Effects on the CMB from Compactification Before Inflation

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JournalJournal of Cosmology and Astroparticle Physics
DateAccepted/In press - 5 Apr 2017
DatePublished (current) - 20 Apr 2017
Volume2017
Number of pages16
Original languageEnglish

Abstract

Many theories beyond the Standard Model include extra dimensions, though these have yet to be directly observed. In this work we consider the possibility of a compactification mechanism which both allows extra dimensions and is compatible with current observations. This compactification is predicted to leave a signature on the CMB by altering the amplitude of the low l multipoles, dependent on the amount of inflation. Recently discovered CMB anomalies at low multipoles may be evidence for this. In our model we assume the spacetime is the product of a four-dimensional spacetime and flat extra dimensions. Before the compactification, both the four-dimensional space- time and the extra dimensions can either be expanding or contracting independently. Taking into account physical constraints, we explore the observational consequences and the plausibility of these different models.

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21 pages, 5 Figures (references added)
© 2017 IOP Publishing Ltd and Sissa Medialab srl. This is an author-produced version of the published paper. Uploaded in accordance with the publisher’s self-archiving policy. Further copying may not be permitted; contact the publisher for details

    Research areas

  • hep-th, astro-ph.CO, gr-qc, hep-ph

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