Unification with low string scale | Zendy

Constantin P. Bachas | Zendy

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Unification with low string scale

Author(s) -

Constantin P. Bachas

Publication year - 1998

Publication title -

journal of high energy physics

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.998

H-Index - 261

eISSN - 1126-6708

pISSN - 1029-8479

DOI - 10.1088/1126-6708/1998/11/023

Subject(s) - physics , string (physics) , theoretical physics , unification , grand unified theory , electroweak scale , hierarchy problem , scale (ratio) , particle physics , non critical string theory , electroweak interaction , compactification (mathematics) , supersymmetry , mathematics , quantum mechanics , computer science , pure mathematics , programming language

I argue that in open-string theory with hierarchically small (or large) extradimensions, gauge groups can unify naturally with logarithmically-runningcoupling constants at the high Kaluza-Klein (or string-winding) scale. This opens up the possibility of rescuing the standard logarithmicunification at $M_U\sim 10^{15-18}$ GeV even if the fundamental-string scale ismuch lower, at intermediate or possibly even electroweak scales. I alsoexplain, however, why a low type-I string scale may not suffice to obliteratethe ultraviolet problems usually associated with the gauge hierarchy.Comment: 6 pages, uses harvmac. Two minor changes. Final version to appear in JHE

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