TY - JOUR
T1 - Visible branes with negative tension in heterotic M-theory
AU - Donagi, Ron Y.
AU - Khoury, Justin
AU - Ovrut, Burt A.
AU - Steinharclt, Paul J.
AU - Turok, Neil
PY - 2001
Y1 - 2001
N2 - It is shown that there exist large classes of BPS vacua in heterotic M-theory which have negative tension on the visible orbifold plane, positive tension on the hidden plane and positive tension, physical five-branes in the bulk space. Explicit examples of such vacua are presented. Furthermore, it is demonstrated that the ratio, ß/ a\, of the bulk five-brane tension to the visible plane tension can, for several large classes of such vacua, be made arbitrarily small. Hence, it is straightforward to find vacua with the properties required in the examples of the Ekpyrotic theory of cosmology -a visible brane with negative tension and ß/\ct\ small. This contradicts recent claims in the literature.
AB - It is shown that there exist large classes of BPS vacua in heterotic M-theory which have negative tension on the visible orbifold plane, positive tension on the hidden plane and positive tension, physical five-branes in the bulk space. Explicit examples of such vacua are presented. Furthermore, it is demonstrated that the ratio, ß/ a\, of the bulk five-brane tension to the visible plane tension can, for several large classes of such vacua, be made arbitrarily small. Hence, it is straightforward to find vacua with the properties required in the examples of the Ekpyrotic theory of cosmology -a visible brane with negative tension and ß/\ct\ small. This contradicts recent claims in the literature.
KW - M-theory
KW - Physics of the early universe
UR - http://www.scopus.com/inward/record.url?scp=33744776627&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=33744776627&partnerID=8YFLogxK
U2 - 10.1088/1126-6708/2001/11/041
DO - 10.1088/1126-6708/2001/11/041
M3 - Article
AN - SCOPUS:33744776627
VL - 5
SP - XXLI-27
JO - Journal of High Energy Physics
JF - Journal of High Energy Physics
SN - 1126-6708
IS - 11
ER -