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<blockquote data-quote="tomBitonti" data-source="post: 6873495" data-attributes="member: 13107"><p>The issue is how to reason about the motion of the particle after it passes through the double slits. One chooses a mode of reasoning, then uses it to determine expected outcomes, then compares those outcomes with experimental results as a test of the mode of reasoning.</p><p></p><p>Then, there is an equation which describes the probability of a particle being at a particular location (for a certain class of measurements), and an amplitude (for a different class).</p><p></p><p>For a self intersection, how do we decide to use probabilities instead of amplitudes? We use amplitudes for the particle arriving at a detector. We use simple probabilities for the particle interacting with itself. Why? What is different about these two types of events?</p><p></p><p>Edit1: Let me ask in this way: When a particle moves through a double slit, can we describe the motion as the particle moving simultaneously through both slits? Or, must we say that a field describing the probable location of the particle moves through the slits simultaneously?</p><p></p><p>Edit2: The line of reasoning that led to the question of self-interaction was the possible interaction of two photons in free space, where the two EM fields have a chance to interact with a virtual electron. The local description of that interaction: Two EM fields meeting in free space, seems exactly the same -- locally -- as the interaction of two segments of the EM fields of a single photon.</p><p></p><p>Thx!</p><p>TomB</p></blockquote><p></p>
[QUOTE="tomBitonti, post: 6873495, member: 13107"] The issue is how to reason about the motion of the particle after it passes through the double slits. One chooses a mode of reasoning, then uses it to determine expected outcomes, then compares those outcomes with experimental results as a test of the mode of reasoning. Then, there is an equation which describes the probability of a particle being at a particular location (for a certain class of measurements), and an amplitude (for a different class). For a self intersection, how do we decide to use probabilities instead of amplitudes? We use amplitudes for the particle arriving at a detector. We use simple probabilities for the particle interacting with itself. Why? What is different about these two types of events? Edit1: Let me ask in this way: When a particle moves through a double slit, can we describe the motion as the particle moving simultaneously through both slits? Or, must we say that a field describing the probable location of the particle moves through the slits simultaneously? Edit2: The line of reasoning that led to the question of self-interaction was the possible interaction of two photons in free space, where the two EM fields have a chance to interact with a virtual electron. The local description of that interaction: Two EM fields meeting in free space, seems exactly the same -- locally -- as the interaction of two segments of the EM fields of a single photon. Thx! TomB [/QUOTE]
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