Article
Astronomy & Astrophysics
Tom Rudelius
Summary: Constraints on scalar field potentials and light massive states in asymptotic limits of scalar field space are correlated with defining asymptotic observables in expanding cosmologies, which could shed light on the swampland program and the weak gravity conjecture in cosmology.
Article
Physics, Multidisciplinary
Yuta Hamada, Miguel Montero, Cumrun Vafa, Irene Valenzuela
Summary: This paper explores certain swampland criteria from the perspective of the finiteness of black hole entropy and suggests that these criteria may fundamentally result from the finiteness of quantum gravity amplitudes.
JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL
(2022)
Article
Physics, Multidisciplinary
Edward W. Kolb, Andrew J. Long, Evan McDonough
Summary: The gravitino swampland conjecture expands the scope of effective field theories, proposing that the gravitino sound speed must be nonvanishing. This conjecture has important implications for both theories and observations, and is supported by scenarios for moduli stabilization in string theory.
PHYSICAL REVIEW LETTERS
(2021)
Article
Astronomy & Astrophysics
Pramod Shukla
Summary: Research shows that achieving de Sitter solutions in some nongeometric flux compactification models is challenging, as the Bianchi identities limit the NS-NS three-form flux and nongeometric flux from simultaneously taking non-zero values.
Article
Astronomy & Astrophysics
Luis A. Anchordoqui, Ignatios Antoniadis, Dieter Luest, Jorge F. Soriano
Summary: The swampland de Sitter conjecture, combined with upper limits on the tensor-to-scalar ratio r derived from observations of the cosmic microwave background, challenges the paradigm of slow-roll single-field inflation. By reexamining single-field inflationary potentials with S-duality symmetry and computing r at next-to-leading order, it is found that certain values of c and c' can accommodate experimental constraints. Further restrictions are imposed by requiring a minimum number of e-folds of inflation and an effective field theory description valid only over a certain field displacement in the target space geometry.
Article
Astronomy & Astrophysics
Heliudson Bernardo, Suddhasattwa Brahma, Keshav Dasgupta, Radu Tatar
Summary: This paper examines the anti-dc Sitter vacua corresponding to solutions arising from purely nonperturbative contributions to the superpotential, showing that these solutions satisfy the weak gravity conjecture and the AdS-moduli scale separation conjecture without specific parameter fine-tuning. Additionally, the paper outlines the advantages of these solutions over other constructions.
Article
Astronomy & Astrophysics
Ioannis Dalianis, Fotis Farakos, Alex Kehagias
Summary: We observe the conflict between the typical gauge mediation of supersymmetry breaking and the global limit of the festina lente swampland bound. The viable alternatives include decoupling mediation/breaking schemes along with gravity, such as gravity mediation, with some highlighted phenomenological properties. On the other hand, gauge mediation remains a possible mechanism only in models where supersymmetry is restored in the global limit, such as in no-scale supergravity.
Article
Astronomy & Astrophysics
Callum R. Brodie, Andrei Constantin, Andre Lukas, Fabian Ruehle
Summary: The text discusses the swampland conjectures for M-theory compactified on Calabi-Yau threefolds and the situations where the moduli space has infinite discrete symmetry in cases involving a finite number of isomorphism classes of manifolds, as well as the scenario of infinite flop chains. The resolution of contradictions is achieved by dividing by this discrete symmetry.
Article
Astronomy & Astrophysics
Evan McDonough, Meng-Xiang Lin, J. Colin Hill, Wayne Hu, Shengjia Zhou
Summary: This article examines the relationship between the early dark energy model, the swampland distance conjecture, and cosmological parameters. A new version of the early dark energy model, called the early dark sector model, is proposed to address tensions with large-scale structure data. The model exhibits new phenomena in both the early and late Universe and partially resolves the tension. However, constraints on the model's parameters are still present. Additional constraints from the Atacama Cosmology Telescope data suggest a conflict with the swampland distance conjecture.
Article
Astronomy & Astrophysics
Luis A. Anchordoqui, Ignatios Antoniadis, Dieter Lust, Jorge F. Soriano
Summary: The existence of dark energy imposes strict constraints on effective field theories that satisfy the Swampland conjectures, which is crucial for string model building.
Article
Physics, Multidisciplinary
Oem Trivedi
Summary: Research has shown that single-field inflation models in a cosmology based on general relativity are in conflict with the swampland conjectures from string theory. However, it has been discovered that these models can still be consistent in certain non-trivial inflationary regimes. By considering a specific type of Lorentz violating inflationary scenario, the researchers demonstrate that the tensions between the swampland conjectures and inflation can be resolved in a general relativity-based cosmology.
EUROPEAN PHYSICAL JOURNAL PLUS
(2022)
Article
Physics, Particles & Fields
Weijie Jin, Robert Brandenberger, Lavinia Heisenberg
Summary: It is found in the study that the evolution of the inflaton field in the axion monodromy model is affected by particle production, and the resulting dynamics may be consistent with the swampland constraints. The effects on the inflaton dynamics can be negligible when the field spacing between local minima of the modulated potential is large, while the production of inflaton fields from modulated fields can lead to trapped inflation consistent with the swampland constraints with sufficiently large coupling.
EUROPEAN PHYSICAL JOURNAL C
(2021)
Article
Astronomy & Astrophysics
Julian Freigang, Dieter Luest, Guo-En Nian, Marco Scalisi
Summary: This study examines the validity of the Swampland Distance Conjecture on prototype geometries of infinite distance limits of Calabi-Yau compactifications and finds that field trajectories leading to cosmic acceleration and featuring rapid turns near the boundary of the moduli space exist in the Swampland. This has significant implications for the realization and consistency of multi-field scenarios in string theory.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2023)
Article
Physics, Particles & Fields
F. B. M. dos Santos, R. Silva, S. Santos da Costa, M. Benetti, J. S. Alcaniz
Summary: We investigate a warm inflation scenario driven by the beta-exponential potential and study its theoretical and observational aspects. The decay of the inflaton field into radiation during inflationary phase is considered. We find that inflation in agreement with current cosmic microwave background data can be realized in both weak and strong dissipation regimes. The model of warm inflation in the strong dissipation regime is also found to satisfy the swampland conjectures.
EUROPEAN PHYSICAL JOURNAL C
(2023)
Article
Astronomy & Astrophysics
A. Banerjee, H. Cai, L. Heisenberg, E. O. Colgain, M. M. Sheikh-Jabbari, T. Yang
Summary: Local determinations of the Hubble constant H-0 based on low redshift data favor quintessence models that lower H-0 relative to Lambda CDM. Additionally, results show that an exponential coupling to dark matter cannot alter this conclusion in the same redshift range. This leaves open the possibility that a coupling in the matter-dominated epoch, potentially even in the dark ages, may yet save H-0 from sinking in the string theory swampland.
Article
Physics, Particles & Fields
Stefan Blesneag, Evgeny I. Buchbinder, Andrei Constantin, Andre Lukas, Eran Palti
JOURNAL OF HIGH ENERGY PHYSICS
(2018)
Article
Physics, Multidisciplinary
Daniel Klaewer, Dieter Luest, Eran Palti
FORTSCHRITTE DER PHYSIK-PROGRESS OF PHYSICS
(2019)
Article
Astronomy & Astrophysics
Hirosi Ooguri, Eran Palti, Gary Shiu, Cumrun Vafa
Article
Physics, Particles & Fields
Thomas W. Grimm, Chongchuo Li, Eran Palti
JOURNAL OF HIGH ENERGY PHYSICS
(2019)
Review
Physics, Multidisciplinary
Eran Palti
FORTSCHRITTE DER PHYSIK-PROGRESS OF PHYSICS
(2019)
Article
Astronomy & Astrophysics
Dieter Luest, Eran Palti, Cumrun Vafa
Article
Astronomy & Astrophysics
Dieter Luest, Eran Palti
Article
Physics, Particles & Fields
Eran Palti, Cumrun Vafa, Timo Weigand
JOURNAL OF HIGH ENERGY PHYSICS
(2020)
Article
Physics, Particles & Fields
Fernando Marchesano, Eran Palti, Joan Quirant, Alessandro Tomasiello
JOURNAL OF HIGH ENERGY PHYSICS
(2020)
Article
Physics, Particles & Fields
Eran Palti
Summary: The study reveals a certain classification of BPS stability that is partially independent of the value of gauge couplings, and mathematically formulates this stability in terms of a limiting mixed Hodge structure associated with the vanishing coupling limit. The implications of the results for the Swampland program, aiming to understand weak-coupling limits, are also examined, particularly regarding the nature and presence of an infinite tower of light charged BPS states.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Multidisciplinary
Eran Palti
Summary: The Swampland programme challenges the traditional assumption that quantum gravitational physics is not important at larger distance scales, proposing that certain features of quantum gravity can still remain. Evidence for these features mostly comes from string theory, and theories that do not exhibit them are considered inconsistent with quantum gravity.
CONTEMPORARY PHYSICS
(2021)
Article
Physics, Particles & Fields
Eran Palti, Adar Sharon
Summary: Motivated by the Weak Gravity Conjecture, this paper investigates the convexity properties of operators charged under global symmetries in CFTs. It proposes that in multi-dimensional charge space, the convex directions should generate a sub-lattice with an index that is not parametrically large. The paper presents proof for the special case of two-dimensional CFTs, where the index can be made parametrically large. However, it also shows that in two dimensions, there always exist convex directions generating a sub-lattice with an index bounded by the current levels of the global symmetry. In more than two dimensions, the index of the sub-lattice generated by marginally convex charge vectors associated to BPS operators can be made parametrically large, but there is no evidence for parametric delay in convexity once all operators are considered.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Particles & Fields
Stefano Andriolo, Marco Michel, Eran Palti
Summary: The Positive Binding Conjecture proposes that in a consistent gravitational theory in Anti de-Sitter (AdS) space, there must exist a charged particle with non-negative self-binding energy. This conjecture is shown to hold true in AdS(4) and AdS(5), where the coupling to an additional scalar field is considered. The contribution of the scalar field to the binding energy is significant, making it an essential component of the conjecture. Analytic expressions are given for the self-binding energy in certain cases, while numerical expressions are provided for other masses of the scalar field.
JOURNAL OF HIGH ENERGY PHYSICS
(2023)
Article
Astronomy & Astrophysics
Ofer Aharony, Eran Palti
Summary: The study proposes a new approach to the weak gravity conjecture and attempts to compare it with conformal field theory. They found that in all tested examples, the conjecture seems to hold true, but they have not yet been able to understand why this is the case from the perspective of conformal field theory.
Article
Astronomy & Astrophysics
Nelson R. F. Braga, Octavio C. Junqueira
Summary: This study investigates the influence of rotation on the transition temperature of strongly interacting matter produced in non-central heavy ion collisions. By using a holographic description of an AdS black hole, the authors extend the analysis to the more realistic case where the matter spreads over a region around the rotational axis. The results show the coexistence of confined and deconfined phases and are consistent with the concept of local temperature in rotating frames developed by Tolman and Ehrenfest.
Article
Astronomy & Astrophysics
Bing Sun, Jiachen An, Zhoujian Cao
Summary: This paper investigates the effect of gravitational constant variation on the propagation of gravitational waves. By employing two analytical methods, the study finds that variations in the gravitational constant result in amplitude and phase corrections for gravitational waves, and the time variation of the gravitational constant can be constrained through the propagation of gravitational waves.
Article
Astronomy & Astrophysics
Abdellah Touati, Zaim Slimane
Summary: This letter presents the first study of Hawking radiation as a tunneling process within the framework of non-commutative gauge theory of gravity. The non-commutative Schwarzschild black hole is reconstructed using the Seiberg-Witten map and the star product. The emission spectrum of outgoing massless particles is computed using the quantum tunneling mechanism. The results reveal pure thermal radiation in the low-frequency scenario, but a deviation from pure thermal radiation in the high-frequency scenario due to energy conservation. It is also found that noncommutativity enhances the correlations between successively emitted particles.
Article
Astronomy & Astrophysics
Shahar Hod
Summary: The travel times of light signals between two antipodal points on a compact star's surface are calculated for two different trajectories. It is shown that, for highly dense stars, the longer trajectory along the surface may have a shorter travel time as measured by asymptotic observers. A critical value of the dimensionless density-area parameter is determined for constant density stars to distinguish cases where crossing through the star's center or following a semi-circular trajectory on the surface has a shorter travel time as measured by asymptotic observers.
