A note on Inflation and the Swampland
Alex Kehagias,Antonio Riotto +1 more
TLDR
In this article, it was shown that there is no tension between the swampland criteria and the current lower bound on the tensor-to-scalar ratio.Abstract:
We provide some comments about the constraints on the inflationary models inferred from the two Swampland criteria which have been recently proposed. In particular we argue that, in the absence of any knowledge about the origin of the adiabatic curvature perturbations, within the slow-roll single field models of inflation there is no tension between the swampland criteria and the current lower bound on the tensor-to-scalar ratio.read more
Citations
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The Swampland: Introduction and Review
TL;DR: The Swampland program aims to distinguish effective theories which can be completed into quantum gravity in the ultraviolet from those which cannot as mentioned in this paper, assuming only a knowledge of quantum field theory and general relativity.
Journal ArticleDOI
The Swampland: Introduction and Review
TL;DR: The Swampland program aims to distinguish effective theories which can be completed into quantum gravity in the ultraviolet from those which cannot as mentioned in this paper, assuming only a knowledge of quantum field theory and general relativity.
Journal ArticleDOI
New physics in light of the $H_0$ tension: an alternative view
TL;DR: In this paper, the authors consider an alternative viewpoint: what happens if a physical theory is able to fix the extra parameters to a specific set of nonstandard values, in this case the degrees of freedom of the model are reduced with respect to the standard case where the additional parameters are free to vary.
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The zoo plot meets the swampland: mutual (in)consistency of single-field inflation, string conjectures, and cosmological data
William H. Kinney,William H. Kinney,Sunny Vagnozzi,Sunny Vagnozzi,Luca Visinelli,Luca Visinelli,Luca Visinelli +6 more
TL;DR: In this paper, the authors consider single-field inflation in light of string-motivated "swampland" conjectures suggesting that effective scalar field theories with a consistent UV completion must have field excursion, in combination with a sufficiently steep potential.
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Warm inflation as a way out of the swampland
TL;DR: In this article, the authors discuss how dissipative effects and the presence of a thermal radiation bath, which are inherent characteristics of the warm inflation dynamics, can evade the recently proposed swampland conjectures.
References
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Journal ArticleDOI
Inflationary universe: A possible solution to the horizon and flatness problems
TL;DR: In this paper, the authors proposed a model of hot big-bang cosmology where the early universe is assumed to be highly homogeneous, in spite of the fact that separated regions were causally disconnected (horizon problem).
Journal ArticleDOI
Particle physics models of inflation and the cosmological density perturbation
David H. Lyth,Antonio Riotto +1 more
TL;DR: A review of particle-theory models of inflation, and their predictions for the primordial density perturbation that is thought to be the origin of structure in the Universe is given in this paper.
Journal ArticleDOI
Spontaneous Creation of Almost Scale - Free Density Perturbations in an Inflationary Universe
TL;DR: In this paper, the creation and evolution of energy-density perturbations are analyzed for the new inflationary universe scenario proposed by Linde, and Albrecht and Steinhardt.
Journal Article
Quantum Fluctuations and a Nonsingular Universe
TL;DR: In this paper, it was shown that over a finite time, quantum fluctuations of the curvature disrupt the nonsingular cosmological solution corresponding to a universe with a polarized vacuum.
Journal ArticleDOI
The String landscape, black holes and gravity as the weakest force
TL;DR: In this paper, an upper bound on the strength of gravity relative to gauge forces in quantum gravity was given, motivated by arguments involving holography and absence of remnants, the stability of black holes as well as the non-existence of global symmetries in string theory.