Standard Clock in Primordial Density Perturbations and Cosmic Microwave Background

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Standard Clock in Primordial Density Perturbations and Cosmic Microwave Background

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Title: Standard Clock in Primordial Density Perturbations and Cosmic Microwave Background
Author(s):
Chen, Xingang;
Namjoo, Mohammad Hossein
Item Type: Article
Keywords: Standard clock
Planck data
Primordial universe
Sharp features
Abstract: Standard Clocks in the primordial epoch leave a special type of features in the primordial perturbations, which can be used to directly measure the scale factor of the primordial universe as a function of time a(t), thus discriminating between inflation and alternatives. We have started to search for such signals in the Planck 2013 data using the key predictions of the Standard Clock. In this Letter, we summarize the key predictions of the Standard Clock and present an interesting candidate example in Planck 2013 data. Motivated by this candidate, we construct and compute full Standard Clock models and use the more complete prediction to make more extensive comparison with data. Although this candidate is not yet statistically significant, we use it to illustrate how Standard Clocks appear in Cosmic Microwave Background (CMB) and how they can be further tested by future data. We also use it to motivate more detailed theoretical model building.
Publisher: Elsevier B.V.
ISSN: 0370-2693
Persistent Link: http://hdl.handle.net/10735.1/4315
http://dx.doi.org/10.1016/j.physletb.2014.11.002
Terms of Use: CC-BY 3.0 (Attribution)
©2014 The Authors
Sponsors: US National Science Foundation (PHY-1417421)

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CC-BY 3.0 (Attribution) Except where otherwise noted, this item's license is described as CC-BY 3.0 (Attribution)