Bouncing cosmology

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August undefined, 2024

WebBouncing cosmology in extended gravity and its reconstruction as dark energy model A. S. Agrawal , Francisco Tello-Ortiz y, B. Mishra z, S.K. Tripathy x Abstract: 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 at FLRW WebMay 31, 2014 · Second, we can search for new cosmological signatures as a way to explore physics beyond the standard cosmic paradigm. In particular, a subset of early universe models admit a nonsingular bouncing solution that attempts to address the issue of the big bang singularity.

Exploring bouncing cosmologies with cosmological surveys

WebNov 10, 2024 · We present a model for a classical, non-singular bouncing cosmology without violation of the null energy condition (NEC). The field content is General Relativity plus a real scalar field with a canonical kinetic term and only renormalizable, polynomial type self-interaction for the scalar field in the Jordan frame. WebJun 11, 2012 · The non-singular bouncing cosmology is an alternative paradigm to inflation, wherein the background energy density vanishes at the bounce point, in the context of Einstein gravity. nintendo switch megadrive

What If the Big Bang Wasn

WebJun 1, 2024 · Bouncing cosmologies In this section, we have considered three different scale factors that show bouncing behavior at some epochs. The bouncing nature of these scale factors are discussed. Also, we derive the dynamical properties such as the deceleration parameter and the EOS parameter for these models. Stability analysis WebJun 1, 2024 · In fact, not only the bounce, but the entire background evolution of these geodesically complete cosmological scenarios is described to leading order by classical … Webthan the time scale of the bouncing phase, both the amplitude and the shape of the power spectrum of primordial curvature pertur-bations can remain unchanged through the bouncing point due to a no-go theorem [36,37]. A challenge that the matter bounce cosmology has to address is how to obtain a slightly red tilt on nintendo switch membership canada

Exploring bouncing cosmologies with cosmological surveys

[2011.05133] A classical, non-singular, bouncing universe - arXiv.org

WebJul 11, 2016 · Another model called loop quantum cosmology also showed signs of giving similar bouncing universes, but things got messy once they dug into the details. “My experience with loop quantum ... Webby Cai et al. [18] and Brandenberger et al. [19] explaining the nonsingular phenomenon of bouncing cosmology. In their work, they used cosmological models on the Galileon theory to study some important features of the bouncing cosmology. For the description of early universe by a cosmological model, the matter bounce scenario is recognized [20]. In number of chromosomes in liver cellWebFeb 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 … number of chromosomes in prokaryotes

"Webto bouncing cosmology that we will consider here. These theories are based on more ordi-nary elements—three spatial dimensions, scalar fields and, most importantly, a non … " - Bouncing cosmology

Bouncing cosmology

Bouncing behaviours in four dimensional Einstein Gauss

WebA nonsingular bouncing cosmology can be achieved by introducing a fermion field with BCS condensation occurring at high energy scales. In this paper we are able to dilute the anisotropic stress near the bounce by means… WebBouncing cosmology in an extended theory of gravity Sunil Kumar Tripathya, Rakesh Kumar Khuntiab, and Priyabrata Paridac ... The non-singular bouncing models also favour a late time cosmic speed up phenomenon. The dynamical behaviour of the equation of state parameter is studied for the models. It is

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WebAug 1, 2024 · A bouncing universe is a viable candidate to solve the initial singularity problem. Here we consider bouncing solutions in the context of gravity by using an order reduction technique which allows one to find solutions that are perturbatively close to General Relativity. This procedure also acts as a model selection approach. WebHis research spans problems in particle physics, astrophysics, cosmology, condensed matter physics and geophysics. He is one of the architects of the inflationary theory. More recently, he proposed the "ekpyrotic model" of …

WebMay 31, 2014 · Second, we can search for new cosmological signatures as a way to explore physics beyond the standard cosmic paradigm. In particular, a subset of early universe … WebFeb 24, 2024 · This manuscript is based on an investigation of bouncing cosmology in a 4D Einstein Gauss-Bonnet gravity. Various bouncing models such as symmetric bounce, matter bounce, super bounce, and oscillatory bounce have been examined. Expressions for energy density, pressure, equation of state parameter have been derived in the most …

WebFeb 28, 2024 · The main difficulties in constructing a viable early Universe bouncing model are: to bypass the observational and theoretical no-go theorem, to construct a stable non … WebDec 5, 2024 · His model includes a concept known as bouncing cosmology. The concept first appeared at least 40 years ago, and it agrees that the universe is expanding, but …

WebCosmology with a Bounce A targeted grant of the Simons Foundation to support the development of new theories of the origin, evolution, and future of the universe based on replacing the big bang with a bounce, a …

WebJul 30, 2024 · The aim of this paper is to probe the features of the bouncing cosmology with the current observational data. Basing on bounce inflation model, with high derivative term, we propose a general parametrization of primordial power spectrum which includes the typical bouncing parameters, such as bouncing time-scale, and energy scale. By … nintendo switch melatoninWebFeb 14, 2024 · Model of a Bouncing Cosmology . The Universe goes through an initial matter-subjugated reduction phase in the bouncing state, which is monitored by a non-singular bounce, as detailed in [51-58]. number of chromosomes in roseWebKaluza-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 nintendo switch mega man legacyWebMar 6, 2024 · Bouncing Cosmology made simple. We introduce the "wedge diagram," an intuitive way to illustrate how cosmological … nintendo switch melectronicsWebA bouncing cosmology is an alternative to inflation that can produce a curvature power spectrum that is scale invariant and the bouncing scenario leads to non-singular universe evolution [92–102]. In the scenario of matter bouncing, the universe experiences a matter-dominated period with the onset of the contraction. number of chromosomes in primatesWebJun 27, 2024 · According to their idea, called bouncing cosmology, the universe was born not just once, but possibly multiple times in endless cycles of contraction and expansion. The theory replaces the "big ... number of chromosomes in secondary oocyteWebBouncing Cosmology made simple arXiv:1803.01961 Abstract. We introduce the "wedge diagram," an intuitive way to illustrate how cosmological models with a classical (non … number of chromosomes in rice