  The de Broglie-Bohm interpretation is a no-collapse interpretation, which
implies that we are in principle surrounded by empty waves generated by all
particles of the universe, empty waves that will never collapse. It is common
to establish an analogy between these pilot-waves and 3D radio-waves, which are
nearly devoided of energy but carry nevertheless information to which we may
have access after an amplification process. Here we show that this analogy is
limited: if we consider empty waves in configuration space, an effective
collapse occurs when a detector clicks and the 3ND empty wave associated to a
particle may not influence another particle (even if these two particles are
identical, e.g. bosons as in the example considered here).
