532 citations · 1.5k across the 28 of their papers we have counts for
21 papers · 1 filter
The CosmoVerse White Paper: Addressing observational tensions in cosmology with systematics and fundamental physics
Eleonora Di Valentino, Jackson Levi Said, Adam Riess +533
The standard model of cosmology has provided a good phenomenological description of a wide range of observations both at astrophysical and cosmological scales for several decades.…
Model-independent calibration of Gamma-Ray Bursts with neural networks
Purba Mukherjee, Maria Giovanna Dainotti, Konstantinos F. Dialektopoulos +2
The Cold Dark Matter (CDM) cosmological model has been highly successful in predicting cosmic structure and evolution, yet recent precision measurements have highlighted dis…
A possible late-time transition of inferred via neural networks
Purba Mukherjee, Konstantinos F. Dialektopoulos, Jackson Levi Said +1
The strengthening of tensions in the cosmological parameters has led to a reconsideration of fundamental aspects of standard cosmology. The tension in the Hubble constant can also…
Growth of structures using redshift space distortion in Cosmology
Rebecca Briffa, Celia Escamilla-Rivera, Jackson Levi Said +1
Cosmology faces a pressing challenge with the Hubble constant () tension, where the locally measured rate of the Universe's expansion does not align with predictions from the…
Strengthening extended Gravity constraints with combined systems: bounds from Cosmology and the Galactic Center
D. Benisty, J. Mifsud, J. Levi Said +1
Extended gravity is widely constrained in different astrophysical and astronomical systems. Since these different systems are based on different scales it is not trivial to get a c…
Neural Network Reconstruction of and its application in Teleparallel Gravity
Purba Mukherjee, Jackson Levi Said, Jurgen Mifsud
In this work, we explore the possibility of using artificial neural networks to impose constraints on teleparallel gravity and its extensions. We use the available Hubble pa…
On the Robustness of the Constancy of the Supernova Absolute Magnitude: Non-parametric Reconstruction \& Bayesian approaches
David Benisty, Jurgen Mifsud, Jackson Levi Said +1
In this work, we test the robustness of the constancy of the Supernova absolute magnitude using Non-parametric Reconstruction Techniques (NRT). We isolate the luminosity dist…
Neural Network Reconstruction of Late-Time Cosmology and Null Tests
Konstantinos Dialektopoulos, Jackson Levi Said, Jurgen Mifsud +2
The prospect of nonparametric reconstructions of cosmological parameters from observational data sets has been a popular topic in the literature for a number of years. This has mai…
Impact of priors on late time cosmology
Rebecca Briffa, Celia Escamilla-Rivera, Jackson Levi Said +1
We present a detailed analysis of the impact of priors from recent surveys in the literature on the late time cosmology of five cosmological models using cosmic chrono…
Spatial Curvature in Gravity
Christine R. Farrugia, Joseph Sultana, Jurgen Mifsud
In this work, we consider four gravity models -- the Hu-Sawicki, Starobinsky, Exponential and Tsujikawa models -- and use a range of cosmological data, together with Markov…
Performance of Non-Parametric Reconstruction Techniques in the Late-Time Universe
Celia Escamilla-Rivera, Jackson Levi Said, Jurgen Mifsud
In the context of a Hubble tension problem that is growing in its statistical significance, we reconsider the effectiveness of non-parametric reconstruction techniques which are in…
Reconstructing teleparallel gravity with cosmic structure growth and expansion rate data
Jackson Levi Said, Jurgen Mifsud, Joseph Sultana +1
In this work, we use a combined approach of Hubble parameter data together with redshift-space-distortion data, which together are used to reconstruct the teleparallel gra…
Cosmology with the Einstein Telescope: No Slip Gravity Model and Redshift Specifications
Ayan Mitra, Jurgen Mifsud, David F. Mota +1
The Einstein Telescope and other third generation interferometric detectors of gravitational waves are projected to be operational post . The cosmological signatures of gravi…
Testing the violation of the equivalence principle in the electromagnetic sector and its consequences in gravity
Jackson Levi Said, Jurgen Mifsud, David Parkinson +3
A violation of the distance-duality relation is directly linked with a temporal variation of the electromagnetic fine-structure constant. We consider a number of well-studied $f(T)…
Complementary probes of inflationary cosmology
Jurgen Mifsud, Carsten van de Bruck
A rigorous constraint analysis on cosmic inflation entails several probes which collectively survey an extensive range of energy scales. We complement the cosmic microwave backgrou…
An interacting dark sector and the first gravitational-wave standard siren detection
Jurgen Mifsud, Carsten van de Bruck
After the first nearly simultaneous joint observations of gravitational-waves and electromagnetic emission produced by the coalescence of a binary neutron star system, another prob…
Endowing with a dynamic nature: constraints in a spatially curved Universe
Christine R. Farrugia, Joseph Sultana, Jurgen Mifsud
In this study, we consider three dark energy models in which is not constant, but has a dynamic nature that depends on the Hubble parameter and/or its time derivative $\dot…
Searching for dark matter - dark energy interactions: going beyond the conformal case
Carsten van de Bruck, Jurgen Mifsud
We consider a generic cosmological model which allows for non-gravitational direct couplings between dark matter and dark energy. The distinguishing cosmological features of these…
Probing the imprints of generalized interacting dark energy on the growth of perturbations
Jurgen Mifsud, Carsten van de Bruck
We extensively study the evolution and distinct signatures of cosmological models, in which dark energy interacts directly with dark matter. We first focus on the imprints of these…
Testing coupled dark energy models with their cosmological background evolution
Carsten van de Bruck, Jurgen Mifsud, Jack Morrice
We consider a cosmology in which dark matter and a quintessence scalar field responsible for the acceleration of the Universe are allowed to interact. Allowing for both conformal a…
The variation of the fine-structure constant from disformal couplings
Carsten van de Bruck, Jurgen Mifsud, Nelson J. Nunes
We study a theory in which the electromagnetic field is disformally coupled to a scalar field, in addition to a usual non-minimal electromagnetic coupling. We show that disformal c…