Re: GR ?


"Tom Roberts" <tjroberts@xxxxxxxxxx> wrote in message
news:wH0Ae.2598$0w2.964@xxxxxxxxxxxxxxxxxxxxxxxxxxxxx
| Significant Zero wrote:
| > Would anybody that understands GR dispute the statement that the
geometry of
| > GR is non-Euclidean due deformation of length and duration under
presence
| > of mass and that this deformation has the aspect and equivalence to
energy?
|
| You have too many unacknowledged puns in there for your statement to
| make sense (e.g. on "deformation", "length", "duration", ...). And there
| are undefined phrases in there, too ("deformation of length and
| duration", "presence of mass", "aspect and equivalence to energy").

Thanks for the reply Tom but would it not be more constructive and useful to
ask me what I mean if you don't understand ? Also is it necessary to so over
complicate something as to make any determination about it impossible.

|
| In GR there is a definite relationship between the metric of spacetime
| and the energy-momentum tensor of matter. The metric determines the
| geometry, and the energy-momentum tensor is the density of mass, energy,
| and momentum in spacetime.

I think these statements indicate an incorrect conceptualisation of the
physical facts behind the theory.

| But note there are manifolds in GR that have
| curvature but no mass (e.g. the electrovacuum manifolds, the
| gravitational-wave manifolds, the geon manifolds, etc.).

As far as I understand it these manifold are not fully experimentally
confirmed.

|
| I think your statement is headed in the right direction, but is phrased
| too poorly to know for sure.
|
| As J.A.Wheeler said, "Space tells matter how to move, and matter tells
| space how to curve." But like most sound bites this is not a precise
| statement of GR.
|
|
| Tom Roberts tjroberts@xxxxxxxxxx


.

Relevant Pages

  • Re: GR ?
    ... >> GR is non-Euclidean due deformation of length and duration under presence ... > the energy-momentum tensor of matter. ... The metric determines the geometry, ... But note there are manifolds in GR that have ...
    (sci.physics.relativity)
  • Re: GR ?
    ... > | and the energy-momentum tensor of matter. ... > | geometry, and the energy-momentum tensor is the density of mass, energy, ... humbly suggest you are not in a position to know if the physical facts are ... > | curvature but no mass (e.g. the electrovacuum manifolds, ...
    (sci.physics.relativity)
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