In a field space with metric (G_ab(\phi)), the distance conjecture is applied to the geodesic length, which can be reduced by turning trajectories. The effective field excursion is
[
\Delta\phi_\rm geo= \int \sqrtG_ab,\dot\phi^a\dot\phi^b,dt .
]
Models such as hyperinflation and angular inflation exploit large curvature of the field‑space manifold to achieve many e‑folds with (\Delta\phi_\rm geo\ll M_!P). The gradient bound can also be softened if the inflaton moves orthogonal to the gradient of (V).
Refinement: Either the gradient condition above holds, or the Hessian obeys
[ M_!P^2,\frac\rm min,\nabla_i\nabla_j VV;\leq;-c';\sim;- \mathcalO(1). ]
Both conditions cannot be simultaneously violated.
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From the SDC we have (\Delta\phi\lesssim \frac1\lambdaM_!P). For a monomial potential (V\propto\phi^p), the field excursion during inflation is
[
\Delta\phi \simeq \sqrt2p,N,M_!P,
]
implying that models with (p\gtrsim 1) and (N\sim 50!-!60) typically violate the SDC unless (\lambda) is substantially below unity.