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Simultaneity 2. A contradiction related to local simultaneity.

Author:

Leon, Antonio

Category:

Research Papers

Sub-Category:

Relativity Theory

Language:

English

Date Published:

January 3, 2023

File:

/Research Papers-Relativity Theory/Download/9459

Downloads:

Keywords:

local simultaneity, universal simultaneity, phase difference in synchronization

Abstract:

This short chapter contains a single argument that could have been included as a section in the previous chapter. But the argument is so simple and conclusive that I have found it convenient to devote a chapter of its own to it. Indeed, a flagrant contradiction derived directly from the phase difference in relativistic synchronization (lack of simultaneity) is demonstrated here. The absence of a 'universal now' is one of the most debated aspects of special relativity. The rotating bar argument developed in this chapter demonstrates in a very simple and conclusive way that, indeed, the absence of a 'universal now' is inconsistent. Consequently, we could again consider the possibility of universally simultaneous events and simultaneous processes.

Comments

Johannes Andersen:

I was using the Cray-1, it was in late 1970's BTW. The clock was 80MHz, but it was pipelined to produce 1 floating point result per cycle, or sometimes 2 if you could use the same instruction for different things such as * and + as in matrix multiply. However, the computer was cooled by freon gas and every board was equalised to draw constant current to prevent interference. Then it had famous love seats and SECDED, a big marketing slogan, but difficult to say by mouth. Single Error Correction Double Error Detection. Anyway, nothing was moving, so time dilation didn't apply. Electrons don't move very much, it's more like a Mexican wave.

Posted: January 10, 2023 @ 1:16:40 pm

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Steve Olah(Laguna Woods, United States):

Speaking of simultaneous events....
In 1960 there were no microchips. Seymour Cray designed his supercomputer with silicon transistors. The length of lines between all circuits had to be budgeted because of the 1ns=1ft physical rule. Clock signals had to be simultaneous at every register circuits.
In today's microchips are less than 10 mm on the side. Clock driver lines and transistors are carefully laid out and budgeted for the same reason 1n=1ft, but clock frequencies are in the giga Hertz's. Timing budgets are measured in fractions of picoseconds.
This should give everybody a feel for the practical meaning of simultaneity.

Posted: January 04, 2023 @ 1:31:49 am

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1 Replies

Johannes Andersen:

I was using the Cray-1, it was in late 1970's BTW. The clock was 80MHz, but it was pipelined to produce 1 floating point result per cycle, or sometimes 2 if using the same instruction for different things such as * and + as in matrix multiply. However, the computer was cooled by freon gas and every board was equalised to draw constant current to prevent interference. Then it had famous love seats and SECDED, a big marketing slogan, but difficult to say by mouth. Single Error Correction Double Error Detection. Anyway, nothing was moving, so time dilation didn't apply. Electrons don't move very much, it's more like a Mexican wave.

Posted: January 10, 2023 @ 1:11:32 pm