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Friedmann–Lemaître–Robertson–Walker metric
About: Friedmann–Lemaître–Robertson–Walker metric is a research topic. Over the lifetime, 4113 publications have been published within this topic receiving 87752 citations. The topic is also known as: FLRW metric.
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TL;DR: In this paper, the authors generalize the notion of constant-roll inflation earlier introduced in General Relativity (GR) and $f(R)$ gravity to inflationary models in more general scalar-tensor gravity.
Abstract: We generalize the notion of constant-roll inflation earlier introduced in General Relativity (GR) and $f(R)$ gravity to inflationary models in more general scalar-tensor gravity. A number of novel exact analytic solutions for a FLRW spatially flat cosmological background is found for this case. All forms of the scalar field potential and its coupling to gravity producing the exact de Sitter solution, while the scalar field is varying, are presented. In the particular cases of induced gravity and GR with a non-minimally coupled scalar field, all constant-roll inflationary solutions are found. In the former case they represent power-law inflation, while in the latter case the solution is novel and more complicated. Comparison of scalar perturbations generated during such inflation in induced gravity with observational data shows that the constant-roll parameter should be small, similar to constant-roll inflation in GR and $f(R)$ gravity. Then the solution reduces to the standard slow-roll one with small corrections.
42 citations
TL;DR: In this article, the authors considered the flat FRW universe with interacting dark energy models and cold dark matter within the framework of DGP braneworld and explored the different cosmological quantities like the equation of state parameter, deceleration parameter, squared speed of sound, statefinder parameters, ω − ω ′ plane and Om diagnostic.
42 citations
TL;DR: In this article, a non-interacting model of Barrow holographic dark energy (BHDE) using Barrow entropy in a spatially flat FLRW Universe considering the IR cutoff as the Hubble horizon was proposed.
Abstract: In this work, we propose a non-interacting model of Barrow holographic dark energy (BHDE) using Barrow entropy in a spatially flat FLRW Universe considering the IR cutoff as the Hubble horizon. We study the evolutionary history of important cosmological parameters, in particular, EoS $(\omega_{B})$, deceleration parameter and, the BHDE and matter density parameter and also observe satisfactory behaviours in the BHDE the model. In addition, to describe the accelerated expansion of the Universe the correspondence of the BHDE model with the quintessence scalar field has been reconstructed.
42 citations
TL;DR: In this article, a general dynamical equation of FRW universe filled with a perfect fluid was derived by considering a generic form of the entropy as a function of area. And the modified Raychaudhuri equation due to GUP in emergence of cosmic space framework and investigate it using fixed point method.
42 citations
TL;DR: In this article, exact solutions for a Friedmann-Lema-tre-Robsertson-Walker (FLRW) universe in a generalized hybrid metric-Palatini theory were obtained by either making an ansatz on the scale factor or on the effective potential.
Abstract: We construct exact solutions representing a Friedmann-Lema\^{\i}tre-Robsertson-Walker (FLRW) universe in a generalized hybrid metric-Palatini theory. By writing the gravitational action in a scalar-tensor representation, the new solutions are obtained by either making an ansatz on the scale factor or on the effective potential. Among other relevant results, we show that it is possible to obtain exponentially expanding solutions for flat universes even when the cosmology is not purely vacuum. We then derive the classes of actions for the original theory which generate these solutions.
42 citations