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Loop quantum cosmology and the fine structure constant

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Article number025014
<mark>Journal publication date</mark>2013
<mark>Journal</mark>Classical and Quantum Gravity
Issue number2
Number of pages13
Publication StatusPublished
<mark>Original language</mark>English


The cosmological implications of introducing a variation to the fine structure ‘constant’, α are examined within the context of loop quantum cosmology. The evolution of α is described using the model introduced by Bekenstein, Sandvik, Barrow and Magueijo, in which a ghost scalar field produces the variation. The dynamics of the system are examined in flat and closed cosmological settings. Matter consisting of the scalar field and radiation are examined with a thermodynamically motivated coupling between the two, which can lead to a series of bounces induced by both the negative density effects of the ghost field and the loop effects.