Positive Scalar Curvature due to the Cokernel of the Classifying Map

Abstract: This paper contributes to the classification of positive scalar curvature metrics up to bordism and up to concordance. Let $M$ be a closed spin manifold of dimension $\ge 5$ which admits a metric with positive scalar curvature. We give lower bounds on the rank of the group of psc metrics over $M$ up to bordism in terms of the corank of the canonical map $KO_(M)\to KO_(B\pi_1(M))$, provided the rational analytic Novikov conjecture is true for $\pi_1(M)$.