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Singular General Relativity - Theory.nipne.ro

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Int<strong>ro</strong>duction<br />

P<strong>ro</strong>blems of <st<strong>ro</strong>ng>General</st<strong>ro</strong>ng> <st<strong>ro</strong>ng>Relativity</st<strong>ro</strong>ng><br />

There are two big p<strong>ro</strong>blems in <st<strong>ro</strong>ng>General</st<strong>ro</strong>ng> <st<strong>ro</strong>ng>Relativity</st<strong>ro</strong>ng>:<br />

1 It predicts the occurrence of singularities (Pen<strong>ro</strong>se, 1965; Hawking,<br />

1966a; Hawking, 1966b; Hawking, 1967; Hawking & Pen<strong>ro</strong>se, 1970).<br />

2 The attempts to quantize gravity seem to fail, because it is<br />

perturbatively nonrenormalizable (’t Hooft & Veltman, 1974; Go<strong>ro</strong>ff<br />

& Sagnotti, 1986).<br />

Are these p<strong>ro</strong>blems signs that we should give up <st<strong>ro</strong>ng>General</st<strong>ro</strong>ng> <st<strong>ro</strong>ng>Relativity</st<strong>ro</strong>ng> in<br />

favor of more radical app<strong>ro</strong>aches (superstrings, loop quantum gravity etc.)?<br />

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