Is there any experimental or observationa evidence that massless photons warp spacetime?(adsbygoogle = window.adsbygoogle || []).push({});

Of course I know that in GR everything that has energy curves spacetime, including massless particles, but what-if this is wrong, and that particles must have mass to act as a "charge" for gravity? what if we modify gravity so that massless particles have no effect on spacetime itself. (but can be themselves affected by curved spacetime)

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# Is there any exp. evid that massless photons cuves spacetime?

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