Physics
10th Edition
ISBN: 9781118486894
Author: David Young, Shane Stadler
Publisher: WILEY
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Chapter 25, Problem 4FC
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Question B3
Consider the following FLRW spacetime:
t2
ds² = -dt² +
(dx²
+ dy²+ dz²),
t2
where t is a constant.
a)
State whether this universe is spatially open, closed or flat.
[2 marks]
b) Determine the Hubble factor H(t), and represent it in a (roughly drawn) plot as a function
of time t, starting at t = 0.
[3 marks]
c) Taking galaxy A to be located at (x, y, z) = (0,0,0), determine the proper distance to galaxy
B located at (x, y, z) = (L, 0, 0). Determine the recessional velocity of galaxy B with respect
to galaxy A.
d) The Friedmann equations are
2
k
8πG
а
4πG
+
a²
(p+3p).
3
a
3
[5 marks]
Use these equations to determine the energy density p(t) and the pressure p(t) for the
FLRW spacetime specified at the top of the page.
[5 marks]
e) Given the result of question B3.d, state whether the FLRW universe in question is (i)
radiation-dominated, (ii) matter-dominated, (iii) cosmological-constant-dominated, or (iv)
none of the previous. Justify your answer.
f)
[5 marks]
A conformally…
SECTION B
Answer ONLY TWO questions in Section B
[Expect to use one single-sided A4 page for each Section-B sub question.]
Question B1
Consider the line element
where w is a constant.
ds²=-dt²+e2wt dx²,
a) Determine the components of the metric and of the inverse metric.
[2 marks]
b) Determine the Christoffel symbols. [See the Appendix of this document.]
[10 marks]
c)
Write down the geodesic equations.
[5 marks]
d) Show that e2wt it is a constant of geodesic motion.
[4 marks]
e)
Solve the geodesic equations for null geodesics.
[4 marks]
Page 2
SECTION A
Answer ALL questions in Section A
[Expect to use one single-sided A4 page for each Section-A sub question.]
Question A1
SPA6308 (2024)
Consider Minkowski spacetime in Cartesian coordinates th
=
(t, x, y, z), such that
ds² = dt² + dx² + dy² + dz².
(a) Consider the vector with components V" = (1,-1,0,0). Determine V and V. V.
(b) Consider now the coordinate system x' (u, v, y, z) such that
u =t-x,
v=t+x.
[2 marks]
Write down the line element, the metric, the Christoffel symbols and the Riemann curvature
tensor in the new coordinates. [See the Appendix of this document.]
[5 marks]
(c) Determine V", that is, write the object in question A1.a in the coordinate system x'. Verify
explicitly that V. V is invariant under the coordinate transformation.
Question A2
[5 marks]
Suppose that A, is a covector field, and consider the object
Fv=AAμ.
(a) Show explicitly that F is a tensor, that is, show that it transforms appropriately under a
coordinate transformation.
[5 marks]
(b)…
Chapter 25 Solutions
Physics
Ch. 25.3 - Prob. 1CYUCh. 25.3 - Prob. 2CYUCh. 25.3 - Prob. 3CYUCh. 25.4 - Prob. 4CYUCh. 25.4 - Prob. 5CYUCh. 25.4 - Prob. 6CYUCh. 25.5 - Prob. 8CYUCh. 25.5 - 9. (a) Can the image formed by a concave mirror...Ch. 25.5 - Prob. 10CYUCh. 25.5 - Prob. 11CYU
Ch. 25.5 - Prob. 12CYUCh. 25.6 - Prob. 13CYUCh. 25 - Prob. 2FCCh. 25 - Prob. 4FCCh. 25 - Prob. 6FCCh. 25 - Prob. 7FCCh. 25 - Prob. 8FCCh. 25 - Prob. 12FCCh. 25 - Prob. 13FCCh. 25 - Prob. 14FCCh. 25 - Prob. 15FCCh. 25 - Prob. 1PCh. 25 - Prob. 2PCh. 25 - Prob. 3PCh. 25 - Prob. 4PCh. 25 - Prob. 5PCh. 25 - Prob. 6PCh. 25 - Prob. 7PCh. 25 - Prob. 8PCh. 25 - Prob. 9PCh. 25 - Prob. 10PCh. 25 - 11. Two plane mirrors are facing each other. They...Ch. 25 - Prob. 12PCh. 25 - Prob. 13PCh. 25 - 14. The image of a very distant car is located 12...Ch. 25 - Prob. 15PCh. 25 - Prob. 16PCh. 25 - Prob. 17PCh. 25 - Prob. 18PCh. 25 - Prob. 19PCh. 25 - Prob. 20PCh. 25 - 21. A concave mirror (R = 56.0 cm) is used to...Ch. 25 - Prob. 22PCh. 25 - Prob. 23PCh. 25 - Prob. 24PCh. 25 - Prob. 25PCh. 25 - Prob. 26PCh. 25 - Prob. 27PCh. 25 - Prob. 28PCh. 25 - Prob. 29PCh. 25 - Prob. 30PCh. 25 - Prob. 31PCh. 25 - Prob. 32PCh. 25 - Prob. 33PCh. 25 - Prob. 34PCh. 25 - Prob. 35PCh. 25 - Prob. 36APCh. 25 - Prob. 37APCh. 25 - Prob. 38APCh. 25 - Prob. 39APCh. 25 - Prob. 40APCh. 25 - Prob. 41APCh. 25 - Prob. 42APCh. 25 - Prob. 43APCh. 25 - Prob. 44APCh. 25 - Prob. 45APCh. 25 - Prob. 46APCh. 25 - Prob. 47APCh. 25 - Prob. 48CCPCh. 25 - 49. The radius of curvature of a mirror is 24 cm....
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