299 citations · 312 across the 11 of their papers we have counts for
11 papers
Initial conditions for inflation
Gerasimos Kouniatalis
We propose a single-field mechanism that dynamically prepares the initial conditions required for exponential plateau inflation. The inflaton is decomposed into a coarse-grained mo…
Primordial black hole formation from transient cosmology
Gerasimos Kouniatalis, Theodoros Papanikolaou, Spyros Basilakos +1
We study primordial black hole (PBH) formation in a minimally coupled teleparallel cosmology that generates a transient departure from standard radiation domination. The mod…
A Unified Scalar-Field Mechanism for the , and Evolving Dark-Energy Tensions
Gerasimos Kouniatalis
We propose a unified scalar-field framework that addresses, within standard general relativity, three current cosmological anomalies: the tension, the mild preference for red…
A null test of the Hubble tension
Gerasimos Kouniatalis, Emmanuel N. Saridakis
The origin of the Hubble tension remains one of the central open problems in modern cosmology, with competing explanations invoking either early-Universe physics, late-time modific…
Bohmian Quantum Cosmology from the Wheeler-DeWitt Equation
Spyros Basilakos, Gerasimos Kouniatalis, Emmanuel N. Saridakis +1
We construct a Bohmian quantum cosmological model for a spatially flat Friedmann Robertson Walker universe filled with a single scalar field whose potential provides a unified desc…
The Wave Function of the Universe and Inflation
Gerasimos Kouniatalis
We develop a quantum-cosmological framework in which the inflationary potential emerges from the structure of the wave function of the universe rather than being postulated. Starti…
Near-horizon Geodesic Instabilities and Anomalous Decay of Quasinormal Modes in Weyl Black Holes
Gerasimos Kouniatalis, P. A. González, Eleftherios Papantonopoulos +1
We study the stability of the Weyl geometry considering an exact black hole solution. By calculating the geodesics of massless and massive scalar fields orbiting outside the Weyl b…
Lensing by black holes within astrophysical environments
Gerasimos Kouniatalis, Arthur G. Suvorov, Kyriakos Destounis
Astrophysical black holes are likely to be surrounded by various forms of matter in the form of disks or halos. While a number of studies have examined the impact of an environment…
Inflation from a generalized exponential plateau: towards extra suppressed tensor-to-scalar ratios
Gerasimos Kouniatalis, Emmanuel N. Saridakis
We investigate a standard minimally-coupled scalar-field inflationary scenario, which is based on a new potential, with suitably generalized plateau features, that leads to extra s…
The CosmoVerse White Paper: Addressing observational tensions in cosmology with systematics and fundamental physics
Eleonora Di Valentino, Jackson Levi Said, Adam Riess +533
The standard model of cosmology has provided a good phenomenological description of a wide range of observations both at astrophysical and cosmological scales for several decades.…
Modified gravity from Weyl connection and the extension
Gerasimos Kouniatalis, Emmanuel N. Saridakis
We use Weyl connection and Weyl geometry in order to construct novel modified gravitational theories. In the simplest case where one uses only the Weyl-connection Ricci scalar as a…