The Moving Finger writes; and, having writ,
Moves on: nor all thy Piety nor Wit
Shall lure it back to cancel half a Line,
Nor all thy Tears wash out a Word of it.
-Fitzgerald's translation of
The Rubáiyát of Omar Khayyam, 1859
From
3tags:
Study Suggests That Dark Energy Is The Reason Time Moves Forward
Ever since Lemaitre and Hubble’s first proposed it in the 1920s,
scientists and astronomers have been aware that the universe is
expanding. And from these observations, cosmological theories like the
Big Bang Theory and the “arrow of time” emerged. Whereas the former
addresses the origins and evolution of our universe, the latter argues
that the time flows in one-direction and is linked to the expansion of
space.
For many years, scientists have been trying to ascertain why this is.
Why does time flow forwards, but not backwards? According to new study
produced by a research team from the Yerevan Institute of Physics and
Yerevan State University in Armenia, the influence of dark energy may be
the reason for the forward-flow of time, which may make one-directional
time a permanent feature of our universe.
Today, theories like the arrow of time and the expansion of the
universe are considered fundamental facts about the universe. Between
measuring time with atomic clocks, observing the red shift of galaxies,
and creating detailed 3D maps that show the evolution of our universe
over the course of billions of years, one can see how time and the
expansion of space are joined at the hip.
The question of why this is the case though, is one that has
continued to frustrate physicists. Certain fundamental forces, like
gravity, are not governed by time. In fact, one could argue without
difficulty that Newton’s laws of motion and quantum mechanics work the
same forwards or backwards. But when it comes to things on the grand
scale like the behavior of planets, stars, and entire galaxies,
everything seems to come down to the second law of thermodynamics.
This law, which states that the total chaos (aka. entropy) of an
isolated system always increases over time, the direction in which time
moves is crucial and non-negotiable, has come to be accepted as the
basis for the arrow of time. In the past, some have ventured that if
the universe began to contract, time itself would begin to flow
backwards. However, since the 1990s and the observation that the
universe has been expanding at an accelerating rate, scientists have
come to doubt that this.
If, in fact, the universe is being driven to greater rates of
expansion – the predominant explanation is that “dark energy” is what is
driving it – then the flow of time will never cease being one way.
Taking this logic a step further, two Armenian researchers – Armen E.
Allahverdyan of the Center for Cosmology and Astrophysics at the Yerevan
Institute of Physics and Vahagn G. Gurzadyan of Yerevan State
University – argue that dark energy is the reason why time always moves
forward....MORE
So the first thing I think of when I read the headline about time 'moving forward' is that bit from the Rubiayat and I jot it down and the second thing I think of is "Am I remembering Eddington correctly?" so I go to Wikipedia's '
Arrow of Time' page and there at the bottom of the main article is the Fitzgerald and I realize I have no hope of ever being original in this life and time keeps on slippin', slippin' slippin' into the future.