I'm having trouble understanding the part in the Friedman equation where a'/a. I can't figure out why it's the derivative of a over a itself. If someone could give me some sort of analogy to something I already understand that would help. I'm pretty sure a is the rate at which the universe expands but not 100% sure. I've watched the Susskind lectures on Cosmology but he sort of glosses over that part.(adsbygoogle = window.adsbygoogle || []).push({});

**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!

# Scale factor

Loading...

Similar Threads - Scale factor | Date |
---|---|

I Object moving out of the Observable Universe due to Expansion | Mar 1, 2017 |

I Hubble parameter in terms of the scale factor | Aug 3, 2016 |

Time dependence of the Ratio Hubble length to scale factor | Nov 11, 2015 |

Scale factor | Apr 14, 2015 |

Scale Factor | Apr 3, 2015 |

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