Results 81 to 90 of about 572 (144)

Heterotic complex structure moduli stabilization for elliptically fibered Calabi-Yau manifolds

Journal of High Energy Physics, 2021
Holomorphicity of vector bundles can stabilize complex structure moduli of a Calabi-Yau threefold in N = 1 supersymmetric heterotic compactifications. In principle, the Atiyah class determines the stabilized moduli.
Wei Cui, Mohsen Karkheiran
doaj   +1 more source

Cosmic necklaces in string theory and field theory [PDF]

, 2010
PhDIn this thesis we investigate astrophysical phenomena which arise in models with compact extra dimensions, focussing on the cosmological consequences of strings which wrap cycles in the internal space. Embedding our strings in the Klebanov-Strassler
Lake, Matthew James
core  

Geometry of black holes and braneworlds in higher dimensions [PDF]

, 2004
This tliesis first discusses braneworld models, we explain how the bulk geometry in codimension 2 scenarios restricts braneworld fields in a way inconsistent with observation.
Paul B. Bostock, Bostock, Paul B, Bostock, Paul B.   +2 more
core  

G-structures and superstrings from the worldsheet [PDF]

, 2019
G-structures, where G is a Lie group, are a uniform characterisation of many differential geometric structures of interest in supersymmetric compactifications of string theories.
Marc-Antoine Fiset, Fiset, Marc-Antoine
core   +2 more sources

Superstring amplitudes from BCJ numerators at one loop

Journal of High Energy Physics
We find a direct map that determines moduli-space integrands for one-loop superstring amplitudes in terms of field-theory loop integrands in the BCJ form. The latter can be computed using efficient unitarity methods, so our map provides an alternative to
Yvonne Geyer, Jiachen Guo, Ricardo Monteiro, Lecheng Ren   +3 more
doaj   +1 more source

Inverse of the string theory KLT kernel

Journal of High Energy Physics, 2017
The field theory Kawai-Lewellen-Tye (KLT) kernel, which relates scattering amplitudes of gravitons and gluons, turns out to be the inverse of a matrix whose components are bi-adjoint scalar partial amplitudes.
Sebastian Mizera
doaj   +1 more source

braneworld cosmology and holography [PDF]

, 2002
This thesis is devoted to studying two important aspects of braneworld physics: their cosmology and their holography. We examine the Einstein equations induced on a general (n - 2)-brane of arbitrary tension, embedded in some n-dimensional bulk.
Padilla, Antonio
core  

Superstring amplitudes from the field-theory limit: an n-point map at one loop

Journal of High Energy Physics
Are perturbative superstring amplitudes for massless external states just an α ′ dressing of super-Yang-Mills/supergravity? This is the case at tree level, where the worldsheet correlators at n points can be written in a natural worldsheet basis, such ...
Ricardo Monteiro, Lecheng Ren
doaj   +1 more source

Higher dimensional theories in physics, following the Kaluza model of unification [PDF]

, 1989
This thesis traces the origins and evolution of higher dimensional models in physics, with particular reference to the five-dimensional Kaluza-Klein unification.
Middleton, Eric William
core  

Towards the underlying gauge theory of the pure spinor superstring

Journal of High Energy Physics, 2019
Previous attempts to determine the worldsheet origin of the pure spinor for­malism were not completely successful, but introduced important concepts that seem to be connected to its fundamental structure, e.g., emergent supersymmetry and the role of ...
Renann Lipinski Jusinskas
doaj   +1 more source