Publications (84)
Tension and constraints on modified gravity parametrizations of $G_{\textrm{eff}}(z)$ from growth rate and Planck data
Savvas Nesseris, George Pantazis, Leandros Perivolaropoulos
New Parametrization for the Scale Dependent Growth Function in General Relativity
James B. Dent, Sourish Dutta, Leandros Perivolaropoulos
BAO miscalibration cannot rescue late-time solutions to the Hubble tension
Davide Pedrotti, Luis A. Escamilla, Valerio Marra +2
Formation of Vortices in First Order Phase Transitions
Alejandra Melfo, Leandros Perivolaropoulos
The spherical collapse model and cluster formation beyond the $Î$ cosmology: Indications for a clustered dark energy?
S. Basilakos, J. C. Bueno Sanchez, Leandros Perivolaropoulos
Sub-millimeter Spatial Oscillations of Newton's Constant: Theoretical Models and Laboratory Tests
Leandros Perivolaropoulos
Dynamics of Nontopological Solitons - Q Balls
Minos Axenides, Stavros Komineas, Leandros Perivolaropoulos +1
A New Statistic for the Detection of Long Strings in Microwave Background Maps
Leandros Perivolaropoulos
Static Dark Fluid Thin Shells in Schwarzschild-de Sitter Spacetimes: Stability and Black Hole Shadows
Dimitrios Efstratiou, Evangelos Achilleas Paraskevas, Leandros Perivolaropoulos
Effects of a Late Gravitational Transition on Gravitational Waves and Anticipated Constraints
Evangelos Achilleas Paraskevas, Leandros Perivolaropoulos
Hints for a gravitational constant transition in Tully-Fisher data
George Alestas, Ioannis Antoniou, Leandros Perivolaropoulos
Vacuum Energy, the Cosmological Constant and Compact Extra Dimensions: Constraints from Casimir Effect Experiments
Leandros Perivolaropoulos
Observational constraints on the deceleration parameter in a tilted universe
Kerkyra Asvesta, Lavrentios Kazantzidis, Leandros Perivolaropoulos +1
The CosmoVerse White Paper: Addressing observational tensions in cosmology with systematics and fundamental physics
Eleonora Di Valentino, Jackson Levi Said, Adam Riess +533
Spectral Analysis of Microwave Background Perturbations Induced by Cosmic Strings
Leandros Perivolaropoulos
Detailed Stability Analysis of Electroweak Strings
Margaret James, Leandros Perivolaropoulos, Tanmay Vachaspati
Gravitational transitions via the explicitly broken symmetron screening mechanism
Leandros Perivolaropoulos, Foteini Skara
Power Spectrum of Cosmic String Perturbations on the Microwave Background
Leandros Perivolaropoulos
Gravitational Wave Signatures Induced by Dark Fluid Accretion in Binary Systems
Evangelos Achilleas Paraskevas, Leandros Perivolaropoulos
Hints of Modified Gravity in Cosmos and in the Lab?
Leandros Perivolaropoulos, Lavrentios Kazantzidis
Spectra and Statistics of Cosmic String Perturbations on the Microwave Background: A Monte Carlo Approach
Andrea M. Gilbert, Leandros Perivolaropoulos
The fate of bound systems through Sudden Future Singularities
Leandros Perivolaropoulos
A Statistic for the Detection of Long Strings in Microwave Background Maps
Leandros Perivolaropoulos
The Hubble Tension, The $M$ Crisis of Late Time $H(z)$ Deformation Models and the Reconstruction of Quintessence Lagrangians
Anastasios Theodoropoulos, Leandros Perivolaropoulos
Domain Walls and Vortices with Non-Symmetric Core
Minos Axenides, Leandros Perivolaropoulos
COBE vs Cosmic Strings: An Analytical Model
Leandros Perivolaropoulos
Large Scale Structure by Global Monopoles and Cold Dark Matter
Leandros Perivolaropoulos
Special Issue on Modified Gravity Approaches to the Tensions of $Î$CDM: Goals and Highlights
Eleonora Di Valentino, Leandros Perivolaropoulos, Jackson Levi Said
Geodesics of McVittie Spacetime with a Phantom Cosmological Background
Ioannis Antoniou, Leandros Perivolaropoulos
Late-transition vs smooth $H(z)$ deformation models for the resolution of the Hubble crisis
George Alestas, David Camarena, Eleonora Di Valentino +4
Signatures of Cosmic Strings on the Microwave Background
Leandros Perivolaropoulos, Richhild Moessner, Robert Brandenberger
Testing gravitational wave polarizations with LISA
Shingo Akama, Maxence Corman, Paola C. M. Delgado +16
Probing the Universe's Topology through a Quantum System?
Evangelos Achilleas Paraskevas, Leandros Perivolaropoulos
The density of virialized clusters as a probe of dark energy
Evangelos A. Paraskevas, Leandros Perivolaropoulos
Is gravity getting weaker at low z? Observational evidence and theoretical implications
Lavrentios Kazantzidis, Leandros Perivolaropoulos
Hubble Tension and the G-step Model: Re-examination of Recent Constraints on Modified Local Physics
Leandros Perivolaropoulos, Ruchika
Observational constraints on viable f(R) parametrizations with geometrical and dynamical probes
Spyros Basilakos, Savvas Nesseris, Leandros Perivolaropoulos
Large Scale Cosmological Anomalies and Inhomogeneous Dark Energy
Leandros Perivolaropoulos
A reanalysis of the latest SH0ES data for $H_0$: Effects of new degrees of freedom on the Hubble tension
Leandros Perivolaropoulos, Foteini Skara
Constraints on Spatially Oscillating Sub-mm Forces from the Stanford Levitated Microsphere Experiment Data
Ioannis Antoniou, Leandros Perivolaropoulos
Parametrization for the Scale Dependent Growth in Modified Gravity
Juan C. Bueno Sanchez, James B. Dent, Sourish Dutta +1
Topological Defects with Non-Symmetric Core
Minos Axenides, Leandros Perivolaropoulos
Weak gravity on a $Î$CDM background
Radouane Gannouji, Leandros Perivolaropoulos, David Polarski +1
A $w-M$ phantom transition at $z_t<0.1$ as a resolution of the Hubble tension
George Alestas, Lavrentios Kazantzidis, Leandros Perivolaropoulos
Cosmic Strings and Cosmic Variance
Alejandro Gangui, Leandros Perivolaropoulos
Dissecting the Hubble tension: Insights from a diverse set of Sound Horizon-free H0 measurements
Ioannis Pantos, Leandros Perivolaropoulos
On the Statistics of CMB Fluctuations Induced by Topological Defects
Leandros Perivolaropoulos
Addressing the DESI DR2 Phantom-Crossing Anomaly and Enhanced $H_0$ Tension with Reconstructed Scalar-Tensor Gravity
Dimitrios Efstratiou, Evangelos Achilleas Paraskevas, Leandros Perivolaropoulos
On the isotropy of SnIa absolute magnitudes in the Pantheon+ and SH0ES samples
Leandros Perivolaropoulos
Transition dynamics in the $Î_{\rm s}$CDM model: Implications for bound cosmic structures
Evangelos A. Paraskevas, Arman Cam, Leandros Perivolaropoulos +1
Nontopological Global Field Dynamics
Leandros Perivolaropoulos
Dilatonic Topological Defects in 3+1 Dimensions and their Embeddings
Nikos Platis, Ioannis Antoniou, Leandros Perivolaropoulos
Dynamical dark energy with AdS-to-dS and dS-to-dS transitions: Implications for the $H_0$ tension
Ãzgür Akarsu, Leandros Perivolaropoulos, Anna Tsikoundoura +2
Consistency of Modified Gravity with a decreasing $G_{\rm eff}(z)$ in a $Î$CDM background
Radouane Gannouji, Lavrentios Kazantzidis, Leandros Perivolaropoulos +1
The Fourier Space Statistics of Seedlike Cosmological Perturbations
Leandros Perivolaropoulos
Topological Quintessence
Juan C. Bueno Sanchez, Leandros Perivolaropoulos
Modified Gravity and Cosmology: An Update by the CANTATA Network
Emmanuel N. Saridakis, Ruth Lazkoz, Vincenzo Salzano +50
Impact of the SNe Ia Magnitude Transition at 20 Mpc on Cosmological Parameter Estimation
Leandros Perivolaropoulos, Chrisostomos-Panagiotis Stamou
Hubble tension or a transition of the Cepheid SnIa calibrator parameters?
Leandros Perivolaropoulos, Foteini Skara
On the homogeneity of SnIa absolute magnitude in the Pantheon+ sample
Leandros Perivolaropoulos, Foteini Skara
A Friendly Phantom: Late-time AdS-to-dS transition and cosmological tensions
Ãzgür Akarsu, Leandros Perivolaropoulos, A. Emrah Yükselci +1
Status of the $S_8$ Tension: A 2026 Review of Probe Discrepancies
Ioannis Pantos, Leandros Perivolaropoulos
On the origin of the BAOtr-DESI tension
Ioannis Pantos, Leandros Perivolaropoulos
A rapid transition of $G_{\rm eff}$ at $z_t \simeq 0.01$ as a solution of the Hubble and growth tensions
Valerio Marra, Leandros Perivolaropoulos
Effects of a local physics change on the SH0ES determination of $H_0$
Ruchika, Leandros Perivolaropoulos, Alessandro Melchiorri
Existence of Double Vortex Solutions
Leandros Perivolaropoulos
Linear matter density perturbations in the $Î_{\rm s}$CDM model: Examining growth dynamics and addressing the $S_8$ tension
Ãzgür Akarsu, Arman Ãam, Evangelos A. Paraskevas +1
Existence and Stability of Spinning Embedded Vortices
Leandros Perivolaropoulos
Stabilizing the Semilocal String with a Dilatonic Coupling
Leandros Perivolaropoulos, Nikos Platis
Evolution of the $fÏ_8$ tension with the Planck15/$Î$CDM determination and implications for modified gravity theories
Lavrentios Kazantzidis, Leandros Perivolaropoulos
Phase Transitions in the Core of Global Embedded Defects
Minos Axenides, Leandros Perivolaropoulos, Mark Trodden
Metastable Cosmological Constant and Gravitational Bubbles: Ultra-Late-Time Transitions in Modified Gravity
Dimitrios Efstratiou, Leandros Perivolaropoulos
Is the Hubble crisis connected with the extinction of dinosaurs?
Leandros Perivolaropoulos
A general realistic treatment of the disk paradox
George Pantazis, Leandros Perivolaropoulos
On the Asymptotics of Nielsen-Olesen Vortices
Leandros Perivolaropoulos
CMB Maximum Temperature Asymmetry Axis: Alignment with Other Cosmic Asymmetries
Antonio Mariano, Leandros Perivolaropoulos
Challenges for $Î$CDM: An update
Leandros Perivolaropoulos, Foteini Skara
Dynamical dark energy with AdS-dS transitions vs. Baryon Acoustic Oscillations at $z =$ 2.3-2.4
Ãzgür Akarsu, Maxim Eingorn, Leandros Perivolaropoulos +2
Stable, Spinning Embedded Vortices
Leandros Perivolaropoulos
The Laser Interferometer Space Antenna mission in Greece White Paper
Nikolaos Karnesis, Nikolaos Stergioulas, Georgios Pappas +18
Large-scale peculiar velocities in the universe
Christos G. Tsagas, Leandros Perivolaropoulos, Kerkyra Asvesta
Hubble tension tomography: BAO vs SnIa distance tension
Dimitrios Bousis, Leandros Perivolaropoulos
Is there Correlation between Fine Structure and Dark Energy Cosmic Dipoles?
Antonio Mariano, Leandros Perivolaropoulos
Hubble Tension or Distance Ladder Crisis?
Leandros Perivolaropoulos