2,130 research outputs found
Galactic Potentials
The information contained in galactic rotation curves is examined under a
minimal set of assumptions. If emission occurs from stable circular geodesic
orbits of a static spherically symmetric field, with information propagated to
us along null geodesics, observed rotation curves determine galactic potentials
without specific reference to any metric theory of gravity. Given the
potential, the gravitational mass can be obtained by way of an anisotropy
function of this field. The gravitational mass and anisotropy function can be
solved for simultaneously in a Newtonian limit without specifying any specific
source. This procedure, based on a minimal set of assumptions, puts very strong
constraints on any model of the "dark matter".Comment: A somewhat longer form of the final version to appear in Physical
Review Letters.Clarification and further reference
Daisyworld: a review
Daisyworld is a simple planetary model designed to show the long-term effects of coupling between life and its environment. Its original form was introduced by James Lovelock as a defense against criticism that his Gaia theory of the Earth as a self-regulating homeostatic system requires teleological control rather than being an emergent property. The central premise, that living organisms can have major effects on the climate system, is no longer controversial. The Daisyworld model has attracted considerable interest from the scientific community and has now established itself as a model independent of, but still related to, the Gaia theory. Used widely as both a teaching tool and as a basis for more complex studies of feedback systems, it has also become an important paradigm for the understanding of the role of biotic components when modeling the Earth system. This paper collects the accumulated knowledge from the study of Daisyworld and provides the reader with a concise account of its important properties. We emphasize the increasing amount of exact analytic work on Daisyworld and are able to bring together and summarize these results from different systems for the first time. We conclude by suggesting what a more general model of life-environment interaction should be based on
Spectral Evolution of an Earth-Like Planet
We have developed a characterization of the geological evolution of the
Earths atmosphere and surface in order to model the observable spectra of an
Earth-like planet through its geological history. These calculations are
designed to guide the interpretation of an observed spectrum of such a planet
by future instruments that will characterize exoplanets. Our models focus on
spectral features that either imply habitability or are required for
habitability. These features are generated by H2O, CO2, CH4, O2, O3, N2O, and
vegetation-like surface albedos. We chose six geological epochs to
characterize. These epochs exhibit a wide range in abundance for these
molecules, ranging from a CO2 rich early atmosphere, to a CO2/CH4-rich
atmosphere around 2 billion years ago to a present-day atmosphere. We analyzed
the spectra to quantify the strength of each important spectral feature in both
the visible and thermal infrared spectral regions, and the resolutions required
to unambiguously observe the features for each epoch. We find a wide range of
spectral resolutions required for observing the different features. For
example, H2O and O3 can be observed with relatively low resolution, while O2
and N2O require higher resolution. We also find that the inclusion of clouds in
our models significantly affects both the strengths and resolutions required to
observe all spectral features.Comment: 34 pages, 24 fig, pdf, ApJ, TB
Positioning the Destination Product-Can Regional Tourist Boards Learn from Private Sector Practice?
This article examines the role of positioning in the
marketing of a tourism destination. The study focuses on the current positioning strategies pursued by the Regional Tourist Boards (RTBs) in England. A recent nationwide consumer research study into short holiday destination choice in the UK revealed that consumers were confused by the regional product message. The evidence suggests that current RTB positioning strategies are failing to keep pace with the constantly evolving needs of the consumer. This
article explores the reasons for clearly positioning the destination product and suggests that, although RTBs could learn from marketing strategies employed in other sectors of the tourism industry, there are likely to be organisational and cultural barriers inhibiting this
learning curve
Charged gravitational instantons in five-dimensional Einstein-Gauss-Bonnet-Maxwell theory
We study a solution of the Einstein-Gauus-Bonnet theory in 5 dimensions
coupled to a Maxwell field, whose euclidean continuation gives rise to an
instanton describing black hole pair production. We also discuss the dual
theory with a 3-form field coupled to gravity.Comment: 8 pages, plain Te
Even-dimensional topological gravity from Chern-Simons gravity
It is shown that the topological action for gravity in 2n-dimensions can be
obtained from the 2n+1-dimensional Chern-Simons gravity genuinely invariant
under the Poincare group. The 2n-dimensional topological gravity is described
by the dynamics of the boundary of a 2n+1-dimensional Chern-Simons gravity
theory with suitable boundary conditions. The field , which is
necessary to construct this type of topological gravity in even dimensions, is
identified with the coset field associated with the non-linear realizations of
the Poincare group ISO(d-1,1)
Gravitational dynamics for all tensorial spacetimes carrying predictive, interpretable and quantizable matter
Only a severely restricted class of tensor fields can provide classical
spacetime geometries, namely those that can carry matter field equations that
are predictive, interpretable and quantizable. These three conditions on matter
translate into three corresponding algebraic conditions on the underlying
tensorial geometry, namely to be hyperbolic, time-orientable and
energy-distinguishing. Lorentzian metrics, on which general relativity and the
standard model of particle physics are built, present just the simplest
tensorial spacetime geometry satisfying these conditions. The problem of
finding gravitational dynamics---for the general tensorial spacetime geometries
satisfying the above minimum requirements---is reformulated in this paper as a
system of linear partial differential equations, in the sense that their
solutions yield the actions governing the corresponding spacetime geometry.
Thus the search for modified gravitational dynamics is reduced to a clear
mathematical task.Comment: 47 pages, no figures, minor update
Higher dimensional gravity invariant under the Poincare group
It is shown that the Stelle-West Grignani-Nardelli-formalism allows, both
when odd dimensions and when even dimensions are considered, constructing
actions for higher dimensional gravity invariant under local Lorentz rotations
and under local Poincar\`{e} translations. It is also proved that such actions
have the same coefficients as those obtained by Troncoso and Zanelli in ref.
Class. Quantum Grav. 17 (2000) 4451.Comment: 7 pages, Latex, accepted in Phys. Rev.
Legal frameworks for unique ecosystems – how can the EPBC Act offsets policy address the impact of development on seagrass?
Environmental or biodiversity offset policies allow for impacts occurring at one site to be offset through activities at another site. The federal government has recently released a policy for offsetting the impacts of activities approved under the Environment Protection and Biodiversity Conservation Act 1999 (Cth) (EPBC Act). The EPBC Act policy can be used to offset impacts on terrestrial and marine ecosystems, and one of the first applications of the policy has been to offset impacts on seagrass meadows at risk due to the Abbot Point coal terminal expansion. The significant ecological differences between terrestrial and marine ecosystems, such as seagrass meadows, require different management approaches to ensure that impacts are offset. This article analyses the EPBC Act policy to determine whether it adequately caters for offsetting impacts on marine ecosystems, with seagrass used as an example. It concludes with recommendations for policy change directed at ensuring that the unique characteristics of seagrass ecosystems are considered in offset policies
From darkness to light: children speak of divine encounter
Studies have shown that children share both positive and dark spiritual experiences. The former dominates the literature but whilst the need to address the dark side of spirituality has been raised it has not, as yet, been dealt with as widely as the more positive aspects (de Souza 2012). This paper draws on an empirical study with 44 children aged 8-11 who were interviewed in school after visiting a sacred space. Three key themes arising from their conversations are covered in this paper: divine encounter; physical feelings and fear. It is argued that the most appropriate way of understanding these phenomena is to draw on different fields and disciplines, notably although not exclusively theology, psychoanalysis, psychology and neuroscience are considered. The paper concludes that it is important to recognise both the light and dark and the blurred boundaries between them, in addition to different ways of perceiving them, in order to understand the whole child
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