The
laws of physics do not distinguish between the past and the future. This
chapter begins by discussing CPT. C means changing particles of antimatter. P
means taking the mirror image so left and right are swapped for each other, and
T means reversing the direction of motion of all particles-in effect running
the motion backwards. The laws of physics that govern the behavior of matter
under all normal situations are unchanged under the operations CP on their own.
This means that life would be the same for inhabitants if another planet who
were our mirror images and who were made of antimatter. This chapter then
shifts into the arrows of time. The arrow of time is something that gives a
direction to time and distinguishes the past from the future. There are three
different kinds of arrows of time; Thermodynamic arrow, Psychological arrow,
and cosmological arrow.
I started off by watching a video by minute physics. He
explains that the past and future are different. But what is unknown is the
connection between past and future in physics. Every difference between the
past and the future is that the universe was orderly in the past and is getting
more and more disordered. Entropy increases with time. This video didn’t
really help me too much. It was really fun to watch because I now understand a
lot of concepts which he talks about but I wasn’t that informative.
I then started watching another video on
the arrow of time. This one says that the arrow of time is the fact that the
past is different than the future. The direction of time looking into the past
is known, while the direction of arrow looking into the future is unknown. The
Arrow of time is the directiveness from past to future. Some simple systems such as the earth going
around the sun does not have an arrow of time. The equations of the arrows of
time are reversible. We understand the equations behind the arrow of time, nut
we do not understand why they were put in at the Big Bang. There is an arrow because we are in the very influential
vicinity of the Big Bang.
http://preposterousuniverse.com/eternitytohere/faq.html
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