Results 101 to 110 of about 808 (166)

Fermionic T-duality and U-duality in type II supergravity

open access: yes, 2011
PhDThis thesis deals with the two duality symmetries of N = 2 D = 10 supergravity theories that are descendant from the full superstring theory: fermionic T-duality and U-duality.
Bakhmatov, Ilya
core  

Fluxes, Hierarchies, and Metastable Vacua in Supersymmetric Field Theories

open access: yes, 2007
This thesis concerns topics both in low-energy effective field theories from type IIB superstring flux compactifications and in fourdimensional, rigidly supersymmetric gauge theories.
Brümmer, Felix
core   +1 more source

From Minkowski to de Sitter in multifield no-scale models

open access: yesJournal of High Energy Physics, 2019
We show the uniqueness of superpotentials leading to Minkowski vacua of single-field no-scale supergravity models, and the construction of dS/AdS solutions using pairs of these single-field Minkowski superpotentials.
John Ellis   +4 more
doaj   +1 more source

T-duality invariant approaches to string theory

open access: yes, 2010
PhDThis thesis investigates the quantum properties of T-duality invariant formalisms of String Theory. We introduce and review duality invariant formalisms of String Theory including the Doubled Formalism.
Thompson, Daniel C, Thompson, Daniel C.
core  

The String Swampland and de Sitter Vacua: A Consistent Perspective for Superstrings and Multi-fold Universes

open access: yes, 2023
In a multi-fold universe, gravity emerges from Entanglement through the multi-fold mechanisms. As a result, gravity-like effects appear in between entangled particles that they be real or virtual. Long range, massless gravity results from entanglement of massless virtual particles.
openaire   +1 more source

Abelian F-theory models with charge-3 and charge-4 matter

open access: yesJournal of High Energy Physics, 2018
This paper analyzes U(1) F-theory models admitting matter with charges q = 3 and 4. First, we systematically derive a q = 3 construction that generalizes the previous q = 3 examples.
Nikhil Raghuram
doaj   +1 more source

The enhancon mechanism in string theory [PDF]

open access: yes, 2002
The enhancon mechanism is a specific phenomenon in string theory which resolves a certain naked spacetime singularity arising in the supergravity description related to N = 2 supersymmetric pure gauge theory.
Järv, Laur
core  

Uncovering quasi-degenerate Kaluza-Klein Electro-Weak gauge bosons with top asymmetries at the LHC

open access: yes, 2013
By exploiting the correlation between charge and spin polarisation asymmetries in t-tbar, we show that combining the two observables could identify the presence of quasi-degenerate states in a resonant signal at the LHC.
Moretti, S., Accomando, E., Mimasu, K.
core   +1 more source

Conflicts with de Sitter Vacua in Superstring Theory

open access: yesMcGill Science Undergraduate Research Journal
Models of our universe lack consistency at different energy scales, so we require a theory with ultraviolet (UV) completion such as string theory. A suitable candidate to model our universe in this framework is de Sitter space, a spacetime which expands and has positive curvature.
openaire   +1 more source

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