In physics, an infrared fixed point is a set of coupling constants, or other parameters that evolve from initial values at very high energies (short distance), to fixed stable values, usually predictable, at low energies (large distance). This usually involves the use of the renormalization group, a mathematical apparatus for theoretically evolving physical systems from one scale to another.
Conversely, if the length-scale decreases and the physical parameters approach fixed values, then we have ultraviolet fixed points. The fixed points are generally independent of the initial values of the parameters over a large range of the initial values. This is known as "universality".
Read more about Infrared Fixed Point: Statistical Physics, Particle Physics
Famous quotes containing the words fixed and/or point:
“... social evils are dangerously contagious. The fixed policy of persecution and injustice against a class of women who are weak and defenseless will be necessarily hurtful to the cause of all women.”
—Fannie Barrier Williams (1855–1944)
“I have touched the highest point of all my greatness,
And from that full meridian of my glory
I haste now to my setting. I shall fall
Like a bright exhalation in the evening,
And no man see me more.”
—William Shakespeare (1564–1616)