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, Particles & Fields
Severin Lust, Max Wiesner
Summary: This paper focuses on moduli stabilization on Calabi-Yau manifolds with a discrete symmetry. By using invariant fluxes, the dimensionality of the problem is significantly reduced, allowing for a bypass of the constraints predicted by the tadpole conjecture.
JOURNAL OF HIGH ENERGY PHYSICS
(2023)
Article
Physics, Particles & Fields
Aybike Catal-Ozer, Emine Dirioz
Summary: This paper discusses the conditions required to preserve N = 1 supersymmetry in a supersymmetric compactification of Type II supergravity, as well as the solution generating transformation for pure spinor equations. The study shows that non-Abelian T-duality (NATD) is a solution generating transformation for these pure spinor equations.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Emanuel Malek, Yuho Sakatani, Daniel C. Thompson
Summary: The exceptional Drinfel'd algebra (EDA) is introduced as a Leibniz algebra to explore generalised notions of U-duality in M-theory. It provides an M-theoretic analogue of how a Drinfel'd double encodes generalised T-dualities of strings. The construction of the EDA, illustrated with examples, includes geometric realizations and natural generalizations of classical equations.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Michele Cicoli, Andreas Schachner, Pramod Shukla
Summary: This article investigates the problem of moduli stabilisation in superstring compactifications on Calabi-Yau orientifolds and provides novel insights into the F-term scalar potential. By considering superpotential contributions with different moduli dependences, we prove the existence of a no-scale structure for odd moduli and derive the exact expressions for the no-scale breaking effects. Finally, we calculate the Hessian for odd moduli and discuss potential phenomenological implications.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Particles & Fields
Bruno Valeixo Bento, Dibya Chakraborty, Susha Parameswaran, Ivonne Zavala
Summary: This article investigates various string-loop, warping, and curvature corrections in type IIB moduli stabilisation scenarios. By studying weakly-warped LVS de Sitter vacua, it is found that some corrections become less problematic and even helpful in reaching the weakly-warped parameter space. However, other corrections remain dangerous and require small numerical coefficients to preserve the consistency of the weakly-warped LVS de Sitter solution.
JOURNAL OF HIGH ENERGY PHYSICS
(2023)
Article
Physics, Particles & Fields
Arthur Hebecker, Simon Schreyer, Gerben Venken
Summary: There has been recent interest in the possibility of accelerated cosmological expansion in the asymptotic regions of a d-dimensional EFT. It is conjectured that such acceleration is only possible if there are metastable de Sitter vacua in more than d dimensions. This result is in line with Swampland bounds on the potential in the field space asymptotics. Additionally, it is found that the Kaluza-Klein scale always falls below the Hubble scale in these asymptotic decompactification limits.
JOURNAL OF HIGH ENERGY PHYSICS
(2023)
Article
Physics, Particles & Fields
Thomas W. Grimm, Erik Plauschinn, Damian van de Heisteeg
Summary: We propose a new strategy for studying complex-structure moduli stabilization in Type IIB and F-theory flux compactifications. By utilizing the tools of asymptotic Hodge theory, we determine vacua in any asymptotic regime of the complex-structure moduli space. In a leading approximation, we find that the moduli dependence of the vacuum conditions follows a polynomial behavior with a dependence given by sl(2)-weights of the fluxes. We provide a pedagogical introduction to the sl(2)-approximation and a step-by-step procedure for constructing the corresponding Hodge star operator. Our analysis of Calabi-Yau examples demonstrates the accuracy of the sl(2)-approximation and allows us to determine the behavior of the fluxes' tadpole contribution. Furthermore, we discuss the structure of vacuum loci and their relationship to swampland conjectures, specifically the realization of the linear scenario in view of the tadpole conjecture.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
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
Physics, Particles & Fields
Heliudson Bernardo, Suddhasattwa Brahma, Keshav Dasgupta, Radu Tatar
Summary: By constructing purely non-perturbative anti-de Sitter vacua in string theory, a new class of phenomenological dS vacua with novel characteristics is generated, avoiding obstacles in other dS constructions. However, constructing TCC-compatible vacua presents difficulties both phenomenologically and in terms of temporal dependencies.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Konstantinos Tsagkaris, Erik Plauschinn
Summary: In this article, we study the moduli stabilization in Calabi-Yau orientifold compactifications of type IIB string theory with O3- and O7-planes. By using three-form fluxes, we stabilize all axio-dilaton and complex-structure moduli for a Calabi-Yau three-fold with Hodge number h(2,1) = 50. To address this issue, we develop an algorithm to generate 10(5) flux vacua with small flux number N-flux. Based on recent results, we estimate the bound imposed by the tadpole-cancellation condition as N-flux <= O(10(3)), but the smallest flux number we obtain in our search is of order N-flux = O(10(4)). This implies that the tadpole conjecture is satisfied for all solutions to the F-term equations in our data set.
JOURNAL OF HIGH ENERGY PHYSICS
(2023)
Article
Physics, Particles & Fields
Manki Kim
Summary: The study focuses on the non-perturbative superpotential generated by D(-1)-branes on Calabi-Yau threefold hypersurfaces in type IIB compactifications on orientifolds. By computing the Picard-Fuchs equations in the global Sen-limit, it is shown that the elliptic Calabi-Yau fourfolds do not contain exponentially suppressed terms. This implies that the superpotential of the underlying type IIB compactification in the global Sen-limit does not receive D(-1)-instanton contributions.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Particles & Fields
Daniel Junghans
Summary: In this article, we elaborate on the self-consistency of de Sitter vacua in the LARGE-volume scenario of type IIB string theory. We analyze the control over warping, curvature, and g(s) corrections, which depend on the compactification's topology and orientifold/brane data. By computing a general bound on the magnitude of these corrections, we find that the D3 tadpole is strongly constrained. The required tadpole ranges from O(500) to O(10(6)) or more, depending on factors such as the Euler number of the Calabi-Yau 3-fold, the triple-self-intersection and Euler numbers of the small divisor, and the coefficient a(s) in the non-perturbative superpotential.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Particles & Fields
George K. Leontaris, Pramod Shukla
Summary: In this work, we investigate the moduli stabilisation problem and the requirements for de Sitter vacua in type IIB string theory. We present a moduli stabilisation scheme that achieves a large overall volume and discuss the possibility of de Sitter vacua through appropriate contributions in the effective potential.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Particles & Fields
Suddhasattwa Brahma, Keshav Dasgupta, Radu Tatar
Summary: In this paper, de Sitter space is identified as a coherent state, which can only be realized in full string theory when combined with temporally varying degrees of freedom and quantum corrections. Viewing de Sitter space as a state rather than a vacuum resolves many issues associated with its entropy, zero-point energy, and trans-Planckian censorship.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Astronomy & Astrophysics
J. A. Casas, G. A. Gomez Vargas, J. M. Moreno, J. Quilis, R. Ruiz de Austri
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2018)
Article
Physics, Particles & Fields
D. G. Cerdeno, A. Cheek, P. Martin-Ramiro, J. M. Moreno
EUROPEAN PHYSICAL JOURNAL C
(2019)
Article
Physics, Particles & Fields
Adolfo Guarino, Javier Tarrio, Oscar Varela
JOURNAL OF HIGH ENERGY PHYSICS
(2019)
Article
Physics, Particles & Fields
Adolfo Guarino, Javier Tarrio, Oscar Varela
JOURNAL OF HIGH ENERGY PHYSICS
(2020)
Article
Physics, Particles & Fields
Adolfo Guarino, Colin Sterckx, Mario Trigiante
JOURNAL OF HIGH ENERGY PHYSICS
(2020)
Article
Physics, Particles & Fields
Adolfo Guarino, Javier Tarrio, Oscar Varela
JOURNAL OF HIGH ENERGY PHYSICS
(2020)
Article
Physics, Multidisciplinary
Adolfo Guarino, Emanuel Malek, Henning Samtleben
Summary: The study analyzes and computes the full bosonic Kaluza-Klein spectrum around the G(2)-invariant nonsupersymmetric AdS(4) solution of massive IIA supergravity and six other nonsupersymmetric AdS(4) solutions, demonstrating their perturbative stability. The findings challenge the swampland conjecture by suggesting potential nonperturbative stability of these AdS vacua.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Particles & Fields
Adolfo Guarino, Colin Sterckx
Summary: This work investigates holographic RG flows on the D3-brane for Type IIB S-folds, showing how anisotropic deformations of SYM4 in the UV are connected to S-fold CFT's in the IR with different amounts of supersymmetry and flavour symmetries. Additionally, examples of holographic RG flows between S-fold CFT's are presented, along with a geometric interpretation of axion deformations in terms of monodromies on the internal S-5 when moving around the S-1.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
J. A. Aguilar-Saavedra, M. C. N. Fiolhais, P. Martin-Ramiro, J. M. Moreno, A. Onofre
Summary: We have developed a template method for measuring the polarization of t(t)over bar pairs produced in hadron collisions. This method can extract the individual fractions of different polarization pairs and also provide the net polarization of t and (t)over bar, as well as their spin correlation for arbitrary axes.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Article
Physics, Particles & Fields
Adolfo Guarino, Colin Sterckx
Summary: The paper discusses flat deformations in Type IIB S-fold models, providing a group-theoretical characterization and a 5D interpretation involving so(6)-valued duality twists. It establishes the existence of two flat deformations in the N = 4 and SO(4) symmetric S-folds, causing symmetry breaking down to its U(1)(2) Cartan subgroup. The result is a new two-parameter family of non-supersymmetric S-folds, perturbatively stable at the lower-dimensional supergravity level, serving as the first examples of such backgrounds in Type IIB.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Andres Anabalon, Miguel Chamorro-Burgos, Adolfo Guarino
Summary: This study constructs multi-parametric and analytic families of four-dimensional AdS(3) x R (Janus) and AdS(3) x R+ (Hades) solutions in the SO(8) gauged supergravity. These solutions are generally non-supersymmetric, involve non-trivial running scalars and preserve a U(1)(4) symmetry. Upon suitable adjustment of the free parameters, different patterns of (super) symmetry enhancement can occur.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Particles & Fields
Adolfo Guarino, Minwoo Suh
Summary: We investigate supersymmetric flows in type IIB supergravity that preserve an SO(2, 2) space-time symmetry and asymptote to AdS(5)x S-5 at both endpoints. The flows are constructed as Janus-type Double-struck capital R x AdS(3) BPS domain-walls in the effective four-dimensional [SO(1, 1) x SO(6)] proportional to R-12 gauged maximal supergravity describing the massless sector of type IIB supergravity compactified on S-1 x S-5. The compactification includes an S-duality hyperbolic twist along the S-1 which, when combined with an appropriate choice of boundary conditions for the running scalars, generates special flows that develop an S-fold regime at their core, thus enhancing the space-time symmetry there to SO(2, 3). Via the AdS/CFT correspondence, the flows constructed here are conjectured to describe conformal interfaces in a circle compactification of N = 4 SYM4.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Astronomy & Astrophysics
J. A. Aguilar-Saavedra, A. Bernal, J. A. Casas, J. M. Moreno
Summary: In this paper, we discuss quantum entanglement and violation of Bell inequalities in the H-ZZ decay, with a focus on the decay of the two Z-bosons into light leptons. We propose a novel framework to extract relevant information regarding these phenomena from the H-ZZ data, particularly spin correlation observables. We derive sufficient and necessary conditions for entanglement and an improved condition for the violation of Bell-type inequalities. Numerical analysis shows that entanglement can be probed at greater than 3a level with a luminosity of L = 300 fb-1. For L = 3 ab-1 (HL-LHC), entanglement can be probed beyond the 5a level, while the sensitivity to a violation of the Bell inequalities is at the 4.5a level.
Article
Physics, Particles & Fields
A. Bernal, J. A. Casas, J. M. Moreno
Summary: The Two-Higgs Doublet Model (2HDM) is a popular extension of the Higgs sector, but it faces two potential fine-tuning problems related to electroweak breaking and alignment with the SM Higgs boson. This study quantifies the fine-tunings and provides analytical expressions for both the initial parameters and physical parameters. It also reveals that the severe fine-tunings occur in different regions of the parameter space, and a remarkable trend is observed where large tan beta values mitigates the fine-tunings. Numerical analysis of representative scenarios confirms these findings.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Article
Astronomy & Astrophysics
Alfredo Giambrone, Adolfo Guarino, Emanuel Malek, Henning Samtleben, Colin Sterckx, Mario Trigiante
Summary: We provide the first holographic evidence for the existence of a nonsupersymmetric conformal manifold resulting from exactly marginal but supersymmetry-breaking deformations. Specifically, we construct a 2-parameter nonsupersymmetric deformation of a supersymmetric AdS nongeometric background in type 1IB string theory. We prove the perturbative stability of the nonsupersymmetric backgrounds and their protection against various nonperturbative instabilities. Additionally, we argue that diffeomorphism symmetry safeguards our solutions against higher-derivative string corrections.