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.
| Original language | English |
|---|---|
| Number of pages | 16 |
| Journal | Journal of Cosmology and Astroparticle Physics |
| Volume | 2017 |
| DOIs | |
| Publication status | Published - 20 Apr 2017 |
Bibliographical note
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
Keywords
- hep-th
- astro-ph.CO
- gr-qc
- hep-ph