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We initiate the study of wall crossing phenomena in orientifolds of localtoric Calabi-Yau 3-folds from a topological string perspective. For thispurpose, we define a notion of real Donaldson-Thomas partition function at thelarge volume, orbifold and non-commutative point in Kaehler moduli space. As abyproduct, we refine the constant map contribution to the partition function ofthe real topological string on a local toric background. We conjecture thegeneral relation between the real large volume and realnon-commutative/orbifold Donaldson-Thomas partition function of orientifolds oflocal toric Calabi-Yau 3-folds without compact divisors. The conjecturedrelation is confirmed at hand of the conifold and local A_n singularity, forwhich we explicitly derive the real non-commutative/orbifold Donaldson-Thomaspartition function combinatorially.

Wall Crossing Phenomenology of Orientifolds