Multiple Choice
The flatness problem in cosmology asks the question:
A) why is the sky dark at night?
B) why was the density of the universe so close to the critical density just after the Big Bang?
C) why are the four forces (strong, weak, electromagnetic, and gravitational) not unified in the present-day universe?
D) why is the temperature of the cosmic background radiation so smooth (isotropic) around the sky?
Correct Answer:
Verified
Correct Answer:
Verified
Q16: If the average mass density ρ<sub>0</sub> had
Q17: Which one of the following statements correctly
Q18: Within which time interval from the initial
Q19: After about 2 seconds, the early universe
Q20: When we apply the Jeans length criterion
Q22: It has been shown that above 100
Q23: In the string theory of Edward Witten:<br>A)there
Q24: What is a virtual particle?<br>A)a collection of
Q25: If gravity holds galaxies together and the
Q26: Would you expect the neutrino-antineutrino background to