The bouncing cosmological model

Author: hbsb

August undefined, 2024

WebJan 20, 2024 · Here we have considered a bouncing cosmological model described by a given scale factor motivated from loop quantum gravity (LQG) and have studied the consequent dynamical behaviour of the model. Also, ρ c is a constant parameter that captures the quantum nature of the space-time. WebDec 5, 2024 · Additionally, bouncing cosmologies have the potential to rectify conceptual shortcomings identi ed in the theory of in ation, such as the singularity problem. In this paper we present a classical bouncing model in the context of modi ed gravity, including an R2-term in the action.

Bouncing Cosmologies

WebIn this section we consider the FLRW cosmological model. In that context, the universe can be approximated as composed by non-interacting constituents, each one being a perfect fluid with density , partial pressure and state equation , such that they add up to the total density and total pressure . [6] Let us now define the following functions: WebOct 12, 2024 · In this work we demonstrate that wormholes can in principle be naturally created during the cosmological bounce without the need for the exotic matter or any kind of additional modifications of the gravitational sector, apart from the one enabling the cosmological bounce. round qt

[2204.06210] Bouncing universe in Gauss-Bonnet gravity - arXiv.org

WebKaluza-Klein cosmological model has been obtained in the general theory of relativity. The source for energy-momentum tensor is assumed a perfect fluid. The field equations have been solved by using WebIn present study, bouncing cosmology in the context of theory of gravity is examined. For this purpose, a GB cosmological model with logarithmic trace term, i.e., ,is considered. In … WebThe theory could potentially explain why a repulsive form of energy known as the cosmological constant, which is accelerating the expansion of the universe, is several … round r2_score y_test y_pred 4

Quanta Magazine

WebFeb 15, 2024 · A bouncing cosmological scenario naturally avoids this singularity problem, although at the cost of having to introduce new physics to obtain the bounce. 2 A second challenge which the inflationary scenario faces is the … WebJan 25, 2024 · 4 Bouncing cosmological model Inflationary as well as bouncing models are of special interest in various gravity theories. In this section, we investigate the possibility … round qatarWebThe abundance of the most massive objects in the Universe at different epochs is a very sensitive probe of the cosmic background evolution and of the growth history of density perturbations, and could provide a powerfu… round r2d2

"WebAug 9, 2024 · A new study by physicists highlights one way that cyclic or 'bouncing' cosmologies fall flat. 'People proposed bouncing universes to make the universe infinite into the past, but what we show... " - The bouncing cosmological model

The bouncing cosmological model

Bouncing scenario with causal cosmology SpringerLink

WebMar 12, 2024 · We analyze the causal structure of McVittie spacetime for a classical bouncing cosmological model. In particular, we compute the trapping horizons of the … WebA bounce cosmology in f (R) cosmological settings was reported in , where it was observed that the bouncing point is characterized by a type-IV singularity. In another interesting study, Odintsov and Oikonomou [ 50 ] provided an f ( R ) gravity description of a Λ CDM bouncing model without depending on any matter fluid or cosmological constant.

Did you know?

WebMar 6, 2024 · Bouncing Cosmology made simple Anna Ijjas, Paul J. Steinhardt We introduce the "wedge diagram," an intuitive way to illustrate how cosmological models with a classical (non-singular) bounce … WebApr 13, 2024 · In this paper, a bouncing cosmological scenario is studied in the background of a flat FLRW model with a specific parametrized hyperbolic form of scale factor in terms of , where is taken as the model parameter. This model is discussed in formalism having structured as , where is Ricci scalar and is the Gauss-Bonnet invariant.

WebDec 1, 2016 · @article{osti_22679374, title = {Possible evolution of a bouncing universe in cosmological models with non-minimally coupled scalar fields}, author = {Pozdeeva, Ekaterina O. and Vernov, Sergey Yu. and Skugoreva, Maria A. and Toporensky, Alexey V., E-mail: [email protected], E-mail: [email protected], E-mail: … WebMar 14, 2024 · It was a cosmological model of motionless matter, having positively curved spatial sections (so had a finite volume but no boundary) and an added repulsive force (dependent on the cosmological constant) balancing the attractive gravitational force, resulting in a static world.

WebJun 1, 2024 · The tantalizing possibility of having a cosmological scenario with all the properties above is strong motivation for exploring classical (non-singular) bouncing … WebAug 5, 2024 · The bouncing model is investigated in the presence of Tsallis Holographic Dark energy (THDE), Rényi Holographic Dark energy (RHDE), and Sharma-Mittal …

Web1 day ago · The exact bouncing solutions with physical analysis are provided with the choice of two equation of state parameters. It is shown that the results do agree with the present values of deceleration, jerk and snap parameters.

WebA modified Chaplygin Gas (mCG) model was proposed by Debnath et al. [81] where isotropous pressure p of the cosmological fluid adheres to B p = Aρ − α , (2) ρ and 0 6 A 6 1, 0 6 α 6 1 and B is a positive constant. round r 2WebMar 10, 2015 · Abstract The purpose of this short review is to describe cosmological models with a linear inhomogeneous time-dependent equation of state (EoS) for the dark energy, when the dark fluid is coupled... strawberry cowboy coolerWebApr 20, 2024 · The bouncing cosmological model. Plasma, or electric universe theory. The black hole origin theory. ... The oscillating universe theory is a cosmological model that states that the universe experiences self-regulating, indefinite cycles of expansion and contraction. These culminate in a “Big Bang” and “Big Crunch”, meaning we are ... strawberry cow drawings realisticWebKaluza-Klein cosmological model has been obtained in the general theory of relativity. The source for energy-momentum tensor is assumed a perfect fluid. The field equations have … round r6+r10-r15*1.15 2WebNov 2, 2024 · In this paper, we have presented a bouncing cosmological model of the Universe in an extended theory of gravity. The dynamical behaviour of the model obtained from the flat FLRW space‐time along with the violation of null energy condition have been shown. The geometrical parameters show singularity behaviour at the bouncing epoch. … strawberry cow fanartWebJul 26, 2024 · In this paper, in an extended theory of gravity, we have presented bouncing cosmological model at the backdrop of an isotropic, homogeneous space-time, in the … strawberry cow codes bloxburgWebJan 1, 2005 · Request PDF Bouncing Cosmological Models:. Theory and Perspectives In the past few years, there has been an increasing interest on bouncing cosmological models. strawberry cow cursor