What is a bankruptcy court's subject matter jurisdiction over a civil proceeding arising from a bankruptcy?

The bankruptcy court's subject matter jurisdiction is defined by statute. Under 28 U.S.C. 1334(b), a bankruptcy court has jurisdiction over "all civil proceedings arising under title 11, or arising in or related to cases under title 11." "Arising under title 11" describes those proceedings that involve a cause of action created or determined by a statutory provision in the bankruptcy code. Harris v. Wittman (In re Harris), 590 F.3d 730, 737 (9th Cir. 2009). "Proceedings 'arising in' a bankruptcy are generally referred to as 'core' proceedings, and essentially are proceedings that would not exist outside of bankruptcy. . . ." In re Pegasus Gold Corp., 394 F.3d at 1193.