# What do we know about cosmography

@article{Zhang2016WhatDW, title={What do we know about cosmography}, author={Ming Zhang and Hong Li and Junqing Xia}, journal={The European Physical Journal C}, year={2016}, volume={77}, pages={1-12} }

In the present paper, we investigate the cosmographic problem using the bias–variance trade-off. We find that both the z-redshift and the $$y=z/(1+z)$$y=z/(1+z)-redshift can present a small bias estimation. It means that the cosmography can describe the supernova data more accurately. Minimizing risk, it suggests that cosmography up to the second order is the best approximation. Forecasting the constraint from future measurements, we find that future supernova and redshift drift can…

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## References

SHOWING 1-10 OF 119 REFERENCES

High-Redshift Cosmography

- Physics
- 2010

We constrain the parameters describing the kinematical state of the universe using a cosmographic approach, which is fundamental in that it requires a very minimal set of assumptions (namely to…

Cosmography and constraints on the equation of state of the Universe in various parametrizations

- Physics
- 2012

We use cosmography to present constraints on the kinematics of the Universe, without postulating any underlying theoretical model. To this end, we use a Monte Carlo Markov Chain analysis to perform…

High-redshift cosmography: new results and implications for dark energy

- Physics
- 2012

The explanation of the accelerated expansion of the Universe poses one of the most fundamental questions in physics and cosmology today. If the acceleration is driven by some form of dark energy…

The Hubble series: convergence properties and redshift variables

- Physics
- 2007

In cosmography, cosmokinetics and cosmology, it is quite common to encounter physical quantities expanded as a Taylor series in the cosmological redshift z. Perhaps the most well-known exemplar of…

Constraints on the redshift dependence of the dark energy potential

- Physics
- 2005

We develop a formalism to characterize the shape and the redshift evolution of the dark energy potential. Our formalism makes use of quantities similar to the horizon-flow parameters in inflation and…

Testing Lambda and the Limits of Cosmography with the Union2.1 Supernova Compilation

- Physics
- 2013

We present a cosmographic study designed to test the simplest type of accelerating cosmology: a flat universe with matter and a cosmological constant ($\Lambda$). Hubble series expansions are fit to…

Comprehensive cosmographic analysis by Markov Chain Method

- Physics
- 2011

We study the possibility to extract model independent information about the dynamics of the universe by using Cosmography. We intend to explore it systematically, to learn about its limitations and…

Cosmographic Hubble fits to the supernova data

- Physics
- 2008

The Hubble relation between distance and redshift is a purely cosmographic relation that depends only on the symmetries of a Friedmann-Lemaitre-Robertson-Walker spacetime, but does not intrinsically…

Cosmography beyond standard candles and rulers

- Physics
- 2012

We perform a cosmographic analysis using several cosmological observables such as the luminosity distance moduli, the volume distance, the angular diameter distance and the Hubble parameter. These…

Reconstruction of dark energy and expansion dynamics using Gaussian processes

- Physics
- 2012

An important issue in cosmology is reconstructing the effective dark energy equation of state directly from observations. With few physically motivated models, future dark energy studies cannot only…