Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/3202
Full metadata record
DC FieldValueLanguage
dc.contributor.authorPollock, M.D.-
dc.date.accessioned2007-06-30T10:53:13Z-
dc.date.available2007-06-30T10:53:13Z-
dc.date.issued1988-11-
dc.identifier.citationNuclear Physics B, 1988, Vol.309, p513-532en
dc.identifier.issn0550-3213-
dc.identifier.urihttp://hdl.handle.net/2289/3202-
dc.descriptionRestricted Access.en
dc.description.abstractWe consider super-exponential inflation in the early universe, for which Image, with particular reference to the higher-dimensional theory of Shafi and Wetterich, which is discussed in further detail. The Hubble parameter H is given by H2 ≈ (8π/3mp2)V(φ), where the ‘inflaton’ field φ is related to the radius of the internal space, and obeys the equation of motion Image. The spectrum of density perturbations is given by δvarrho/varrho = (M/M0)−s, where s−1 ≈ 3(q + 1); and X ≡ (−∂V/∂φ)/(∂W/∂φ). The parameters q and X are both positive constants, hence the need for two distinct potentials, which can be met in a higher-dimensional theory with higher-derivative terms Image. Some fine-tuning of the parameters Image and/or of the cosmological constant Image is always necessary in order to have super-exponential inflation. It is possible to obtain a spectrum of density perturbations with Image, which helps to give agreement with observations of the cosmic microwave background radiation at very large scales not, vert, similar 1000 Mpc. When Image is proportional to the Euler number density, making the four-dimensional theory free of ghosts, then super-exponential inflation is impossible, but a phase of inflation with Image can still occur.en
dc.format.extent773774 bytes-
dc.format.mimetypeapplication/pdf-
dc.language.isoenen
dc.publisherElsevier B.V.en
dc.relation.urihttp://dx.doi.org/10.1016/0550-3213(88)90456-7en
dc.rights1988 Elsevier B.V.en
dc.titleOn super-exponential inflation in a higher-dimensional theory of gravity with higher-derivative termsen
dc.typeArticleen
Appears in Collections:Research Papers (TP)

Files in This Item:
File Description SizeFormat 
1988 NP-B V309 p513.pdf
  Restricted Access
Restricted Access755.64 kBAdobe PDFView/Open Request a copy


Items in RRI Digital Repository are protected by copyright, with all rights reserved, unless otherwise indicated.