Particle-Wave Duality Contention

[Dmitry67]

I agree that the energy in photons has a mass equivalence, which will curve space. But, there is no evidence that photons are accelerated by gravity. A photon shot directly away from a gravitational field will never lose velocity due gravitational acceleration. If it were a particle with rest mass, like an electron, it would; but it is not. This shows that a wave does not have weight.

Photons can't 'accelerate' because they are moving at c
But they can change direction and they can jain or lose energy because of the gravitagtion.
For example, photon falling down in Earth gravitation field gain energy (confirmed experimentally!)

 

[Dmitry67]

Why then do we not get an interference pattern when the slits are observed? There are different results to the two-slit experiment if we observe the slits and if we do not observe the slits. This seems to me direct evidence that quantum objects behave differently depending on if they are observed or not.

Because to 'observe' means 'to interact'.
If you do 2 slit experiment, say, with electrons, you can use, for example, light (photons) o detect which slit electorn used. So you actually hit/disturb electorns.

So there is absolutely no 'enigma': like in classical physics you don't find strange that billiard balls move straight, but if you 'observe' them using another billiard balls, hitting them, they change the direction.

 

[tom.stoer]

As I said, two crashing cars behave differently than two non-crashing cars; but in both cases the same physical laws apply. If you change the experiment (location detection vs. interference w/o location detection) the results change as well.