제1부(요약). 공간과 시간(Space and Time)
제2부. 우리 우주의 역학과 기하학(Geometry and Dynamics of our universe)
V2.1 로버트슨-워커 측량(The Robertson-Walker Metric)
V2.2 원주율(π, Pi)
V2.3 휘어진 공간(Curved Space)
V2.4 프리드먼 방정식(The Friedman Equation)
V2.5 임계 밀도(Critical density)
V2.6 밀도 변화(Density Evolution)
V2.7 우주의 진화(Evolution of the Universe)
V2.8 결론(Conclusion)
WE2.1 우주의 나이(Age of Universe)
HQ2. 숙제(Homework Questions 2)
[HQ2.1]----------------------------------------------------
Imagine that you live in a universe in which parallel lines eventually meet. If you assume that the cosmological models we discuss in this section are correct, what could you deduce about your universe from this?
Select all the answers that match
a] Ω > 1
b) k is less than 0
c) The universe is infinite.
d] The universe will end in a Big Crunch.
e] If you travel far enough in a straight line, you will return to where you started.
f) The internal angles of a large enough triangle will add up to less than 180 degrees.
g] π is less than 3.14159265359... on large scales
Parallel lines meeting indicate a spherical closed universe. Which is therefore finite and will end in a big crunch. The density must be more than critical and k greater than zero.
[HQ2.2]----------------------------------------------------

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