String theory and the arrow of time

Nissan Itzhaki*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


Time-like linear dilaton triggers, at the classical level, the creation of closed folded strings at an instant. We show that in cosmology these instant folded strings induce negative pressure at no energy cost. Hence they seem to allow an era in which the energy density increases (decreases) while the universe is expanding (contracting). This and other aspects of instant folded strings suggest that they might shed new light on the origin of the arrow of time.

Original languageEnglish
Article number192
JournalJournal of High Energy Physics
Issue number3
StatePublished - Mar 2021


  • Cosmology of Theories beyond the SM
  • Long strings


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