output
19982026
most citedCosmology Intertwined II: The Hubble Constant Tension

540 citations

researchers with a paper here

Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.

collaborating institutions
Showing 2019Show all

32 papers · 1 filter

gr-qc2019★ 7 cited

Exact solutions of Einstein-aether gravity in Bianchi Type V Cosmology

M. Roumeliotis, A. Paliathanasis, Petros A. Terzis +1

We present the solution space of the field equations in the Einstein-aether theory for the case of a vacuum Bianchi Type V space-time. We also find that there are portions of the i…

gr-qc2019★ 53 cited

Dynamics and cosmological evolution in Λ-varying cosmology

G. Papagiannopoulos, Pavlina Tsiapi, Spyros Basilakos +1

We study the dynamical properties of a large body of varying vacuum cosmologies for which dark matter interacts with vacuum. In particular, performing the critical point analysis w…

gr-qc2019★ 7 cited

Inhomogeneous spacetimes in Einstein-æther Cosmology

Andronikos Paliathanasis

We investigate the existence of inhomogeneous Szekeres spacetimes in Einstein-æther theory. We show that inhomogeneous solutions which can be seen as extension of the Szekeres solu…

quant-ph2019★ 5 cited

Phase space formulation of density operator for non-Hermitian Hamiltonians and its application in quantum theory of decay

Ludmila Praxmeyer, Konstantin G. Zloshchastiev

The Wigner-Weyl transform and phase space formulation of a density matrix approach are applied to a non-Hermitian model which is quadratic in positions and momenta. We show that in…

gr-qc2019★ 12 cited

Similarity solutions for the Wheeler-DeWitt equation in -cosmology

Andronikos Paliathanasis

In the case of a spatially flat Friedmann--Lema\^ıtre--Robertson--Walker universe in -gravity we write the Wheeler-DeWitt equation of quantum cosmology. The equa…

gr-qc2019

Symmetry Analysis In Inflationary Cosmology

Andronikos Paliathanasis

We approach the cosmological inflation thought symmetries of differential equations. We consider the general inflaton field in a homogeneous Friedmann--Lema\^ıtre--Robertson--Walke…

astro-ph.HE2019★ 9 cited

Similarity Inner Solutions for the Pulsar Equation

Andronikos Paliathanasis

Lie symmetries are applied to classify the source of the magnetic field for the Pulsar equation near to the surface of the neutron star. We find that there are six possible differe…

nlin.SI2019★ 26 cited

One-dimensional optimal system for 2D Rotating Ideal Gas

Andronikos Paliathanasis

We derive the one-dimensional optimal system for a system of three partial differential equations which describe the two-dimensional rotating ideal gas with polytropic parameter $γ…

gr-qc2019★ 15 cited

Conservation laws and Exact Solutions in Brans-Dicke Cosmology with a Scalar Field

Andronikos Paliathanasis

Scalar-tensor theories have drawn the attention of cosmologist for the past few years because they can provide mechanism to explain the observable phenomena. Moreover, the results…

quant-ph2019★ 21 cited

Non-Hermitian coupled cluster method for non-stationary systems and its interaction-picture reinterpretation

R. F. Bishop, M. Znojil

The interaction picture in a non-Hermitian realization is discussed in detail and considered for its practical use in many-body quantum physics. The resulting non-Hermitian interac…

quant-ph2019★ 11 cited

Theory of response to perturbations in non-Hermitian systems using five-Hilbert-space reformulation of unitary quantum mechanics

Miloslav Znojil

In conventional Schrödinger representation the unitarity of the evolution of bound states is guaranteed by the Hermiticity of the Hamiltonian. A non-unitary isospectral simplificat…

math-ph2019★ 3 cited

Benney-Lin and Kawahara equations: a detailed study through Lie symmetries and Painlevé analysis

Andronikos Paliathanasis

We perform a detailed study on the integrability of the Benney-Lin and KdV-Kawahara equations by using the Lie symmetry analysis and the singularity analysis. We find that the equa…

math-ph2019★ 14 cited

Lie symmetries and similarity solutions for rotating shallow water

Andronikos Paliathanasis

We study a nonlinear system of partial differential equations which describe rotating shallow water with an arbitrary constant polytropic index for the fluid. In our analysis w…

gr-qc2019★ 31 cited

Static Spherically Symmetric Einstein-aether models II: Integrability and the Modified Tolman-Oppenheimer-Volkoff approach

Genly Leon, A. Coley, Andronikos Paliathanasis

We investigate the existence of analytic solutions for the field equations in the Einstein-æther theory for a static spherically symmetric spacetime and provide a detailed dynamica…

astro-ph.CO2019★ 58 cited

Challenging bulk viscous unified scenarios with cosmological observations

Weiqiang Yang, Supriya Pan, Eleonora Di Valentino +2

In a spatially flat Friedmann-Lemaître-Robertson-Walker universe, we investigate a unified cosmic fluid scenario endowed with bulk viscosity in which the coefficient of the bulk vi…

gr-qc2019★ 23 cited

Dynamics of Einstein-Aether Scalar field Cosmology

Andronikos Paliathanasis, G. Papagiannopoulos, Spyros Basilakos +1

We study the cosmological evolution of the field equations in the context of Einstein-Aether cosmology by including a scalar field in a spatially flat Friedmann--Lema\^ıtre--Robert…

physics.flu-dyn2019★ 10 cited

Matrix logarithmic wave equation and multi-channel systems in fluid mechanics

Konstantin G. Zloshchastiev

We formulate the mapping between a large class of nonlinear wave equations and flow equations for barotropic fluid with internal surface tension and capillary effects. Motivated by…

physics.geo-ph2019★ 23 cited

Nonlinear wave-mechanical effects in Korteweg fluid magma transport

Konstantin G. Zloshchastiev

Statistical mechanics arguments and Madelung hydrodynamical presentation are applied to the transport of magma in volcanic conduits. An effective wave equation with logarithmic non…

quant-ph2019★ 24 cited

On the dynamical nature of nonlinear coupling of logarithmic quantum wave equation, Everett-Hirschman entropy and temperature

Konstantin G. Zloshchastiev

We study the dynamical behavior of nonlinear coupling in a quantum wave equation of a logarithmic type. Using statistical mechanical arguments for a large class of many-body system…

gr-qc2019★ 6 cited

Constructing the CKVs of Bianchi III and V spacetimes

Antonios Mitsopoulos, Michael Tsamparlis, Andronikos Paliathanasis

We determine the conformal algebra of Bianchi III and Bianchi V spacetimes or, equivalently, we determine all Bianchi III and Bianchi V spacetimes which admit a proper conformal Ki…

hep-th2019★ 15 cited

Non-Abelian Proca-Dirac-Higgs theory: particle-like solutions and their energy spectrum

Vladimir Dzhunushaliev, Vladimir Folomeev, Arislan Makhmudov

We study a system consisting of a non-Abelian SU(2) Proca field interacting with nonlinear scalar (Higgs) and spinor fields. For such a system, it is shown that particle-like solut…

gr-qc2019★ 49 cited

Observational constraints of a new unified dark fluid and the tension

Weiqiang Yang, Supriya Pan, Andronikos Paliathanasis +2

Unified cosmological models have received a lot of attention in astrophysics community for explaining both the dark matter and dark energy evolution. The Chaplygin cosmologies, a w…

gr-qc2019★ 28 cited

Cosmological Solutions in Multiscalar Field Theory

N. Dimakis, A. Paliathanasis, Petros A. Terzis +1

We consider a cosmological model with two scalar fields minimally coupled to gravity which have a mixed kinetic term. Hence, Chiral cosmology is included in our analysis. The coupl…

gr-qc2019★ 61 cited

Dynamics of nonlinear interacting dark energy models

Andronikos Paliathanasis, Supriya Pan, Weiqiang Yang

We investigate the cosmological dynamics of interacting dark energy models in which the interaction function is a nonlinear in terms of the energy densities. Considering explicitly…