User blogs
Abstract: Many physical constants related to quantized gravity, e.g., the Planck length, mass, curvature, stressenergy, etc., are nonanalytic in G at G = 0, and thus have expansions in powers of G whose terms are progressively more divergent with increasing order. Since the gravity field’s classical action is inversely proportional to G, the path integral for gravity-field quantum transition amplitudes shows that these depend on G only through the product ħG, and are nonanalytic in G at G = 0 for the same reason that all quantum transition amplitudes are nonanalytic in ħ at ħ = 0, namely their standard oscillatory essential singularity at the classical ‘limit’. Thus perturbation expansions in powers of G of gravity-field transition amplitudes are also progressively more divergent with increasing order, and hence unrenormalizable. While their perturbative treatment is impossible, the exceedingly small value of ħ G makes the semiclassical treatment of these amplitudes extraordinarily accurate, indeed to such an extent that purely classical treatment of the gravity field ought to always be entirely adequate. It should therefore be fruitful to couple classical gravity to other fields which actually need to be quantized: those fields’ ubiquitous, annoying ultraviolet divergences would thereupon undergo drastic self-gravitational red shift, and thus be cut off. http://prespacetime.com/index.php/pst/article/view/95
Ever-present Lambda and the Quantum Potential of Spacetime (by Willard Mittelman): Abstract: An approach to dark energy is presented that combines ideas of causal set theory with a Machian perspective and a treatment of spacetime as a condensate, yielding a “quantum potential of spacetime” Q whose density ρQ acts as an effective Λ that satisfies the uncertainty relation ∆V∆Λ ~ 1 of unimodular relativity. In contrast to the ever-present Λ of causal set theory, ρQ’s value is always non-negative, and the nonlocality of Q ensures that ρQ is spatially homogeneous, in accordance with observation. http://prespacetime.com/index.php/pst/article/view/96
Is the Universe Rotating? (by B. G. Sidharth): Abstract: Numerous observations and studies suggest that the universe has some sort of overall rotation. We consider this matter and provide a new angle. http://prespacetime.com/index.php/pst/article/view/97
Commentary on Cosmology (Jonathan J. Dickau): Abstract: Cosmology is one area where there is no possibility to reproduce all of what we observe in experiments in laboratories on Earth. But what is real is there for all to see, in the depths of space. So what we do observe must be explained! To that end, scientists have woven an elaborate story about how the universe came to be, and why it is the way we observe it today. But our brave authors have not been afraid to ask “what if the story is not exactly as we were told?” http://prespacetime.com/index.php/pst/article/view/100
Do Gravitons from a Prior Universe Survive a LQG ‘Quantum Bounce’? (by Andrew W. Beckwith): Abstract: We ask if a formula for entropy, as given by S ≡E/T with a usual value ascribed to initial entropy S~105 at the onset of inflation allows an order of magnitude resolution of whether there could be a survival of a graviton from a prior to the present universe, during a ‘bounce’ as predicted by Loop Quantum Gravity, using typical Planckian peak temperature values of T~1019GeV. We obtain values consistent with up to 1038 gravitons contributing to an energy value of E~1024 GeV, if we assume a relic energy contribution where each graviton initially exhibits a frequency spike of 1010Hz. The value of E~1024 GeV is picked from looking at the aftermath of what happens if there is a quantum bounce with a peak density value of ρ max imum ~ 2.07·ρplanck [16] in a regime of LQG bounce radii on the order of magnitude of λ~10-35 meters. The author, in making estimates, specifically avoids using S≡[E-µN] by setting the chemical potential µ≡0 at ultra high temperatures – for reasons which are brought up in the conclusion. http://prespacetime.com/index.php/pst/article/view/92
The Sun Is Electrically Charged & the Conundrum of the "Missing Mass" Is Explained (by Bernard R. Bligh): Abstract: A study of the Sun's corona reveals that the velocities of electrons are substantially higher than the velocity of escape and the velocities of protons are well below the velocity of escape. The Solar Wind contains equal proportions of electrons and protons, it follows that there must be a mechanism for ejecting protons from the surface of the Sun and for holding back most of the electrons. It is postulated here that the Sun and all hot stars have a net positive electric charge. If a galaxy as a whole is neutral it follows that there is a net negative charge in the interstellar space in a galaxy. This hypothesis is supported by the fact that electron clouds have been detected near the bulge of the Milky Way. The next step in the reasoning is that there are attractive electrical forces between these stars and the central bulge and that these attractive forces account for the pattern of velocities of stars in orbit in a galaxy (the so-called ‘flat rotation curve’). It follows that there is no need for a hypothetical ‘missing mass’ to provide a gravitational force for this velocity pattern. http://prespacetime.com/index.php/pst/article/view/93
The Nature of Dimensions (by Lawrence B. Crowell, Ray B. Munroe, Jr.): Abstract: An interesting pattern is observed in Clifford Algebra Symmetries, anticipated M-Theory / F-Theory branes, G2 group symmetries, and the Fibonacci and Lucas Number Sequences. This pattern may specify the structure of dimensions, and implies a relationship between Scale Invariance, Supersymmetry and Spin Statistics. http://prespacetime.com/index.php/pst/article/view/94
