Bruce Nappi

  • The confusion over what precisely defines “Special Relativity” (SR) has been going on in CNPS, without resolution, for a very long time. I pulled together this overview hoping to move this problem forward.

    The differences appear to rest on the following basic issues:

    1. The members can not agree on a single interpretation for the term “Sp…[Read more]

  • Bruce Nappi replied to the topic Time and Clocks in the forum Group logo of RelativityRelativity 9 months, 3 weeks ago

    # ## Bruce 10/7/16 8:32 AM EDT (clocks)

    From the recent discussions about time, I believe the problem is clear. There is still enough “ambiguity” in many concpets that confusion is certain. So, all those following this subject please help with the following goal:

    Please try to provide a concise definition for the clocks and time that you are…[Read more]

  • Bruce Nappi replied to the topic Time and Clocks in the forum Group logo of RelativityRelativity 9 months, 3 weeks ago

    # ## Harry 10/7/16 7:42 AM EDT (clocks)

    The claim is that it is possible to create multiple inertial frames of reference in which the velocity of light is the same in all of them. This is where the ambiguity enters, as to how exactly that is to be done. It is preceded by the discussion which says there is no absolute simultaneity. That is needed…[Read more]

  • Bruce Nappi replied to the topic Time and Clocks in the forum Group logo of RelativityRelativity 9 months, 3 weeks ago

    # ## Harry 10/7/16 7:20 AM EDT (clocks)

    I totally agree that the concept of time is ambiguous in SR. This needs to be corrected. I think that there actually is no problem at all once we come to agreement that the so called Einstein synchronization is nothing more than the Newtonian concept of simultaneous universal time applied to the so called…[Read more]

  • Bruce Nappi replied to the topic Time and Clocks in the forum Group logo of RelativityRelativity 9 months, 3 weeks ago

    # ## Roger 10/7/16 2:40 AM EDT (clocks)
    “time” is another thing Einstein leaves ambiguous as to how he wants to treat it. He says time is “that which a clock measures”- what is called an operational definition. But he doesn’t really say that the operation should be “Einstein synchronization” ; never addresses issues like – whether there is only…[Read more]

  • Bruce Nappi replied to the topic Time and Clocks in the forum Group logo of RelativityRelativity 9 months, 3 weeks ago

    # ## Harry 10/7/16 2:19 AM EDT (clocks)
    Bruce,

    It appears from the comments so far that you will not be able to get an agreement regarding the basic definition of time that can form the basis of a discussion.

    Here is my proposal for the basis of the discussion. Lets see if we can get agreement on this.

    Einstein’s thesis is that what a clock…[Read more]

  • Bruce Nappi replied to the topic Time and Clocks in the forum Group logo of RelativityRelativity 9 months, 3 weeks ago

    # ## Stephane 10/6/16 11:46 PM EDT (clocks)
    Time in physics has a very specific meaning; it has an operational definition. This is SR’s ‘time’. Its the *value* on a given clock at the location of the event in question.

    When one speaks of ‘time’, one MUST specify the frame and the event and synch procedure. In SR, these are the inertial frames,…[Read more]

  • Bruce Nappi replied to the topic Time and Clocks in the forum Group logo of RelativityRelativity 9 months, 3 weeks ago

    # ## Ian 10/6/16 11:15 PM (clocks)

    … regarding clocks measuring time, they actually don’t directly measure time … Clocks are really just a device that repeats itself to a fraction of the orientation of the earth (the second), so it’s not really measuring ‘time’ as such, and as I’ve mentioned before, this slippery concept of time is something…[Read more]

  • Bruce Nappi replied to the topic Time and Clocks in the forum Group logo of RelativityRelativity 9 months, 3 weeks ago

    # ## Bruce 10/6/16 2:07 PM EDT (clocks)
    Harry,

    Thanks for taking the time for this in-depth reply. This is what I was hoping for, with the intent of capturing it for the Glossary in the tracking MAP.

    It is a good example of how what seems like a simple concept, can easily go astray simply due to lack of precision in the definitions. Here’s one…[Read more]

  • Bruce Nappi replied to the topic Time and Clocks in the forum Group logo of RelativityRelativity 9 months, 3 weeks ago

    # ## Harry 10/6/16 1:02 PM EDT (clocks)
    I would like to start a separate discussion thread and focus the discussion on this item as a start. We can call this thread definition of clocks and synchronization. {Expanded to Clocks and Time for this forum}

    Einstein’s thesis is that what a clock measures is time. So he attempts to construct a theory…[Read more]

  • This is a discussion about the role of clocks and time as they relate to the Special Theory of Relativity. The topic will be started by entering a long list of posts from an off-site email discussion mostly made up of CNPS members.

    The format of entries will be a comment ID followed by the posted comment. The ID will show the poster’s name…[Read more]

  • This is a discussion about the role of clocks and time as they relate to the Special Theory of Relativity. The topic will be started by entering a long list of posts from an off-site email discussion mostly made up of CNPS members.

  • Bruce Nappi became a registered member 1 year, 4 months ago

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