Abstract
Recent astrophysical observations, pertaining to either high-redshift supernovae or cosmic microwave background temperature fluctuations, as those measured recently by the WMAP satellite, provide us with data of unprecedented accuracy, pointing towards two (related) facts: (i) our Universe is accelerated at present, and (ii) more than 70% of its energy content consists of an unknown substance, termed dark energy, which is believed responsible for its current acceleration. Both of these facts are a challenge to String theory. In this review I outline briefly the challenges, the problems and possible avenues for research towards a resolution of the Dark Energy issue in string theory.
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Mavromatos, N. (2007). The Issue of Dark Energy in String Theory. In: Papantonopoulos, L. (eds) The Invisible Universe: Dark Matter and Dark Energy. Lecture Notes in Physics, vol 720. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-71013-4_12
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