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Constraints on the Fundamental String Coupling from B-Mode Experiments
Avgoustidis A., Copeland E.J., Moss A., Pogosian L., Pourtsidou A. et al
Physical Review Letters 107 (2011) 121301 - http://hal.archives-ouvertes.fr/hal-00716525
Physique/Relativité Générale et Cosmologie Quantique
Physique/Physique des Hautes Energies - Théorie
Constraints on the Fundamental String Coupling from B-Mode Experiments
A. Avgoustidis, E. J. Copeland, A. Moss, L. Pogosian, A. Pourtsidou, D.A. Steer1
1 :  APC - UMR 7164 - AstroParticule et Cosmologie
CNRS : UMR7164 – IN2P3 – Observatoire de Paris – Université Paris VII - Paris Diderot – CEA : DSM/IRFU
APC - UMR 7164, Université Paris Diderot, 10 rue Alice Domon et Léonie Duquet, case postale 7020, F-75205 Paris Cedex 13
We study signatures of cosmic superstring networks containing strings of multiple tensions and Y junctions, on the cosmic microwave background (CMB) temperature and polarization spectra. Focusing on the crucial role of the string coupling constant gs, we show that the number density and energy density of the scaling network are dominated by different types of string in the gs˜1 and gs≪1 limits. This can lead to an observable shift in the position of the B-mode peak--a distinct signal leading to a direct constraint on gs. We forecast the joint bounds on gs and the fundamental string tension μF from upcoming and future CMB polarization experiments, as well as the signal to noise in detecting the difference between B-mode signals in the limiting cases of large and small gs. We show that such a detectable shift is within reach of planned experiments.

Physical Review Letters (Phys. Rev. Lett.)
Publisher American Physical Society
ISSN 0031-9007 (eISSN : 1079-7114)
Articles dans des revues avec comité de lecture

Particle-theory and field-theory models of the early Universe – String and brane phenomenology – Background radiations – Observational cosmology
4 pages, 4 figures

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