The LightCone7 cosmological calculator has been under collaboratively development on this forum for over three years now. It has sprouted a branch following Marcus' definition of a 'natural timescale of the present universe' - the long term Hubble time, which we collaboratively labelled one "zeit". So there are presently two versions: LightCone7s (for 'standard'), which is also linked to simply as LightCone7, and then LightCone7zeit. They are presently in a few signatures around here.(adsbygoogle = window.adsbygoogle || []).push({});

LightCone7 is essentially a table-making calculator, but one of the great features that emerged is a charting option. It has a predefined set of 12 curves, which can be selected for inclusion in the table or chart. What LightCone7zeit taught us is that the degree of normalization resulting from using zeit and light-zeit units is very useful when comparing different graphs with each other. The normal values of cosmological parameters in their usual units have widely different scales.

Just for illustrating the point that I want to make (and without claiming any usefulness for the full set of graphs), here are the whole lot in one chart. Apart from the light-green D_particle graph, all the others have comparable normalized magnitudes over a very useful range of time.

Despite the naturalness of the zeit timescale in cosmological terms, it has a certain "unnatural" ring in human terms, e.g. the present cosmological time is about 0.8 zeit and the present Hubble radius R is 0.83 lzeit.

I experimented a little with other normalization values and found that the present Hubble radius (R_0) and the present cosmological time (T_now) 'looks more natural', to me at least.

I'm aware of the fact that this destroys some of the mathematical simplicity of the zeit-scale normalization, but I would like to know other opinions on it.

**Physics Forums - The Fusion of Science and Community**

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Normalized LightCone7 Graphs

Loading...

Similar Threads - Normalized LightCone7 Graphs | Date |
---|---|

B The distribution of normal matter precisely determines gravity | Feb 20, 2017 |

Insights LightCone7 Tutorial Part III - How Things are Computed - Comments | Feb 11, 2016 |

Normal&good question about redshift | Mar 13, 2013 |

Interaction between dark matter and normal matter | Apr 30, 2011 |

Inflation or normal space/time misunderstood? | Apr 9, 2010 |

**Physics Forums - The Fusion of Science and Community**