Cosmic jerk and snap in Penrose’s CCC model
نویسندگان
چکیده
منابع مشابه
Cosmic Jerk, Snap and Beyond
We clarify the procedure for expressing the Friedmann equation in terms of directly measurable cosmological scalars constructed out of higher derivatives of the scale factor. We carry out this procedure for pure dust, Chaplygin gas and generalised Chaplygin gas energy–momentum tensors. In each case it leads to a constraint on the scalars thus giving rise to a test of General Relativity. We also...
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Taylor expanding the cosmological equation of state around the current epoch p = p0 + κ0(ρ − ρ0) + 1 2 d2p dρ2 ∣∣∣ 0 (ρ − ρ0) + O[(ρ − ρ0)], is the simplest model one can consider that does not make any a priori restrictions on the nature of the cosmological fluid. Most popular cosmological models attempt to be ‘predictive’, in the sense that once some a priori equation of state is chosen the F...
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Chaos in a fractional-order jerk model using hyperbolic tangent nonlinearity is presented. A fractional integrator in the model is approximated by linear transfer function approximation in the frequency domain. Resulting chaotic attractors are demonstrated with the system orders as low as 2.1.
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We want to study the perturbation growth of an initial seed of an ellipsoidal shape in Top-Hat collapse model of the structure formation in the Modied Chaplygin gas cosmology. Considering reasonable values of the constants and the parameters of the model under study, we can show that a very small deviation from spherical symmetry (ellipsoidal geometry) in the initial seed leads to a nal highly ...
متن کاملCCC v4n3
Submitted: Apr 9, 2004; Revised: Jul 19, 2004; Accepted: Jul 19, 2004 Address for correspondence: Robert Diasio, MD, University of Alabama at Birmingham, Department of Pharmacology and Toxicology and UAB Comprehensive Cancer Center, 1824 6th Ave S, Wallace Tumor Institute, Room 620, University of Alabama at Birmingham, Birmingham, AL 35294-3300 Fax: 205-975-5650; e-mail: [email protected]...
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ژورنال
عنوان ژورنال: General Relativity and Gravitation
سال: 2014
ISSN: 0001-7701,1572-9532
DOI: 10.1007/s10714-014-1814-z