Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2004-05-26
JHEP 0408:030,2004
Physics
High Energy Physics
High Energy Physics - Theory
36 pages, one figure, uses JHEP-style; v2: Minor corrections and references added
Scientific paper
10.1088/1126-6708/2004/08/030
Among the inflationary models based on string theory, the D3/D7 model has the advantage that the flatness of the inflaton potential can be protected even with moduli stabilization. However, the Abrikosov-Nielsen-Olesen BPS cosmic strings produced at the end of original D3/D7 inflation lead to an additional contribution to the CMB anisotropy. To make this contribution consistent with the WMAP results one needs an extremely small gauge coupling in the effective D-term inflation model. Such couplings may be difficult to justify in string theory. Here we develop a generalized version of the D3/D7 brane model, which leads to semilocal strings, instead of the topologically stable ANO cosmic strings. We show that the semilocal strings have unbroken supersymmetry when embedded into supergravity with FI terms. The energy of these strings is independent of their thickness. We confirm the existing arguments that strings of such type disappear soon after their formation and do not pose any cosmological problems, for any value of the gauge coupling. This should simplify the task of constructing fully realistic models of D3/D7 inflation.
Dasgupta Keshav
Hsu Jonathan P.
Kallosh Renata
Linde Andrei
Zagermann Marco
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