# Richard Schoen's 1988 Graduate Course on Scalar Curvature

In Autumn, 1988, when I was beginning my third year in graduate school at Stanford University, Richard Schoen taught a wonderful topics course on Scalar Curvature. The notes that I wrote up from that course have been widely circulated and cited in a number of research publications over the last 25 years. In order to make these notes more easily accessible, and with Rick's permission, I am making a scanned copy of them available as a pdf here on this web site. If you choose to cite these notes please include a link to this url so that others may access them.

The later portion of the notes consist of a detailed sketch of a proof of the compactness for constant scalar curvature metrics within a conformal class on a compact manifold in low dimensions (less than or equal to 8). A few years ago, through combined work of Brendle, Khuri, Marques and Schoen, the general case was resolved: compactness holds in dimensions less than or equal to 24 and is false in higher dimensions. Below I have included references to some of the relevant papers in this work. This is an incomplete list and I urge the interested reader to consult the references in the papers below for a complete history.

Dan Pollack's course notes from Richard Schoen's 1988 graduate course:
Pollack-notes-Schoen1988.pdf

Some relevant papers regarding compactness for the Yamabe problem:

Richard M. Schoen

**Variational theory for the total scalar curvature functional for Riemannian metrics and related topics.**

Topics in calculus of variations (Montecatini Terme, 1987), 120-154, Lecture Notes in Math., 1365, Springer, Berlin (1989).

Marcus Khuri, Fernando C. Marques, and Richard M. Schoen

**A compactness theorem for the Yamabe problem.**

J. Differential Geom. 81 (2009), no. 1, 143-196.

Fernando C. Marques

**Blow-up examples for the Yamabe problem.**

Calc. Var. Partial Differential Equations 36 (2009), no. 3, 377-397.

Simon Brendle and Fernando C. Marques

**Blow-up phenomena for the Yamabe equation II.**

J. Differential Geom. 81 (2009), no. 2, 225-250.

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