Article
Physics, Particles & Fields
Serena Giardino, Vincenzo Salzano
Summary: This study explores cosmological models modified by the Generalized Uncertainty Principle (GUP) and compares them with observational data to derive constraints on the GUP parameter. It finds tighter constraints on the parameter in the quadratic formulation compared to astrophysical contexts, while the linear formulation appears to be incompatible with present cosmological data. The analysis underscores the important role of high-precision cosmological probes in quantum gravity phenomenology.
EUROPEAN PHYSICAL JOURNAL C
(2021)
Article
Physics, Particles & Fields
Genly Leon, Esteban Gonzalez, Samuel Lepe, Claudio Michea, Alfredo D. Millano
Summary: Scalar-field cosmologies with a generalized harmonic potential and matter are investigated in different metrics, with a focus on global results. Different attractors are found for Kantowski-Sachs and closed Friedmann-Lemaitre-Robertson-Walker metrics, and the importance of time-averaged system in determining future asymptotics is highlighted.
EUROPEAN PHYSICAL JOURNAL C
(2021)
Article
Physics, Particles & Fields
A. S. Lemos, F. A. Brito
Summary: The Generalized Uncertainty Principle (GUP) is studied in the context of the thick braneworld scenario. By considering Rydberg atoms, it is shown that the spacetime geometry influences the Maxwell equations, resulting in an effective dielectric constant. The gravitational interaction modifies the Coulomb potential, leading to a deviation in the 3-dimensional Bohr radius. The corrections to the fine structure constant due to the GUP in higher-dimensional spacetime are computed, and constraints on the deformation parameter beta and D-dimensional Planck length l(D) are found by comparing with empirical data.
EUROPEAN PHYSICAL JOURNAL C
(2023)
Article
Astronomy & Astrophysics
H. Mohammadi, A. Salehi
Summary: Inspired by the characteristics of Covid-19 and its impact on human cells, Barrow suggests that quantum gravitational effects could lead to complex and fractal properties on the black hole horizon. Using the Tsallis entropy formula, modified Friedmann equations describing the dynamics of the universe are derived. The Tsallis parameter q measures the level of nonextensivity or extensivity of a specific system. The modified geometry term caused by Barrow Tsallis entropy correction plays the role of dark energy, explaining the acceleration of the universe.
Article
Astronomy & Astrophysics
G. G. Luciano
Summary: We study the cosmological evolution of nonflat Friedmann-Robertson-Walker Universe with pressureless dark matter and Barrow holographic dark energy. We analyze the behavior of different model parameters and compare the observational consistency of interacting and noninteracting models. Our results show that the interacting model is favored by recent experimental constraints. The thermal stability of the model is also discussed.
Article
Physics, Particles & Fields
Zi-Yu Fu, Hui-Ling Li
Summary: This study investigates the influence of the generalized uncertainty principle on phase transitions of the Rutz-Schwarzschild black hole. By analyzing thermodynamic quantities and the generalized uncertainty parameter β, it is found that there are first-order and second-order phase transitions in the Finsler geometry framework, and that the generalized uncertainty parameter significantly affects the generation of black hole remnants.
Article
Physics, Mathematical
Ujjal Debnath
Summary: This passage discusses the FRW universe as a thermodynamical system, deriving the entropy-area relation and entropy function in different gravitational theories. It also presents the modified Friedmann equations on various IR cutoffs for Horava-Lifshitz gravity, scalar-tensor gravity, f(R) gravity, and f(T) gravity theories.
INTERNATIONAL JOURNAL OF GEOMETRIC METHODS IN MODERN PHYSICS
(2022)
Article
Physics, Particles & Fields
G. Lambiase, G. G. Luciano, A. Sheykhi
Summary: In this study, a new cosmological scenario is proposed based on Kaniadakis entropy and modified Friedmann equations. The research finds that the Kaniadakis parameter is constrained by observational limits and the correction term has a non-trivial effect on the growth of perturbations in the early stages of the Universe.
EUROPEAN PHYSICAL JOURNAL C
(2023)
Article
Nutrition & Dietetics
Chenyuan Wang, Shusen Li, Erna Sun, Ran Xiao, Ran Wang, Yimei Ren, Jingjing He, Qi Zhang, Jing Zhan
Summary: This study investigated the effects of fermented milk containing MN-Gup or MN-Gup-based synbiotics on high fat diet-induced obesity in rats. The interventions were found to alleviate obesity and inflammation, and regulate gut microbiota and microbial metabolites.
Article
Physics, Nuclear
Abdul Jawad, Sidra Saleem, Saba Qummer
Summary: This study examines an extra driving term for the flat universe using Sharma Mittal entropy and Padmanabhan's holographic equipartition law, resulting in the generation of additional acceleration in the acceleration equation. By investigating various cosmological parameters through graphical methods, the study finds consistent results with current observational data and validates the generalized second law of thermodynamics in both models.
INTERNATIONAL JOURNAL OF MODERN PHYSICS A
(2021)
Article
Mathematics, Applied
Marcelo Ebert, Jorge Marques
Summary: In this study, we investigate the nonlinear massless wave equation in the context of the Friedmann-Lemaitre-Robertson-Walker (FLRW) spacetime and establish the existence of global small data solutions for supercritical powers in a decelerating expansion universe.
MATHEMATICAL METHODS IN THE APPLIED SCIENCES
(2023)
Article
Astronomy & Astrophysics
Vijay Nenmeli, S. Shankaranarayanan, Vasil Todorinov, Saurya Das
Summary: This study utilizes the Generalized Uncertainty Principle to model features of quantum gravity and explores the applications of Stelle gravity in cosmology. It shows that Stelle gravity can be considered as a classical manifestation of maximum momentum and the GUP. Strong constraints on the GUP parameter are obtained from CMB observations, providing both lower and upper bounds.
Article
Mathematics, Applied
Danijela Brankovic
Summary: In this paper, we study the dynamics of the standard cosmological model filled with n non-interacting barotropic perfect fluids. We derive a dynamical system consisting of n nonlinear first-order differential equations, representing the density parameters of the material in the universe. The analytical solution of this system provides a new parametrization of density parameters. Additionally, we analyze the evolution of the universe using linear stability theory.
ANALELE STIINTIFICE ALE UNIVERSITATII OVIDIUS CONSTANTA-SERIA MATEMATICA
(2023)
Article
Astronomy & Astrophysics
Ashmita Das, Saurya Das, Noor R. Mansour, Elias C. Vagenas
Summary: Through the analysis of gravitational wave data from GW150914 and GW190521 events, bounds on GUP parameters for two versions were computed. The study calculated the speed of gravitons and photons in a curved spacetime modified by GUP, leading to constraints on the GUP parameters based on the difference in their speeds. These bounds represent some of the best results obtained in the context of quantum gravity phenomenology.
Article
Astronomy & Astrophysics
Ahmad Sheykhi
Summary: Barrow argued that quantum-gravitational effects may introduce fractal features on the black hole horizon and discussed the impact of Barrow entropy on cosmological equations, revealing modified Friedmann equations as well as examining the validity of the generalized second law of thermodynamics for the Universe enclosed by the apparent horizon.
Article
Physics, Multidisciplinary
Mir Faizal, Barun Majumder
Article
Physics, Multidisciplinary
Ahmed Farag Ali, Mir Faizal, Barun Majumder
Article
Physics, Mathematical
Ahmed Farag Ali, Mir Faizal, Barun Majumder, Ravi Mistry
INTERNATIONAL JOURNAL OF GEOMETRIC METHODS IN MODERN PHYSICS
(2015)
Article
Astronomy & Astrophysics
Barun Majumder, Kent Yagi, Nicolas Yunes
Article
Astronomy & Astrophysics
Narayan Banerjee, Barun Majumder
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