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Stability Properties of Geometrothermodynamic Cosmological Models [PDF]
Entropy, 2023 We consider a particular isotropic and homogeneous cosmological model, in which the equation of state is obtained from a thermodynamic fundamental equation by using the formalism of geometrothermodynamics (GTD).
Nurzada Beissen +5 more
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FLRW Cosmological Models with Dynamic Cosmological Term in Modified Gravity
Universe, 2021 Although the standard lambda cold dark matter cosmological model is quite successful in describing the universe, there are still several issues that are still not resolved.
Rishi Kumar Tiwari +2 more
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Singularities in Inflationary Cosmological Models
Universe, 2021 Due to the accelerated expansion of the universe, the possibilities for the formation of singularities has changed from the classical Big Bang and Big Crunch singularities to include a number of new scenarios. In recent papers it has been shown that such
Leonardo Fernández-Jambrina
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Cosmological models and stability [PDF]
, 2014 Principles in the form of heuristic guidelines or generally accepted dogma play an important role in the development of physical theories. In particular, philosophical considerations and principles figure prominently in the work of Albert Einstein.
Lars Andersson, Andersson, L.
core +4 more sources
Kantowski–Sachs cosmological models approaching isotropy
Journal of Mathematical Physics, 1984 In this article we analyze a particular class of anisotropic cosmological models, the Kantowski–Sachs models, in the presence of a nonzero cosmological constant Λ.
Edmond Weber, Weber, Edmond
exaly +2 more sources
The cosmological models with jump discontinuities
European Physical Journal C: Particles and Fields, 2018 The article is dedicated to one of the most undeservedly overlooked properties of the cosmological models: the behaviour at, near and due to a jump discontinuity.
Artyom Yurov +2 more
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Metaphysics of cosmological models
HTS Teologiese Studies/Theological Studies, 2023 This article aims to address the metaphysical dimension of cosmological models, be they mythological, philosophical, religious or modern scientific, using multidisciplinary and transdisciplinary methodology.
Vasile Chira
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The Astrophysical Journal, 2023 We propose a model of the Universe (dubbed η CDM) featuring a controlled stochastic evolution of the cosmological quantities that is meant to render the effects of small deviations from homogeneity/isotropy on scales of 30–50 h ^−1 Mpc at late cosmic ...
Andrea Lapi +6 more
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Stability Of Cosmological Models [PDF]
Symposium - International Astronomical Union, 1995 The stability problem in cosmology is studied using the equations of geodesic deviation. General conditions for stability are obtained. The method is applied to a number of cosmological models, resulting from different field theories. The results are compared with those obtained from FRW -models.
Wanas, M. I., Bakry, M. A.
openaire +2 more sources
Cosmological Constant from Boundary Condition and Its Implications beyond the Standard Model
Universe, 2023 Standard cosmology has long been plagued by a number of persistent problems. The origin of the apparent acceleration of the cosmic expansion remains enigmatic.
Jan O. Stenflo
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