ORCID Profile
0000-0002-1556-9449
Current Organisation
University of Cambridge
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Astronomy And Astrophysics | Astronomical and Space Sciences | Atomic And Molecular Physics
Publisher: AIP
Date: 2008
DOI: 10.1063/1.2916973
Publisher: Elsevier BV
Date: 05-2003
Publisher: Oxford University Press (OUP)
Date: 07-2000
Publisher: Oxford University Press (OUP)
Date: 03-2010
Publisher: Springer Netherlands
Date: 2001
Publisher: Oxford University Press (OUP)
Date: 11-05-2004
Publisher: Cambridge University Press (CUP)
Date: 2016
DOI: 10.1017/PASA.2016.30
Abstract: Making use of a new N -body model to describe the evolution of a moderate-size globular cluster, we investigate the characteristics of the population of black holes within such a cluster. This model reaches core-collapse and achieves a peak central density typical of the dense globular clusters of the Milky Way. Within this high-density environment, we see direct confirmation of the merging of two stellar remnant black holes in a dynamically formed binary, a gravitational wave source. We describe how the formation, evolution, and ultimate ejection/destruction of binary systems containing black holes impacts the evolution of the cluster core. Also, through comparison with previous models of lower density, we show that the period distribution of black hole binaries formed through dynamical interactions in this high-density model favours the production of gravitational wave sources. We confirm that the number of black holes remaining in a star cluster at late times and the characteristics of the binary black hole population depend on the nature of the star cluster, critically on the number density of stars and by extension the relaxation timescale.
Publisher: Oxford University Press (OUP)
Date: 10-09-2014
Publisher: Oxford University Press (OUP)
Date: 11-08-2003
Publisher: Elsevier BV
Date: 07-2005
Publisher: American Astronomical Society
Date: 08-2019
Publisher: Oxford University Press (OUP)
Date: 08-1998
Publisher: IOP Publishing
Date: 06-2009
Publisher: Cambridge University Press (CUP)
Date: 2009
DOI: 10.1071/AS08062
Abstract: An N -body code containing live stellar evolution through combination of the software packages nbody6 and stars is presented. Operational details of the two codes are outlined and the changes that have been made to combine them discussed. We have computed the evolution of clusters of 10 4 stars using the combined code and we compare the results with those obtained using nbody6 and the synthetic stellar evolution code sse . We find that, providing the physics package within stars is set up correctly to match the parameters of the models used to construct sse , the results are very similar. This provides a good indication that the new code is working well. We also demonstrate how this physics can be changed simply in the new code with convective overshooting as an ex le. Similar changes in sse would require considerable reworking of the model fits. We conclude by outlining proposed future development of the code to include more complete models of single stars and binary star systems.
Publisher: Cambridge University Press (CUP)
Date: 12-2007
DOI: 10.1017/S1743921308024010
Abstract: Division VIII gathers astronomers engaged in the study of the visible and invisible matter in the Universe at large, from Local Group galaxies via distant galaxies and galaxy clusters to the large-scale structure of the Universe and the cosmic background radiation.
Publisher: Oxford University Press (OUP)
Date: 11-1998
Publisher: Oxford University Press (OUP)
Date: 21-05-2001
Publisher: Oxford University Press (OUP)
Date: 12-2004
Publisher: Oxford University Press (OUP)
Date: 22-12-2019
Publisher: Oxford University Press (OUP)
Date: 02-2002
Publisher: EDP Sciences
Date: 2006
DOI: 10.1051/EAS:2006032
Publisher: Oxford University Press (OUP)
Date: 08-2000
Publisher: Oxford University Press (OUP)
Date: 19-07-2018
Publisher: Oxford University Press (OUP)
Date: 31-12-2014
Publisher: Elsevier BV
Date: 08-2018
DOI: 10.1016/J.PBIOMOLBIO.2018.03.004
Abstract: We review the salient evidence consistent with or predicted by the Hoyle-Wickramasinghe (H-W) thesis of Cometary (Cosmic) Biology. Much of this physical and biological evidence is multifactorial. One particular focus are the recent studies which date the emergence of the complex retroviruses of vertebrate lines at or just before the Cambrian Explosion of ∼500 Ma. Such viruses are known to be plausibly associated with major evolutionary genomic processes. We believe this coincidence is not fortuitous but is consistent with a key prediction of H-W theory whereby major extinction- ersification evolutionary boundaries coincide with virus-bearing cometary-bolide bombardment events. A second focus is the remarkable evolution of intelligent complexity (Cephalopods) culminating in the emergence of the Octopus. A third focus concerns the micro-organism fossil evidence contained within meteorites as well as the detection in the upper atmosphere of apparent incoming life-bearing particles from space. In our view the totality of the multifactorial data and critical analyses assembled by Fred Hoyle, Chandra Wickramasinghe and their many colleagues since the 1960s leads to a very plausible conclusion - life may have been seeded here on Earth by life-bearing comets as soon as conditions on Earth allowed it to flourish (about or just before 4.1 Billion years ago) and living organisms such as space-resistant and space-hardy bacteria, viruses, more complex eukaryotic cells, fertilised ova and seeds have been continuously delivered ever since to Earth so being one important driver of further terrestrial evolution which has resulted in considerable genetic ersity and which has led to the emergence of mankind.
Publisher: Oxford University Press (OUP)
Date: 02-2003
Publisher: Elsevier BV
Date: 2019
Publisher: Elsevier BV
Date: 08-2018
Publisher: Oxford University Press (OUP)
Date: 11-10-2005
Publisher: Oxford University Press (OUP)
Date: 17-07-2014
Publisher: AIP
Date: 2007
DOI: 10.1063/1.2818997
Location: United Kingdom of Great Britain and Northern Ireland
Start Date: 2003
End Date: 12-2005
Amount: $162,000.00
Funder: Australian Research Council
View Funded Activity