Article
Physics, Multidisciplinary
J. Sadeghi, S. Noori Gashti, M. R. Alipour
Summary: In this paper, we challenge some inflationary models using the recent new conjecture of the swampland program, further refining the de Sitter swampland conjecture. We find that some inflation models are in line with this conjecture, while others are in direct tension with it. By proposing a modified model, we address the limitation on constant parameters. Through analyzing multiple inflation models, we conclude that many models are fully compatible with the mentioned conjecture.
CHINESE JOURNAL OF PHYSICS
(2022)
Article
Physics, Particles & Fields
Yang Liu
Summary: The study examines if the Higgs inflation model and its variations can satisfy the further refining de Sitter swampland conjecture by adjusting relevant parameters, based on observational data. The results indicate that these inflationary models might all be in landscape if the further refining de Sitter swampland conjecture holds.
EUROPEAN PHYSICAL JOURNAL C
(2021)
Article
Physics, Particles & Fields
Jureeporn Yuennan, Phongpichit Channuie
Summary: The study explores various inflation models and whether they can satisfy the refined de Sitter swampland conjecture, finding that some models are in tension with the conjecture but all can satisfy the alternative refined de Sitter conjecture.
Article
Physics, Particles & Fields
J. Sadeghi, B. Pourhassan, S. Noori Gashti, I. Sakalli, M. R. Alipour
Summary: In this paper, a particular type of inflation is studied using non-local Friedman equations derived from string field theory. The model is challenged by refining the de Sitter swampland conjecture. The results show that the inflationary model is strongly in tension with the conjecture.
EUROPEAN PHYSICAL JOURNAL C
(2023)
Article
Astronomy & Astrophysics
Ida M. Rasulian, Mahdi Torabian, Liliana Velasco-Sevilla
Summary: Research has shown that a toy de Sitter no-scale supergravity model can be consistent with the refined de Sitter conjecture and the trans-Planckian censorship conjecture for specific parameter choices, and by adding rolling dynamics, the theory can become stable along the imaginary direction. Extending the model to multifield rolling and de Sitter fields has revealed the parameter space where they can be compatible with the refined de Sitter conjecture.
Article
Astronomy & Astrophysics
Taiga Harada, Yu Nakayama
Summary: Recent studies on swampland conjectures suggest that the lightest neutrino must be Dirac and have a cosmologically small mass. These conjectures also indicate that the accompanying U(1) symmetry must be broken down to Z(4), Z(8), or Z(10). These findings provide evidence for the absence of continuous global symmetry in quantum gravity.
MODERN PHYSICS LETTERS A
(2022)
Article
Astronomy & Astrophysics
S. Noori Gashti, J. Sadeghi, M. R. Alipour
Summary: This paper investigates mimetic gravity analysis in various types of general relativity extensions. The study focuses on mimetic f(G) gravity and its combination with the swampland dS conjectures to understand cosmic inflation. The results are analyzed and evaluated, including the calculation of cosmological parameters and the examination of the compatibility with observable data.
INTERNATIONAL JOURNAL OF MODERN PHYSICS D
(2023)
Article
Physics, Multidisciplinary
Jureeporn Yuennan, Phongpichit Channuie
Summary: This article discusses a new refined de Sitter conjecture and investigates three different inflation models. By selecting appropriate parameters, it is found that all three models can satisfy this new conjecture.
FORTSCHRITTE DER PHYSIK-PROGRESS OF PHYSICS
(2022)
Article
Physics, Particles & Fields
Rashmish K. K. Mishra
Summary: This study examines the relationship between the confinement scale lambda(c) and the Hubble scale H in a holographic theory, in order to satisfy the Festina Lente criteria from swampland principles. It is found that a purely gravitational description leads to an unstable de Sitter extremum, whereas the inclusion of a scalar sector allows for metastable de Sitter minima. The requirements of Festina Lente impose constraints on the parameters, but the de Sitter minimum is found to be close to decay in some parameter range. The results support the consistency and utility of the Karch-Randall setup and establish connections between Festina Lente and other swampland conjectures.
JOURNAL OF HIGH ENERGY PHYSICS
(2023)
Article
Astronomy & Astrophysics
Orfeu Bertolami, Paulo M. Sa
Summary: Multi-field cold inflation models are usually at odds with the swampland conjectures in string theory, but can be reconciled in the strong dissipative regime of warm inflation.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
Orfeu Bertolami, Claudio Gomes, Paulo M. Sa
Summary: In this paper, we investigate whether inflationary solutions driven by a single scalar field can be consistent with the swampland conjectures in string theory, in the context of alternative theories of gravity with nonminimal coupling between matter and curvature. Our findings suggest that the slow-roll conditions are not compatible with the swampland conjectures for a vast range of inflationary solutions in these alternative theories of gravity.
Article
Astronomy & Astrophysics
Ugur Atli, Omer Guleryuz
Summary: This study introduces a bounded de Sitter conjecture for single-field slow-roll inflation theory, incorporating the concepts of supergravity methods, Kahler kinetic terms, and single-field slow-roll inflation parameters.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Physics, Particles & Fields
Daniel Junghans
Summary: We argue that dS vacua in the LARGE-volume scenario of type IIB string theory can be affected by various curvature, warping, and gs corrections. Our analysis reveals that these corrections can be larger than anticipated, with some appearing without any suppression at all. We also demonstrate that it is not possible to make all corrections small simultaneously in a model with positive vacuum energy. Some of the corrections discussed are also relevant for the stability of non-supersymmetric AdS vacua.
Article
Physics, Particles & Fields
Min-Seok Seo
Summary: The Cohen-Kaplan-Nelson (CKN) bound formulates the condition that black holes are not produced by the dynamics of low energy effective field theory. In de Sitter space, it also constrains the maximum size of matter distribution to be smaller than the cosmological horizon determined by black holes. On the other hand, the swampland distance conjecture (SDC) predicts that de Sitter space becomes unstable due to the descent of low energy degrees of freedom from UV. This leads to a rapid increase in the energy inside the cosmological horizon, which can be constrained by the CKN bound.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Article
Physics, Particles & Fields
Ralph Blumenhagen, Christian Kneissl, Andriana Makridou
Summary: Under certain assumptions, the quantum break time approach and the trans-Planckian censorship conjecture both result in de Sitter swampland constraints of the same functional form. By analyzing the consequences of quantum breaking, we find that there are implications for the thermal matter component and recover the no eternal inflation bound in the low temperature regime. Additionally, the stronger bound from the dS swampland conjecture can be obtained under reasonable assumptions about the high-temperature regime of string theory.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Niccolo Cribiori, Renata Kallosh, Andrei Linde, Christoph Roupec
JOURNAL OF HIGH ENERGY PHYSICS
(2020)
Article
Physics, Particles & Fields
David Andriot, Alan Cornell, Aldo Deandrea, Fabio Dogliotti, Dimitrios Tsimpis
JOURNAL OF HIGH ENERGY PHYSICS
(2020)
Article
Physics, Particles & Fields
David Andriot, Dimitrios Tsimpis
JOURNAL OF HIGH ENERGY PHYSICS
(2020)
Article
Physics, Particles & Fields
David Andriot, Niccolo Cribiori, David Erkinger
JOURNAL OF HIGH ENERGY PHYSICS
(2020)
Article
Physics, Particles & Fields
Niccolo Cribiori, Christoph Roupec, Magnus Tournoy, Antoine Van Proeyen, Timm Wrase
JOURNAL OF HIGH ENERGY PHYSICS
(2020)
Article
Physics, Particles & Fields
David Andriot, Paul Marconnet, Timm Wrase
JOURNAL OF HIGH ENERGY PHYSICS
(2020)
Article
Astronomy & Astrophysics
David Andriot, Paul Marconnet, Timm Wrase
Summary: This article discusses two newly discovered 10-dimensional supergravity de Sitter solutions and analyzes whether they can be promoted to classical string backgrounds. Despite some positive partial results, both solutions ultimately fail to simultaneously fulfill all requirements. The analysis emphasizes various subtleties and discusses the relation to the problem of scale separation.
Article
Physics, Multidisciplinary
David Andriot
Summary: This study focuses on de Sitter solutions of 10d type II supergravities, revealing that all known examples are unstable but indicating the existence of various different tachyons and related bounds on eta(V). By developing three methods, the researchers find 10 new de Sitter solutions, with one appearing to be stable in non-compact extra dimensions.
FORTSCHRITTE DER PHYSIK-PROGRESS OF PHYSICS
(2021)
Article
Physics, Particles & Fields
David Andriot, Ludwig Horer, Paul Marconnet
Summary: In this paper, we classify and study certain supergravity solutions with different spacetime properties. Using new numerical tools, we discover previously unexplored solutions and analyze their properties and stability. We propose a new conjecture regarding the existence of a flat direction.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Particles & Fields
David Andriot, Ludwig Horer, Paul Marconnet
Summary: This paper classifies solutions of 10-dimensional type IIA/B supergravity theories with orientifolds on a 4-dimensional maximally symmetric spacetime multiplied by a 6-dimensional group manifold. It explores previously unexplored solution classes and discovers new solutions including (anti-) de Sitter solutions with intersecting O-4, O-6 and O-6, and Minkowski solutions with 3 intersecting O-5. The paper also presents new no-go theorems against (anti-) de Sitter solutions and conjectures the absence of de Sitter solutions for 2 or less intersecting source sets, indicating that a 4-dimensional effective theory with de Sitter solutions is at most N = 1 supersymmetric.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Correction
Physics, Particles & Fields
David Andriot, Ludwig Horer, Paul Marconnet
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Particles & Fields
David Andriot, Ludwig Horer
Summary: In this work, the existence of string theory solutions with a d-dimensional (quasi-) de Sitter spacetime, for 3 <= d <= 10, is investigated. No-go theorems valid for general d are derived through classical compactifications. These theorems are used to exclude (quasi-) de Sitter solutions for d >= 7, and it is found unlikely for d = 6, 5 as well. Parameter c of the swampland de Sitter conjecture, M-p |del V |/V >= c, is computed for each no-go theorem. The TCC bound c >= 2/root(d-1)(d-2) is perfectly satisfied for d >= 4, but violated in d = 3. Related proposals in the literature, including the swampland distance conjecture, decay rate, and accelerated expansion bound, are also discussed.
JOURNAL OF HIGH ENERGY PHYSICS
(2023)
Article
Physics, Particles & Fields
David Andriot, Paul Marconnet, Muthusamy Rajaguru, Timm Wrase
Summary: Classical flux compactifications are an important research field in string theory, providing a testing ground for various conjectures. This paper focuses on type II supergravity compactifications on 6d group manifolds towards 4d maximally symmetric spacetimes, and develops a code for automated calculations and analysis.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Particles & Fields
David Andriot, Ludwig Horer, George Tringas
Summary: In this paper, we characterize negative scalar potentials, V < 0, in d-dimensional effective theories of quantum gravity through the Anti-Trans-Planckian Censorship Conjecture (ATCC) inspired by a refined version of the TCC. The ATCC is based on the fact that sub-Planckian length modes violate the validity of the effective theory in a contracting universe. In the asymptotics of field space, we find that -V'/V >= c(0) when V' >= 0. We also derive a new asymptotic condition, V''/V >= c(0)(2), and infer the existence of a scalar with mass satisfying m(2)l(2) less than or similar to -2 in anti-de Sitter solutions.
JOURNAL OF HIGH ENERGY PHYSICS
(2023)
Article
Astronomy & Astrophysics
Niccolo Cribiori, Renata Kallosh, Andrei Linde, Christoph Roupec