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on “the extensive discussions of de Broglie’s pilot-wave theory” and,
on Born and Heisenberg’s presentation of a ‘quantum mechanics’ apparently lacking in wave function collapse or fundamental time evolution.

— Antony Valentini (2009)



[T]here are subtler difficulties that arise when we go over from considering the Universe simply as a very large system to considering it as the totality of what exists.

Dennis Sciama (1971)



All one can say is that if the Universe was originally uniform then the small irregularities that arise from statistical fluctuations would not develop into galaxies in the time available.

Dennis Sciama (1971)



At the foundations of physics there is today confusion and incoherence. … GR and QM have opened a revolution. The revolution is not yet complete.

Carlo Rovelli (2004)



[A]t small scales there should be quanta of space and time ….

Carlo Rovelli (2004)



The quest for quantum gravity can be separated into three main lines of research. … They are often denoted “covariant,” “canonical,” and “sum-over-histories,” even if these names can be misleading and are often used interchangeably. They cannot be characterized by a precise definition. . . .

Carlo Rovelli (2004)



Einstein’s major discovery is that spacetime and gravitational field are the same object.

Carlo Rovelli (2004)



[In the Loop Quantum Gravity picture] these “quanta of gravity” do not live immersed in a spacetime. They are space. The idea of space as the inert “container” of the physical world has disappeared.

Carlo Rovelli (2004)



Quantum gravity is therefore the study of the structure of spacetime at the quantum scale.

Carlo Rovelli (2010)