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Calculate the critical density of a universe with Hubble constant of 89 km-s¹.Mpc¯¹.

Calculate the critical density of a universe with Hubble constant of 89 km-s¹.Mpc¯¹.

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Calculate the critical density of a universe with Hubble constant of 89 km-s¹ Mpc²¹.
Transcribed Image Text:Calculate the critical density of a universe with Hubble constant of 89 km-s¹ Mpc²¹.
Expert Solution
Concept and Principle:
  • It is observed that galaxies are moving away from each other and the farther they are faster they move away. This expansion is called Hubble flow. Hubble constant gives us the rate of this expansion.

 

  • The minimum density that is required to stop this expansion is defined as the critical density. It is given by,

ρc=3H28πG

Here H is the Hubble constant and G is Newton’s gravitational constant.

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