Brane new worlds
Article Abstract:
It has been suggested that the four-dimensional space-time we observe at everyday scales is the evolution in time of a three-brane moving through an ambient space-time of higher dimension. If the extra dimension were infinite, and if the embedding space-time has a very specific curvature, then it is possible for the predicted corrections to Newton's law to be in alignment with experimental results. This research has particularly significant implications for particle physics, as other connected ideas could offer a solution to the 'hierarchy problem,' one of the key issues in going beyond the Standard Model of particle physics.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2000
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Positronic lithium and the many-body problem
Article Abstract:
Research undertaken at the Northern Territory University, Australia, indicates that it should be possible to attach a positron to a neutral lithium atom. This would produce an exotic positive ion, and it could then be compared with the corresponding negative ion. It has been calculated that lithium, the lightest of the alkalis, can bind a positron, creating a stable positronic ion. It will be necessary to produce actual positronic lithium and measure its spectrum if an insight is to be gained into many-body interactions in this system.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1998
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Disappearing dimensions
Article Abstract:
Theories of particle physics propose the existence of extra-spatial dimensions. Two groups of physicists from Harvard and the Fermi National Accelerator Laboratory have suggested mechanisms for the appearance and disappearance of the dimensions of space.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2001
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