Results 251 to 260 of about 12,731,770 (288)

Colorectal Cancer Treatment Delay Thresholds and Metastasis Risk.

open access: yesJAMA Netw Open
Nguyen CM   +6 more
europepmc   +1 more source

From the Arrow of Time to the Arrow of Life

Earth, Moon, and Planets, 2006
Astrobiology, like many (but not all) sciences, must take into account questions of the “Why?”, “Where?”, “How?” and “When?” type. In this introductory chapter, we explain why, in this book, we will only consider two of these questions that are, moreover, deeply interrelated. Chronology is by definition related to the “when?” question but as soon as we
Gargaud, Muriel, Reisse, Jacques
openaire   +3 more sources

The Arrow of Time

American Journal of Physics, 1962
The time symmetry of the physical laws is discussed. The asymmetry in all statistical processes is found to be related to the tendency for radiation to diverge and that in turn is related to the expansion of the universe. No asymmetry is contained in the laws of electrodynamics, and the choice of the retarded potentials is not a time unsymmetrical step.
openaire   +2 more sources

Arrow of time in cosmology

Physical Review D, 1985
The usual proof of the CPT theorem does not apply to theories which include the gravitational field. Nevertheless, it is shown that CPT invariance still holds in these cases provided that, as has recently been proposed, the quantum state of the Universe is defined by a path integral over metrics that are compact without boundary. The observed asymmetry
openaire   +2 more sources

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