Imperial College London
Alternate

Prof Joao Magueijo

Faculty of Natural Sciences, Department of Physics

Professor of Physics
 
 
 
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Contact

 

j.magueijo Website

 
 
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Location

 

Huxley BuildingSouth Kensington Campus

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Summary

 

Publications

Publication Type
Year
to

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

Journal article

Magueijo J, 2002, Cosmological inflation and large-scale structure by A. Liddle and D. Lyth (Book review), General Relativity and Gravitation, ISSN: 0001-7701

Journal article

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

Journal article

Rocha G, Magueijo J, Hobson M, Lasenby Aet al., 2001, Bayesian joint estimation of non-Gaussianity and the power spectrum, PHYSICAL REVIEW D, Vol: 64, ISSN: 2470-0010

Journal article

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

Journal article

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.

Journal article

Contaldi CR, Magueijo J, 2001, Generating non-Gaussian maps with a given power spectrum and bispectrum, PHYSICAL REVIEW D, Vol: 63, ISSN: 0556-2821

Journal article

Magueijo J, 2001, Stars and black holes in varying speed of light theories, PHYSICAL REVIEW D, Vol: 63, ISSN: 1550-7998

Journal article

Magueijo J, 2001, Plan B for the cosmos, SCIENTIFIC AMERICAN, Vol: 284, Pages: 58-59, ISSN: 0036-8733

Journal article

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

Book chapter

Magueijo J, 2001, Nothing really matters, a review of "The book of nothing" by John Barrow (Book review), Physics World, ISSN: 0953-8585

Journal article

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).

Journal article

Magueijo J, 2000, Covariant and locally Lorentz-invariant varying speed of light theories, PHYSICAL REVIEW D, Vol: 62, ISSN: 1550-7998

Journal article

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

Journal article

Contaldi CR, Ferreira PG, Magueijo J, Górski KMet al., 2000, A Bayesian estimate of the skewness of the cosmic microwave background, ASTROPHYSICAL JOURNAL, Vol: 534, Pages: 25-28, ISSN: 0004-637X

Journal article

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

Journal article

Barrow JD, Magueijo J, 2000, Can a changing α explain the supernovae results?, ASTROPHYSICAL JOURNAL, Vol: 532, Pages: L87-L90, ISSN: 0004-637X

Journal article

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

Journal article

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

Journal article

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

Conference paper

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

Conference paper

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

Journal article

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

Journal article

Magueijo J, Sandvik H, Steer DA, 1999, Statistical physics of cosmological networks of string loops, PHYSICAL REVIEW D, Vol: 60, ISSN: 0556-2821

Journal article

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

Journal article

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

Journal article

Albrecht A, Magueijo J, 1999, Time varying speed of light as a solution to cosmological puzzles, PHYSICAL REVIEW D, Vol: 59, ISSN: 1550-7998

Journal article

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

Journal article

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

Journal article

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

Conference paper

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