Consistent Supersymmetric Decoupling in Cosmology

Author(s):
Sousa Sánchez, K.
Published
2012
Publication type
Doctoral Thesis

Abstract

The present work discusses several

problems related to the stability of ground states with broken

supersymmetry in supergravity, and to the existence and stability of

cosmic strings in various supersymmetric models. In particular we study the necessary conditions to truncate consistently a sector of an N=1 supergravity theory while preserving supersymmetry, and on those models where these conditions are met we discuss how the breaking of supersymmetry in the light sector affects the stability of the truncated fields. In this thesis we also present a new type of supersymmetric cosmic string solutions in N = 2 supergravity. The corresponding model admits a family of cosmic string solutions with the same energy but different core radius. We study the stability of these strings against perturbations in a cosmological context, where the zero mode connecting different solutions within a family could be excited, leading to the spread of the magnetic flux and the disappearence of the string.

BPSCosmic stringsCosmologyDecouplingModuliStabilitySupergravitySupersymmetryTruncation
Defense date
2012-06-20
Language
English
Supervisor(s)
Achúcarro, A.
Committee member(s)
Davis, C.A.; Eliel, E.R.; Holten, J.-W. van; Palma, G.A.; Schalm, K.
Qualification
Ph.D.
Degree granting institution
Leiden Institute of Physics (LION), Faculty of Science, Leiden University, Leiden
hdl
1887/19115
ISBN(s)
9789085931270
URL
http://hdl.handle.net/1887/19115

Juridical information

Court
LEI Universiteit Leiden

Funding

Sponsorship
- Basque Government through the grant BFI04.203. - Dutch Organization for Scientific Research (N.W.O.) via the VICI grant 680-47-320. -The department of Theoretical Physics and History of Science at the University of the Basque Country.