NUK - logo
Univerzitetna knjižnica Maribor (UKM)
Knjižnica je med tednom odprta od 8. do 19. ure, ob sobotah od 9. do 13. ure. Čitalnica ČUK je odprta od ponedeljka do sobote od 9. do 24. ure, ob nedeljah od 16. do 24. ure. Informacije: 02 25 07 431, ukm@um.si
PDF
  • Orientifolds and slumps in G2[sub] and spin(7) metrics
    Cvetič, Mirjam ...
    We discuss some new metrics of special holonomy, and their roles in string theory and M-theory. First we consider spin(7) metrics denoted by C8, which are complete on a complex line bundle over CP3. ... The principal orbits areS7, described as a triaxially squashed S3 bundle over S4. The behaviour in the S3 directions is similar to that in the Atiyah-Hitchin metric, and we showhow this leads to an M-theory interpretation with orientifold D6-branes wrapped over S4. We then consider new G2 metrics which we denote by C7, which are complete on an R2 bundle over T1,1 with principal orbits that are S3*S3. We study the C7 metrics using numerical methods, and we find that they have the remarkable property of admitting a U(1) Killing vector whose length is nowhere zero or infinite. This allows one to make an everywhere non-singular reduction of an M-theory solution to give a solution of the type IIA theory. The solution has two non-trivial S2 cycles, and both carry magnetic charge with respect to the R-R vector field. We also discuss some four-dimensional hyper-Kahler metrics described recently by Cherkis and Kapustin, following earlier work by Kronheimer. We show that in certain cases these metrics, whose explicit form is known only asymptotically, can be related to metrics characterised by solutions of the su(?) Toda equation, which can provide a way of studying their interior structure.
    Vir: Annals of physics. - ISSN 0003-4916 (Vol. 310, no. 2, 2004, str. 265-301)
    Vrsta gradiva - članek, sestavni del
    Leto - 2004
    Jezik - angleški
    COBISS.SI-ID - 60897793
    DOI

vir: Annals of physics. - ISSN 0003-4916 (Vol. 310, no. 2, 2004, str. 265-301)

loading ...
loading ...
loading ...

Vnos na polico