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Author Topic:   What is Time and Space
john6zx
Member (Idle past 4820 days)
Posts: 66
Joined: 01-27-2007


Message 201 of 204 (465437)
05-07-2008 12:10 AM
Reply to: Message 4 by NosyNed
07-29-2005 9:08 AM


Re: Uniform Time
Quote from NosyNed post>
Starting on page 233, Greene explains the uniformity of time.
quote:
--------------------------------------------------------------------------------
Using a slight variation on the ballon model, we can now understand more precisely how symmetry in space, even though space is expanding, yields a notion of time that applies uniformly across the cosmos.
This is a definition of notion.
NOTION -noun
1. a general understanding; vague or imperfect conception or idea of something: a notion of how something should be done.
2. an opinion, view, or belief: That's his notion, not mine.
3. conception or idea: his notion of democracy.
4. a fanciful or foolish idea; whim: She had a notion to swim in the winter.
So do you think that MR. Green is saying that time is basically a concept?

This message is a reply to:
 Message 4 by NosyNed, posted 07-29-2005 9:08 AM NosyNed has not replied

Replies to this message:
 Message 202 by cavediver, posted 05-07-2008 4:43 AM john6zx has replied

  
john6zx
Member (Idle past 4820 days)
Posts: 66
Joined: 01-27-2007


Message 203 of 204 (466080)
05-13-2008 1:26 AM
Reply to: Message 202 by cavediver
05-07-2008 4:43 AM


Re: Uniform Time
Originally posted by john6zx
So do you think that MR. Green is saying that time is basically a concept?
I guess that must depend on what you mean by 'concept'. Off the top of my head, 'time' refers colloquially to at least three different concepts in General Relativity, and mixing these up is at the heart of most of confusion in this topic. Time is a dimension, it is a coordinate, it is a path through space-time, it is a rate (of affine parameterisation) along that path - ah, that's four...
The definition of concept that I am using.
Concept:
1. a general notion or idea; conception.
2. an idea of something formed by mentally combining all its characteristics or particulars; a construct.
3. a directly conceived or intuited object of thought.
Alright, lets take this one step at a time.
First off I have to mention that I am not looking for answers that are right according to how others define time. I am discussing this topic with you, so when I ask a question I would like to hear what YOU think. I am not testing/challenging you with any of my questions. I just want to discuss the topic of time.
With that said, do you think that time is some sort of physical form of energy?
You mentioned General Relativity and time being a dimensions, a coordinate,and a path through space-time.
All that can be cleared up once it has been established if time is a physical thing or not.
It would also help you to find out if dimensions are physical things. Is there any scientific reference or definition that states dimensions are physical things? Or are they just concepts of measurement?
A coordinate. Is that a physical thing? Or just a concept used to define a position of a real or imagined thing?
As for the whole space-time subject, that term uses the idea of time so it would be best to find out what time is before using space-time to descibe time.
Again, I do not want you to think that this is some type of contest to see who can be "more" right than the other. I am not interested in that. I would just like to have a discussion on the nature of time.
Here is what I think time is:
Time is actually a consideration based on our perception of the movement of objects. There is a distance, there is a velocity of the objects travel, and that movement of that object or particle in relationship to its starting point and in relationship to its ending point is what gives us the idea of time. Time is a manifestation which has no existence beyond the idea of time brought about by the motion of objects, where an object may be either energy or matter. Time is not a thing that flows. Time does not move or cause things to move. It is this perception of motion which gives us the idea of time.
Thank You.
john6zx

This message is a reply to:
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