Cosmology practice problems

What is an example of cosmology philosophy?
One example of philosophy of cosmology that seems to have trickled out to the layman is the idea of fine tuning—the notion that in the set of all possible physics, the subset that permits the evolution of life is very small, and that from this it is possible to conclude that the universe is either one of a large number .
What is the current model of the Universe?
The standard model of cosmology today, the Lambda-CDM model, has been extremely successful at providing a theoretical framework for structure formation, the anisotropies in the cosmic microwave background, and the accelerating expansion of the universe..
What is the problem of the cosmological constant?
The problem arises
This is to say that while the universe is observed to be incredibly big, physicists calculate that it must be tinier than a proton.
This, in a nutshell, is the cosmological constant problem, and it has come to be called rightly as “the worst theoretical prediction in the history of physics”..
Cosmology is in crisis.
Rather like a gigantic balloon, the Universe has been constantly expanding ever since the Big Bang, 13.8 billion years ago.
The crux of the problem now shaking up the world of cosmology has to do with the rate at which this is happening.
The density parameter is the ratio of the average density of matter and energy in the Universe to the critical density (the density at which the Universe would stop expanding only after an infinite time).

Problems. PHY306 Introduction to Cosmology. Practice Problems. NOTE: The Friedman equation: ˙a(t)2 = 8πG. 3c2 ( Er0 a(t)2. + E m0 a(t)) − kc2. R2. 0. +. Λ. 3 a

The answer you get is in fact wrong: WMAP finds that the redshift of matter-radiation equality is zeq = 3200.

The current standard cosmological model, which I call the “benchmark” model to distinguish it from the Standard Model of particle physics, is a flat universe

Cosmology practice problems

What is an example of cosmology philosophy?

What is the current model of the Universe?

What is the problem of the cosmological constant?