540 citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- A. Paliathanasis2 profiles185 · h 42
- G. Leon2 profiles55 · h 31
- M. Govender2 profiles30 · h 21
- M. Znojil2 profiles27 · h 34
- K. G. Zloshchastiev26 · h 18
- P. Leach4 profiles22 · h 15
- S. Pan22 · h 46
- Supriya Pan3 profiles21 · h 14
- Weiqiang Yang2 profiles21 · h 42
- N. Dimakis2 profiles19 · h 21
- A. Giacomini2 profiles13 · h 19
- E. di Valentino10 · h 2
- Austral University of ChileCL111 papers
- Universidad Católica del NorteCL85 papers
- Presidency UniversityIN34 papers
- University of KwaZulu-NatalZA34 papers
- National and Kapodistrian University of AthensGR26 papers
- University of Hradec KrálovéCZ25 papers
- Czech Academy of Sciences, Nuclear Physics InstituteCZ24 papers
- Liaoning Normal UniversityCN22 papers
- National Institute for Theoretical PhysicsZA22 papers
- University of SheffieldGB16 papers
- National Observatory of AthensGR14 papers
- North-West UniversityZA14 papers
332 papers
Inverse Feshbach's problem: Solvability and solutions
Miloslav Znojil
Given a certain specific, by matrix form of the Feshbach's effective (i.e., energy-dependent) Hamiltonian , the inverse-problem reconstruction of the…
Environment-assisted squeezing in a coherently driven non-Hermitian degenerate parametric oscillator
Muhdin Abdo Wodedo, Berihu Teklu, Konstantin G. Zloshchastiev +2
Environment-assisted approaches to nonclassical light offer a practical path to strong squeezing in imperfect, lossy platforms. In this paper, we study a degenerate parametric osci…
Unifying the Dark Sector with the New Generalized Chaplygin Gas: Observational Constraints
Abdulla Al Mamon, Andronikos Paliathanasis, Subhajit Saha
In light of recent cosmological observations, we examine a generalized Chaplygin gas model with a redshift-dependent exponent as a framework for describing the dark energy and dark…
Triple exceptional point with unitary paths of unfolding in a three-site fermionic Swanson-like model
Bijan Bagchi, Aritra Ghosh, Miloslav Znojil
A fermionic three-site generalization of the popular bosonic Swanson model is studied as providing an exactly solvable five-parametric example of the quantum-mechanical unitary-evo…
Viaggiu holographic dark energy in light of DESI DR2
Amlan K. Halder, Andronikos Paliathanasis, Stefano Viaggiu +2
We test the cosmological viability of the Viaggiu holographic dark energy (VHDE) model by using late-time observational data. In particular, we place constraints on the free parame…
Accelerating scaling solutions from dark matter particle creation
Sudip Halder, Jaume de Haro, Supriya Pan +3
This article opens new window to obtain accelerating scaling attractors without any need of dark energy. We study cosmological dynamics in a two-fluid system where pressureless dar…
Phase transitions in quasi-Hermitian quantum models at exceptional points of order four
Miloslav Znojil
Quantum phase transition is interpreted as an evolution, at the end of which a parameter-dependent Hamiltonian loses its observability. In the language of mathematics, such…
Hints Beyond CDM from Barrow and Tsallis Holographic Dark Energy with GO cutoff
G. G. Luciano, A. Paliathanasis, G. Leon +2
Barrow and Tsallis Holographic Dark Energy (HDE) are two recent extensions of the standard HDE framework, obtained by introducing generalized entropy corrections through the Barrow…
Joint Constraints on Neutrinos and Dynamical Dark Energy in Minimally Modified Gravity
Artur Ladeira, Rafael C. Nunes, Supriya Pan +1
The \(w_{\dagger}\)VCDM framework provides a theoretically well-controlled extension of \(Λ\)CDM within the class of minimally modified gravity theories, allowing for flexible cosm…
Non-Hermitian Bose-Hubbard-like quantum models
Miloslav Znojil
Among all of the non-Hermitian large-tridiagonal-matrix quantum Hamiltonians we choose a subclass with the structure resembling the ``benchmark'' realistic Bose-Hubbard model. We d…
Beyond Two Parameters: Revisiting Dark Energy with the Latest Cosmic Probes
Hanyu Cheng, Supriya Pan, Eleonora Di Valentino
Dark energy (DE) models with many free parameters are often considered excessive, as constraining all parameters poses a significant challenge. While such models offer greater flex…
Observational constraints on the modified cosmology inspired by string T-duality
G. G. Luciano, A. Paliathanasis, A. Sheykhi
We explore the cosmological consequences of a modified cosmology inspired by string T-duality. We incorporate the zero-point length correction, , into the gravitational potent…
Emergence and localization of exceptional points in an exactly solvable toy model
Miloslav Znojil
The most elementary non-Hermitian quantum square-well problem with real spectrum is considered. The Schroedinger equation is required discrete and endowed with PT-symmetric Robin (…
Phantom cosmology with arbitrary potential: New accelerating scaling attractors
Sudip Halder, Supriya Pan, Paulo M. Sá +1
In this article, we investigate the existence of accelerating scaling solutions in coupled phantom cosmology without assuming any specific potential for the phantom scalar field. T…
Compact Stars in Symmetric Teleparallel Scalar-Tensor Gravity
Grigorios Panotopoulos, Andrés Lueiza-Colipí, Nikolaos Dimakis +1
We investigate the existence of static, spherically symmetric compact objects within the framework of symmetric teleparallel scalar-tensor gravity. This theory extends the Brans-Di…
Scalar-Tensor Symmetric Teleparallel Gravity: Reconstruct the Cosmological History with a Steep Potential
Ghulam Murtaza, Avik De, Andronikos Paliathanasis
Within the framework of scalar-non-metricity gravity, we introduce a steep potential together with a power-law coupling function and investigate whether the acceleration phases of…
Anisotropic Spacetimes in -gravity: Bianchi I, Bianchi III and Kantowski-Sachs Cosmologies
R. Bogadi, A. Giacomini, M. Govender +3
We investigate the evolution of cosmological anisotropies within the framework of -gravity. Specifically, we consider a locally rotationally symmetric geometry in…
Modified cosmology through generalized mass-to-horizon entropy: observational constraints from DESI DR2 BAO data
Giuseppe Gaetano Luciano, Andronikos Paliathanasis
A generalized mass-to-horizon entropy has recently been proposed as an extension of the Bekenstein-Hawking area law, derived from a modified mass-horizon relation constructed to en…
Challenging CDM with Higher-Order GUP Corrections
Andronikos Paliathanasis, Genly Leon, Yoelsy Leyva +2
We study quantum corrections to the CDM model model arising from a minimum measurable length in Heisenberg's uncertainty principle. We focus on a higher-order Generalized Uncert…
Construction of maximally non-Hermitian potentials under unbroken PT-symmetry constraint
Miloslav Znojil
A family of discrete Schrödinger equations with imaginary potentials is studied. Inside the domain of unitarity-compatible values of , the reality of all of…
Solving an Interacting Quintessence Model with a Sound Horizon Initial Condition and its Observational Constraints
Wenzhong Liu, Yabo Wu, Supriya Pan +1
Astronomical observations suggest that the current standard -Cold Dark Matter model in modern cosmology has some discrepancies when fitting the data during the whole expansion h…
Is Dark Energy an Effective Manifestation of Non-equilibrium Thermodynamics? -- Insights from DESI
Sauvik Bhattacharjee, Sudip Halder, Jaume de Haro +2
We investigate the background cosmological expansion on the onset of cosmological homogeneous matter creation scenario, a dynamical dark matter approach (), and…
Shape of Dark Energy: Constraining Its Evolution with a General Parametrization
Dong Ha Lee, Weiqiang Yang, Eleonora Di Valentino +2
We consider a general dark energy (DE) model parametrized by its equation-of-state (EoS), featuring three free parameters: (the present-day value of the DE EoS), (quant…
Reconstruction of full-space quantum Hamiltonian from its effective, energy-dependent model-space projection
Miloslav Znojil
Reconstruction of a full-space quantum Hamiltonian from its effective Feshbach's model-space avatar is shown feasible. In a preparatory step the information carried by the effectiv…