Hamiltonian lattice QCD at finite chemical potential

At sufficiently high temperature and density, quantum chromodynamics (QCD) is expected to undergo a phase transition from the confined phase to the quark-gluon plasma phase. In the Lagrangian lattice formulation the Monte Carlo method works well for QCD at finite temperature, however, it breaks down at finite chemical potential. We develop a Hamiltonian approach to lattice QCD at finite chemical potential and solve it in the case of free quarks and in the strong coupling limit. At zero temperature, we calculate the vacuum energy, chiral condensate, quark number density and its susceptibility, as well as mass of the pseudoscalar, vector mesons and nucleon. We find that the chiral phase transition is of first order, and the critical chemical potential is $\mu_C =m_{dyn}^{(0)}$ (dynamical quark mass at $\mu=0$). This is consistent with $\mu_C \approx M_N^{(0)}/3$ (where $M_N^{(0)}$ is the nucleon mass at $\mu=0$).Comment: Final version appeared in Phys. Rev.

Strengthening the Role of Academic Institutions and Innovation Brokers in Agri-Food Innovation : Towards Hybridisation in Cross-Border Cooperation

Existing research suggests that regions can develop their long-term competitive advantage through well-functioning interregional innovation cooperation. In this article, we use the example of innovation in small and medium-sized agri-food enterprises (SMEs) to scrutinise and compare regional innovation approaches on each side of the Dutch-German border and explore how they can converge into a cross-border innovation space. Particular attention is paid to the role of academic institutions and innovation brokers in creating a common innovation space. We explore how differences between two cross-border regions can be harnessed to enhance the impact of innovation, and how this may lead to what we describe as hybridisation effects. In the empirical analysis, we apply the concept of hybridisation to a cross-border innovation space, something that, as far as we are aware, has not been done before. We empirically ground the concepts of a cross-border innovation space and hybridisation and illustrate how relative regional strengths can lead to hybridisation effects. We conclude that differences in economic structures, institutional set-ups, visions and identities inherent in cross-border spaces are not only hindrances, but also opportunities, and we highlight the importance of these complementary strengths and the potential for their strategic use by regional innovation actors. Our findings are highly relevant for the further development of the Interreg Europe programme and the implementation of the EU's Territorial Agenda 2030.Peer reviewe

Light, the universe and everything – 12 Herculean tasks for quantum cowboys and black diamond skiers

The Winter Colloquium on the Physics of Quantum Electronics (PQE) has been a seminal force in quantum optics and related areas since 1971. It is rather mind-boggling to recognize how the concepts presented at these conferences have transformed scientific understanding and human society. In January 2017, the participants of PQE were asked to consider the equally important prospects for the future, and to formulate a set of questions representing some of the greatest aspirations in this broad field. The result is this multi-authored paper, in which many of the world’s leading experts address the following fundamental questions: (1) What is the future of gravitational wave astronomy? (2) Are there new quantum phases of matter away from equilibrium that can be found and exploited – such as the time crystal? (3) Quantum theory in uncharted territory: What can we learn? (4) What are the ultimate limits for laser photon energies? (5) What are the ultimate limits to temporal, spatial and optical resolution? (6) What novel roles will atoms play in technology? (7) What applications lie ahead for nitrogen-vacancy centres in diamond? (8) What is the future of quantum coherence, squeezing and entanglement for enhanced super-resolution and sensing? (9) How can we solve (some of) humanity’s biggest problems through new quantum technologies? (10) What new understanding of materials and biological molecules will result from their dynamical characterization with free-electron lasers? (11) What new technologies and fundamental discoveries might quantum optics achieve by the end of this century? (12) What novel topological structures can be created and employed in quantum optics

Are Private Equity Investors Good or Evil?

The paper investigates the motives of activity (entry and exit) of Private Equity (PE) investors in European companies. Investment of a PE firm is not viewed unambiguously. First, it is claimed that PE investment is made for the sake of seeking short-term gains by taking control and utilizing the company's resources. Second, a PE firm invests because of prior identification of chances to add value to the company. We attempt to resolve these two conflicting conjectures. We use the Bureau van Dijk's Amadeus database of very large, large and medium-sized European companies. Our major results can be summarized as follows. First, PE firms are less willing to enter the firm if there is already a blocking majority, and they are more likely to leave the firm if control cannot be overtaken. Second, less mature firms are less able to lure a PE firm to invest, thus indicating a safe strategy of PE investors. Third, we do not find empirical evidence that a PE investor comes in to strip a firm of its equity. On the other hand, PE investors are likely to leave the company if it deteriorates in terms of returns and cash. Finally, when comparing the activity of PE and other financial investors, we find essential differences in choosing the field and environment of activity

The Budget Constraint in the Governance of Organizations

The paper suggests a partial solution to the disjunction between the institutional environment and the institutions of governance by considering the budget constraint. This approach is put in the perspective of the comparative analysis of economic organizations as discrete structural alternatives. The budget constraint presents a whole range of alternative values that are distinct by different transaction costs that organizations meet. Following different values of budget constraint, bounded rationality and opportunism are allocated to alternative uses and asset specificity takes different forms. This approach requires that the discriminating alignment solution considers the prevailing value of the budget constraint, which opens the need for a comparative perspective on efficacious organizational governance. A second level of governance is corporate governance. The debate over corporate governance is centered around decision-making power and the existence of quasi-rents that organizations produce. Given different values of the budget constraint, the definition of what are efficacious systems of decision-making power and appropriation of quasi-rents are distinct in the shareholder value and the stakeholder interest paradigms

Cross-border interaction survey: cross-border business interaction and the role of cross-border institutions in the European Union

The objective of this research was to explore hampering effects for cross-border business interaction and the role of cross-border institutions. We analysed the data to investigate the relation between factors that define cross-border business interaction and innovativeness. Therefore, we operationalized thirty-five factors which potentially influence cross-border business interaction through a survey in European cross-border regions. Additional data was collected describing the role of the cross-border institutions

Innovation histories – regional influences during developing agri-food products

Company internal and external (i.e. regional) factors influence the innovation procuess. The objective was to investigate how regional factors affect product innovation proceses of agri-food enterprises located in a cross-border region. We conducted interviews following the approach of innovation histories (i.e. retrospective analysis)

Innovation histories – regional influences during developing agri-food products

Company internal and external (i.e. regional) factors influence the innovation procuess. The objective was to investigate how regional factors affect product innovation proceses of agri-food enterprises located in a cross-border region. We conducted interviews following the approach of innovation histories (i.e. retrospective analysis)