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Modified Cosmology from Mass-to-Horizon Relation: Observational Bounds
Pranav Prasanthan, Hussain Gohar, Vincenzo Salzano
We constrain the class of modified cosmologies derived in Paper I [1] from a generalized mass-to-horizon relation (MHR) that enforces thermodynamic consistency between the Cai-Kim…
Modified Cosmology from Mass-to-Horizon Relation: Background Evolution
Pranav Prasanthan, Hussain Gohar, Vincenzo Salzano
We investigate the cosmological implications of the mass-to-horizon relation, which provides a unified framework for thermodynamically consistent generalized horizon-entropy functi…
Geometric acceleration in theories
Mikel Artola, Ismael Ayuso, Ruth Lazkoz +2
The framework of gravity enables the depiction of an effective dark energy fluid that emerges from geometry itself, thus leading to modifications in the cosmological pheno…
Testing non-local gravity through Ultra-Diffuse Galaxies kinematics
Filippo Bouchè, Salvatore Capozziello, Ciro De Simone +1
The emergence of the Ultra-Diffuse Galaxies in recent years has posed a severe challenge to the galaxy formation models as well as the Extended Theories of Gravity. The existence o…
A generalized mass-to-horizon relation: a new global approach to entropic cosmologies and its connection to CDM
Hussain Gohar, Vincenzo Salzano
In this letter, we propose a new generalized mass-to-horizon relation to be used in the context of entropic cosmologies and holographic principle scenarios. We show that a general…
On the foundations of entropic cosmologies: inconsistencies, possible solutions and dead end signs
Hussain Gohar, Vincenzo Salzano
In this letter we explore the foundations of entropic cosmology and highlight some important flaws which have emerged and adopted in the recent literature. We argue that, when appl…
DHOST gravity in Ultra-diffuse galaxies -- Part II: NGC 1052-DF4 and Dragonfly 44
Enrico Laudato, Vincenzo Salzano
Ultra-Diffuse galaxies are gravitational systems with quite varied properties. On one hand we have cases like DF2 and DF4, both observed by the Dragonfly Array Telescope, claimed t…
DHOST gravity in Ultra-diffuse galaxies -- Part I: the case of NGC1052-DF2
Enrico Laudato, Vincenzo Salzano
The Ultra-Diffuse galaxy NGC1052-DF2 has recently been under intense scrutiny because from its kinematics it has revealed to be "extremely deficient" in dark matter, if not lacking…
Testing non-local gravity by clusters of galaxies
Filippo Bouchè, Salvatore Capozziello, Vincenzo Salzano +1
Extended theories of gravity have been extensively investigated during the last thirty years, aiming at fixing infrared and ultraviolet shortcomings of General Relativity and of th…
Modified Gravity and Cosmology: An Update by the CANTATA Network
Emmanuel N. Saridakis, Ruth Lazkoz, Vincenzo Salzano +50
General Relativity and the CDM framework are currently the standard lore and constitute the concordance paradigm. Nevertheless, long-standing open theoretical issues, as well as…
Ricci cosmology in light of astronomical data
Roberto Caroli, Mariusz P. Dabrowski, Vincenzo Salzano
Recently, a new cosmological framework, dubbed Ricci Cosmology, has been proposed. Such a framework has emerged from the study of relativistic dynamics of fluids out of equilibrium…
Logarithmic corrections to Newtonian gravity and Large Scale Structure
Salvatore Capozziello, Mir Faizal, Mir Hameeda +2
Effects from nonstandard corrections to Newtonian gravity, at large scale, can be investigated using the cosmological structure formation. In particular, it is possible to show if…
Cosmological Constraints on Entropic Cosmology with Matter Creation
Hussain Gohar, Vincenzo Salzano
We investigate entropic force cosmological models with the possibility of matter creation and energy exchange between the bulk and the horizon of a homogeneous and an isotropic fla…
Cosmological constraints on the Generalized Uncertainty Principle from modified Friedmann equations
Serena Giardino, Vincenzo Salzano
The Generalized Uncertainty Principle (GUP) has emerged in numerous attempts to a theory of quantum gravity and predicts the existence of a minimum length in Nature. In this work,…
Observational constraints of gravity
Ruth Lazkoz, Francisco S. N. Lobo, María Ortiz-Baños +1
In this work, we consider an extension of symmetric teleparallel gravity, namely, gravity, where the fundamental block to describe spacetime is the nonmetricity, . Within…
Cosmological future singularities in interacting dark energy models
Jose Beltran Jimenez, Diego Rubiera-Garcia, Diego Saez-Gomez +1
The existence of interactions between dark matter and dark energy has been widely studied, since they can fit well the observational data and may provide new physics through such a…
Observational constraints on cosmological future singularities
Jose Beltran Jimenez, Ruth Lazkoz, Diego Saez-Gomez +1
In this work we consider a family of cosmological models featuring future singularities. This type of cosmological evolution is typical of dark energy models with an equation of st…