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Abstract

The goal of the article is to provide some glimpses into the challenges and successes of quantum gravity. After a general introduction, for concreteness I focus on a specific approach which goes under the name loop quantum gravity. The underlying ideas are first summarized and recent advances are then illustrated by applying these ideas to cosmology. Quantum effects of geometry resolve the big-bang singularity of classical general relativity. Quantum physics does not break down at the big-bang. In simple models where details have been fully worked out, there is a pre-big-bang branch joined to the current post-big-bang branch by well-defined quantum evolution.

Original languageEnglish (US)
Title of host publicationBeyond the Quantum
PublisherWorld Scientific Publishing Co.
Pages20-34
Number of pages15
ISBN (Electronic)9789812771186
ISBN (Print)9812771174, 9789812771179
DOIs
StatePublished - Jan 1 2007

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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    Ashtekar, A. (2007). What did we learn from quantum gravity? In Beyond the Quantum (pp. 20-34). World Scientific Publishing Co.. https://doi.org/10.1142/9789812771186_0002