Theology of Creation and Natural Science

The author advocates for the mediating role of philosophy in the dialogues between science and theology, in particular, the dialogues to clarify that the creation of biblical faith is the same entity as the cosmos of scientific study. He points out that most current scientific concepts, such as \'field,\' have a prior history of usage in philosophical discourse, before being modified for usage in scientific contexts. This example, together with associated concepts, holds special promise for developing a contemporary theology of divine presence and action

Modeling Repulsive Gravity with Creation

There is a growing interest in the cosmologists for theories with negative energy scalar fields and creation, in order to model a repulsive gravity. The classical steady state cosmology proposed by Bondi, Gold and Hoyle in 1948, was the first such theory which used a negative kinetic energy creation field to invoke creation of matter. We emphasize that creation plays very crucial role in cosmology and provides a natural explanation to the various explosive phenomena occurring in local (z<0.1) and extra galactic universe. We exemplify this point of view by considering the resurrected version of this theory - the quasi-steady state theory, which tries to relate creation events directly to the large scale dynamics of the universe and supplies more natural explanations of the observed phenomena. Although the theory predicts a decelerating universe at the present era, it explains successfully the recent SNe Ia observations (which require an accelerating universe in the standard cosmology), as we show in this paper by performing a Bayesian analysis of the data.Comment: The paper uses an old SNeIa dataset. With the new improved data, for example the updated gold sample (Riess et al, astro-ph/0611572), the fit improves considerably (\chi^2/DoF=197/180 and a probability of goodness-of-fit=18%

The Price of Anarchy in Cooperative Network Creation Games

In general, the games are played on a host graph, where each node is a selfish independent agent (player) and each edge has a fixed link creation cost \alpha. Together the agents create a network (a subgraph of the host graph) while selfishly minimizing the link creation costs plus the sum of the distances to all other players (usage cost). In this paper, we pursue two important facets of the network creation game. First, we study extensively a natural version of the game, called the cooperative model, where nodes can collaborate and share the cost of creating any edge in the host graph. We prove the first nontrivial bounds in this model, establishing that the price of anarchy is polylogarithmic in n for all values of &#945; in complete host graphs. This bound is the first result of this type for any version of the network creation game; most previous general upper bounds are polynomial in n. Interestingly, we also show that equilibrium graphs have polylogarithmic diameter for the most natural range of \alpha (at most n polylg n). Second, we study the impact of the natural assumption that the host graph is a general graph, not necessarily complete. This model is a simple example of nonuniform creation costs among the edges (effectively allowing weights of \alpha and \infty). We prove the first assemblage of upper and lower bounds for this context, stablishing nontrivial tight bounds for many ranges of \alpha, for both the unilateral and cooperative versions of network creation. In particular, we establish polynomial lower bounds for both versions and many ranges of \alpha, even for this simple nonuniform cost model, which sharply contrasts the conjectured constant bounds for these games in complete (uniform) graphs

Characterizing Natural Fractures and Their Interactions with Hydraulically Induced Fractures

Natural fractures are preexisting micro-cracks and fissures that can have a critical impact on hydraulic fracture treatments in shales. Most shale formations contain natural fractures, but the characteristics of these natural fractures can vary significantly. For example, the natural fractures in the Barnett Shale are mostly narrow, long, and sealed with calcite cement. The natural fractures in the Wolfcamp Shale are much more heterogeneous as a whole, but tend to be clustered in similar groupings based on the lithology of certain areas of the formation. The creation and development of natural fractures prior to any hydraulic fracturing treatments is primarily a function of mineralogy, total organic carbon, and in-situ stresses. During hydraulic fracturing treatments, certain characteristics, such as the relative angle between the natural and hydraulic fractures, the length of the natural fractures, the differential stress of the formation rock, and certain completion design variables, will determine how the natural and induced fractures interact and create a fracture network. The creation of a natural fracture network can have a positive effect on the ultimate hydrocarbon recovery in some cases. Natural fractures provide accumulation space and travel pathways for hydrocarbons, which is critical in low porosity and low permeability shales. However, natural fractures can result in higher rates of fluid leakoff, which will result in less efficient hydraulic fracture treatments overall. Also, natural fractures can provide an undesirable connection to water accumulations, which can negatively impact the economics of a well because of the disposal costs associated with water production. This thesis seeks to characterize natural fractures and also to describe the author's work on a hydraulic fracture simulation software that takes the impact of natural fractures into account.Petroleum and Geosystems Engineerin

Creation's Persistent Voice: Critiquing the Secondary Status

Christianity struggles with the concept that nature/creation is truly revelatory of God, and not merely confirmatory of theological conclusions derived from special revelation or deduced from rational reflection. The result is a stilted and narrow conversation between theology and the natural sciences, with the contribution of creation to knowledge of God being limited to certain well-worn paths. If theology is willing to hold a full-fledged conversation with the natural sciences, it may just find that new metaphors and conceptions of God arise that illuminate our understanding of God in ways that scripture alone cannot. Such conversations must be characterized (on both sides) as serious and tentative, with conclusions never considered to be final, but always open to further conversation as new paradigms emerge

Natural resource scarcity and long-run development: central mechanisms when conditions are seemingly unfavourable

Using a dynamic model with non-renewable natural resources and endogenous knowledge creation, the paper analyses economic development under conditions which are generally considered as most unfavourable. We assume poor substitution between primary input factors, positive population growth and a limited supply of materials in the static part of the framework, as well as natural resources being an essential input into R&D, and constant or decreasing returns to innovative activities in the dynamic part. It is shown that there is an inverse relationship between input substitution and growth-enhancing sectoral change and that labour supply supports economic dynamics through the knowledge-creation effect. A permanent increase in living standards is achievable under free market conditions, but adjustment costs and errors in long-term expectations might impede this development.endogenous technological change, environment, natural resources, sustainability

Spectral gaps in graphene antidot lattices

We consider the gap creation problem in an antidot graphene lattice, i.e. a sheet of graphene with periodically distributed obstacles. We prove several spectral results concerning the size of the gap and its dependence on different natural parameters related to the antidot lattice.Comment: 15 page