期刊
CLASSICAL AND QUANTUM GRAVITY
卷 20, 期 12, 页码 S321-S346出版社
IOP PUBLISHING LTD
DOI: 10.1088/0264-9381/20/12/301
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After a pedagogical review of elementary cosmology, I go on to discuss some obstacles to obtaining inflationary or accelerating universes in M/string theory. In particular, I give an account of an old 'no-go theorem' to this effect. I then describe some recent ideas about the possible role of the tachyon in cosmology. I stress that there are many objections to a naive inflationary model based on the tachyon, but there remains the possibility that the tachyon was important in a possible pre-inflationary 'open string era' preceding our present 'closed string era'.
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