Hidden in Plain Sight 3: The Secret Of Time
Dr. Andrew H. Thomas
Language: English
Pages: 168
ISBN: 1492285625
Format: PDF / Kindle (mobi) / ePub
You never knew theoretical physics could be so simple! What is time? Why does time exist? Why can't we remember the future? From Aristotle to Einstein, the mystery of time has puzzled philosophers and physicists down the ages. Enjoy a fascinating detective story to solve the mystery of time - but prepare to be amazed by the twist at the end of the tale!
Gravity from the Ground Up: An Introductory Guide to Gravity and General Relativity
An Elementary Survey of Celestial Mechanics (Dover Books on Physics)
Sieben kurze Lektionen über Physik
The Principia: Mathematical Principles of Natural Philosophy
tracks which were left by the two bolts. Alice finds the distance to each of the two marks is exactly the same. So that part of the experiment is satisfactory. Secondly, Alice realises that maybe the speed of the light was not the same from each of the two bolts. Any inequality in the speed could have resulted in the light from the two lightning bolts reaching her at the same time — even if the bolts did not hit the ground simultaneously. However, Alice had installed equipment to measure the
in which all events are real, Alice and Bob only experience a "slice" of real events at any moment along their world lines. The difference in the angles of their planes of simultaneity also explains how Alice and Bob can have vastly different experiences as to which events are real at great distances. This is due to their angled planes of simultaneity diverging greatly over vast distances (this is the reason for the Andromeda Galaxy paradox discussed in the previous chapter). So, at this
These generalised robots were given the name IGUS (Information Gathering and Utilizing Systems). Here is a cute example of an IGUS. We'll be seeing him again later: Hartle realised that the memory of an IGUS could be modelled as a series of computer registers: In the preceding diagram, the IGUS mechanism is contained within the dashed rectangle. The ever-changing information about the outside world is denoted by a pack of cards (shown on the left of the diagram), with the top card
the psychological arrow of time? To answer this, you will notice that there is a clear directionality in the way the captured information passes through the IGUS memory registers: the information always passes from left to right, from register R1 to register R4. It is always one-way traffic. This directionality results in an asymmetry in our memory: we can remember the past, but we cannot remember the future. This asymmetry is the reason we feel movement: we feel the past is somewhere "we have
to travel back to the past — and even affect past events — without introducing paradoxes. Consider the previous billiard ball example again. When the ball travels back to the past and emerges from the wormhole, it is possible that it deflects its earlier self into the wormhole, instead of away from it: There is now no paradox in this result. It is also a situation which can exist in a block universe: the past is affected, but events which have already occurred (i.e., set in stone in the
