Foundations of Quantum Gravity : The Role of Principles Grounded in Empirical Reality

When attempting to assess the strengths and weaknesses of various principles in their potential role of guiding the formulation of a theory of quantum gravity, it is crucial to distinguish between principles which are strongly supported by empirical data - either directly or indirectly - and principles which instead (merely) rely heavily on theoretical arguments for their justification. These remarks are illustrated in terms of the current standard models of cosmology and particle physics, as well as their respective underlying theories, viz. general relativity and quantum (field) theory. It is argued that if history is to be of any guidance, the best chance to obtain the key structural features of a putative quantum gravity theory is by deducing them, in some form, from the appropriate empirical principles (analogous to the manner in which, say, the idea that gravitation is a curved spacetime phenomenon is arguably implied by the equivalence principle). It is subsequently argued that the appropriate empirical principles for quantum gravity should at least include (i) quantum nonlocality, (ii) irreducible indeterminacy, (iii) the thermodynamic arrow of time, (iv) homogeneity and isotropy of the observable universe on the largest scales. In each case, it is explained - when appropriate - how the principle in question could be implemented mathematically in a theory of quantum gravity, why it is considered to be of fundamental significance and also why contemporary accounts of it are insufficient.Comment: 21 pages. Some (mostly minor) corrections. Final published versio

Incorporating local sustainability indicators into structures of local governance: a review of the literature

Too often studies about sustainability indicators focus either on the science that goes into indicator development seeking to make them rational and relevant or on the soft impacts such as social capital, community empowerment or capacity building that are outcomes of their use. When attention is turned to what effect they have on policy, it is often difficult to discern any link between their use and policy change. This paper seeks to address this problem by consolidating current thinking on indicators and asking the question: How far have notions of governance been incorporated into current research into indicators? The answer to this question has implications for the continuing utility of indicators as policy tools, not only in so far as they are able to aid the evaluation of policy, but also, and arguably more importantly, in how they are able to facilitate relationships between actors and act a catalyst around which various contested meanings of sustainability can be evaluated