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<blockquote data-quote="tomBitonti" data-source="post: 6278258" data-attributes="member: 13107"><p>Not sure what other particles do to change the situation, except to make the observations a lot messier. (Some bad astronomy pun deserves to be attached to "messier", but, being humor impaired, I'll leave that to others.)</p><p></p><p>Is a non-constant frame of reference a problem? There are all sorts of non-constant frames which are used in physics. There are distinctions made between inertial and non-inertial frames of reference (giving rise to pseudo-forces; for example, a frame of reference defined from a point on a spinning disk is non-inertial, and gives rise to centrifugal forces). But, I thought that a frame of reference was just a coordinate system, with more or less utility based on how well the frame exposes particular physical properties of the system which is being studied.</p><p></p><p>Is the problem perhaps that frames of reference (which is how we are used to thinking) don't work very well when applied to an expanding (or contracting) region of space-time, because of the non-uniform scale factor which results?</p><p></p><p>Note, I'm really not trying to say that we shouldn't treat recession velocities as special. I'm trying to understand exactly how we know they are special. At least, how do we know without doing a global analysis. For a pair of particles, how is a recession velocity distinguishable from simple motion?</p><p></p><p>Thx!</p><p></p><p>TomB</p></blockquote><p></p>
[QUOTE="tomBitonti, post: 6278258, member: 13107"] Not sure what other particles do to change the situation, except to make the observations a lot messier. (Some bad astronomy pun deserves to be attached to "messier", but, being humor impaired, I'll leave that to others.) Is a non-constant frame of reference a problem? There are all sorts of non-constant frames which are used in physics. There are distinctions made between inertial and non-inertial frames of reference (giving rise to pseudo-forces; for example, a frame of reference defined from a point on a spinning disk is non-inertial, and gives rise to centrifugal forces). But, I thought that a frame of reference was just a coordinate system, with more or less utility based on how well the frame exposes particular physical properties of the system which is being studied. Is the problem perhaps that frames of reference (which is how we are used to thinking) don't work very well when applied to an expanding (or contracting) region of space-time, because of the non-uniform scale factor which results? Note, I'm really not trying to say that we shouldn't treat recession velocities as special. I'm trying to understand exactly how we know they are special. At least, how do we know without doing a global analysis. For a pair of particles, how is a recession velocity distinguishable from simple motion? Thx! TomB [/QUOTE]
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