Category: Uncategorized

ALL IS FAIR GAME. “It also underlined the improbability of the Standard Model of Cosmology, featuring an extremely brief initial phase of very brutal deceleration, followed by a rather mysterious and very brief repulsive phase of inflation, mostly justified by the need to solve the enigma of the homogeneity of the primordial universe.” https://lnkd.in/daA2SgMy View in LinkedIn

KEY OBSERVATION. “The discovery in 1998 of a mysterious repulsive energy, dubbed Dark Energy, and representing more than two thirds of the energy content of the universe, provided the first massive evidence for repulsive gravity.” https://lnkd.in/daA2SgMy View in LinkedIn

THE HOYLE AND NARLIKAR PROPOSAL. “For Hawking, it clearly meant that the theory was wrong, but today, with the knowledge that negative mass solutions are allowed, and the observation of repulsive gravity, it is fascinating to see that the initial Machian perspective of Einstein could effectively be realized in the Dirac-Milne universe.” https://lnkd.in/daA2SgMy View in LinkedIn

A SYMMETRICAL UNIVERSE. “Hawking had noted that the Machian formulation of general relativity proposed by Hoyle and Narlikar only works if there exists equal amounts of negative mass and positive mass particles in the universe.” https://lnkd.in/daA2SgMy View in LinkedIn

“ISAAC NEWTON was so haunted by that sense of the transcendent that he devoted the latter part of his life to alchemical studies.” https://lnkd.in/dCkkSu3Y View in LinkedIn

PRELIMINARY INSIGHTS. “While Gbar is preparing a precision measurement with antihydrogen ions cooled to a few tens of microkelvin, the ALPHA collaboration, which made the first spectroscopic measurements on antihydrogen, achieved in 2013 the first constraints on antimatter gravity, though still a factor ≈ 65 larger than the sensitivity necessary to test antigravity.” https://lnkd.in/daA2SgMy View in LinkedIn

MUDDLED FINDING. “But helium-3 is a bad probe of the primordial universe since it can be both destroyed and produced after the initial phases of the universe. As a result, it has sparked little enthusiasm from experimentalists, and the measurements, clearly below the prediction of the Dirac-Milne universe, are probably inconclusive since the authors themselves note that (their) “result for 3He is exactly the opposite of what one would expect (...).” https://lnkd.in/daA2SgMy View in LinkedIn

ANTIGRAVITY TEST. “Importantly, a key test of the Dirac-Milne cosmology will soon be realized in the laboratory with cold antihydrogen atoms: the AEgIS, ALPHA-g and Gbar experiments at CERN are expected to provide tests of the antigravity hypothesis.” (2018). https://lnkd.in/daA2SgMy View in LinkedIn

1ST PROBLEM. “Taken at face value, there are two observational problems facing the Dirac-Milne universe. The first problem is related to an overproduction, by nearly a factor 10, of helium-3.” https://lnkd.in/daA2SgMy View in LinkedIn

RECONSIDERATION. “This led us to the study of the properties of the Dirac-Milne universe, a symmetric matter-antimatter universe, where antimatter is endowed with negative mass, an analog of the electron-hole system in a semi-conductor, providing a cosmology impressively concordant with our universe.” https://lnkd.in/daA2SgMy View in LinkedIn