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Comptes Rendus Physique
Volume 18, n° 3-4
pages 200-206 (mars 2017)
Doi : 10.1016/j.crhy.2017.04.001
String cosmology and the landscape
Le paysage des vides et la Cosmologie de la Théorie des Cordes
 

Iosif Bena , Mariana Graña
 Institut de physique théorique, Université Paris-Saclay, CEA, CNRS, L'Orme des Merisiers, 91191 Gif-sur-Yvette, France 

Corresponding author.
Abstract

String Theory is believed to have a landscape of 10500 vacua with properties that resemble those of our Universe. The existence of these vacua can be combined with anthropic reasoning to explain some of the hardest problems in cosmology and high-energy physics: the cosmological constant problem, the hierarchy problem, and the un-natural almost-flatness of the inflationary potential. We will explain the construction of these vacua, focusing on the challenges of obtaining vacua with a positive cosmological constant.

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Résumé

Il est généralement accepté que la théorie des cordes contient un paysage de 10500 solutions de vide avec des propriétés qui ressemblent à celles de notre Univers. L'existence de ces vides peut être utilisée dans un raisonnement anthropique pour expliquer certains des problèmes les plus ardus en cosmologie et en physique des hautes énergies : ceux de la constante cosmologique, de la hiérarchie et de la platitude du potentiel inflationnaire. Nous expliquerons la construction de ces vides, en insistant sur les défis posés par la construction des vides avec une constante cosmologique positive.

The full text of this article is available in PDF format.

Keywords : String theory, Vacuum landscape, Multiverse, De Sitter solutions

Mots-clés : Théorie des Cordes, Paysage des vides, Multivers, Solutions de Sitter


1  Since the antibrane is stuck at the orientifolds plane, it does not suffer from the instability of [[27]]. However, it is very unclear whether the resulting configuration can give rise to stable de Sitter solutions: the stability problem may turn out to be more severe than for antibranes away from orientifold planes: the combination of an antibrane and an orientifold plane has a non-zero charge yet zero mass. Such an object is not expected to be stable.


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