Zobrazeno 1 - 7
of 7
pro vyhledávání: '"Sjors, Stefan"'
Publikováno v:
Journal of High Energy Physics 12 (2014) 077
We evaluate string one-loop contributions to the Kahler metric of closed string moduli in toroidal minimally supersymmetric (Calabi-Yau) orientifolds with D-branes. We focus on the poorly understood N=1 sectors that receive contributions from all mas
Externí odkaz:
http://arxiv.org/abs/1407.0027
We perform cosmological perturbation theory in Hassan-Rosen bimetric gravity for general homogeneous and isotropic backgrounds. In the de Sitter approximation, we obtain decoupled sets of massless and massive scalar gravitational fluctuations. Matter
Externí odkaz:
http://arxiv.org/abs/1206.3496
Autor:
Sjors, Stefan, Mortsell, Edvard
In this paper, analytical solutions describing static and spherically symmetric sources in the decoupling limit of massive gravity are derived. We analyze the model parameter range and specify when a Vainshtein mechanism is possible. Furthermore, we
Externí odkaz:
http://arxiv.org/abs/1111.5961
We develop a perturbative expansion scheme for solving general boundary value problems in a broad class of type IIB flux compactifications. The background solution is any conformally Calabi-Yau compactification with imaginary self-dual (ISD) fluxes.
Externí odkaz:
http://arxiv.org/abs/1106.0002
Publikováno v:
Phys.Rev.D81:103535,2010
We present a simple two-field model of inflation and show how to embed it in string theory as a straightforward generalization of axion monodromy models. Phenomenologically, the predictions are equivalent to those of chaotic inflation, and in particu
Externí odkaz:
http://arxiv.org/abs/0912.1341
Publikováno v:
JCAP 0908:035,2009
We study thermal neutralino dark matter in an effective field theory extension of the MSSM, called "Beyond the MSSM" (BMSSM) in Dine, Seiberg and Thomas (2007). In this class of effective field theories, the field content of the MSSM is unchanged, bu
Externí odkaz:
http://arxiv.org/abs/0906.0583
Autor:
Sjörs, Stefan
This thesis deals with phenomenological and theoretical aspects of cosmoparticle physics and string theory. There are many open questions in these topics. In connection with cosmology we would like to understand the detailed properties of dark matter
Externí odkaz:
http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-74928