Unified field theory classical field theory and, two years later, that of Theodor Kaluza, who extended General Relativity to five dimensions. Continuing in this latter direction, Oscar Klein proposed in 1926 that the fourth spatial dimension be curled up into a small, unobserved circle. In Kaluza–Klein theory, the gravitational curvature of the extra spatial direction behaves as an additional force similar to electromagnetism. These and other models of electromagnetism and gravity were pursued by Albert Einstein in his attempts at a classical unified field theory. By 1930 Einstein had already considered the Einstein–Maxwell–Dirac System [Dongen]. This system is (heuristically) the super-classical [Varadarajan] limit
Unified Theory (band) only. "Unified Theory" went on to sell over 16,000 albums by 2002. "California" and "Wither" were both released as singles. However, with the exception of Seattle, most major market radio stations avoided playing "California." Critically, the album received generally positive reviews. Reviewing for Allmusic, Greg Prato stated that "Unified Theory's self-titled debut shows that Shinn has brought a more modern rock sound to the proceedings, mixing Jeff Buckley and Radiohead with Smith and Thorn's retro rock stylings" and that the "12-track debut is a refreshing break from the norm." Lina Lecaro, of the "Los Angeles Times", describes the album as