Other models, such as string theory, propose more dimensions, but those are coiled up too small to be seen.
Maybe the rest are on a grad-school full ride getting a Ph.D. in string theory.
The entirety of string theory is the hidden reality, but we are able to experience only one of its possible configurations.
I work in string theory, the field that eluded Einstein for the last 30 years of his life.
One of the embarrassments of string theory has been its inability to tell us why exactly our universe is the way it is.
a hypothesis describing elementary particles as tiny one-dimensional objects (strings) rather than zero-dimensional points
Old English streng "line, cord, thread," from Proto-Germanic *strangiz (cf. Old Norse strengr, Danish streng, Middle Dutch strenge, Dutch streng, Old High German strang, German Strang "rope, cord"), from *strang- "taut, stiff," from PIE root *strenk- "tight, narrow; pull tight, twist" (see strain). Gradually restricted by early Middle English to lines that are smaller than a rope. Sense of "a number of objects arranged in a line" first recorded late 15c.
Old English meaning "ligaments, tendons" is preserved in hamstring, heartstrings. Meaning "limitations, stipulations" (1888) is American English, probably from the common April Fool's joke of leaving a purse that looks full of money on the sidewalk, then tugging it away with an attached string when someone stoops to pick it up. To pull strings "control the course of affairs" (1860) is from the notion of puppet theater. First string, second string, etc. in athletics (1863) is from archers' custom of carrying spare bowstrings in the event that one breaks. Strings "stringed instruments" is attested from mid-14c. String bean is from 1759; string bikini is from 1974.
c.1400, "to fit a bow with a string," from string (n.). Meaning "to thread (beads, etc.) on a string" is from 1610s. To string (someone) along is slang from 1902; string (v.) in this sense is attested in British dialect from c.1812.
Any of various theories in physics hypothesizing that space-time has more than four dimensions, and that some of the dimensions are exceedingly small and stringlike in shape. Elementary particles in string theory are understood as standing waves in such space-time strings, rather than as pointlike objects. String theories attempt to unify gravity with the other fundamental forces.