Results 71 to 80 of about 808 (166)
Nonrenormalization of the superstring tension
, 1989 It is argued that the superstring tension is not renormalized in perturbation theory for vacua which preserve N=1 spacetime supersymmetry. Some implications of this result for macroscopic superstrings are discussed, as well as some analogies between ...
Harvey, Jeffrey A., Dabholkar, Atish
core +1 more source
Fortschritte der Physik, Volume 73, Issue 1-2, February 2025.Abstract S. Gukov and C. Vafa proposed a characterization of rational N=(1,1)$N=(1,1)$ superconformal field theories (SCFTs) in 1+1$1+1$ dimensions with Ricci‐flat Kähler target spaces in terms of the Hodge structure of the target space, extending an earlier observation by G. Moore.
Abhiram Kidambi +2 more
wiley +1 more source
Inflation with a graceful exit in a random landscape
Journal of High Energy Physics, 2017 We develop a stochastic description of small-field inflationary histories with a graceful exit in a random potential whose Hessian is a Gaussian random matrix as a model of the unstructured part of the string landscape.
F. G. Pedro, A. Westphal
doaj +1 more source
On (scalar QED) gravitational positivity bounds
Journal of High Energy Physics, 2023 We study positivity bounds in the presence of gravity. We first review the gravitational positivity bound at the tree-level, where it is known that a certain amount of negativity is allowed for the coefficients of higher-derivative operators. The size of
Yuta Hamada +3 more
doaj +1 more source
Marginal deformations of vacua with massive boson–fermion degeneracy symmetry
, 2010 Two-dimensional string vacua with Massive Spectrum boson–fermion Degeneracy Symmetry, [MSDS]d=2, are explicitly constructed in Type II and Heterotic superstring theories.
Florakis, Ioannis +2 more
core +1 more source
T‐Symmetry in String Geometry Theory
Advances in High Energy Physics, Volume 2025, Issue 1, 2025.String geometry theory is one of the candidates of nonperturbative formulation of string theory. In this paper, we have shown that dimensionally reduced string geometry theories have what we call T‐symmetry. In the case of the dimensional reduction in space‐like directions, the T‐symmetry transformation gives the T‐dual transformation between the Type ...
Matsuo Sato +2 more
wiley +1 more source
Tadpole conjecture in non-geometric backgrounds
Journal of High Energy PhysicsCalabi-Yau compactifications have typically a large number of complex structure and/or Kähler moduli that have to be stabilised in phenomenologically-relevant vacua. The former can in principle be done by fluxes in type IIB solutions.
Katrin Becker +5 more
doaj +1 more source
Journal of High Energy Physics, 2019 In this note we revisit some of the recent 10d and 4d arguments suggesting that the uplifting of supersymmetric AdS vacua leads to a flattening of the potential, preventing the formation of dS vacua.
Renata Kallosh +3 more
doaj +1 more source
Journal of High Energy Physics, 2020 We study the topological properties of Calabi-Yau threefold hypersurfaces at large h 1,1. We obtain two million threefolds X by triangulating polytopes from the Kreuzer-Skarke list, including all polytopes with 240 ≤ h 1,1 ≤ 491.
Mehmet Demirtas +3 more
doaj +1 more source
Mass spectrum of type IIB flux compactifications — comments on AdS vacua and conformal dimensions
Journal of High Energy Physics, 2023 In this note we study the mass spectrum of type IIB flux compactifications. We first give a general discussion of the mass matrix for F-term vacua in four-dimensional N $$ \mathcal{N} $$ = 1 supergravity theories and then specialize to type IIB Calabi ...
Erik Plauschinn
doaj +1 more source