Quick search Find article
Quick search
Find article

Cosmic jerk, snap and beyond

Maciej Dunajski and Gary Gibbons

Show affiliations


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 generalized 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 discuss a formulation of the Friedmann equation as unparametrized geodesic motion and its connection with the Lagrangian treatment of perfect fluids coupled to gravity.


PACS

98.80.Es Observational cosmology (including Hubble constant, distance scale, cosmological constant, early Universe, etc)

95.30.Sf Relativity and gravitation

04.40.Nr Einstein-Maxwell spacetimes, spacetimes with fluids, radiation or classical fields

04.20.-q Classical general relativity

MSC

83F05 Cosmology

83Cxx General relativity

Subjects

Gravitation and cosmology

Astrophysics and astroparticles

Dates

Issue 23 (7 December 2008)

Received 8 July 2008, in final form 11 September 2008

Published 17 November 2008



  1. Cosmic jerk, snap and beyond

    Maciej Dunajski and Gary Gibbons 2008 Class. Quantum Grav. 25 235012

  2. Molecular dynamics for low temperature plasma–surface interaction studies

    David B Graves and Pascal Brault 2009 J. Phys. D: Appl. Phys. 42 194011

  3. Can rigidly rotating polytropes be sources of the Kerr metric?

    J Martín et al 2008 Class. Quantum Grav. 25 105019

  4. Exact wavefunctions for a time-dependent Coulomb potential

    S Menouar et al 2008 J. Phys. A: Math. Theor. 41 215303

  5. Geometric properties of magnetized black hole event horizons and ergosurfaces

    E P Esteban 2009 J. Phys.: Conf. Ser. 189 012012

  6. Thermoelectric signals from Si/SiGe superlattices

    Zhou Xiaofang et al 2009 J. Phys. D: Appl. Phys. 42 225303

  7. Full-spectrum interrogation of fiber Bragg grating sensors for dynamic measurements in composite laminates

    S Schultz et al 2009 Smart Mater. Struct. 18 115015

  8. A hybrid method for calculation of Ruelle–Pollicott resonances

    Martin Horvat and Gregor Veble 2009 J. Phys. A: Math. Theor. 42 465101

  9. Electronic structure of a σ-FeCr compound

    J Cieslak et al 2008 J. Phys.: Condens. Matter 20 235234

  10. Toric duality as Seiberg duality and brane diamonds

    Bo Feng et al JHEP12(2001)035

View by subject




Export








Please login to access our web services, or create an account if you don't yet have one.

You must have cookies enabled in your web browser to be able to login.

Username
Password

Forgotten your password? Get a new one here.