Mathematical Definition
The stress-energy tensor of a relativistic pressureless fluid can be written in the simple form
Here
- the world lines of the dust particles are the integral curves of the velocity vector ,
- the matter density is given by the scalar function .
Read more about this topic: Dust Solution
Famous quotes containing the words mathematical and/or definition:
“An accurate charting of the American woman’s progress through history might look more like a corkscrew tilted slightly to one side, its loops inching closer to the line of freedom with the passage of time—but like a mathematical curve approaching infinity, never touching its goal. . . . Each time, the spiral turns her back just short of the finish line.”
—Susan Faludi (20th century)
“The very definition of the real becomes: that of which it is possible to give an equivalent reproduction.... The real is not only what can be reproduced, but that which is always already reproduced. The hyperreal.”
—Jean Baudrillard (b. 1929)