Ali Rida Khalife

4 Questions 11 Answers 0 Followers

Questions related from Ali Rida Khalife

How is it possible to have a decelerating Friedman Universe after inflation?

According to Mukhanov's "Physical foundations of cosmology" (page 230), to solve the Horizon and flatness problems, the rate of change of the scale factor today should be greater than the rate of...

15 April 2015 916 17 View

Why do we use scalar fields to explain the dynamics of inflation, quintessence, curvaton?

In most of the inflationary models, or quintessence models, a scalar field has been used to describe the dynamics. Why is this? I know that some models use vector fields, but if you want to use...

05 March 2015 6,970 11 View

Why does the event horizon of a closed, dust-dominated universe, vanish in the expansion phase?

It is stated in V. Mukhanov's book "Physical foundations of Cosmology" the following (page 44, after equation 2.25): "In contrast, for the dust dominated universe, where ηmax=2π, the event horizon...

20 January 2015 6,315 6 View

What if I jump over an infinite cliff? When will I become a "relativistic" human?

Imagine that I'm jumping over an infinite cliff, under the influence of the gravitational force(F=mg, where m is my mass and g is the gravitational constant). At some point, due to the...

13 January 2014 7,702 1 View