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Article
Physics, Particles & Fields
Cody Long et al.
Summary: In this paper, we study the desert scenario in the moduli space of supergravity theories, and relate the number of massless modes to the black hole species problem. We find that a consistent sub-Planckian UV cutoff, known as the species scale, can resolve the black hole species problem without imposing a bound on the number of light modes. However, in the context of supersymmetric string vacua, we observe a stronger dependence of the cutoff scale on the number of massless modes due to the presence of BPS states.
JOURNAL OF HIGH ENERGY PHYSICS
(2023)
Article
Physics, Particles & Fields
Seung-Joo Lee et al.
Summary: In this paper, we propose a conjecture that a quantum gravitational theory in an infinite distance limit of its moduli space either decompactifies or reduces to an asymptotically tensionless, weakly coupled string theory. We support this claim by classifying the behavior of M-Theory and Type IIA string theory compactifications on Calabi-Yau three-folds at infinite distances in Kahler moduli space. The analysis reveals that different types of fibrations lead to different outcomes, including decompactification to F-Theory and emergence of tensionless heterotic or Type II strings.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Particles & Fields
Veronica Collazuol et al.
Summary: We demonstrate that compactifications of the heterotic string on a circle exhibit a tower of winding or momentum modes at the boundary of moduli space (R -> 0 or R -> infinity), which enhance the E(8)xE(8) or SO(32) gauge symmetry to the affine algebras (E-9 circle plus E-9)/ similar to (with the identification the two copies of E-9 share the same central extension) and D-16. Furthermore, we prove that these towers of modes satisfy the lattice weak gravity and repulsive force conjectures.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Particles & Fields
Seung-Joo Lee et al.
Summary: We investigate infinite distance limits in the complex structure moduli space of F-theory compactified on K3 to eight dimensions. The main part of the paper shows that all degenerations of elliptic K3 surfaces at infinite distance can be interpreted as (partial) decompactification or emergent string limits in F-theory. In the second part, we discuss the infinite distance behavior of certain exact quartic gauge couplings and encounter a tension with the hypothesis of effective couplings.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Review
Physics, Multidisciplinary
Marieke van Beest et al.
Summary: The Swampland program aims to determine the constraints that must be satisfied by an effective field theory to be consistent with a UV embedding in a quantum gravity theory. This article provides a pedagogical introduction to the most important Swampland conjectures, their connections, and their realization in string theory compactifications.
PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS
(2022)
Article
Physics, Particles & Fields
Seung-Joo Lee et al.
Summary: Motivated by the Swampland Distance and the Emergent String Conjecture, this paper analyzes the infinite distance degenerations in the complex structure moduli space of elliptic K3 surfaces. The classification and characterization of Weierstrass models associated with Type II and Type III Kulikov models for elliptic K3 surfaces are presented. The relationship between infinite distance limits and degenerations of Weierstrass models is explored. The results provide the basis for the classification of the infinite distance limits of elliptic K3 surfaces using F-theory.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Astronomy & Astrophysics
Mirjam Cvetic et al.
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
Miguel Montero et al.
Summary: We explored triviality of cobordism classes and anomaly cancellation in supergravity theories in d > 6, leading to the existence of defects called I-folds. The compactification conditions to lower dimensions with these defects being anomaly-free impose restrictions on higher dimensional theories, particularly on the allowed rank of gauge groups. These restrictions explain observed limitations in string theory constructions, with the solutions in eight and nine dimensions matching string theory compactifications.Constraints on the global structure of the gauge group in eight and nine dimensions were also derived using these techniques.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Bernardo Fraiman et al.
Summary: Using a moduli space exploration algorithm, the study produces a complete list of maximally enhanced gauge groups realized in the heterotic string in 7d. This includes the usual Narain component and five other components with rank reduction via nontrivial holonomy triples. By employing lattice embedding techniques, an explicit match with the mechanism of singularity freezing in M-theory on K3 is found, with complete global data for each gauge group explicitly given.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Anamaria Font et al.
Summary: This study focuses on compactifications of the heterotic string on special T-d/Z(2) orbifolds, revealing properties of string models and gauge groups; systematic exploration of the moduli space using computer algorithms, identifying points where the U(1)(d+8) enhances to a non-Abelian gauge group; findings on group structures in specific dimensions.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Yuta Hamada et al.
Summary: By studying consistency conditions on worldvolume theory of 3-brane probes, we strengthen Swampland constraints on 8d supergravity theories, leading to strict restrictions on compact internal geometry, gauge algebra, and higher derivative terms. These results provide further evidence for the string lamppost principle in 8d with 16 supercharges.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Review
Astronomy & Astrophysics
Mariana Grana et al.
Summary: The swampland theory consists of low-energy effective field theories that cannot be consistently coupled to quantum gravity. Effective theories should have certain conjectural properties to avoid falling into the swampland. These theories have diverse applications in particle physics, making predictions on neutrino masses, the cosmological constant, electroweak and QCD scales, among others.
Article
Physics, Particles & Fields
Anamaria Font et al.
JOURNAL OF HIGH ENERGY PHYSICS
(2020)
Review
Physics, Multidisciplinary
Eran Palti
FORTSCHRITTE DER PHYSIK-PROGRESS OF PHYSICS
(2019)
Article
Physics, Particles & Fields
Bernardo Fraiman et al.
JOURNAL OF HIGH ENERGY PHYSICS
(2018)
Article
Physics, Particles & Fields
Hirosi Ooguri et al.
