To publish a groundbreaking physics paper, the author should select a suitable scientific journal, such as those published by the American Physical Society, and follow the submission guidelines provided on the journal's website. Scientific journals are platforms where articles undergo peer review by experts before publication. For significant theories, if the work is extensive, it may need to be divided into smaller articles for submission to journals like the Journal of High Energy Physics or Physical Review Letters. Alternatively, if the work is too large to fit into standard journal formats, the author might consider publishing it as a monograph through a book publisher or self-publishing it as a PDF on platforms like ArXiv, which allows for broader dissemination of research, although it is not peer-reviewed.