Imperial College London
Alternate

Prof Joao Magueijo

Faculty of Natural Sciences, Department of Physics

Professor of Physics
 
 
 
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Contact

 

j.magueijo Website

 
 
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Location

 

Huxley BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Gubitosi:2018:10.1103/PhysRevD.97.063502,
author = {Gubitosi, G and Magueijo, J},
doi = {10.1103/PhysRevD.97.063502},
journal = {PHYSICAL REVIEW D},
title = {Squeezing of scalar and tensor primordial perturbations generated by modified dispersion relations},
url = {http://dx.doi.org/10.1103/PhysRevD.97.063502},
volume = {97},
year = {2018}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - In recent work we analyzed the evolution of primordial perturbations satisfying Planck-scale-modified dispersion relations and showed that there is no cosmological “squeezing” in the critical model that produces perturbations with a scale invariant spectrum. Nevertheless, the perturbations reenter the horizon as standing waves with the correct temporal phase because of the late-time decay of the momentum mode. Here we shed light on the absence of primordial squeezing by reexamining the problem in the dual rainbow frame, where c is set to 1, shifting the varying c effects elsewhere. In this frame gravity switches off at sub-Planckian wavelengths, so that the fluctuations behave as if they were in Minkowski spacetime. This is ultimately why they are not squeezed. However, away from the critical model squeezing does occur if the fluctuations spectrum is red, as is the case for scalar perturbations. Should the primordial gravity waves have a blue spectrum, we predict that they might not reenter the horizon as standing waves, because the momentum mode would be enhanced in the primordial phase.
AU  - Gubitosi,G
AU  - Magueijo,J
DO  - 10.1103/PhysRevD.97.063502
PY  - 2018///
SN  - 2470-0010
TI  - Squeezing of scalar and tensor primordial perturbations generated by modified dispersion relations
T2  - PHYSICAL REVIEW D
UR  - http://dx.doi.org/10.1103/PhysRevD.97.063502
UR  - http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000426527100003&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
UR  - http://hdl.handle.net/10044/1/58448
VL  - 97
ER  -
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