53 citations · 279 across the 14 of their papers we have counts for
14 papers
Mechanisms for producing Primordial Black Holes from Inflationary Models Beyond Fine-Tuning
Ioanna Stamou
In this study, we present an analysis of the fine-tuning required in various inflationary models in order to explain the production of Primordial Black Holes (PBHs). We specificall…
Reconstructing Primordial Black Hole Power Spectra from Gravitational Waves
Daniel Frolovsky, Florian Kuhnel, Ioanna Stamou
A novel methodology for analysing the relation between the energy density in gravitational waves and primordial power spectra is developed. Focusing on scalar-induced gravitational…
Large curvature fluctuations from no-scale supergravity with a spectator field
Ioanna D. Stamou
We investigate the large curvature perturbations which can lead to the formation of primordial black holes (PBHs) in the context of no-scale supergravity. Our study does not depend…
Can Primordial Black Holes form in the Standard Model ?
Ioanna Stamou, Sebastien Clesse
We investigate the viability of primordial black hole (PBH) formation in the Standard Model (SM) in a scenario that does not rely on specific inflationary features or any exotic ph…
Primordial Black Holes without fine-tuning from a light stochastic spectator field
Ioanna Stamou, Sebastien Clesse
We investigate a mechanism of primordial black hole (PBH) formation that avoids any dependence on specific inflationary features or exotic physics. In this scenario, the required l…
Exploring Critical Overdensity Thresholds in Inflationary Models of Primordial Black Holes Formation
Ioanna D. Stamou
In this paper we study the production of Primordial Black Holes (PBHs) from inflation in order to explain the Dark Mater (DM) in the Universe. The evaluation of the fractional PBHs…
The CMSSM Survives Planck, the LHC, LUX-ZEPLIN, Fermi-LAT, H.E.S.S. and IceCube
John Ellis, Keith A. Olive, Vassilis C. Spanos +1
We revisit the viability of the CMSSM, searching for regions of parameter space that yield a neutralino dark matter density compatible with Planck measurements, as well as LHC cons…
Primordial Black Holes and Gravitational Waves in Multi-Axion-Chern-Simons Inflation
Nick E. Mavromatos, Vassilis C. Spanos, Ioanna D. Stamou
We study aspects of inflation and the possibility of enhanced production of primordial black holes (PBHs) and gravitational waves (GWs) in a string-inspired model of two axion fiel…
Gravitational Waves From No-Scale Supergravity
Vassilis C. Spanos, Ioanna D. Stamou
In this paper we study four concrete models, based on no-scale supergravity with SU(2,1)/SU(2) U(1) symmetry. We modify either the Kähler potential or the superpotential, w…
Primordial Black Holes And Gravitational Waves Based On No-Scale Supergravity
Ioanna D. Stamou
In this paper we present a class of models in order to explain the production of Primordial Black Holes (PBHs) and Gravitational Waves (GWs) in the Universe. These models are based…
Gravitational Waves and Primordial Black Holes from Supersymmetric Hybrid Inflation
Vassilis C. Spanos, Ioanna D. Stamou
We study the effect of supergravity corrections due to a linear and a bilinear term in the Kähler potential, in the context of a supersymmetric hybrid inflation model. By appropria…
Spectrum oscillations from features in the potential of single-field inflation
I. Dalianis, G. P. Kodaxis, I. D. Stamou +2
We study single-field inflationary models with steep step-like features in the potential that lead to the temporary violation of the slow-roll conditions during the evolution of th…
Mechanisms of Producing Primordial Black Holes By Breaking The SU(2,1)/SU(2)U(1) Symmetry
Ioanna D. Stamou
In this paper we present a class of potentials derived by no-scale supergravity in order to explain the production of primordial black holes (PBHs) in the Universe. By breaking the…
Primordial Black Holes from No-Scale Supergravity
Dimitri V. Nanopoulos, Vassilis C. Spanos, Ioanna D. Stamou
We calculate the primordial black hole abundance in the context of a Wess-Zumino type no-scale supergravity model. We modify the Kähler potential, by adding an extra exponential te…