HAL: hal-00716525, version 1

arXiv: 1105.6198

ADS Bibliographic id: 2011PhRvL.107l1301A

DOI: 10.1103/PHYSREVLETT.107.121301

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Physical Review Letters 107 (2011) 121301

Constraints on the Fundamental String Coupling from B-Mode Experiments

A. Avgoustidis, E. J. Copeland, A. Moss, L. Pogosian, A. Pourtsidou, D.A. Steer1

(2011-09)

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.

1:	APC - AstroParticule et Cosmologie

Research team: APC - THEORIE

Subject

:

Physics/General Relativity and Quantum Cosmology Physics/High Energy Physics - Theory

Keyword(s) : Particle-theory and field-theory models of the early Universe – String and brane phenomenology – Background radiations – Observational cosmology

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From: Danièle Steer <>

Submitted on: Tuesday, 10 July 2012 16:53:16

Updated on: Wednesday, 1 August 2012 13:16:32