Model independent constraints on the cosmological expansion rate (2008)
Mortsell, Edvard, Clarkson, Chris
We investigate what current cosmological data tells us about the cosmological expansion rate in a model independent way. Specifically, we study if the expansion was decelerating at high redshifts and...
A litmus test for Lambda (2008)
Zunckel, Caroline, Clarkson, Chris
The critical issue in cosmology today lies in determining if the cosmological constant is the underlying ingredient of dark energy. Our profound lack of understanding of the physics of dark energy...
Non-parametric Dark Energy Degeneracies (2008)
Hlozek, Renée, Cortês, Marina, Clarkson, Chris, Bassett, Bruce
We study the degeneracies between dark energy dynamics, dark matter and curvature using a non-parametric and non-perturbative approach. This allows us to examine the knock-on bias induced in the...
Time drift of cosmological redshifts as a test of the Copernican principle (2007)
Uzan, Jean-Philippe, Clarkson, Chris, Ellis, George F. R.
We present the time drift of the cosmological redshift in a general spherically symmetric spacetime. We demonstrate that its observation would allow us to test the Copernican principle and so...
A general test of the Copernican Principle (2007)
Clarkson, Chris, Bassett, Bruce A., Lu, Teresa Hui-Ching
The recent discovery of apparent cosmic acceleration has highlighted the depth of our ignorance of the fundamental properties of nature. It is commonly assumed that the explanation for acceleration...
Vector modes generated by primordial density fluctuations (2007)
Lu, Teresa Hui-Ching, Ananda, Kishore, Clarkson, Chris
While vector modes are usually ignored in cosmology since they are not produced during inflation they are inevitably produced from the interaction of density fluctuations of differing wavelengths....
A covariant approach for perturbations of rotationally symmetric spacetimes (2007)
We present a covariant decomposition of Einstein's Field Equations which is particularly suitable for perturbations of spherically symmetric -- and general locally rotationally symmetric --...
Dynamical Dark Energy or Simply Cosmic Curvature? (2007)
Clarkson, Chris, Cortes, Marina, Bassett, Bruce A.
We show that the assumption of a flat universe induces critically large errors in reconstructing the dark energy equation of state at z>~0.9 even if the true cosmic curvature is very small, O(1%) or...
Acknowledgements for 'Lithics in the Land of the Lightning Brothers'
Defining Research Questions in Northern Australian Lithic Studies (2007)
Chapter 1 of 'Lithics in the Land of the Lightning Brothers'
Modelling Optimality in Subsistence and Technology (2007)
Chapter 2 of 'Lithics in the Land of the Lightning Brothers'
Procedures for Lithic Analysis (2007)
Chapter 3 of 'Lithics in the Land of the Lightning Brothers'
Wardaman Country: Physiography and Climate Change (2007)
Chapter 4 of 'Lithics in the Land of the Lightning Brothers'
The Sites: Nimji, Garnawala 2, Gordolya and Jagoliya (2007)
Chapter 5 of 'Lithics in the Land of the Lightning Brothers'
Reduction Sequences: Artefact Form and Manufacturing Technology in Wardaman Country (2007)
Chapter 6 of 'Lithics in the Land of the Lightning Brothers'
Change and Continuity in Stone Artefact Manufacture (2007)
Chapter 7 of 'Lithics in the Land of the Lightning Brothers'
Wardaman Country in Broader Context: A New Look at North Australian Prehistory (2007)
Chapter 8 of 'Lithics in the Land of the Lightning Brothers'
Appendix A. Attributes recorded on stone artefacts (2007)
Appendix A of 'Lithics in the Land of the Lightning Brothers'
Appendix B. Descriptions of excavated materials from Nimji (2007)
Appendix B of 'Lithics in the Land of the Lightning Brothers'
Appendix C. Descriptions of excavated materials from Garnawala 2 (2007)
Appendix C of 'Lithics in the Land of the Lightning Brothers'
Appendix D. Descriptions of excavated materials from Jagoliya (2007)
Appendix D of 'Lithics in the Land of the Lightning Brothers'
Appendix E. Descriptions of excavated materials from Gordolya (2007)
Appendix E of 'Lithics in the Land of the Lightning Brothers'
Gravitational waves generated by second order effects during inflation (2006)
Osano, Bob, Pitrou, Cyril, Dunsby, Peter, Uzan, Jean-Philippe, Clarkson, Chris
The generation of gravitational waves during inflation due to the non-linear coupling of scalar and tensor modes is discussed. Two methods describing gravitational wave perturbations are used and...
The cosmological gravitational wave background from primordial density perturbations (2006)
Ananda, Kishore N., Clarkson, Chris, Wands, David
We discuss the gravitational wave background generated by primordial density perturbations evolving during the radiation era. At second-order in a perturbative expansion, density fluctuations produce...
A gravitational wave window on extra dimensions (2006)
Clarkson, Chris, Seahra, Sanjeev S.
We report on the possibility of detecting a submillimetre-sized extra dimension by observing gravitational waves (GWs) emitted by pointlike objects orbiting a braneworld black hole. Matter in the...
Photon gas dynamics in the early universe (2006)
Clarkson, Chris, Marklund, Mattias
Quantum electrodynamics predicts that photons undergo one-loop scattering. The combined effect of this on the behaviour of a photon gas for temperatures above 10^{10} K results in a softening of the...
Comment on "Reassessing Australia's linguistic prehistory" by Mark Clendon (2006)
Since Clendon has mainly addressed the linguistic data, I will restrict my comments to the archaeological and other kinds of evidence for Late Pleistocene social and demographic changes of relevance...
Quantifying Flake Scar Patterning on Cores Using 3D Recording Techniques (2006)
Clarkson, Chris, Vinicius, Lucio, Lahr, Marta
A key feature of stone artefact morphology is the arrangement and patterning of negative flake scars left on flakes and cores. Scar patterning is often treated as a rough guide to identifying methods...
Langley, Michelle C., Ulm, Sean, Clarkson, Chris
Diachronic approaches provide potential for a more sophisticated framework within which to examine change in Neanderthal behavioural complexity using archaeological proxies such as symbolic...
Quantifying Flake Scar Patterning on Cores Using 3D Recording Techniques (2006)
Clarkson, Chris, Vinicius, Lucio, Lahr, Marta
A key feature of stone artefact morphology is the arrangement and patterning of negative flake scars left on flakes and cores. Scar patterning is often treated as a rough guide to identifying methods...
Comment on "Reassessing Australia's linguistic prehistory" by Mark Clendon (2006)
Since Clendon has mainly addressed the linguistic data, I will restrict my comments to the archaeological and other kinds of evidence for Late Pleistocene social and demographic changes of relevance...
Comment on "Reassessing Australia's linguistic prehistory" by Mark Clendon (2006)
Since Clendon has mainly addressed the linguistic data, I will restrict my comments to the archaeological and other kinds of evidence for Late Pleistocene social and demographic changes of relevance...
Quantifying Flake Scar Patterning on Cores Using 3D Recording Techniques (2006)
Clarkson, Chris, Vinicius, Lucio, Lahr, Marta
A key feature of stone artefact morphology is the arrangement and patterning of negative flake scars left on flakes and cores. Scar patterning is often treated as a rough guide to identifying methods...
Langley, Michelle C., Ulm, Sean, Clarkson, Chris
Diachronic approaches provide potential for a more sophisticated framework within which to examine change in Neanderthal behavioural complexity using archaeological proxies such as symbolic...
Clarkson, Chris, Seahra, Sanjeev S.
We investigate in detail gravitational waves in an Schwarzschild-anti-de Sitter bulk spacetime surrounded by an Einstein static brane with generic matter content. Such a model provides a useful...
Gravity-wave detectors as probes of extra dimensions (2005)
Clarkson, Chris, Maartens, Roy
If string theory is correct, then our observable Universe may be a 3-dimensional "brane" embedded in a higher-dimensional spacetime. This theoretical scenario should be tested via the...
Delocalization of brane gravity by a bulk black hole (2005)
Seahra, Sanjeev S., Clarkson, Chris, Maartens, Roy
We investigate the analogue of the Randall-Sundrum brane-world in the case when the bulk contains a black hole. Instead of the static vacuum Minkowski brane of the RS model, we have an Einstein...
Measuring artefact reduction: an examination of Kuhn's Geometric Index of Reduction (2005)
Hiscock, Peter, Clarkson, Chris
A growing number of techniques have been proposed in recent years to quantify how much retouch has been applied to flakes. This paper reviews the most prominent of these, and evaluates one in...
To better understand the relationship between changing retouched implement morphology and intensity of reduction, archaeologists must develop measures of morphological change that work outside of,...
Measuring Artefact Reduction: An evaluation of Kuhn's Geometric Index of Unifacial Reduction (2005)
Hiscock, Peter, Clarkson, Chris
A growing number of techniques have been proposed in recent years to quantify how much retouch has been applied to flakes. This paper reviews the most prominent of these, and evaluates one in...
Experimental Evaluation of Kuhn's Geometric Index of Reduction and the Flat-Flake Problem (2005)
Hiscock, Peter, Clarkson, Chris
This paper presents the results of an experiment designed to explore the performance of Kuhn's Geometric Index of Unifacial Reduction [S. Kuhn, A geometric index of reduction for unifacial stone...
Introduction: Casting New Light on Old Stones (2005)
The purpose of this monograph is to take a new look at various aspects of stone artefact analysis that reveal important and exciting new information about the past. This invovles reorienting our...
Introduction: Casting New Light on Old Stones (2005)
Clarkson, Chris, Lamb, Lara, Clarkson, Chris, Lamb, Lara
The purpose of this monograph is to take a new look at various aspects of stone artefact analysis that reveal important and exciting new information about the past. This invovles reorienting our...
Experimental Evaluation of Kuhn's Geometric Index of Reduction and the Flat-Flake Problem (2005)
Hiscock, Peter, Clarkson, Chris
This paper presents the results of an experiment designed to explore the performance of Kuhn's Geometric Index of Unifacial Reduction [S. Kuhn, A geometric index of reduction for unifacial stone...
Measuring Artefact Reduction: An evaluation of Kuhn's Geometric Index of Unifacial Reduction (2005)
Hiscock, Peter, Clarkson, Chris, Clarkson, Chris, Lamb, Lara
A growing number of techniques have been proposed in recent years to quantify how much retouch has been applied to flakes. This paper reviews the most prominent of these, and evaluates one in...
Clarkson, Chris, Clarkson, Chris, Lamb, Lara
To better understand the relationship between changing retouched implement morphology and intensity of reduction, archaeologists must develop measures of morphological change that work outside of,...
Measuring artefact reduction: an examination of Kuhn's Geometric Index of Reduction (2005)
Hiscock, Peter, Clarkson, Chris
A growing number of techniques have been proposed in recent years to quantify how much retouch has been applied to flakes. This paper reviews the most prominent of these, and evaluates one in...
Measuring artefact reduction: an examination of Kuhn's Geometric Index of Reduction (2005)
Hiscock, Peter, Clarkson, Chris, Clarkson, C., Lamb, L.
A growing number of techniques have been proposed in recent years to quantify how much retouch has been applied to flakes. This paper reviews the most prominent of these, and evaluates one in...
Measuring artefact reduction: an examination of Kuhn's Geometric Index of Reduction (2005)
Hiscock, Peter, Clarkson, Chris
A growing number of techniques have been proposed in recent years to quantify how much retouch has been applied to flakes. This paper reviews the most prominent of these, and evaluates one in...
To better understand the relationship between changing retouched implement morphology and intensity of reduction, archaeologists must develop measures of morphological change that work outside of,...
Measuring Artefact Reduction: An evaluation of Kuhn's Geometric Index of Unifacial Reduction (2005)
Hiscock, Peter, Clarkson, Chris
A growing number of techniques have been proposed in recent years to quantify how much retouch has been applied to flakes. This paper reviews the most prominent of these, and evaluates one in...
Experimental Evaluation of Kuhn's Geometric Index of Reduction and the Flat-Flake Problem (2005)
Hiscock, Peter, Clarkson, Chris
This paper presents the results of an experiment designed to explore the performance of Kuhn's Geometric Index of Unifacial Reduction [S. Kuhn, A geometric index of reduction for unifacial stone...
Introduction: Casting New Light on Old Stones (2005)
The purpose of this monograph is to take a new look at various aspects of stone artefact analysis that reveal important and exciting new information about the past. This invovles reorienting our...
The general relativistic MHD dynamo equation (2004)
Marklund, Mattias, Clarkson, Chris
The magnetohydrodynamic dynamo equation is derived within general relativity, using the covariant 1+3 approach, for a plasma with finite electric conductivity. This formalism allows for a clear...
Detecting extra dimensions with gravity wave spectroscopy: the black string brane-world (2004)
Seahra, Sanjeev S., Clarkson, Chris, Maartens, Roy
Using the black string between two branes as a model of a brane-world black hole, we compute the gravity wave perturbations and identify the features arising from the additional polarizations of the...
We present a new approach to gauge-invariant cosmological perturbations at second order, which is also covariant. We examine two cases in particular for a dust Friedman-Lemaitre-Robertson-Walker...
This paper provides a generic measure of retouching for all chipped stone artefacts. A fast and reliable index is proposed which measures retouch in terms of the invasiveness of flake scars on the...
This paper proposes a reduction sequence for scrapers found at Ingaladdi rockshelter, Northern Territory. The sequence is based on the proposal that distinctive types represent stages in a continuum...
This paper proposes a reduction sequence for scrapers found at Ingaladdi rockshelter, Northern Territory. The sequence is based on the proposal that distinctive types represent stages in a continuum...
This paper provides a generic measure of retouching for all chipped stone artefacts. A fast and reliable index is proposed which measures retouch in terms of the invasiveness of flake scars on the...
This paper provides a generic measure of retouching for all chipped stone artefacts. A fast and reliable index is proposed which measures retouch in terms of the invasiveness of flake scars on the...
This paper proposes a reduction sequence for scrapers found at Ingaladdi rockshelter, Northern Territory. The sequence is based on the proposal that distinctive types represent stages in a continuum...
Technological Change in Wardaman Country: Report on the 1999 Season (2001)
In this paper I report on the aims, field procedures and preliminary results of four months of archaeological fieldwork conducted in 1999 in Wardaman Country in the Northern Territory. The study...
Technological Change in Wardaman Country: Report on the 1999 Season (2001)
In this paper I report on the aims, field procedures and preliminary results of four months of archaeological fieldwork conducted in 1999 in Wardaman Country in the Northern Territory. The study...
Analysing Australian stone artefacts: An agenda for the twenty first century (2000)
Hiscock, Peter, Clarkson, Chris
Not available
Analysing Australian Stone Artefacts: an Agenda for the Twenty-First Century (2000)
Hiscock, Peter, Clarkson, Chris
Over the last twenty five years we have had repeated evaluations of the history of stone artefact analysis in Australia (e.g. Mulvaney 1977; Hiscock 1983, 1998; Fullagar 1994; Holdaway 1995). Each of...
Analysing Australian stone artefacts: An agenda for the twenty first century (2000)
Hiscock, Peter, Clarkson, Chris
Not available
Analysing Australian stone artefacts: An agenda for the twenty first century (2000)
Hiscock, Peter, Clarkson, Chris
Not available
Analysing Australian stone artefacts: An agenda for the twenty first century (2000)
Hiscock, Peter, Clarkson, Chris
Not available
Analysing Australian Stone Artefacts: an Agenda for the Twenty-First Century (2000)
Hiscock, Peter, Clarkson, Chris
Over the last twenty five years we have had repeated evaluations of the history of stone artefact analysis in Australia (e.g. Mulvaney 1977; Hiscock 1983, 1998; Fullagar 1994; Holdaway 1995). Each of...
Does the Isotropy of the CMB Imply a Homogeneous Universe? Some Generalised EGS Theorems (1999)
Clarkson, Chris, Barrett, Richard
We demonstrate that the high isotropy of the Cosmic Microwave Background (CMB), combined with the Copernican principle, is not sufficient to prove homogeneity of the universe -- in contrast to...
Roof Fall Cave, Cania Gorge: Site Report (1999)
Eales, Tony, Westcott, Catherine, Lilley, Ian, Ulm, Sean, Brian, Deborah, Clarkson, Chris
This site report presents a description of archaeological investigations undertaken at Roof Fall Cave, an occupied rockshelter and art site located at Cania Gorge, eastern Central Queensland. Field...
Big Foot Art Site, Cania Gorge: Site Report (1999)
Westcott, Catherine, Lilley, Ian, Ulm, Sean, Clarkson, Chris, Brian, Deborah
This site report presents a description of archaeological investigations undertaken at Big Foot Art Site, a large rockshelter and art site located at Cania Gorge, eastern Central Queensland. Field...
Roof Fall Cave, Cania Gorge: Site Report
Eales, Tony, Westcott, Catherine, Lilley, Ian, Ulm, Sean, Brian, Deborah, Clarkson, Chris, ...
This site report presents a description of archaeological investigations undertaken at Roof Fall Cave, an occupied rockshelter and art site located at Cania Gorge, eastern Central Queensland. Field...
Big Foot Art Site, Cania Gorge: Site Report
Westcott, Catherine, Lilley, Ian, Ulm, Sean, Clarkson, Chris, Brian, Deborah, Lilley, Ian, ...
This site report presents a description of archaeological investigations undertaken at Big Foot Art Site, a large rockshelter and art site located at Cania Gorge, eastern Central Queensland. Field...
Technological Change in Wardaman Country: Report on the 1999 Season
In this paper I report on the aims, field procedures and preliminary results of four months of archaeological fieldwork conducted in 1999 in Wardaman Country in the Northern Territory. The study...
Analysing Australian Stone Artefacts: an Agenda for the Twenty-First Century
Hiscock, Peter, Clarkson, Chris
Over the last twenty five years we have had repeated evaluations of the history of stone artefact analysis in Australia (e.g. Mulvaney 1977; Hiscock 1983, 1998; Fullagar 1994; Holdaway 1995). Each of...