Posts Tagged ‘Hawking Black Holes’

Dark Matter Not Caused By Tiny Black Holes

May 25, 2019

Big, yet simple ideas is what propels physics. Always has, always will.

27 per cent of the matter in the Universe is made up of Dark Matter. Its gravitational force prevents stars in our Milky Way from flying apart.

Some proposed that DM doesn’t exist, the 1/dd law of gravitation doesn’t work (MOND theories), General Relativity is thus false, etc… I don’t believe in MOND. One reason that I don’t believe in MOND is that my own Sub Quantum theory, SQPR, predicts Dark Matter.

Attempts to detect Dark Matter particles using underground experiments, or accelerator experiments including the world’s largest accelerator, the Large Hadron Collider, have failed so far.

That leaves me smirking, as my own SQPR doesn’t use particles….

Watch the entire Andromeda, and detect flickering…

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The failure of the DM particle search has led some to consider Hawking’s 1974 theory of the existence of primordial black holes, born shortly after the Big Bang, and his speculation that they could make up a large fraction of the elusive Dark Matter.

An international team of researchers, led by Kavli Institute for the Physics and Mathematics of the Universe Principal Investigator Masahiro Takada, PhD candidate student Hiroko Niikura, Professor Naoki Yasuda, and including researchers from Japan, India and the US, have used gravitational lensing to look for primordial black holes between Earth and the Andromeda galaxy. Gravitational lensing is what happens when gravitation bends of light rays coming from a distant object such as a star due to the gravitational effect of an intervening massive object such as a primordial black hole. It is a prediction of Newton’s theory of light as particles, and is multiplied by a factor of two from the slowing down of local time next to a mass such as the Sun (Einstein’s prediction thereof).

In extreme cases, such light bending causes the background star to appear much brighter than it originally is.

Figure 2: As the Subaru Telescope on Earth looks at the Andromeda galaxy, a star in Andromeda will become significantly brighter if a primordial black hole passes in front of the star. As the primordial black hole continues to move out of alignment, the star will also turn dimmer (go back to its original brightness). Credit: Kavli IPMU

Gravitational lensing effects due to primordial black holes, if they existed, would be very rare events because it requires a star in the Andromeda galaxy, a primordial black hole acting as the gravitational lens, and an observer on Earth to be exactly in line with one another.

The one event which looked like a small Black Hole detection…

To maximize the chances of capturing an event, the researchers used the Hyper Suprime-Cam on the Subaru Telescope, which can capture the whole image of the Andromeda galaxy in one shot. Taking into account how fast primordial black holes are expected to move in interstellar space, the team took multiple images to be able to catch the flicker of a star as it brightens for a period of a few minutes to hours due to gravitational lensing.

Figure 3: Data from the star which showed characteristics of being magnified by a potential gravitational lens, possibly by a primordial black hole. About 4 hours after data taking on the Subaru Telescope began, one star began to shine brighter. Less than an hour later, the star reached peak brightness before becoming dimmer. Credit: Niikura et al.

From 190 consecutive images of the Andromeda galaxy taken over seven hours during one clear night, the team scoured the data for potential gravitational lensing events. If Dark Matter consists of primordial black holes of a given mass, in this case masses lighter than the moon, the researchers expected to find about 1000 events. But after careful analyses, they could only identify one case. The team’s results showed primordial black holes can contribute no more than 0.1 per cent of all Dark Matter mass. Therefore, it is unlikely that Hawking’s proposal is helps to solve the Dark Matter problem.

The more plausible conventional theories fail, the more SQPR looks good. I believe in SQPR, because it’s so simple, and in line with the sort of physics Buridan, Newton and Laplace approved of. It also makes sense of Quantum Mechanics by introducing the notion of Quantum Interaction, and then giving it a finite speed.[1]

Patrice Ayme

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[1] Kepler is the first I know of who mention the planets been held to the sun by a force (1/d). Boulliau, aka Bullialdus, corrected that into 1/dd, by analogy with light. Newton was baffled by the absurdity of it all, but Laplace introduced the simple trick of making gravity go at a finite speed… and predicted black holes! Then Lorentz and Poincaré introduced local time. Anyway the SQPR interaction duplicates Kepler’s work, in a sense. Then DM becomes a prediction a bit similar to Laplace’s gravitational waves… (That is, energy consideration… with observable consequences. Then waves, for Laplace, now DM, with SQPR…)