References 157[79] Kolb E W and Turner M S 1990The Early Universe(New York: Wiley)
[80] Kompaneets A S and Chernov A S 1965Sov. Phys.–JETP 201303
[81] Lachieze R M and Luminet J P 1995Phys. Rep. 254136
[82] Lewis A, Challinor A and Lasenby A 2000 Astrophys. J. 538 3273 (astro-
ph/9911177)
[83] Kramer D, Stephani H, MacCallum M A H and Herlt E 1980Exact Solutions of
Einstein’s Field Equations(Cambridge: Cambridge University Press)
[84] Krasi ́nski A 1983Gen. Rel. Grav. 15673
[85] Krasi ́nski A 1996Physics in an Inhomogeneous Universe(Cambridge: Cambridge
University Press)
[86] Kristian J and Sachs R K 1966Astrophys. J. 143379
[87] Lemaˆıtre G 1933Ann. Soc. Sci. Bruxelles IA 53 51 (Engl. transl. 1997Gen. Rel.
Grav. 29 641)
[88] Leslie J (ed) 1998Modern Cosmology and Philosophy(Amherst, NY: Prometheus
Books)
[89] Lidsey J E, Wands D and Copeland E J 2000 Superstring cosmologyPhys. Rep. 337
343–492
[90] Linde A D 1990Particle Physics and Inflationary Cosmology(Chur, Switzerland:
Harwood Academic)
[91] Maartens R 1997Phys. Rev.D 55463
[92] MacCallum M A H 1973Carg`ese Lectures in Physicsvol6,edESchatzman(New
York: Gordon and Breach)
[93] MacCallum M A H 1979General Relativity, An Einstein Centenary Surveyed
S W Hawking and W Israel (Cambridge: Cambridge University Press)
[94] Madsen M and Ellis G F R 1988Mon. Not. R. Astron. Soc. 23467
[95] Maor I, Brustein R and Steinhardt P J 2001Phys. Rev. Lett. 866
[96] Martin J and Brandenberger R H 2001Phys. Rev.D 63123501
[97] Misner C W 1968Astrophys. J. 151431
[98] Mustapha N, Hellaby C and Ellis G F R 1999Mon. Not. R. Astron. Soc. 292817
[99] Nilsson U S, Uggla C and Wainwright J 1999Astrophys. J. Lett. 522 L1 (gr-
qc/9904252)
[100] Nilsson U S, Uggla C and Wainwright J 2000Gen. Rel. Grav. 32 1319 (gr-
qc/9908062)
[101] Oszvath I and Sch ̈ucking E 1962Nature 1931168
[102] Pan J and Coles P 2000Mon. Not. R. Astron. Soc. 318 L51
[103] Peacocke J R 1999Cosmological Physics(Cambridge: Cambridge University
Press)
[104] Peebles P J E, Schramm D N, Turner E L and Kron R G 1991Nature 352769
[105] Penrose R 1989Proc. 14th Texas Symposium on Relativistic Astrophysics (Ann. New
York Acad. Sci.)ed E Fenves
[106] Penrose R 1989The Emperor’s New Mind(Oxford: Oxford University Press) ch 7
[107] Pirani F A E 1956Acta Phys. Polon. 15389
[108] Pirani F A E 1957Phys. Rev. 1051089
[109] Raychaudhuri A and Modak B 1988Class. Quantum Grav. 5225
[110] Rindler W 1956Mon. Not. R. Astron. Soc. 116662
[111] Rothman A and Ellis G F R 1986Phys. Lett.B 18019
[112] Schucking E 1954Z. Phys. 137595
[113] Senovilla J M, Sopuerta C and Szekeres P 1998Gen. Rel. Grav. 30389