Coherent Scalar Field Oscillations and the Epoch of Deceleration

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dc.creatorJackson, J. C.
dc.date2001-11-19
dc.date.accessioned2026-07-07T02:01:25Z
dc.date.available2026-07-07T02:01:25Z
dc.descriptionThe discovery of supernova SN 1997ff at z~1.7 has confirmed the expected switch from cosmological acceleration to deceleration, as predicted by the concordance Lambda/CDM model. However, its position in the SN Ia Hubble diagram suggestes that the switch is too pronounced, which here is taken to mean that a cosmological constant is not an adequate description of the state of the vacuum. An 'oscillessence' model is invoked, with a scalar field phi governed by a simple quadratic potential, which gives a better fit to the new data point. The field is undergoing coherent oscillations, and a key feature of the proposal is that we are towards the end of the second period of acceleration; a Lambda/phi mix replaces Lambda/CDM, with Omega_Lambda~0.4 and Omega_phi~0.6.
dc.description6 pages, 4 Figures. Submitted to MNRAS
dc.identifierhttps://arxiv.org/abs/astro-ph/0111360
dc.identifierhttp://arxiv.org/abs/astro-ph/0111360
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/3741
dc.subjectAstrophysics
dc.subjectGeneral Relativity and Quantum Cosmology
dc.subjectHigh Energy Physics - Phenomenology
dc.subjectHigh Energy Physics - Theory
dc.titleCoherent Scalar Field Oscillations and the Epoch of Deceleration
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