Effects on the CMB from Compactification Before Inflation

Eleni-Alexandra Kontou, Jose J. Blanco-Pillado, Mark P. Hertzberg, Ali Masoumi

Research output: Contribution to journalArticlepeer-review


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.
Original languageEnglish
Number of pages16
JournalJournal of Cosmology and Astroparticle Physics
Publication statusPublished - 20 Apr 2017

Bibliographical note

21 pages, 5 Figures (references added)
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  • hep-th
  • astro-ph.CO
  • gr-qc
  • hep-ph

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