299 citations · 724 across the 35 of their papers we have counts for
35 papers
White dwarfs in minimal dilatonic gravity
Denitsa Staicova
We study static, spherically symmetric white dwarfs in minimal dilatonic gravity (MDG) -- a Brans-Dicke theory with fixed coupling and free Compton length . Solving…
Reconstructing the Type Ia Supernova Absolute Magnitude with Two-Probe Physics-Informed Neural Networks
Denitsa Staicova
We apply two variants of Physics-Informed Neural Networks (PINNs) to reconstruct the Type~Ia supernova absolute magnitude from joint BAO and supernova data under four cosm…
Statistical Nuances in BAO Analysis: Likelihood Formulations and Non-Gaussianities
Denitsa Staicova
We present a systematic comparison of statistical approaches to Baryon Acoustic Oscillation (BAO) analysis using DESI DR2 data. We evaluate four methods for handling the nuisance p…
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.…
Electromagnetic Waves in Cosmological Space-Time II. Luminosity Distance
Denitsa Staicova, Michail Stoilov
In this article, we continue our investigation on how the electromagnetic waves propagate in the Friedman-Lemaitre-Robertson-Walker spacetime. Unlike the standard approach, which r…
Modern Bayesian Sampling Methods for Cosmological Inference: A Comparative Study
Denitsa Staicova
We present a comprehensive comparison of different Markov Chain Monte Carlo (MCMC) sampling methods, evaluating their performance on both standard test problems and cosmological pa…
Studying the Supernova Absolute Magnitude Constancy with Baryonic Acoustic Oscillations
Denitsa Staicova
In this proceeding we review and expand on our recent work investigating the constancy of the absolute magnitude of Type Ia supernovae. In it, we used baryonic acoustic oscil…
Late-Time constraints on Interacting Dark Energy: Analysis independent of , and
David Benisty, Supriya Pan, Denitsa Staicova +2
We investigated a possible interaction between cold dark matter and dark energy, corresponding to a well-known interacting dark energy model discussed in the literature within the…
Probing for Lorentz Invariance Violation in Pantheon Plus Dominated Cosmology
Denitsa Staicova
The Hubble tension in cosmology is not showing signs of alleviation and thus, it is important to look for alternative approaches to it. One such example would be the eventual detec…
Dark Energy as a Critical Period in Binary Motion: Bounds from Multi-scale Binaries
David Benisty, Jenny Wagner, Denitsa Staicova
The two-body problem under the influence of both dark energy and post-Newtonian modifications is studied. In this unified framework, we demonstrate that dark energy plays the role…
Impact of Cosmology on Lorentz Invariance Violation Constraints from GRB Time-Delays
Denitsa Staicova
Putting constraints on a possible Lorentz Invariance Violation (LIV) from astrophysical sources such as gamma-ray bursts (GRBs) is essential for finding evidences of new theories o…
Model selection results from different BAO datasets -- DE models and CDM
Denitsa Staicova
The use of the baryonic acoustic oscillations (BAO) datasets offers a unique opportunity to connect the early universe and the late one. In this proceeding, we discuss recent resul…
DE models with combined from BAO and CMB dataset and friends
Denitsa Staicova
It has been theorized that Dynamical Dark Energy (DDE) could be a possible solution to the Hubble tension. To avoid the degeneracy between the Hubble parameter and the sound…
Report of the Topical Group on Cosmic Probes of Fundamental Physics for for Snowmass 2021
Rana X. Adhikari, Luis A. Anchordoqui, Ke Fang +118
Cosmic Probes of Fundamental Physics take two primary forms: Very high energy particles (cosmic rays, neutrinos, and gamma rays) and gravitational waves. Already today, these probe…
Cosmology Intertwined: A Review of the Particle Physics, Astrophysics, and Cosmology Associated with the Cosmological Tensions and Anomalies
Elcio Abdalla, Guillermo Franco Abellán, Amin Aboubrahim +200
In this paper we will list a few important goals that need to be addressed in the next decade, also taking into account the current discordances between the different cosmological…
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…
Hints of the tension in uncorrelated Baryon Acoustic Oscillations dataset
Denitsa Staicova
Baryon Acoustic Oscillations (BAO) datasets use very precise measurements of the spatial distribution of large-scale structures as a distance ladder to help constrain cosmological…
Constraining the dark energy models using Baryon Acoustic Oscillations: An approach independent of
Denitsa Staicova, David Benisty
The tension and the accompanying tension are a hot topic in current cosmology. In order to remove the degeneracy between the Hubble parameter and the sound horizo…
Special cases of the Multi-Measure Model -- understanding the prolonged inflation
Denitsa Staicova
The multi-measure model (MMM), in which one modifies the action to include both the Riemannian measure and a non-Riemannian one, has proven to be able to produce viable Universe ev…
Testing Late Time Cosmic Acceleration with uncorrelated Baryon Acoustic Oscillations dataset
David Benisty, Denitsa Staicova
Baryon Acoustic Oscillations (BAO) involve measuring the spatial distribution of galaxies to determine the growth rate of cosmic structure. We derive constraints on cosmological pa…
The role of the slope in the the multi-measure cosmological model
Denitsa Staicova
In this work, we report some results on the numerical exploration of the model of Guendelman-Nissimov-Pacheva. This model has been previously applied to cosmology, but there were o…
Cosmology from multimeasure multifield model
Denitsa Staicova, Michail Stoilov
We consider the cosmological application of a (variant of) relatively newly proposed model \cite{1609.06915} unifying inflation, dark energy, dark matter, and the Higgs mechanism.…
The multi-measure cosmological model and its peculiar effective potential
Denitsa Staicova
The multi-measures model applied to cosmology has been recently shown to reproduce qualitatively the expected stages of the Universe evolution, along with some unexpected features.…
Cosmological Solutions from a Multi-Measure Model with Inflaton Field
Denitsa Staicova, Michail Stoilov
In a recent work, we demonstrated that a modified gravity model in which a scalar "darkon" field is coupled to both the standard Riemannian metric and to another non-Riemannian vol…