267 citations · 670 across the 28 of their papers we have counts for
28 papers
Dynamical friction shear and rotation in Chaplygin cosmology
A. Del Popolo, Saeed Fakhry, Maryam Shiravand +1
In this study, we build upon the findings of Del Popolo et al. (2013) by further analyzing the influence of dynamical friction on the evolution of cosmological perturbations within…
Diversity of Fuzzy Dark Matter Solitons
Chen Tan, M. Le Delliou, Ke Wang
According to the Schrödinger-Poisson equations, fuzzy dark matter (FDM) can form a stable equilibrium configuration, the so-called FDM soliton. In principle, given the FDM particle…
Model-independent Test of the Cosmic Anisotropy with Inverse Distance Ladder
Zong-Fan Yang, Da-Wei Yao, Ke Wang
If the Universe is endowed with cosmic anisotropy, it will have a preferred direction of expansion. Reconstructing the expansion history by Gaussian Process (GP) can be used to pro…
New insights on null and timelike warped symmetric spacetime splittings
Alan Maciel, Morgan Le Delliou, José P. Mimoso
We explore in detail the 2+2 and 1+1+2 formalism in spherically symmetric spacetimes, spanning from deducing the dynamical equations to relating them to the well-known generalised…
Neutron star mass in dark matter clumps
Maksym Deliyergiyev, Antonino Del Popolo, Morgan Le Delliou
This paper investigates a hypothesis proposed in previous research relating neutron star (NS) mass and its dark matter (DM) accumulation. As DM accumulates, NS mass decreases, pred…
Constraints on the Local Cosmic Void from the Pantheon Supernovae Data
Ke Wang, Kun-Peng Chen, Morgan Le Delliou
In principle, the local cosmic void can be simply modeled by the spherically symmetric Lemaitre-Tolman-Bondi (LTB) metric. In practice, the real local cosmic void is probably not s…
Bounds from multi-messenger astronomy on the Super Heavy Dark Matter
M. Deliyergiyev, A. Del Popolo, Morgan Le Delliou
The purely gravitational evidence supporting the need for dark matter (DM) particles is compelling and based on Galactic to cosmological scale observations. Thus far, the promising…
Advanced General Relativity Notes
M. Le Delliou
These lecture notes are intended as a guide to Graduate level readers that are already familiar with basic General Relativity. They present in a concise way some advanced concepts…
A Mass Dependent Density Profile from Dwarfs to Clusters
Antonino Del Popolo, Morgan Le Delliou
In this paper, we extend the work of Freundlich et al. 2020 who showed how to obtain a Dekel-Zhao density profile with mass dependent shape parameters in the case of galaxies. In t…
Solution to the hyperon puzzle using dark matter
Antonino Del Popolo, Maksym Deliyergiyev, Morgan Le Delliou
In this paper, we studied the ``hyperon puzzle", a problem that nevertheless the large number of studies is still an open problem. The solution of this issue requires one or more m…
Small scale problems of the CDM model: a short review
Antonino Del Popolo, Morgan Le Delliou
The CDM model, or concordance cosmology, as it is often called, is a paradigm at its maturity. It is clearly able to describe the universe at large scale, even if some issues re…
A dual null formalism for the collapse of fluids in a cosmological background
Alan Maciel, Morgan Le Delliou, José P. Mimoso
In this work we revisit the definition of Matter Trapping Surfaces (MTS) introduced in previous investigations and show how it can be expressed in the so-called dual null formalism…
Non-virialised clusters for detection of Dark Energy-Dark Matter interaction
Morgan Le Delliou, Rafael J. F. Marcondes, Gastao B. Lima Neto +1
The observation of galaxy and gas distributions, as well as cosmological simulations in a CDM Universe, suggests that clusters of galaxies are still accreting mass and are not e…
A unified solution to the small scale problems of the CDM model II: introducing parent-satellite interaction
Antonino Del Popolo, Morgan Le Delliou
We continue the study of the impact of baryon physics on the small scale problems of the CDM model, based on a semi-analytical model (Del Popolo, 2009). Withsuch model, we show…
Separating expansion and collapse in general fluid models with heat flux
Morgan Le Delliou, José Pedro Mimoso, Filipe C. Mena +3
In this paper we consider spherically symmetric general fluids with heat flux, motivated by causal thermodynamics, and give the appropriate set of conditions that define separating…
Local conditions separating expansion from collapse in spherically symmetric models with anisotropic pressures
José P. Mimoso, Morgan Le Delliou, Filipe C. Mena
We investigate spherically symmetric spacetimes with an anisotropic fluid and discuss the existence and stability of a dividing shell separating expanding and collapsing regions. W…
Interacting dark energy collapse with matter components separation
Morgan Le Delliou, Tiago Barreiro
We use the spherical collapse model of structure formation to investigate the separation in the collapse of uncoupled matter (essentially baryons) and coupled dark matter in an int…
Testing the interaction of dark energy to dark matter through the analysis of virial relaxation of clusters Abell Clusters A586 and A1689 using realistic density profiles
Orfeu Bertolami, Francisco Gil Pedro, Morgan Le Delliou
Interaction between dark energy and dark matter is probed through deviation from the virial equilibrium for two relaxed clusters: A586 and A1689. The evaluation of the virial equil…
Separating expansion from contraction: generalized TOV condition, LTB models with pressure and CDM
Morgan Le Delliou, Filipe C. Mena, José Pedro Mimoso
We discuss the existence of a dividing shell separating expanding and collapsing regions in spherically symmetric solutions with pressure. We obtain gauge invariant conditions rela…
Black Holes and Galactic Density Cusps : From Black Hole to Bulge
Morgan Le Delliou, Richard N. Henriksen, Joseph D. Macmillan
Aims. In this paper we continue our study of density cusps that may contain central black holes. Methods. We recall our attempts to use distribution functions with a memory of self…
Black Holes and Galactic Density Cusps Spherically Symmetric Anisotropic Cusps
Morgan Le Delliou, Richard N. Henriksen, Joseph D. Macmillan
Aims: In this paper we study density cusps that may contain central black holes. The actual co-eval self-similar growth would not distinguish between the central object and the sur…
Black holes and Galactic density cusps -- I. Radial orbit cusps and bulges
Morgan Le Delliou, Richard N. Henriksen, Joseph D. Macmillan
In this paper, we study the distribution functions that arise naturally during self-similar radial infall of collisionless matter. Such matter may be thought of either as stars or…
Separating expansion from contraction in spherically symmetric models with a perfect-fluid: Generalization of the Tolman-Oppenheimer-Volkoff condition and application to models with a cosmological constant
José Pedro Mimoso, Morgan Le Delliou, Filipe C. Mena
We investigate spherically symmetric perfect-fluid spacetimes and discuss the existence and stability of a dividing shell separating expanding and collapsing regions. We perform a…
Separating expansion from contraction and generalizing TOV condition in spherically symmetric models with pressure
Morgan Le Delliou, José Pedro Mimoso
We investigate spherically symmetric solutions with pressure and discuss the existence of a dividing shell separating expanding and collapsing regions. We perform a 3+1 splitting a…