Results 11 to 20 of about 20,804,533 (246)
Multi-Field versus Single-Field in the Supergravity Models of Inflation and Primordial Black Holes
Universe, 2021 We review the models unifying inflation and Primordial Black Hole (PBH) formation, which are based on the modified (Starobinsky-type) supergravity. We begin with the basic (Starobinsky) inflationary model of modified gravity and its alpha-attractor-type ...
Sergei V. Ketov
doaj +2 more sources
On sgoldstino-less supergravity models of inflation [PDF]
Journal of High Energy Physics, 2014 We go a step further in the search for a consistent and realistic supergravity model of large-field inflation by building a class of models with the following features: during slow-roll, all the scalar fields other than the inflaton are frozen by large inflaton-dependent masses or removed from the spectrum; at the end of inflation, supersymmetry is ...
Fabio Zwirner +2 more
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Building models of inflation in no-scale supergravity [PDF]
International Journal of Modern Physics D, 2020 After reviewing the motivations for cosmological inflation formulated in the formalism of supersymmetry, we argue that the appropriate framework is that of no-scale supergravity. We then show how to construct within this framework inflationary models whose predictions for the tilt in the spectrum of scalar perturbations, [Formula: see text], and the ...
Natsumi Nagata +9 more
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On the topology of the inflaton field in minimal supergravity models [PDF]
Journal of High Energy Physics, 2014 We consider global issues in minimal supergravity models where a single field inflaton potential emerges. In a particular case we reproduce the Starobinsky model and its description dual to a certain formulation of R+R^2 supergravity. For definiteness we confine our analysis to spaces at constant curvature, either vanishing or negative.
Pietro Fré +3 more
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Old-minimal supergravity models of inflation [PDF]
Journal of High Energy Physics, 2013 LaTeX, 24 pages, no pictures; Sections 3 and 4 expanded, references added, typos ...
Takahiro Terada +3 more
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KK Compactification of Supergravity Models
Fundamental Theories of Physics, 2019 In this chapter, we will study the KK compactification of supergravity models in higher dimensions. Supergravity models in higher dimensions have: -a graviton, described by the metric \(g_{\mu \nu }\) (which can be written as \(e^a_\mu \eta _{ab}e^b_\nu \)), except for the coupling to fermions, which is written in terms of \(\omega _\mu ^{ab}(e ...
H. Nastase
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Enriques and octonionic magic supergravity models [PDF]
Journal of High Energy Physics, 2008 We reconsider the Enriques Calabi Yau (FHSV) model and its string derivation and argue that the Octonionic magic supergravity theory admits a string interpretation closely related to the Enriques model. The uplift to D=6 of the Octonionic magic model has 16 abelian vectors related to the rank of Type I and Heterotic strings.
Sergio Ferrara +3 more
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Strongest experimental constraints on SU(5)×U(1) supergravity models [PDF]
Physical Review D, Particles and fields, 1994 We consider a class of well-motivated string-inspired flipped SU(5) supergravity models which include four supersymmetry-breaking scenarios: no-scale, strict no-scale, dilaton, and special dilaton, such that only three parameters are needed to describe ...
Jorge L. Lopez +3 more
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Double-copy towards supergravity inflation with α-attractor models [PDF]
Journal of High Energy Physics, 2022 Key to the simplicity of supergravity α -attractor models of inflation are Volkov-Akulov fermions, often in the form of nilpotent superfields. Here we explore the possibility of using the double-copy to construct theories of Dirac-Born-Infeld-Volkov ...
J. J. Carrasco +2 more
semanticscholar +1 more source
Supergravity solution-generating techniques and canonical transformations of σ-models from O(D, D) [PDF]
Journal of High Energy Physics, 2021 Within the framework of the flux formulation of Double Field Theory (DFT) we employ a generalised Scherk-Schwarz ansatz and discuss the classification of the twists that in the presence of the strong constraint give rise to constant generalised fluxes ...
R. Borsato, Sibylle Driezen
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