Search Results - "Oikonomou, Vasilis K"

Recent Advances in Inflation by Odintsov, Sergei D., Oikonomou, Vasilis K., Giannakoudi, Ifigeneia, Fronimos, Fotis P., Lymperiadou, Eirini C.

“…We review recent trends in inflationary dynamics in the context of viable modified gravity theories. After providing a general overview of the inflationary…”
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Uniqueness of the Inflationary Higgs Scalar for Neutron Stars and Failure of Non-Inflationary Approximations by Oikonomou, Vasilis K.

“…Neutron stars are perfect candidates to investigate the effects of a modified gravity theory, since the curvature effects are significant and more importantly,…”
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Engineering and Materials: Editorial by Oikonomou, Vasilis K.

“…Modern engineering and materials sciences are facing many challenges pertaining to optimization, efficiency, economic growth, reliability, safety, green…”
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Spectrum of Primordial Gravitational Waves in Modified Gravities: A Short Overview by Odintsov, Sergei, Oikonomou, Vasilis, Myrzakulov, Ratbay

“…In this work, we shall exhaustively study the effects of modified gravity on the energy spectrum of the primordial gravitational waves background. S. Weinberg…”
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Chandrasekhar Mass Limit of White Dwarfs in Modified Gravity by Astashenok, Artyom, Odintsov, Sergey, Oikonomou, Vasilis

“…We investigate the Chandrasekhar mass limit of white dwarfs in various models of f(R) gravity. Two equations of state for stellar matter are used: the simple…”
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Towards Modelling Mechanical Shaking Using Potential Energy Surfaces: A Toy Model Analysis by Odintsov, Sergei D., Oikonomou, Vasilis K.

“…In this work, we formalize the effect of mechanical shaking by using various forms of an externally exerted force, which may be constant or may be…”
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Rp attractors static neutron star phenomenology by Oikonomou, Vasilis K

“…In this work, we study the neutron star phenomenology of Rp attractor theories in the Einstein frame. The Einstein frame Rp attractor theories have the…”
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Effects of a Geometrically Realized Early Dark Energy Era on the Spectrum of Primordial Gravitational Waves by Oikonomou, Vasilis K., Lymperiadou, Eirini C.

“…In this work, we investigate the effects of a geometrically generated early dark energy era on the energy spectrum of the primordial gravitational waves. The…”
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Kinetic Axion f(R) Gravity Phase Space by Oikonomou, Vasilis K., Fronimos, Fotis P., Razina, Olga, Tsyba, Pyotr

“…In this work, we studied the phase space of f(R) gravity in the presence of a misalignment axion, including parity violating Chern–Simons terms. We construct…”
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f(R)$f(R)$‐Gravity Generated Post‐Inflationary Eras and Their Effect on Primordial Gravitational Waves by Oikonomou, Vasilis K.

“…In this work the effects of a geometrically generated post‐inflationary era on the energy spectrum of the primordial gravitational waves are considered…”
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On Non-Linear Behavior of Viscosity in Low-Concentration Solutions and Aggregate Structures by Oikonomou, Vasilis

“…In this paper, an experimental method that may reveal possible aggregate symmetrical structures in highly diluted solutions is proposed, generated by the…”
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Non-Extensive Thermodynamics Effects in the Cosmology of f(T) Gravity by Shalaby, Asmaa G., Oikonomou, Vasilis K., Nashed, Gamal G. L.

“…Using f(T) gravitational theory, we construct modified cosmological models via the first law of thermodynamics by using the non-extensive thermodynamics…”
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Compact stars with dark energy in general relativity and modified gravity by Astashenok, Artyom V., Odintsov, Sergey D., Oikonomou, Vasilis K.

“…We investigate realistic models of compact objects, focusing on neutron and strange stars, composed by dense matter and dark energy in the form of a simple…”
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Kinetic Axion If/I Gravity Phase Space by Oikonomou, Vasilis K, Fronimos, Fotis P, Razina, Olga, Tsyba, Pyotr

“…In this work, we studied the phase space of f(R) gravity in the presence of a misalignment axion, including parity violating Chern–Simons terms. We construct…”
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Extended Supersymmetric Quantum Mechanics Algebras in Scattering States of Fermions off Domain Walls by Kleidis, Konstantinos, Oikonomou, Vasilis K.

“…We study the underlying extended supersymmetric structure in a system composed of fermions scattered off an infinitely extended static domain wall in the xz…”
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Nitrogen and Phosphorus Co-Doped Carbon Dots for the Growth Promotion of Water Spinach by Yu, Fan, She, Mengqi, Cai, Xia, Li, Xiaoyan, Huang, Yuan, Lei, Hongwei, Tan, Zuojun

“…Carbon dots have received much attention due to their unique physicochemical properties and diverse applications in bioimaging, optoelectronic devices,…”
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Compact Stars with Dark Energy in General Relativity and Modified Gravity by Astashenok, Artyom V, Odintsov, Sergey D, Oikonomou, Vasilis K

“…We investigate realistic models of compact objects, focusing on neutron and strange stars, composed by dense matter and dark energy in the form of a simple…”
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Maximal Masses of White Dwarfs for Polytropes in $R^2$ Gravity and Theoretical Constraints by Astashenok, Artyom V, Odintsov, Sergey D, Oikonomou, Vasilis K

“…We examine the Chandrasekhar limit for white dwarfs in $f(R)$ gravity, with a simple polytropic equation of state describing stellar matter. We use the most…”
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Dark Energy and Cosmological Horizon Thermal Effects by Astashenok, Artyom V, Odintsov, Sergei D, Oikonomou, Vasilis K

“…We investigate various dark energy models by taking into account the thermal effects induced from Hawking radiation on the apparent horizon of the Universe,…”
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Extended Gravity Description for the GW190814 Supermassive Neutron Star by Astashenok, Artyom V, Capozziello, Salvatore, Odintsov, Sergei D, Oikonomou, Vasilis K

“…Very recently a compact object with a mass in the range $2.50\div 2.67\, M_{\odot}$ has been discovered via gravitational waves detection of a compact binary…”
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