A physician who specializes in pain management got the go-ahead to pursue accusations that another doctor who happens to have the same name took advantage of that coincidence to beef up business for his “pill mill.”In a written opinion last week, U.S. District Judge Sara L. Ellis did not rule on the merits of Dr. Jay Joshi’s allegations that Dr. Jay K. Joshi misappropriated his reputation and credentials.But Ellis held the plaintiff’s allegations were sufficient to allow him to pursue claims for …