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Al último de mis comentarios a este respecto, Francis me responde:
«Jaime, en el artículo de Miguel Alcubierre titulado “Warp drive basics” (https://arxiv.org/abs/2103.05610) puedes leer: “Alcubierre bubbles, if it were possible to create them, could not be used as a means of superluminal travel. It only implies that the actions required to change the metric and create the bubble must be taken beforehand by some observer whose forward light cone contains the entire trajectory of the bubble.” Más claro, agua.»
Es una lástima que, poco tiempo después de hacer esta observación, Francis hubiera bloqueado los comentarios, porque quería indicarle que, si no sacamos de contexto lo citado, el significado varía sustancialmente, como se aprecia en el primer párrafo de la página 10 de este artículo:
«Thus, the bubble thus cannot be created, or controlled, by any action of the spaceship crew, which does not mean that Alcubierre bubbles, if it were possible to create them, could not be used as a means of superluminal travel. It only implies that the actions required to change the metric and create the bubble must be taken beforehand by some observer whose forward light cone contains the entire trajectory of the bubble.»