Publications
212 results found
Sandvik HB, Barrow JD, Magueijo J, 2002, A simple cosmology with a varying fine structure constant, PHYSICAL REVIEW LETTERS, Vol: 88, ISSN: 0031-9007
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- Citations: 243
Magueijo J, 2002, Cosmological inflation and large-scale structure by A. Liddle and D. Lyth (Book review), General Relativity and Gravitation, ISSN: 0001-7701
Bean R, Magueijo J, 2001, Dilaton-derived quintessence scenario leading naturally to the late-time acceleration of the Universe, PHYSICS LETTERS B, Vol: 517, Pages: 177-183, ISSN: 0370-2693
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- Citations: 72
Rocha G, Magueijo J, Hobson M, et al., 2001, Bayesian joint estimation of non-Gaussianity and the power spectrum, PHYSICAL REVIEW D, Vol: 64, ISSN: 2470-0010
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- Citations: 18
Sandvik HB, Magueijo J, 2001, The complete bispectrum of <i>COBE</i>-DMR four-year maps, MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, Vol: 325, Pages: 463-467, ISSN: 0035-8711
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- Citations: 14
Magueijo J, Sandvik H, Kibble TWB, 2001, Nielsen-Olesen vortex in varying-alpha theories, PHYS REV D, Vol: 64, ISSN: 1550-7998
We consider soliton solutions to Bekenstein's theory, for which the fine structure constant alpha = e(2)/(4 pi(h) over barc) is allowed to vary due to the presence of a dielectric field pervading the vacuum. More specifically we investigate the effects of a varying alpha upon a complex scalar field with a U(1) electromagnetic gauge symmetry subject to spontaneous symmetry breaking. We find vortex solutions to this theory, similar to the Nielsen-Olesen vortex. Near the vortex core the electric charge is typically much larger than far away from the string, lending these strings a superconducting flavor. In general the dielectric field coats the usual local string with a global string envelope. We discuss the cosmological implications of networks of such strings, with particular emphasis on their ability to generate inhomogeneous recombination scenarios. We also consider the possibility of the dielectric being a charged free field. Even though the vacuum of such a field is trivial, we find that the dielectric arranges itself in the shape of a local string, with a quantized magnetic flux at the core-presumably borrowing these topological features from the underlying Nielsen-Olesen vortex.
Contaldi CR, Magueijo J, 2001, Generating non-Gaussian maps with a given power spectrum and bispectrum, PHYSICAL REVIEW D, Vol: 63, ISSN: 0556-2821
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- Citations: 21
Magueijo J, 2001, Stars and black holes in varying speed of light theories, PHYSICAL REVIEW D, Vol: 63, ISSN: 1550-7998
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- Citations: 53
Magueijo J, 2001, Plan B for the cosmos, SCIENTIFIC AMERICAN, Vol: 284, Pages: 58-59, ISSN: 0036-8733
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- Citations: 1
Magueijo J, Baskerville K, 2001, Derangements of the Big Bang and their revelations, Vision of the future: astronomy and earth science, Editors: Thompson, Cambridge, Publisher: Cambridge University Press, ISBN: 9780521805377
Magueijo J, 2001, Nothing really matters, a review of "The book of nothing" by John Barrow (Book review), Physics World, ISSN: 0953-8585
Contaldi CR, Hindmarsh M, Magueijo J, 2000, CMB and LSS Power spectra from local cosmic string seeded structure formation, Astrophysical Letters and Communications, Vol: 37, Pages: 415-420, ISSN: 0888-6512
We evaluate the two point functions of the stress energy from the largest string simulations carried out so far. The two point functions are used to calculate the cosmic microwave background (CMB) and cold dark matter (CDM) power spectra from local cosmic string models for structure formation. We find that our spectra differ significantly from those previously calculated for both global and local defects. We find a higher Doppler peak at l = 400 - 600 and a less severe bias problem than for global defects. Spectra were obtained for a variety of network energy-decay mechanisms. © 2000 OPA (Overseas Publishers Association).
Magueijo J, 2000, Covariant and locally Lorentz-invariant varying speed of light theories, PHYSICAL REVIEW D, Vol: 62, ISSN: 1550-7998
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- Citations: 108
Barrow JD, Bean R, Magueijo J, 2000, Can the Universe escape eternal acceleration?, MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, Vol: 316, Pages: L41-L44, ISSN: 0035-8711
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- Citations: 53
Contaldi CR, Ferreira PG, Magueijo J, et al., 2000, A Bayesian estimate of the skewness of the cosmic microwave background, ASTROPHYSICAL JOURNAL, Vol: 534, Pages: 25-28, ISSN: 0004-637X
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- Citations: 24
Magueijo J, 2000, New non-Gaussian feature in <i>COBE</i>-DMR 4 year maps (vol 528, pg L57, 2000), ASTROPHYSICAL JOURNAL, Vol: 532, Pages: L157-L157, ISSN: 0004-637X
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- Citations: 4
Barrow JD, Magueijo J, 2000, Can a changing α explain the supernovae results?, ASTROPHYSICAL JOURNAL, Vol: 532, Pages: L87-L90, ISSN: 0004-637X
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- Citations: 43
Copeland EJ, Magueijo J, Steer DA, 2000, Cosmological parameter dependence in local string theories of structure formation, PHYSICAL REVIEW D, Vol: 61, ISSN: 1550-7998
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- Citations: 13
Magueijo J, 2000, New non-Gaussian feature in <i>COBE</i>-DMR 4 year maps, ASTROPHYSICAL JOURNAL, Vol: 528, Pages: L57-L60, ISSN: 0004-637X
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- Citations: 53
Magueijo J, Ferreira PG, Górski KM, 2000, Evidence for non-Gaussianity in the CMB, Workshop on Cosmic Microwave Background and the Planck Mission, Publisher: GORDON BREACH PUBLISHING, TAYLOR & FRANCIS GROUP, Pages: 395-402, ISSN: 0888-6512
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- Citations: 2
Contaldi CR, Hindmarsh M, Magueijo J, 2000, CMB and LSS power spectra from local cosmic string seeded structure formation, Workshop on Cosmic Microwave Background and the Planck Mission, Publisher: GORDON BREACH SCI PUBL LTD, Pages: 415-420, ISSN: 0888-6512
Magueijo J, Baskerville K, 1999, Big Bang riddles and their revelations, PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES, Vol: 357, Pages: 3221-3236, ISSN: 1364-503X
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- Citations: 2
Contaldi CR, Bean R, Magueijo J, 1999, Photographing the wave function of the Universe, PHYSICS LETTERS B, Vol: 468, Pages: 189-194, ISSN: 0370-2693
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- Citations: 27
Magueijo J, Sandvik H, Steer DA, 1999, Statistical physics of cosmological networks of string loops, PHYSICAL REVIEW D, Vol: 60, ISSN: 0556-2821
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- Citations: 7
Barrow JD, Magueijo J, 1999, Solving the flatness and quasi-flatness problems in Brans-Dicke cosmologies with a varying light speed, CLASSICAL AND QUANTUM GRAVITY, Vol: 16, Pages: 1435-1454, ISSN: 0264-9381
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- Citations: 81
Contaldi C, Hindmarsh H, Magueijo J, 1999, Cosmic microwave background and density fluctuations from strings plus inflation, PHYSICAL REVIEW LETTERS, Vol: 82, Pages: 2034-2037, ISSN: 0031-9007
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- Citations: 73
Albrecht A, Magueijo J, 1999, Time varying speed of light as a solution to cosmological puzzles, PHYSICAL REVIEW D, Vol: 59, ISSN: 1550-7998
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- Citations: 358
Barrow JD, Magueijo J, 1999, Solutions to the quasi-flatness and quasi-lambda problems, PHYSICS LETTERS B, Vol: 447, Pages: 246-250, ISSN: 0370-2693
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- Citations: 97
Contaldi C, Hindmarsh M, Magueijo J, 1999, Power spectra of the cosmic microwave background and density fluctuations seeded by local cosmic strings, PHYSICAL REVIEW LETTERS, Vol: 82, Pages: 679-682, ISSN: 0031-9007
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- Citations: 82
Magueijo J, Ferreira PG, Górski KM, 1999, Where is COBE maps' non-Gaussianity?, 2nd International Workshop on Particle Physics and the Early Universe, Publisher: AMER INST PHYSICS, Pages: 176-179, ISSN: 0094-243X
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- Citations: 1
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