Cosmic string from hidden-sector flux tubes

B. A. Campbell, J. Ellis, D. V. Nanopoulos, K. A. Olive, S. Rudaz

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


The possibilities for obtaining cosmic strings from a underlying E8 × E'8 superstring theory are considered. It is shown that the observable sector cannot provide cosmic strings with a tension large enough to give interesting density perturbations: δ ρ{variant}/ρ{variant} ∼ 10-4. Neither can the hidden sector yield cosmic strings if E'8 is unbroken, while flux tubes give δ ρ{variant}/ρ{variant} too large if E'8 is broken to a subgroup bigger than SU(4), and too small if it is broken to a subgroup smaller than SU(4). However, flux tubes in the hidden sector can provide cosmic strings with δ ρ{variant}/ρ{variant} ∼ 10-4 if E'8 is broken to an SU(4) subgroup. If there was inflation, this mechanism would only be operative if the universe subsequently reheated to a temperature above 1016 GeV.

Original languageEnglish (US)
Pages (from-to)37-42
Number of pages6
JournalPhysics Letters B
Issue number1-2
StatePublished - Oct 16 1986

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