Article
Physics, Particles & Fields
A. P. Braun, R. Valandro
Summary: The study constructs G(4) fluxes to stabilize the 426 complex structure moduli of the sextic Calabi-Yau fourfold at the Fermat point, addressing the challenge of stabilization in models with many moduli. By using algebraic cycles, the researchers demonstrate how such fluxes can be constructed and analyze flat directions. It is observed that while symmetric fluxes can automatically solve multiple F-term equations, they often lead to flat directions.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Mariana Grana, Thomas W. Grimm, Damian van de Heisteeg, Alvaro Herraez, Erik Plauschinn
Summary: The tadpole conjecture suggests that the complete stabilization of complex structure deformations in Type IIB and F-theory flux compactifications is severely obstructed by the tadpole bound on the fluxes. We provide the first conceptual argument using asymptotic Hodge theory to explain the linear scaling setting and clarify why it sets in only for a large number of stabilized moduli.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Astronomy & Astrophysics
Markus Dierigl, Jonathan J. Heckman
Summary: The study explores the cobordism conjecture regarding the triviality of the bordism group of quantum gravity, predicting the presence of D7-branes in type IIB string theory on a compactified circle. The non-Abelian structure of the IIB duality group SL(2, Z) implies the existence of additional 7-branes, with this information captured by closed paths on the moduli space of elliptic curves. By combining this conjecture with the Swampland conjecture, predictions are made for the allowed Mordell-Weil torsion groups in 8D F-theory vacua.
Article
Astronomy & Astrophysics
Mirjam Cvetic, Ling Lin, Andrew P. Turner
Summary: This article argues for the quantum-gravitational inconsistency of certain 6D N = (1, 0) supergravity theories and explains why the majority of these theories are not compatible with quantum gravity constraints using flavor symmetries. It also discusses how the automatic enhancement to a larger gauge sector remedies this inconsistency.
Article
Astronomy & Astrophysics
Mirjam Cvetic, Markus Dierigl, Ling Lin, Hao Y. Zhang
Summary: This article discusses a method to classify 8D N=1 string vacua using string and brane junctions, which involves extending the description of ordinary 7-branes to include O7(+) planes and encoding the dynamics of sp(n) gauge algebras. Loop junctions play a central role in revealing the affine symmetries of emergent 9D descriptions at the boundaries of the 8D moduli space.
Article
Physics, Particles & Fields
Andreas P. P. Braun, Bernardo Fraiman, Mariana Grana, Severin Lust, Hector Parra De Freitas
Summary: The tadpole conjecture suggests that complex structure moduli stabilisation by fluxes with low tadpole charge can only happen at special points in moduli space, resulting in (large) gauge symmetries. In this study, we examine F-theory flux compactifications on products of attractive K3 surfaces to determine the gauge symmetries when the complex structure moduli are fully stabilised. We find that the minimal rank of the non-abelian gauge group is always non-zero and decreases linearly with the tadpole charge, reaching zero at charge 30. Additionally, we identify all simple ADE Lie algebras of rank & LE; 18 for different tadpole values.
JOURNAL OF HIGH ENERGY PHYSICS
(2023)
Article
Physics, Particles & Fields
Jose Calderon-Infante, Ignacio Ruiz, Irene Valenzuela
Summary: We investigate the possibility of universal runaway behavior of stringy scalar potentials leading to an accelerated expanding cosmology, similar to quintessence. By considering several competing terms of the potential in the asymptotic regime, we find a loophole in the proposed bounds that forbid such accelerated expansion in 4d N = 1 supergravities. We analyze specific string theory examples from F-theory flux compactifications on Calabi-Yau fourfolds, extending previous results by considering different infinite distance limits in the complex structure moduli space. We identify potential candidates for asymptotic accelerated expansion with a flux potential satisfying the condition ||del V ||/ (V) < v2 along its gradient flow, but further study of moduli stabilization, including the Kahler moduli, is required to verify whether this truly describes an accelerated expanding cosmology.
JOURNAL OF HIGH ENERGY PHYSICS
(2023)
Article
Physics, Particles & Fields
M. Cicoli, F. Quevedo, R. Savelli, A. Schachner, R. Valandro
Summary: Extracting reliable low-energy information from string compactifications requires understanding the UV sensitivity of the corresponding effective field theories. This study focuses on the moduli dependence of perturbative corrections to the 4D scalar potential in type IIB Calabi-Yau orientifold compactifications. Two strategies are employed to infer the dependence of perturbative corrections on both the dilaton and the Calabi-Yau volume. The research also shows that KK reductions on elliptically-fibred Calabi-Yau fourfolds can only generate (alpha')(even) corrections to the 4D scalar potential.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Astronomy & Astrophysics
Markus Dierigl, Jonathan J. Heckman, Miguel Montero, Ethan Torres
Summary: The swampland cobordism conjecture predicts successfully the supersymmetric spectrum of 7-branes of IIB/F-theory. It also predicts the existence of nonsupersymmetric reflection 7-branes (R7-branes) at strong coupling. R7-branes serve as end of the world branes for 9D theories obtained from type IIB asymmetric orbifold and Dabholkar-Park orientifold backgrounds, and the analysis suggests the presence of a gapless Weyl fermion with the quantum numbers of a goldstino. General arguments imply that different types of branes can end on the R7, and the charge accounting requires exotic localized degrees of freedom, possibly a massless 3-form field on the R7-brane worldvolume. The extension of the standard F-theory formalism to account for reflections is also shown.
Article
Astronomy & Astrophysics
Jacques Distler, Monica Jinwoo Kang, Craig Lawrie
Summary: This paper presents a new extension to the geometric construction of six-dimensional (6D) (1,0) superconformal field theories (SCFTs), which can encapsulate Higgs branch structures with identical global symmetry but different spectra. By augmenting the tensor branch description, it is possible to predict the differences in conformal dimension of Higgs branch operators of different theories.
Article
Physics, Particles & Fields
Fernando Marchesano, David Prieto, Max Wiesner
Summary: In this study, we compute the flux-induced F-term potential in 4d F-theory compactifications at large complex structure. We identify two families of vacua where complex structure fields are fixed and flux contributions are bounded. Our analysis provides explicit general expressions for the potential and explores the set of flux vacua for an arbitrary number of fields, linking our findings to previous results in the literature.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Manki Kim
Summary: In this note, we prove combinatorial formulas for the Hodge number h(2,1) of prime toric divisors in an arbitrary toric hypersurface Calabi-Yau fourfold Y-4. We show that it is possible to find a toric hypersurface Calabi-Yau in which there are more than h(1,1)(Y-4) non-perturbative superpotential terms with trivial intermediate Jacobian.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Multidisciplinary
Abhijit Let, Arunoday Sarkar, Chitrak Sarkar, Buddhadeb Ghosh
Summary: We derive a single-field slow-roll inflaton potential in a three-intersecting-D7-branes configuration under type-IIB/F-theory compactification. Two of the resulting Kahler moduli are stabilized through perturbative corrections in the Kahler potential arising from the large-volume scenario (alpha'(3)) and four-graviton scattering amplitude up to one loop level, while the remaining Kahler modulus is stabilized by a KKLT-type non-perturbative correction in the superpotential. The symmetric combination of two canonically normalized and perturbatively stabilized Kahler moduli serves as the inflaton field, while the anti-symmetric combination manifests as an auxiliary field.
Article
Physics, Particles & Fields
Simon Ekhammar, Bengt E. W. Nilsson
Summary: The study focuses on deriving major parts of the eigenvalue spectrum of operators on the squashed seven-sphere in the compactification of eleven-dimensional supergravity, which determine the mass spectrum of fields in AdS(4) and are important for N = 1 supermultiplet structure. This work extends previous research on the complete spectrum of irreducible isometry representations of fields in AdS(4) and provides comments on the implications of G(2) holonomy on the structure of operator equations on the squashed seven-sphere.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Suddhasattwa Brahma, Keshav Dasgupta, Radu Tatar
Summary: In this study, it is shown that four-dimensional de Sitter space can be seen as a Glauber-Sudarshan state over a supersymmetric solitonic background in full string theory, and its fluctuations are governed by the Agarwal-Tara state. Once de Sitter space is realized as a coherent state rather than a vacuum, issues regarding its stability, vacuum energy, and entropy seem to have clear resolutions.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)