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GIVEN ASSUMPTIONS. “Although a fully‐satisfactory quantum description of black holes is still missing, it is reasonably clear that they represent the states in a Hilbert space of quantized fields. We shall not question this statement.” https://onlinelibrary.wiley.com/doi/full/10.1002/prop.201800007?casa_token=GdPRXs_tGLEAAAAA%3Ag-pxPMtkcleTYDUNK3mYGfpEzKRyc2LqQknTgFFB7dkYFDL8rDe2s0f4_0Q0oKjXD4_AEgFPGWolVTQ View in LinkedIn

FRAGMENT FROM NATURE features an extraordinary article by an extraordinary man. Professor J. Butterfied was Regius Professor of Physic at the University of Cambridge where he led the re-establishment of the School of Clinical Medicine, at the University of Cambridge, and was Master of Downing College, Cambridge. I had a long meeting with this man and was stunned by his extreme gentle humility and his effortless gravitas. https://lnkd.in/dTSsKks View in LinkedIn

INEVITABLE QUESTION. “Let us first ask, what are the black holes from the quantum field theoretic point of view?” https://onlinelibrary.wiley.com/doi/full/10.1002/prop.201800007?casa_token=GdPRXs_tGLEAAAAA%3Ag-pxPMtkcleTYDUNK3mYGfpEzKRyc2LqQknTgFFB7dkYFDL8rDe2s0f4_0Q0oKjXD4_AEgFPGWolVTQ View in LinkedIn

Believe it or not, this little person came up to me in the woods. I am trying to locate its home. Mythical experience. View in LinkedIn

THIS SAYS IT ALL. “Males latch onto the female with their teeth and become 'sexual parasites,' eventually coalescing with the female until nothing is left of their form but their testes for reproduction. (Angler fish, as reproductive Cheshire cat). https://lnkd.in/dGJVpfH View in LinkedIn

THE END OF SPACE AND TIME. “These characterize physical regimes at which quantum gravity effects are expected to be important, and—perhaps—where the continuum picture of space and time breaks down. Like the Planck length, their values are such that they are empirically inaccessible except in the very early universe. For example, the Planck time LT is about 10(-42) seconds, and the Planck energy is 10(19) GeV.” https://lnkd.in/dMm_YkR View in LinkedIn

PLANCK UNITS. “The value of the Planck length is around 10(-33) cm, which is truly miniscule: the diameters of an atom, nucleus, proton and quark are, respectively, about 10(-8), 10(-12), 10(-13), and 10(-16) cm. So the Planck length is as many orders of magnitude from the (upper limit for) the diameter of a quark, as that diameter is from our familiar scale of a centimetre! The same point can also be made in regard to the other so-called ‘Planck scales’: the Planck time, the Planck energy, and the Planck temperature.” https://lnkd.in/dMm_YkR View in LinkedIn

SMALLEST LENGTH. “Quantum gravity effects should be important at about a length-scale called the ‘Planck length’.” https://lnkd.in/dMm_YkR View in LinkedIn

VICTIM OF ITS OWN SUCCESS. “It should be admitted from the outset, that the subject of quantum gravity is exceptionally difficult and problematic, both in regard to mathematical and to conceptual issues. Furthermore, these problems are compounded by the almost complete lack of any unequivocal data to guide attempts to construct such a theory. In this sense, twentieth-century physics is a victim of its own success: the empirical success of general relativity and quantum theory in their present forms means that we lack data bearing on how we might reconcile them (or more generally, replace them).” https://lnkd.in/dMm_YkR View in LinkedIn

DERIVATIVES. “Physics abounds with examples of definitional extension, provided that the derived theory is conceived narrowly enough that it does not have properties, explanatory resources etc. that ‘ride free’ of the deriving theory, and so block the derivation.” https://lnkd.in/dMm_YkR View in LinkedIn