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Ultraviolet completion of Starobinsky inflation
Ignatios Antoniadis, Chrysoula Markou, Dimitri V. Nanopoulos
We construct an supergravity action whose bosonic part contains an arbitrary function of the scalar curvature, the so-called gravity. As in supergravity, it ca…
--Inflation Derived from 4d Strings, the Role of the Dilaton, and Turning the Swampland into a Mirage
Ignatios Antoniadis, Dimitri V. Nanopoulos, Keith A. Olive
Based on a previously derived superstring model possessing a cosmological sector that mimics Starobinsky inflation, we analyze several questions addressed in the recent literature:…
Observable Signatures of No-Scale Supergravity in NANOGrav
Spyros Basilakos, Dimitri V. Nanopoulos, Theodoros Papanikolaou +2
In light of NANOGrav data we provide for the first time possible observational signatures of Superstring theory. Firstly, we work with inflection-point inflationary potentials natu…
Gravitational wave signatures of no-scale Supergravity in NANOGrav and beyond
Spyros Basilakos, Dimitri V. Nanopoulos, Theodoros Papanikolaou +2
In this Letter, we derive for the first time a characteristic three-peaked GW signal within the framework of no-scale Supergravity, being the low-energy limit of Superstring theory…
Particle physics and cosmology of the string derived no-scale flipped
Ignatios Antoniadis, Dimitri V. Nanopoulos, John Rizos
In a recent paper, we identified a cosmological sector of a flipped model derived in the free fermionic formulation of the heterotic superstring, containing the inflaton an…
Cosmology of the string derived flipped
Ignatios Antoniadis, Dimitri V. Nanopoulos, John Rizos
We study the cosmology of a string derived supersymmetric flipped model in the context of free-fermionic heterotic constructions that allow full calculability of the effect…
Supercritical String Cosmology drains the Swampland
John Ellis, Nick Mavromatos, Dimitri Nanopoulos
The First and Second Swampland Conjectures (FSC & SSC) are substantially modified in non-critical string cosmology, in which cosmic time is identified with the time-like Liouville…
From Minkowski to de Sitter in Multifield No-Scale Models
John Ellis, Balakrishnan Nagaraj, Dimitri V. Nanopoulos +2
We show the uniqueness of superpotentials leading to Minkowski vacua of single-field no-scale supergravity models, and the construction of dS/AdS solutions using pairs of these sin…
Unified No-Scale Attractors
John Ellis, Dimitri V. Nanopoulos, Keith A. Olive +1
We have presented previously a general treatment of Starobinsky-like inflation in no-scale supergravity where the tensor-to-scalar ratio , and is the tilt o…
A General Classification of Starobinsky-like Inflationary Avatars of SU(2,1)/SU(2) x U(1) No-Scale Supergravity
John Ellis, Dimitri V. Nanopoulos, Keith A. Olive +1
Measurements of the cosmic microwave background (CMB) favour models of inflation with a small tensor-to-scalar ratio r, as predicted by the Starobinsky R + R^2 model. It has been s…
De Sitter Vacua in No-Scale Supergravity
John Ellis, Balakrishnan Nagaraj, Dimitri V. Nanopoulos +1
No-scale supergravity is the appropriate general framework for low-energy effective field theories derived from string theory. The simplest no-scale Kähler potential with a single…
From Gravity to No-Scale Supergravity
John Ellis, Dimitri V. Nanopoulos, Keith A. Olive
We show that gravity coupled conformally to scalar fields is equivalent to the real bosonic sector of SU(N,1)/SU(N)U(1) no-scale supergravity, where the conformal fac…
Algebras, Hawking Radiation and Information Retention by Stringy Black Holes
John Ellis, Nick E. Mavromatos, Dimitri V. Nanopoulos
We have argued previously, based on the analysis of two-dimensional stringy black holes, that information in stringy versions of four-dimensional Schwarzschild black holes (whose s…
Information Retention by Stringy Black Holes
John Ellis, Nick E. Mavromatos, D. V. Nanopoulos
Building upon our previous work on two-dimensional stringy black holes and its extension to spherically-symmetric four-dimensional stringy black holes, we show how the latter retai…
Helical Phase Inflation via Non-Geometric Flux Compactifications: from Natural to Starobinsky-like Inflation
Tianjun Li, Zhijin Li, Dimitri V. Nanopoulos
We show that a new class of helical phase inflation models can be simply realized in minimal supergravity, wherein the inflaton is the phase component of a complex field and its po…
Helical Phase Inflation and Monodromy in Supergravity Theory
Tianjun Li, Zhijin Li, Dimitri V. Nanopoulos
We study helical phase inflation in supergravity theory in details. The inflation is driven by the phase component of a complex field along helical trajectory. The helicoid structu…
Helical Phase Inflation
Tianjun Li, Zhijin Li, Dimitri V. Nanopoulos
We show that the quadratic inflation can be realized by the phase of a complex field with helicoid potential. Remarkably, this helicoid potential can be simply realized in minimal…
Aligned Natural Inflation and Moduli Stabilization from Anomalous Gauge Symmetries
Tianjun Li, Zhijin Li, Dimitri V. Nanopoulos
To obtain natural inflation with large tensor-to-scalar ratio in string framework, we need a special moduli stabilization mechanism which can separate the masses of real and imagin…
D-Flation
John Ellis, Nick E. Mavromatos, Dimitri V. Nanopoulos
In a recent paper we showed how Starobinsky-like inflation could emerge from dilaton dynamics in brane cosmology scenarios based on string theory, in which our universe is represen…
Natural Inflation with Natural Trans-Planckian Axion Decay Constant from Anomalous
Tianjun Li, Zhijin Li, Dimitri V. Nanopoulos
We propose a natural inflation model driven by an imaginary or axionic component of a Kähler modulus in string-inspired supergravity. The shift symmetry of the axion is gauged unde…
Chaotic Inflation in No-Scale Supergravity with String Inspired Moduli Stabilization
Tianjun Li, Zhijin Li, Dimitri V. Nanopoulos
The simple chaotic inflation is highly consistent with the BICEP2 experiment, and no-scale supergravity can be realized naturally in various string compactifications. Thus, we cons…
Starobinsky-Like Inflation in Dilaton-Brane Cosmology
John Ellis, Nick E. Mavromatos, Dimitri V. Nanopoulos
We discuss how Starobinsky-like inflation may emerge from dilaton dynamics in brane cosmology scenarios based on string theory, in which our universe is represented as a three-bran…
Starobinsky-like Inflationary Models as Avatars of No-Scale Supergravity
John Ellis, Dimitri V. Nanopoulos, Keith A. Olive
Models of cosmological inflation resembling the Starobinsky R + R^2 model emerge naturally among the effective potentials derived from no-scale SU(N,1)/SU(N) x U(1) supergravity wh…
No-Scale Supergravity Realization of the Starobinsky Model of Inflation
John Ellis, Dimitri V. Nanopoulos, Keith A. Olive
We present a model for cosmological inflation based on a no-scale supergravity sector with an SU(2,1)/U(1) Kahler potential, a single modulus T and an inflaton superfield Phi descr…