کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1842206 | 1031415 | 2008 | 35 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
On the unitarity of gauged non-compact WZNW strings
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موضوعات مرتبط
مهندسی و علوم پایه
ریاضیات
فیزیک ریاضی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: On the unitarity of gauged non-compact WZNW strings On the unitarity of gauged non-compact WZNW strings](/preview/png/1842206.png)
چکیده انگلیسی
In this paper we investigate the unitarity of gauged non-compact WZNW strings, i.e., string theories formulated as G/Hâ² WZNW models, where G is a non-compact group. These models represent string theories on non-trivial curved space-times with one time-like component. We will prove that for the class of models connected to Hermitian symmetric spaces, and a natural set of discrete highest weight representations, the BRST formulation, in which the gauging is defined through a BRST condition, yields unitarity. Unitarity requires the level times the Dynkin index to be an integer, as well as integer valued highest weights w.r.t. the compact subalgebra. We will also show that the BRST formulation is not equivalent to the conventional GKO coset formulation, defined by imposing a highest weight condition w.r.t. Hâ². The latter leads to non-unitary physical string states. This is, to our knowledge, the first example of a fundamental difference between the two formulations.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Nuclear Physics B - Volume 797, Issue 3, 11 July 2008, Pages 464-498
Journal: Nuclear Physics B - Volume 797, Issue 3, 11 July 2008, Pages 464-498
نویسندگان
Jonas Björnsson, Stephen Hwang,