Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1999-04-09
Phys.Lett. B459 (1999) 473-481
Physics
High Energy Physics
High Energy Physics - Phenomenology
16 pages, revtex., version to be published in Phys. Lett. B
Scientific paper
10.1016/S0370-2693(99)00688-7
In the presence of fields without superpotential but with large vevs through D-terms the mass-squared of the inflaton in the context of supergravity hybrid inflation receives positive contributions which could cancel the possibly negative K$\ddot{a}$hler potential ones. The mechanism is demonstrated using K$\ddot{a}$hler potentials associated with products of $SU(1,1)/U(1)$ K$\ddot{a}$hler manifolds. In a particularly simple model of this type all supergravity corrections to the F-term potential turn out to be proportional to the inflaton mass allowing even for an essentially completely flat inflationary potential. The model also allows for a detectable gravitational wave contribution to the microwave background anisotropy. Its initial conditions are quite natural largely due to a built in mechanism for a first stage of ``chaotic'' D-term inflation.
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