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It does't really make much sense to talk about a tree-level truncation (it helps for calculations, but that's it) or to take the first Feynman diagram as a true representation of reality. By the way, in your $e^- e^- \to e^- e^-$ example, the whole notion of spatial separation is ill-defined since this is a t-channel process. If going from virtual to real ...

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To understand the origin of black body radiation, which is what every material body with a temperature T has been measured to emit, one has to go to quantum statistical mechanics. Atoms and molecules, to start with, in any ensemble, interact with the electromagnetic radiation. At that level, the processes are quantum mechanical. In quantum mechanics the ...

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The true mediators of forces are the quantum fields. A thorough discussion of virtual particles and their properties (and possible way of existence) is given in the following two recent essays of mine: The Physics of Virtual Particles Misconceptions about Virtual Particles From the introduction to the second essay: ''virtual particles are defined ...

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Black holes banish matter into cosmic voids http://www.spacedaily.com/reports/Black_holes_banish_matter_into_cosmic_voids_999.html But Haider's team also found that a surprising fraction of normal matter - 20% - is likely to be have been transported into the voids. The culprit appears to be the supermassive black holes found in the centres of ...

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If space time is accelerating away from itself everywhere due to dark energy, In general , given asymmetric mass distributions, gravitational waves are generated from the space time distortions. could this acceleration be the cause of virtual particles, Assuming quantization of gravity and the reality of gravitons, the gravitons are not virtual ...

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