Browsing by Author "c147a0de-8c97-4272-aa27-d31c294e97de"

Browsing by Author "c147a0de-8c97-4272-aa27-d31c294e97de"

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  • Junghans, Daniel; Zagermann, Marco (Heidelberg : Springer Verlag, 2018)
    We investigate de Sitter solutions of N= 1 supergravity with an F-term scalar potential near a no-scale Minkowski point, as they may in particular arise from flux compactifications in string theory. We show that a large ...
  • Bläbäck, Johan; Danielsson, Ulf H.; Junghans, Daniel; Van Riet, Thomas; Wrase, Timm; Zagermann, Marco (Heidelberg : Springer Verlag, 2012)
    We improve on the understanding of the backreaction of anti-D6-branes in a ux background that is mutually BPS with D6-branes. This setup is analogous to the study of the backreaction of anti-D3-branes inserted in the KS ...
  • Gautason, Fridrik Freyr; Junghans, Daniel; Zagermann, Marco (New York, NY : Springer International Publishing, 2013)
    We show that the classical cosmological constant in type II flux compactifications can be written as a sum of terms from the action of localized sources plus a specific contribution from non-trivial background fluxes. ...
  • Junghans, Daniel; Schmidt, Daniel; Zagermann, Marco (New York : Springer, 2014)
    We study AdS(7) vacua of massive type IIA string theory compactified on a 3-sphere with H-3 flux and anti-D6-branes. In such backgrounds, the anti-brane backreaction is known to generate a singularity in the H-3 energy ...
  • Caviezel, Claudio; Wrase, Timm; Zagermann, Marco (Heidelberg : Springer Verlag, 2010)
    We consider type IIB flux compactifications on six-dimensional SU(2)-structure manifolds with O5- and O7-planes. These six-dimensional spaces allow not only for F 3 and H3 fluxes but also for F 1 and F 5 fluxes. We derive ...
  • Louis, Jan; Triendl, Hagen; Zagermann, Marco (New York : Springer, 2015-10-13)
    We classify the N = 4 supersymmetric AdS(5) backgrounds that arise as solutions of five-dimensional N = 4 gauged supergravity. We express our results in terms of the allowed embedding tensor components and identify the ...
  • Gautason, Fridrik Freyr; Junghans, Daniel; Zagermann, Marco (Heidelberg : Springer Verlag, 2012)
    We examine to what extent perturbative α′-corrections can generate a small cosmological constant in warped string compactifications. Focusing on the heterotic string at lowest order in the string loop expansion, we show ...
  • Bena, Iosif; Junghans, Daniel; Kuperstein, Stanislav; Van Riet, Thomas; Wrase, Timm; Zagermann, Marco (Heidelberg : Springer Verlag, 2012)
    Anti-D-branes inserted in warped throat geometries (supported by fluxes that carry D-brane charges) develop unphysical singularities.It has been argued that these singularities could be resolved when one goes beyond the ...
  • Blaback, Johan; Danielsson, Ulf H.; Junghans, Daniel; Van Riet, Thomas; Wrase, Timm; Zagermann, Marco (New York, NY : Springer International Publishing, 2010)
    We investigate whether vacuum solutions in flux compactifications that are obtained with smeared sources (orientifolds or D-branes) still survive when the sources are localised. This seems to rely on whether the solutions ...
  • Zagermann, Marco (Trieste : International School for Advanced Studies, 2009)
    A brief overview of various branches of contemporary string cosmology is given with an emphasis on moduli stabilization, de Sitter vacua, inflation, cosmic strings and primordial gravitational waves.
  • Blaback, Johan; Danielsson, Ulf H.; Junghans, Daniel; Van Riet, Thomas; Wrase, Timm; Zagermann, Marco (New York, NY : Springer International Publishing, 2011)
    In this paper we investigate the localisation of SUSY-breaking branes which, in the smeared approximation, support specific non-BPS vacua. We show, for a wide class of boundary conditions, that there is no flux vacuum when ...
  • Apruzzi, Fabio; Gautason, Fridrik Freyr; Parameswaran, Susha L.; Zagermann, Marco (New York : Springer, 2015)
    We study to what extent Wilson lines in heterotic Calabi-Yau compactifications lead to non-trivial H-flux via Chern-Simons terms. Wilson lines are basic ingredients for Standard Model constructions but their induced H-flux ...