The Friedmann Equation is a mathematical equation that describes the expansion of the universe in terms of its energy density and curvature. It is a key component of the standard model of cosmology and is used to understand the evolution of the universe.
Edward Liddle is a British theoretical physicist and cosmologist who is known for his research in the field of cosmology and the Friedmann Equation. He has published numerous papers and is considered an expert in the field.
The Friedmann Equation takes into account the energy density and curvature of the universe and shows how they affect the expansion of the universe over time. By plugging in different values for these parameters, we can see how the universe has expanded and will continue to expand in the future.
The Friedmann Equation assumes that the universe is homogeneous and isotropic on large scales, meaning that it looks the same in all directions and at all points in space. It also assumes that the universe is filled with a perfect fluid, meaning that it has uniform energy density and pressure.
The Friedmann Equation has been tested and validated through various observations and experiments, such as the cosmic microwave background radiation and the redshift of galaxies. These observations have shown that the universe is expanding and that the Friedmann Equation accurately describes this expansion.