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It is not the case that Therefore the projective structure alone is insufficient to prevent arbitrary realignment of all material worldlines, not merely freely-falling ones.
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Reasons For
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Reason for
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1.
Affine structure on projective space does constrain geodesics; arbitrary worldline realignment violates affine-geometric consistency conditions.
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2.
Matter stress-energy couples to metric structure, which imposes additional constraints beyond pure projective/conformal invariance.
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3.
Physical clocks and particle interactions provide operational definitions that break projective symmetries and fix worldline identities.
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Reasons Against
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Reason against
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1.
Projective structure encodes only incidence relations and cross-ratios, not metric properties needed to distinguish physical worldlines.
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2.
Conformal rescalings preserve null cones but leave timelike geodesics underdetermined, allowing arbitrary reparameterization of material paths.
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3.
Without additional structure beyond projective geometry, no constraint prevents simultaneous relabeling of all massive particle trajectories.
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