravity and express our disagreement with the recent criticism by the authors of arXiv:1808.09428.Comment: Latex, revtex, 4 pages, 1 figure, v2: references added, minor clarification