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Well done Dr. Liddle ! A great achievement .............
The book puts the case for the hot big bang model, which is by far the most popular cosmological model at this time. There is a chapter on the successes of this model: explanation of the cosmic background radiation, universal expansion, and the relative abundance of elements in the early universe. There follows a chapter on the major problems of this model: how come the background radiation looks the same (to within one part in a hundred thousand) everywhere, even when light hasn't had time to travel between all these regions? How did the universe become structured (into things such as stars) when physics predicts that matter should be homogeneously spread? And why does the universe (seemingly) possess the exact right density (to almost infinitessimal precision) to stay flat, as we see it today? Inflation theory offers some help, but at the same time asks a bigger question: which of the many inflation theories (if any) is right? Liddle doesn't go into much detail on this point, but you get a good introduction into what inflation is and why such an odd theory would be proposed.
I'm making it sound as if the big bang model has more problems than it solves, which I don't think it does (heck, it's the best theory we've got). But the problems are more interesting!
On which subject, there are problems (solvable ones!) at the end of each chapter, with brief solutions at the end of the book.
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