gpdimonderose tags: no_tag space and time.
We shall speak alternately and shall give three lectures each, followed by a discussion on our di erent approaches.
I should emphasize that these will be technical lectures.
We shall assume a basic knowledge of general relativity and quantum theory.
There is a short article by Richard Feynman describing his experiences at a conference on general relativity.
I think it was the Warsaw conference in 1962.
It commented very unfavorably on the general competence of the people there and the relevance of what they were doing.
That general relativity soon acquired a much better reputation, and more interest, is in a considerable measure because of Roger's work.
Up to then, general relativity had been formulated as a messy set of partial di erential equations in a single coordinate system.
People were so pleased when they found a solution that they didn't care that it probably had no physical signi cance.
However, Roger brought in modern concepts like spinors and global methods.
He was the rst to show that one could discover general properties without solving the equations exactly.
It was his rst singularity theorem that introduced me to the study of causal structure and inspired my classical work on singularities and black holes.
I think Roger and I pretty much agree on the classical work.
However, we di er in our approach to quantum gravity and indeed to quantum theory itself.
Although I'm regarded as a dangerous radical by particle physicists for proposing that there may be loss of quantum coherence I'm de nitely a conservative compared to Roger.
I take the positivist viewpoint that a physical theory is just a mathematical model and that it is meaningless to ask whether it corresponds to reality.
All that one can ask is that its predictions should be in agreement with observation.
I think Roger is a Platonist at heart but he must answer for himself.
Although there have been suggestions that spacetime may have a discrete structure ......ah..essere disvelanza della monadea vuota in exstasy, quale deliranza che danza nella diradanza sublime dell'aletheia dell'essere, senza il nulla, senza dei, né eroi, né entità o superentità, solo il suo evento che si dà.
Mi viene in sogno l'evento della dea che si dà nella diradanza che danza con l'imago dell'eternità imaginaria.
Mi viene in sogno con la luce dell'eterno ritorno imaginario, all'alba di un altro giorno....ho solo un ultimo desiderio nei pensieri ma non mi viene mai in mente, né oggi né mai.
Né svenderò i sogni a chi si svela con [...]

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