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Endervhar
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Paul Nahin (Time Machines. 1993) draws on the work of Murray MacBeath to demonstrate how a scenario in which two people, traveling through time in opposite directions, might be able to communicate. His two characters, Jim and Midge are separated by a window.
“Now, at t0 Jim brings a computer to the window. He programs it to wait for four days, until t4, and then to display the following message on the screen: ‘This message is from Jim, who experiences time in the sense opposite to yours. Please study the following questions and display your answers on a computer screen three days from now.’
Diagram.1 (Nahin’s Figure 9)
earlier.......Jim (normal time)..........later
t0......t1......t2......t3......t4
T4......T3......T2.....T1......T 0
LATER.......MIDGE (reversed time)........EARLIER
Jim’s message ends with a list of questions. Since this will appear at t4, Midge sees it at what we will now call T0. As requested, she brings her computer to the window, enters the answers to Jim’s questions, and programs the machine to display them (after a three-day delay) on its screen. Thus, at T3, which is Jim’s t1, Jim sees Midge’s computer screen light up with: ‘Hi, Jim. This is Midge. The answers to your questions are at the end of this message. Now, I’ve got some questions for you. Please display the answers two days from now.’ Midge’s message ends with Jim’s answers and her list of questions. Jim sees Midge’s message at t1, enters the answers to her questions and sets the machine to answer after a two-day delay. At t3, which is Midge’s T1 – and by now you see how the process goes. It’s cumbersome, but it does work.”
I have found a few reasons why I think this would not work, but would be interested to know the thoughts of others with more scientific knowledge than myself.
“Now, at t0 Jim brings a computer to the window. He programs it to wait for four days, until t4, and then to display the following message on the screen: ‘This message is from Jim, who experiences time in the sense opposite to yours. Please study the following questions and display your answers on a computer screen three days from now.’
Diagram.1 (Nahin’s Figure 9)
earlier.......Jim (normal time)..........later
t0......t1......t2......t3......t4
T4......T3......T2.....T1......T 0
LATER.......MIDGE (reversed time)........EARLIER
Jim’s message ends with a list of questions. Since this will appear at t4, Midge sees it at what we will now call T0. As requested, she brings her computer to the window, enters the answers to Jim’s questions, and programs the machine to display them (after a three-day delay) on its screen. Thus, at T3, which is Jim’s t1, Jim sees Midge’s computer screen light up with: ‘Hi, Jim. This is Midge. The answers to your questions are at the end of this message. Now, I’ve got some questions for you. Please display the answers two days from now.’ Midge’s message ends with Jim’s answers and her list of questions. Jim sees Midge’s message at t1, enters the answers to her questions and sets the machine to answer after a two-day delay. At t3, which is Midge’s T1 – and by now you see how the process goes. It’s cumbersome, but it does work.”
I have found a few reasons why I think this would not work, but would be interested to know the thoughts of others with more scientific knowledge than myself.