Hybrid star structure with the Field Correlator Method

We explore the relevance of the color-flavor locking phase in the equation of state (EoS) built with the Field Correlator Method (FCM) for the description of the quark matter core of hybrid stars. For the hadronic phase, we use the microscopic Brueckner-Hartree-Fock (BHF) many-body theory, and its relativistic counterpart, i.e. the Dirac-Brueckner (DBHF). We find that the main features of the phase transition are directly related to the values of the quark-antiquark potential $V_1$, the gluon condensate $G_2$ and the color-flavor superconducting gap $\Delta$. We confirm that the mapping between the FCM and the CSS (constant speed of sound) parameterization holds true even in the case of paired quark matter. The inclusion of hyperons in the hadronic phase and its effect on the mass-radius relation of hybrid stars is also investigated.Comment: 15 pages, 8 figures ; revised version to be published in the EPJA Topical Issue on "Exotic Matter in Neutron Stars

The Emergence of the ‘Social Economy’: the Australian not-for-profit sector in transition

The Not-for-Profit (NFP) sector in Australia is currently in transition. There is a growing recognition, in Australia and worldwide, that government and philanthropic funds are insufficient to address the problems facing society; as well as demands for increased accountability and demonstration of improved outcomes from traditional funding to the non-profit sector. There is also a growing global interest in social enterprises, socially responsible investment, and, in particular, impact investing – where investors aim to achieve a blend between commercial value and social impact. These trends are contributing to the emergence of new organizational forms, partnerships and financial products, and as a consequence, NFP organizations are becoming just one form of organization within the broader spectrum of organizations and activity described as the ‘social economy’. This research project begins to explore this transition by analysing a sample of organizations in Australia that while having formal non-profit structures, identified themselves as social enterprises in a bid for funding from one of Australia’s leading corporate foundations, the Westpac Foundation. The research builds on previous studies, yet also enables more detailed data on the leadership, governance, human resources, financial challenges, and focus of activities of social enterprises and raises questions about the future of the sector and the social economy

Tower sets and other configurations with the Cohen-Macaulay property

Some well-known arithmetically Cohen-Macaulay configurations of linear varieties in Pr as k-configurations, partial intersections and star configurations are generalized by introducing tower schemes. Tower schemes are reduced schemes that are a finite union of linear varieties whose support set is a suitable finite subset of Z+c called tower set. We prove that the tower schemes are arithmetically Cohen-Macaulay and we compute their Hilbert function in terms of their support. Afterwards, since even in codimension 2 not every arithmetically Cohen-Macaulay squarefree monomial ideal is the ideal of a tower scheme, we slightly extend this notion by defining generalized tower schemes (in codimension 2). Our main result consists in showing that the support of these configurations (the generalized tower set) gives a combinatorial characterization of the primary decomposition of the arithmetically Cohen-Macaulay squarefree monomial ideals

Motivations for volunteerism, satisfaction, and emotional exhaustion: The moderating effect of volunteers' age

This investigation aims to explore the moderating role of volunteers' age in the relation between motivations for volunteering and, respectively, satisfaction with volunteerism and emotional exhaustion. A longitudinal study was conducted with a sample of 241 Spanish healthcare volunteers. Results show that volunteers' age moderates the relations between social motivations and satisfaction, and social motivations and volunteers' emotional exhaustion, and also between growth motivations and satisfaction, and volunteers' emotional exhaustion. The relationships between security motivations and satisfaction and emotional exhaustion are not moderated by age. Our findings underline that, for younger volunteers, satisfaction decreases when social motives are high, rather than low, and, in the opposite, emotional exhaustion increases when growth motives are high, rather than low. For older volunteers, instead, the only significant effect concern satisfaction, which is higher when social motives are high, rather than low

Detection of Contact Binaries Using Sparse High Phase Angle Lightcurves

We show that candidate contact binary asteroids can be efficiently identified from sparsely sampled photometry taken at phase angles >60deg. At high phase angle, close/contact binary systems produce distinctive lightcurves that spend most of the time at maximum or minimum (typically >1mag apart) brightness with relatively fast transitions between the two. This means that a few (~5) sparse observations will suffice to measure the large range of variation and identify candidate contact binary systems. This finding can be used in the context of all-sky surveys to constrain the fraction of contact binary near-Earth objects. High phase angle lightcurve data can also reveal the absolute sense of the spin.Comment: 4 pages, 4 figures, 1 table. Accepted for publication in ApJ