Knowra Geometrized unit system Geometrized unit system A unit convention that sets constants such as the speed of light and Newton’s gravitational constant to one. It expresses physical quantities in compatible powers of length, simplifying equations in relativity.
Natural units : A unit convention that sets selected fundamental constants to one, simplifying equations in theoretical physics. Geometrized units are a natural-unit system especially suited to gravity and spacetime.
SI base units : The seven independent units that define the International System of Units. They provide the conventional starting units converted into geometrized form.
Schwarzschild metric : The spherically symmetric vacuum solution of Einstein’s field equations outside a nonrotating mass. Its compact form uses the mass parameter as a length in geometrized units.
Atomic units : A unit system used in atomic physics that sets the electron mass, elementary charge, and reduced Planck constant to one. It is tailored to atomic interactions rather than gravitational geometry.
Speed of light : The speed at which light propagates in vacuum, exactly 299,792,458 metres per second. Setting this constant to one equates time and distance units.
Mass–energy equivalence : The equivalence of mass and energy expressed by Einstein’s relation E = mc². With light speed set to one, mass and energy share the same units.
Kerr metric : The rotating, uncharged black-hole solution of Einstein’s field equations. Its mass and angular momentum parameters take length-based forms in this convention.
Stoney units : A natural unit system based on the speed of light, Newton’s constant, and the elementary charge. It uses electric charge rather than Planck’s constant as a defining scale.
Newtonian gravitational constant : The constant that sets the strength of gravity in Newton’s law of universal gravitation. Setting it to one brings mass into the same unit system as length.
Time : A dimension of physical measurement that orders events and quantifies intervals between them. Setting light speed to one lets time intervals be measured as lengths.
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