Hubble constant depend on expansion model?

[johne1618]

Does the measured value of the Hubble constant, H_0, depend on the details of the expansion model one uses?

 

[Vorde]

The Hubble Constant is not dimensionless (i.e., it will change depending on the units you are using), I know that slightly different values have been collected depending on the method used (all within error bars), I believe that the Cosmological Constant can be given a arbitrary value in Einsteins GR equations, although there is only a small range where the value would be reasonable.

The reason I bring both up is that while the Hubble Constant is based on observation, the Cosmological Constant is based in the equations.

 

[Chalnoth]

Does the measured value of the Hubble constant, H_0, depend on the details of the expansion model one uses?

That depends somewhat upon how it is measured. If it is inferred from far-away observations, such as the Cosmic Microwave Background, then the answer is yes. But our most accurate measurements of $H_0$ are from nearby observations where the expansion rate hasn't changed enough for it to really matter what our model of the expansion is.

 

[Chalnoth]

The Hubble Constant is not dimensionless (i.e., it will change depending on the units you are using), I know that slightly different values have been collected depending on the method used (all within error bars), I believe that the Cosmological Constant can be given a arbitrary value in Einsteins GR equations, although there is only a small range where the value would be reasonable.

The reason I bring both up is that while the Hubble Constant is based on observation, the Cosmological Constant is based in the equations.

What? Why are you bringing this up? Because it sounds completely off-topic to me.

 

[sardar]

The measured value of the Hubble constant, H_0, is affected by the details of the expansion model used. This is because the expansion model influences the interpretation of the observed data and the assumptions made in calculating the Hubble constant. For instance, different expansion models may have different assumptions about the distribution of matter in the universe, the rate of expansion, and the effects of dark energy. These differences can result in variations in the calculated value of H_0.

Furthermore, the expansion model used can also affect the precision and accuracy of the Hubble constant measurement. Some models may have more uncertainties or limitations than others, leading to a less precise or accurate value of H_0. Therefore, it is important to carefully consider the expansion model used when interpreting the measured value of the Hubble constant.

In summary, the measured value of the Hubble constant, H_0, does depend on the details of the expansion model used. It is crucial for scientists to carefully evaluate and compare different expansion models to better understand the true value and nature of the Hubble constant.