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Article
Astronomy & Astrophysics
Salvatore Raucci
Summary: We introduce two novel types of vacua for ten-dimensional string models devoid of supersymmetry, wherein dilaton potentials are nullified by continuous electric or magnetic fields. These vacua result from alpha' corrections to the equations of motion and the limitations of this expansion are analyzed. Specifically, we identify explicitly unstable singlet scalar perturbations in orientifold vacua and argue that both cases experience additional instabilities induced by non-abelian couplings.
Article
Physics, Particles & Fields
David Martin Velazquez et al.
Summary: In this work, an attempt is made to reconcile the Ricci flow conjecture and the Cobordism conjecture, which are refinements of the Swampland distance conjecture and the No global symmetries conjecture respectively. The approach involves applying surgery techniques to Ricci flow singularities and introducing appropriate defects to trivialize the cobordism class of one of the resulting connected components. The specific example of Omega(SO)(4) is studied in detail, and the connection between blowing up a point of a manifold and taking the connected sum with CPn is explored. The problem of studying the Ricci flow of a K3 whose cobordism class is trivialized by the addition of 16 copies of CP2 is addressed using the techniques developed in the previous sections and the classification of singularities in terms of ADE groups.
JOURNAL OF HIGH ENERGY PHYSICS
(2023)
Article
Physics, Particles & Fields
Ralph Blumenhagen et al.
Summary: It is proposed that cobordism and K-theory groups, which can be mathematically related, are associated to higher-form symmetries in physics. This idea is supported by showing that cobordism and K-theory groups of a general manifold X reproduce the expected symmetries from dimensional reduction of the theory on X. Atiyah-Hirzebruch spectral sequence is used to compute such groups for common choices of X in string compactifications.
JOURNAL OF HIGH ENERGY PHYSICS
(2023)
Article
Astronomy & Astrophysics
Markus Dierigl et al.
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
Physics, Multidisciplinary
Arun Debray et al.
Summary: This paper explores the quantum anomalies in Type IIB supergravity, finding that they can be cancelled through subtle modifications of the standard 10d Chern-Simons term or via a topological analog of the Green-Schwarz mechanism. These alternative IIB theories share the same low energy supergravity limit as the standard theory but have a different spectrum of extended objects.
FORTSCHRITTE DER PHYSIK-PROGRESS OF PHYSICS
(2022)
Article
Physics, Particles & Fields
Seung-Joo Lee et al.
Summary: This study systematically analyzes the weak coupling limits of 2-form tensor fields in the presence of gravity, aiming to test the Weak Gravity and Swampland Distance Conjectures and explore the phenomenon of emergence. By considering the weak coupling limits of F-theory and Type IIB strings in different compactifications, the role and dual relations of asymptotically tensionless strings in the moduli space are identified, as well as the emergence of extra dimensions in M-theory compactifications.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
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
Salvatore Raucci
Summary: This paper investigates codimension-one vacua arising from low energy effective actions inspired by string theory, with a focus on their consistency when localized sources are allowed in the equations of motion. By drawing inspiration from specific models, the authors explore the singularities associated with these investigations and discuss analogies with non-supersymmetric models.
Article
Physics, Particles & Fields
Muldrow Etheredge et al.
Summary: The paper focuses on the issue of infinite distances in field space in quantum gravity theory and proposes a lower bound for the lightest tower. Through examples and discussions on related conjectures, the proposal for the bound is supported. Conclusions about scalar field potentials and cosmological expansion are also drawn.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Particles & Fields
Ralph Blumenhagen et al.
Summary: This paper discusses the importance of non-trivial K-theory groups and non-trivial cobordism groups in relation to global symmetries, which are conjectured to be absent in quantum gravity. The authors propose a correspondence between the two groups, inspired by open-closed string duality, which can be seen as a physical manifestation of a generalisation of the classic Conner-Floyd isomorphism. The relationships between KO-groups and Spin-cobordisms, as well as between K-groups and Spin(c)-cobordisms, are exemplified. The authors suggest that global symmetries related by such an isomorphism are typically gauged. Additionally, the paper explores the implications of combining non-torsion K-theory and cobordism groups, including recovering tadpole cancellation conditions from type I string theory and F-theory, as well as the possibilities opened up by torsion charges.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Particles & Fields
Roberta Angius et al.
Summary: The study investigates the dynamical realization of the Cobordism Conjecture, which involves Einstein gravity coupled to scalars containing end-of-the-world branes. The solutions near the branes are described by a critical exponent and exhibit universal scaling relations. This work provides insights into the topology of quantum gravity configurations.
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
Roberta Angius et al.
Summary: The paper discusses the timelike linear dilaton backgrounds in supercritical string theories as time-dependent Dynamical Cobordisms in string theory, with spacelike singularities serving as boundaries defining the beginning of time. It proposes a microscopic interpretation corresponding to closed tachyon condensation in a strong coupling scenario, and argues that this beginning of time is closely related to bubbles of nothing obtained through lightlike tachyon condensation in weakly coupled backgrounds.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Particles & Fields
Ralph Blumenhagen et al.
Summary: We studied the dynamical cobordism induced by the backreaction of a non-supersymmetric, positive tension domain wall in string theory, and provided evidence for a new kind of non-isotropic solution related to this.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Astronomy & Astrophysics
Ivano Basile et al.
Summary: Researchers have discovered in the framework of ten-dimensional superstring theories that spacetime supersymmetry can be broken at the string scale by controlling Minkowski backgrounds. They have proposed a new background model involving a warped compactification on an interval associated with codimension-one defects. By varying the effective field theory parameters, they have generalized these solutions and discussed the dimensional reduction on the interval. They have found that in a certain range of dimensions, scalars and form fields decouple, resulting in an Einstein-Yang-Mills theory. Additionally, the breakdown of this effective description due to the presence of light Kaluza-Klein modes supports the consistency of the swampland distance conjecture.
Article
Physics, Multidisciplinary
David Andriot et al.
Summary: This article investigates the cobordism conjecture of the swampland program in both mathematical and physical aspects. It discusses the role of topological structures, geometric structures, magnetic defects, and Kaluza-Klein monopoles in the conjecture, and studies the gravity decoupling limit and NSNS string backgrounds.
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
J. Mourad et al.
Summary: The effects of the leading tadpole potentials of 10D tachyon-free non-supersymmetric strings in warped products of flat geometries were investigated. Different families of vacua and types of vacua were identified, with detailed discussions on including symmetric fluxes and different asymptotic behaviors. The study also touched upon corresponding cosmologies and the possibility of toroidal dimensions contracting during cosmological expansion.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Ginevra Buratti et al.
Summary: The study explores spacetime-dependent solutions to string theory models with dynamical field sources, revealing new scaling relations relevant to the Cobordism and Swampland Distance Conjectures, and demonstrates that walls where scalars remain at finite distance in moduli space correspond to domain walls separating different theories/vacua.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Review
Physics, Multidisciplinary
Ivano Basile
Summary: This article reviews the dramatic consequences of supersymmetry breaking on string vacua, focusing on vacuum stability in the context of ten-dimensional string models. Various vacuum solutions are presented, along with an analysis of classical and quantum stability, as well as implications for brane dynamics and potential future developments.
RIVISTA DEL NUOVO CIMENTO
(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)
Article
Physics, Particles & Fields
Ginevra Buratti et al.
Summary: This study focuses on string theory vacua with dynamical fields and explores the universal features of the resulting spacetime-dependent solutions. It suggests that these solutions can only extend a finite distance in spacetime dimensions where fields vary, and replaces naive singularities with spacetime ends related to the cobordism defects of the swampland cobordism conjecture involving stringy ingredients.
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
Astronomy & Astrophysics
Markus Dierigl et al.
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
Physics, Particles & Fields
Alek Bedroya et al.
JOURNAL OF HIGH ENERGY PHYSICS
(2020)
Article
Physics, Particles & Fields
Inaki Garcia Etxebarria et al.
JOURNAL OF HIGH ENERGY PHYSICS
(2020)
Review
Physics, Multidisciplinary
Eran Palti
FORTSCHRITTE DER PHYSIK-PROGRESS OF PHYSICS
(2019)
Article
Astronomy & Astrophysics
Dieter Luest et al.
Article
Physics, Particles & Fields
Riccardo Antonelli et al.
JOURNAL OF HIGH ENERGY PHYSICS
(2019)
Article
Astronomy & Astrophysics
Tom Banks et al.
Article
Astronomy & Astrophysics
E. Dudas et al.
Article
Physics, Particles & Fields
Hirosi Ooguri et al.
Article
Physics, Particles & Fields
R Blumenhagen et al.
Article
Astronomy & Astrophysics
E Dudas et al.
