Abstract
We discuss the obstacles for defining a set of observable quantities analogous to an S-matrix which are needed to formulate string theory in an accelerating universe. We show that the quintessence models with the equations of state −1 < w
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APA
Hellerman, S., Kaloper, N., & Susskind, L. (2001). String theory and quintessence. Journal of High Energy Physics, 5(6). https://doi.org/10.1088/1126-6708/2001/06/003
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