Month: September 2022

2ND SOLUTION. “Perhaps standard effective field theory arguments are right, and vacuum fluctuations really do generate a huge cosmological constant. I show that if one does not assume homogeneity and an arrow of time at the Planck scale, a very large class of general relativistic initial data exhibit expansions, shears, and curvatures that are enormous at small scales, but quickly average to zero macroscopically.” https://lnkd.in/exjYNciU View in LinkedIn

1ST SOLUTION. “The approach developed in [1] implies that, at the ultra-fast and microscopic (Planck) scales, the “true” magnitude of the cosmological constant is very large, and its magnitude is defined by the vacuum energy density predicted by quantum mechanics, which is about 120 orders of magnitude larger than the value experimentally observed at cosmological scales.” https://www.mdpi.com/2218-1997/7/6/164/htm View in LinkedIn

ISSUE OF SCALE. “However, the effect of this huge “true” cosmological constant at macroscopic scales is largely canceled by strong metric fluctuations on the Planck scale. As a result, the effective cosmological constant observed at macroscopic cosmological scales equals its currently measured value of Λ = 1.11 × 10(−52) m(−2).” https://www.mdpi.com/2218-1997/7/6/164/htm View in LinkedIn

FAST SCALE. “Cosmological solutions exhibiting fast scale factor oscillations also appear quite generically in many other theoretical frameworks, such as semiclassical quantum gravity, cosmological models with oscillating dark energy, and various modified gravity theories.” https://www.mdpi.com/2218-1997/7/6/164/htm View in LinkedIn

ANALOGY. “It should be noted that the role of the universe scale factor a(t) is somewhat similar to the role of the center of mass coordinate, which describes the motion of some complicated macroscopic object. In classical mechanics, this motion is well-defined.” https://www.mdpi.com/2218-1997/7/6/164/htm View in LinkedIn

BRAIN PRECURSORS, “The neurotrophin signaling pathway plays a role in neural development, regeneration and neural plasticity in mammals. Analyzing the Daphnia genome, Wilson shows for the first time that a neurotrophin and both a tyrosine receptor kinase (Trk) and a p75-type neurotrophin-receptor (p75NTR) are present in a protostome, indicating that this pathway existed in the last common ancestor of protostomes and deuterostomes.” https://lnkd.in/eb_zYf4p View in LinkedIn

“Light at the purple end of the spectrum has more energy than light at the red end. Hy do you think that purple is not a very common plant color?”" " https://lnkd.in/emQTE2Ha. View in LinkedIn

FRAGMENT FROM NATURE is a Mind warp, touching the extraordinary world of condensed matter physics, higher dimensions, and broken symmetry in time. The ideas explored, including quite magical mathematics, are straight out of Alice in Wonderland. There are, it seems, few limits to creative thinking. https://lnkd.in/e5UXiem5 View in LinkedIn

AUTHORS: Distinguished Professor Peter Hannaford, Optical Sciences Centre, Swinburne University of Technology, Australia; and Professor Krzysztof Sacha, institute of Theoretical Physics, Jagiellonian University, Poland. https://lnkd.in/e5UXiem5 View in LinkedIn

DEFINITION. “Time crystals are physical systems whose time translation symmetry is spontaneously broken.” https://lnkd.in/e5jENMEg View in LinkedIn