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Cosmography: Cosmology without the Einstein equations
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How much of modern cosmology is really cosmography? How much of modern cosmology is independent of the Einstein equations? (Independent of the Friedmann equations?) These questions are becoming increasingly germane -- as the models cosmologists use for the stress-energy content of the universe become increasingly baroque, it behoves us to step back a little and carefully disentangle cosmological kinematics from cosmological dynamics. The use of basic symmetry principles (such as the cosmological principle) permits us to do a considerable amount, without ever having to address the vexatious issues of just how much "dark energy", "dark matter", "quintessence", and/or "phantom matter" is needed in order to satisfy the Einstein equations. This is the sub-sector of cosmology that Weinberg refers to as "cosmography", and in this article I will explore the extent to which cosmography is sufficient for analyzing the Hubble law and so describing many of the features of the universe around us.
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Cited by 6 Pith papers
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Cosmic microwave background temperature cosmography
Violations of the CMB temperature-redshift law are constrained to percent level by cosmography on SZ and spectroscopic data, with one non-standard parameter sufficient and no advantage from Padé or y-expansions.
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Cosmographic analysis of sign-switching dark energy
New sign-switching dark energy models with ladder, smooth-step and error-function profiles are introduced and compared, with continuous transitions shown to convert the Lambda_sCDM sudden singularity into a milder w-s...
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Evolution of matter perturbations in the context of cosmic slowing down
For five phantom-capable dark-energy parameterizations, the growth index at redshift zero is about 0.54 with a negative slope, and the f-sigma-8 combination lies below the Lambda-CDM prediction over most of the redshi...
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Kinematic Probes of Type-II MMG: Pad\'e Cosmographic Analysis of VCDM
Padé cosmographic analysis with MCMC constrains VCDM parameters using chronometers, DESI BAO, and supernova datasets, showing consistency with ΛCDM and no robust transition feature.
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Effect of Peak Absolute Magnitude of Type Ia Supernovae and Sound Horizon Values on Hubble Tension using DESI results
Using DESI DR1, Pantheon+ and cosmic chronometer data, the authors show that changing the Type Ia supernova absolute magnitude and sound-horizon priors moves the inferred H0 from about 73 to 68 km/s/Mpc, reducing the ...
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Chebyshev cosmography in the framework of extended symmetric teleparallel theory
A two-variable Chebyshev polynomial reconstruction of f(Q,T) gravity is shown to be algebraically identical to a truncated Taylor series, then fitted to Pantheon+SH0ES data.
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