Explanipedia

Generalized nonextensive entropy holographic dark energy models verified by cosmological data Open

Ilim Çimdiker, Mariusz P. Da̧browski, Vincenzo Salzano · 2025

We present a general formalism for studying generalized Holographic Dark Energy (HDE) models in which we use a dimensionless form of the area-entropy of cosmological horizons. The future event horizon is applied though the formalism can al…

Look Beyond Additivity and Extensivity of Entropy for Black Hole and Cosmological Horizons Open

Mariusz P. Da̧browski · 2024

We present a comparative analysis of the plethora of nonextensive and/or nonadditive entropies which go beyond the standard Boltzmann–Gibbs formulation. After defining the basic notions of additivity, extensivity, and composability, we dis…

Look beyond additivity and extensivity of entropy for black hole and cosmological horizons Open

Mariusz P. Da̧browski · 2024

We present a comparative analysis of the plethora of nonextensive and/or nonadditive entropies which go beyond the standard Boltzmann-Gibbs formulation. After defining the basic notions of additivity, extensivity, and composability, we dis…

Beyond Additivity and Extensivity of Entropy for Black Hole and Cosmological Horizons Open

Mariusz P. Da̧browski · 2024

The extensions of Boltzmann-Gibbs classical entropic form are presented. The focus is on the thermodynamical entropies which do not obey classical definition of additivity and extensity with main motivation coming from the gravitational sy…

Concept of the polish high temperature gas-cooled reactor HTGR-POLA Open

Mariusz P. Da̧browski, A. L. Boettcher, Wojciech Brudek, Janusz Malesa, Dominik Muszyński , et al. · 2024

Through a series of national and international projects (HTR-PL, GEMINI Plus, GOSPOSTRATEG-HTR), the National Centre for Nuclear Research (NCBJ), Świerk, Poland, got involved into design of the small-scale High Temperature Gas-cooled React…

Generalized uncertainty principle impact on nonextensive black hole thermodynamics Open

Ilim Çimdiker, Mariusz P. Da̧browski, Hussain Gohar · 2023

The effect of the generalized uncertainty principle (GUP) on nonextensive thermodynamics applied to black holes, as well as the sparsity of the radiation at different temperatures associated with each nonextensive entropy, is investigated.…

Barrow nearly-extensive Gibbs-like entropy favoured by the full dynamical and geometrical data set in cosmology Open

Tomasz Denkiewicz, Vincenzo Salzano, Mariusz P. Da̧browski · 2023

We apply the full set of most update dynamical and geometrical data in cosmology to the nonextensive Barrow entropic holographic dark energy. We show that the data point towards an extensive Gibbs-like entropic behaviour for the cosmologic…

Equilibrium temperature for black holes with nonextensive entropy Open

Ilim Çimdiker, Mariusz P. Da̧browski, Hussain Gohar · 2023

Hawking temperature has been widely utilized in the literature as the temperature that corresponds to various nonextensive entropies. In this study, we analyze the compatibility of the Hawking temperature with the nonextensive entropies. W…

Generalized Uncertainty Principle Impact on Nonextensive Black Hole Thermodynamics Open

Ilim Cimidiker, Mariusz P. Da̧browski, Hussain Gohar · 2023

The effect of the generalized uncertainty principle (GUP) on nonextensive thermodynamics applied to black holes, as well as the sparsity of the radiation at different temperatures associated with each nonextensive entropy, is investigated.…

Observational imprints of our lost twin anti-universe Open

Samuel Barroso Bellido, Mariusz P. Da̧browski · 2022

Equilibrium Temperature for Black Holes with Nonextensive Entropy Open

Ilim Çimdiker, Mariusz P. Da̧browski, Hussain Gohar · 2022

Hawking temperature has been widely utilised in the literature as the temperature that corresponds to various nonextensive entropies. In this study, we analyze the compatibility of the Hawking temperature with the nonextensive entropies. W…

Pre-Conceptual Design of the Research High-Temperature Gas-Cooled Reactor TeResa for Non-Electrical Applications Open

Eleonora Skrzypek, Dominik Muszyński, Maciej Skrzypek, Piotr Darnowski, Janusz Malesa , et al. · 2022

In line with Polish national activities and research programs investigating non-electrical-reactor use, the national GOSPOSTRATEG-HTR project was launched, aiming at the development of a novel pre-conceptual design of a High-Temperature Ga…

Observational Imprints of Our Lost Twin Anti-Universe Open

Samuel Barroso Bellido, Mariusz P. Da̧browski · 2022

We consider observational consequences of the entanglement between our universe and a hypothetical twin anti-universe in the third quantization scheme of the canonical quantum gravity. Based on our previous investigations we select some sp…

Bezpieczeństwo ruchu drogowego w zakresie zdarzeń drogowych z udziałem pojazdów autobusowej komunikacji publicznej Open

Grzegorz Gudzbeler, Mariusz Nepelski, Alicja Bortkiewicz, prof. dr hab. Andrzej Misiuk, Mariusz P. Da̧browski · 2021

Bezpieczeństwo ruchu drogowego, w tym zmniejszenie liczby zdarzeń drogowych i ofiar, w szczególności śmiertelnych, jest jednym z priorytetów państw na całym świecie. Wskazaną problematykę na poziomie państw narodowych monitorują odpowiedni…

Ricci cosmology in light of astronomical data Open

Roberto Caroli, Mariusz P. Da̧browski, Vincenzo Salzano · 2021

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 in a curved background and is characterised by the presenc…

Entanglement entropy at critical points of classical evolution in oscillatory and exotic singularity multiverse models Open

Adam Balcerzak, Samuel Barroso Bellido, Mariusz P. Da̧browski, Salvador Robles-Pérez · 2021

Using the 3rd quantization formalism we study the quantum entanglement of\nuniverses created in pairs within the framework of standard homogeneous and\nisotropic cosmology. In particular, we investigate entanglement quantities\n(entropy, t…

Nonextensive black hole entropy and quantum gravity effects at the last stages of evaporation Open

Ana Alonso-Serrano, Mariusz P. Da̧browski, Hussain Gohar · 2021

We analyze the Generalized Uncertainty Principle (GUP) impact onto the\nnonextensive black hole thermodynamics by using R\\'enyi entropy. We show that\nwhen introducing GUP effects, both R\\'enyi entropy and temperature associated\nto blac…

Geometrical observational bounds on a fractal horizon holographic dark energy Open

Mariusz P. Da̧browski, Vincenzo Salzano · 2020

A novel fractal structure for the cosmological horizon, inspired by COVID-19\ngeometry, which results in a modified area entropy, is applied to cosmology in\norder to serve dark energy. The constraints based on a complete set of\nobservati…

Asymptotic generalized extended uncertainty principle Open

Mariusz P. Da̧browski, Fabian Wagner · 2020

We present a formalism which allows for the perturbative derivation of the Extended Uncertainty Principle (EUP) for arbitrary spatial curvature models and observers. Entering the realm of small position uncertainties, we derive a general a…

The Multiverse Open

Ana Alonso-Serrano, Mariusz P. Da̧browski, T. Naumann · 2020

The multiverse is a concept that acknowledges the existence of a multiplicity of worlds or universes. The designs of these universes do not have to be the same as our universe, but we have no clear view of what the “other” designs might be…

Asymptotic Generalized Extended Uncertainty Principle Open

Mariusz P. Da̧browski, Fabian Wagner · 2020

We present a formalism which allows for the perturbative derivation of the Extended Uncertainty Principle (EUP) for arbitrary spatial curvature models and observers. Entering the realm of small position uncertainties, we derive a general a…

Four direct measurements of the fine-structure constant 13 billion years ago Open

Michael R. Wilczynska, John K. Webb, Matthew Bainbridge, Sarah E. I. Bosman, John D. Barrow , et al. · 2020

Fine-structure constant measurements 13 Ga ago, plus lower redshift data, test space-time variation of a fundamental constant.

Four direct measurements of the fine-structure constant 13 billion years\n ago Open

Michael R. Wilczynska, John K. Webb, Matthew Bainbridge, Sarah E. I. Bosman, John D. Barrow , et al. · 2020

Observations of the redshift z=7.085 quasar J1120+0641 have been used to\nsearch for variations of the fine structure constant, alpha, over the redshift\nrange 5.5 to 7.1. Observations at z=7.1 probe the physics of the universe when\nit wa…

Post-Editorial of “The Multiverse” Special Volume Open

Ana Alonso-Serrano, Mariusz P. Da̧browski, T. Naumann · 2020

A succesful series of papers devoted to various aspects of an idea of the Multiverse have been gathered together and presented to the readers. In this post-editorial we briefly challenge the content referring to the main issues dealt with …

Extended uncertainty principle for rindler and cosmological horizons Open

Mariusz P. Da̧browski, Fabian Wagner · 2019

\n We find exact formulas for the Extended Uncertainty Principle (EUP) for the Rindler and Friedmann horizons and show that they can be expanded to obtain asymptotic forms known from the previous literature. We calculate the corrections to…

Extended Uncertainty Principle for Rindler and cosmological horizons Open

Mariusz P. Da̧browski, Fabian Wagner · 2019

We find exact formulas for the Extended Uncertainty Principle (EUP) for the Rindler and Friedmann horizons and show that they can be expanded to obtain asymptotic forms known from the previous literature. We calculate the corrections to Ha…

NEUTRON PHYSICAL FEASIBILITY OF SMALL MODULAR DESIGN OF DUAL FLUID REACTOR Open

Xiang Wang, Qian Zhang, Xun He, Zhuoqi Du, Marcus Seidl , et al. · 2019

The Dual Fluid Reactor (DFR) is a fast reactor concept proposed by the Institute of Solid-state- and Nuclear physics (IFK) in Berlin. The design of DFR aims to combine the GenIV Molten Salt Reactor (MSR) and the Liquid-Metal Cooled Reactor…

Non-exotic conformal structure of weak exotic singularities Open

Mariusz P. Da̧browski, Konrad Marosek · 2018

Minimal length and the flow of entropy from black holes Open

Ana Alonso-Serrano, Mariusz P. Da̧browski, Hussain Gohar · 2018

The existence of a minimal length, predicted by different theories of quantum gravity, can be phenomenologically described in terms of a generalized uncertainty principle. We consider the impact of this quantum gravity motivated effect ont…

Cosmology in a toy model of Lorentz breaking gravity Open

A. Nilsson, Mariusz P. Da̧browski · 2018

We explore cosmological solutions to Lorentz breaking gravity using the gravitational sector of the Standard Model Extension (SME). By using a simple toy model for Lorentz violation and under the assumption that the so-called $\mathfrak{T}…

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