Trade, Trust and Institutions

To investigate the relation between trust and formal institutions, we analyze bilateral trade patterns in a sample of 16 European countries between 1996-2009. Trust in trading partners has a significant positive effect on bilateral trade. However, our results suggest that trust and formal institutions are substitutes, as the positive effect of trust on trade is conditional on the quality of formal institutions. When the institutional quality of the importing country increases, the effect of trust on trade decreases, and eventually becomes insignificant. The decline in the effect of trust on trade is less when the exporting country’s institutional quality improves.trust, international trade, institutional quality

Models of massive gravity in three dimensions

De geaccepteerde theorie van de zwaartekracht is de algemene relativiteitstheorie, ontwikkeld door Einstein in 1917. Deze theorie voorspelt de werking van de zwaartekracht zeer nauwkeurig, ondanks het feit dat Einstein niet beschikte over precieze meetgegevens toen hij zijn theorie vormgaf. Puur geluk? Het blijkt van niet. Past men Einstein's theorie namelijk aan, dan stuit men al snel op grote problemen. Een van die problemen is het ontbreken van unitariteit, de garantie dat de kansen van alle mogelijk uitkomsten in een systeem optellen tot een. De algemene relativiteitstheorie lijkt de enige bruikbare theorie. In dit proefschrift gaan we toch op zoek naar alternatieven voor de algemene relativiteitstheorie. Daarbij proberen we vooral om unitariteit in stand te houden. We richten ons in het bijzonder op modellen voor zwaartekracht in 2+1 dimensies met een massief graviton

Three-Dimensional Tricritical Gravity

We consider a class of parity even, six-derivative gravity theories in three dimensions. After linearizing around anti-de Sitter space, the theories have one massless and two massive graviton solutions for generic values of the parameters. At a special, so-called tricritical, point in parameter space the two massive graviton solutions become massless and they are replaced by two solutions with logarithmic and logarithmic-squared boundary behavior. The theory at this point is conjectured to be dual to a rank-3 Logarithmic Conformal Field Theory (LCFT) whose boundary stress tensor, central charges and new anomaly we calculate. We also calculate the conserved Abbott-Deser-Tekin charges. At the tricritical point, these vanish for excitations that obey Brown-Henneaux and logarithmic boundary conditions, while they are generically non-zero for excitations that show logarithmic-squared boundary behavior. This suggests that a truncation of the tricritical gravity theory and its corresponding dual LCFT can be realized either via boundary conditions on the allowed gravitational excitations, or via restriction to a zero charge sub-sector. We comment on the structure of the truncated theory.Comment: 37 pages, 2 figures; v2: added reference; published versio

Meten is weten anno 2015 : Ontwikkeling van de WUR Minimale Data Set tot 2015 voor het meten van bodemkwaliteit in de open teelten als basis voor verdere ontwikkeling.

Binnen deze studie hebben we informatie verzameld over indicatoren welke de kwaliteit van landbouwgronden (productiefunctie) afbeelden. We hebben een overzicht gemaakt van beschikbare indicatorsets voor bodemkwaliteit. En vandaaruit hebben we in discussies met onderzoekers en adviseurs eerst een longlist aan indicatoren gemaakt die vervolgens omgewerkt is tot een korte lijst van direct toepasbare indicatoren door boeren

A Non-relativistic Logarithmic Conformal Field Theory from a Holographic Point of View

We study a fourth-order derivative scalar field configuration in a fixed Lifshitz background. Using an auxiliary field we rewrite the equations of motion as two coupled second order equations. We specialize to the limit that the mass of the scalar field degenerates with that of the auxiliary field and show that logarithmic modes appear. Using non-relativistic holographic methods we calculate the two-point correlation functions of the boundary operators in this limit and find evidence for a non-relativistic logarithmic conformal field theory at the boundary.Comment: 17 pages, v2 : refs. adde

Unitary Truncations and Critical Gravity: a Toy Model

We investigate a higher-derivative scalar field model in a fixed d+1 dimensional AdS background as a toy model for a gravitational dual to a higher-rank logarithmic CFT. The holographic two-point correlation functions on the boundary agree with higher-rank LCFT correlation functions. For odd rank, the theory allows for a truncation to a nontrivial subspace with non-negative scalar product. We discuss possible implications for higher-derivative critical gravity theories.Comment: 23 pages. As accepted for publication in JHE

Small chromosomal regions position themselves autonomously according to their chromatin class

The spatial arrangement of chromatin is linked to the regulation of nuclear processes. One striking aspect of nuclear organization is the spatial segregation of heterochromatic and euchromatic domains. The mechanisms of this chromatin segregation are still poorly understood. In this work, we investigated the link between the primary genomic sequence and chromatin domains. We analyzed the spatial intranuclear arrangement of a human artificial chromosome (HAC) in a xenospecific mouse background in comparison to an orthologous region of native mouse chromosome. The two orthologous regions include segments that can be assigned to three major chromatin classes according to their gene abundance and repeat repertoire: (1) gene-rich and SINE-rich euchromatin; (2) gene-poor and LINE/LTR-rich heterochromatin; and (3) genedepleted and satellite DNA-containing constitutive heterochromatin. We show, using fluorescence in situ hybridization (FISH) and 4C-seq technologies, that chromatin segments ranging from 0.6 to 3 Mb cluster with segments of the same chromatin class. As a consequence, the chromatin segments acquire corresponding positions in the nucleus irrespective of their chromosomal context, thereby strongly suggesting that this is their autonomous property. Interactions with the nuclear lamina, although largely retained in the HAC, reveal less autonomy. Taken together, our results suggest that building of a functional nucleus is largely a self-organizing process based on mutual recognition of chromosome segments belonging to the major chromatin classes

Understanding management gurus and historical narratives: The benefits of a historic turn in management and organization studies

A historic turn in organization studies requires a basic theoretical understanding of ‘doing history’ and an appreciation of the centrality of narrative in history. Following the cultural turn in history, narrativist historians and philosophers of history such as Hayden White, Frank Ankersmit and Paul Ricoeur have made the case that narrative is an essential and unavoidable component in history. We demonstrate the persuasive capacity of narrative through a narrativist critique of three best-selling ‘management gurus’. This analysis illustrates the following: (1) the narrative features of popular organizational theories; (2) the basis of the success of guru literature; and (3) why gurus and organizational scientists themselves do not understand the narratological mechanisms behind their success. Finally, we maintain that historical narrativism offers the possibility for positioning organizational history as a highly relevant field for management academics, gurus and even managers, providing support for a historic turn