4,009 research outputs found
Galaxy rotations from quantised inertia and visible matter only
It is shown here that a model for inertial mass, called quantised inertia, or
MiHsC (Modified inertia by a Hubble-scale Casimir effect) predicts the
rotational acceleration of the 153 good quality galaxies in the SPARC dataset
(2016 AJ 152 157), with a large range of scales and mass, from just their
visible baryonic matter, the speed of light and the co-moving diameter of the
observable universe. No dark matter is needed. The performance of quantised
inertia is comparable to that of MoND, yet it needs no adjustable parameter. As
a further critical test, quantised inertia uniquely predicts a specific
increase in the galaxy rotation anomaly at higher redshifts. This test is now
becoming possible and new data shows that galaxy rotational accelerations do
increase with redshift in the predicted manner, at least up to Z=2.2.Comment: 9 pages, 2 figures. Published in Astrophys Space Sc
Can the Podkletnov effect be explained by quantised inertia?
The Podkletnov effect is an unexplained loss of weight of between 0.05% and
0.07% detected in test masses suspended above supercooled levitating
superconducting discs exposed to AC magnetic fields. A larger weight loss of up
to 0.5% was seen over a disc spun at 5000 rpm. The effect has so far been
observed in only one laboratory. Here, a new model for inertia that assumes
that inertial mass is caused by Unruh radiation which is subject to a
Hubble-scale Casimir effect (called MiHsC or quantised inertia) is applied to
this anomaly. When the disc is exposed to the AC magnetic field it vibrates
(accelerates), and MiHsC then predicts that the inertial mass of the nearby
test mass increases, so that to conserve momentum it must accelerate upwards
against freefall by 0.0029 m/s^2 or 0.03% of g, about half of the weight loss
observed. With disc rotation, MiHsC predicts an additional weight loss, but 28
times smaller than the rotational effect observed. MiHsC suggests that the
effect should increase with disc radius and rotation rate, the AC magnetic
field strength (as observed), and also with increasing latitude and for lighter
discs.Comment: 8 pages, 1 figure. To appear in the SPESIF-2011 conference
proceedings, in Physics Procedi
Inertia from an asymmetric Casimir effect
The property of inertia has never been fully explained. A model for inertia
(MiHsC or quantised inertia) has been suggested that assumes that 1) inertia is
due to Unruh radiation and 2) this radiation is subject to a Hubble-scale
Casimir effect. This model has no adjustable parameters and predicts the cosmic
acceleration, and galaxy rotation without dark matter, suggesting that Unruh
radiation indeed causes inertia, but the exact mechanism by which it does this
has not been specified. The mechanism suggested here is that when an object
accelerates, for example to the right, a dynamical (Rindler) event horizon
forms to its left, reducing the Unruh radiation on that side by a Rindler-scale
Casimir effect whereas the radiation on the other side is only slightly reduced
by a Hubble-scale Casimir effect. This produces an imbalance in the radiation
pressure on the object, and a net force that always opposes acceleration, like
inertia. A formula for inertia is derived, and an experimental test is
suggested.Comment: 7 pages, 1 figure. Accepted by EPL (Europhysics Letters) on the 11th
February, 201
Testing quantised inertia on galactic scales
Galaxies and galaxy clusters have rotational velocities apparently too fast
to allow them to be gravitationally bound by their visible matter. This has
been attributed to the presence of invisible (dark) matter, but so far this has
not been directly detected. Here, it is shown that a new model that modifies
inertial mass by assuming it is caused by Unruh radiation, which is subject to
a Hubble-scale (Theta) Casimir effect predicts the rotational velocity (v) to
be: v^4=2GMc^2/Theta (the Tully-Fisher relation) where G is the gravitational
constant, M is the baryonic mass and c is the speed of light. The model
predicts the outer rotational velocity of dwarf and disk galaxies, and galaxy
clusters, within error bars, without dark matter or adjustable parameters, and
makes a prediction that local accelerations should remain above 2c^2/Theta at a
galaxy's edge.Comment: 7 pages, 1 figure. Accepted for publication in Astrophysics and Space
Science on 27/7/201
The Tajmar effect from quantised inertia
The Tajmar anomaly is an unexplained acceleration observed by gyroscopes
close to, but isolated from, rotating rings cooled to 5K. The observed ratio
between the gyroscope and ring accelerations was 3+/-1.2*10^-8 for clockwise
rotations and about half this size for anticlockwise ones. Here, this anomaly
is predicted using a new model that assumes that the inertial mass of the
gyroscope is caused by Unruh radiation that appears as the ring and the fixed
stars accelerate relative to it, and that this radiation is subject to a
Hubble-scale Casimir effect. The model predicts that the sudden acceleration of
the ring causes a slight increase in the inertial mass of the gyroscope, and,
to conserve momentum the gyroscope must move with the ring with an acceleration
ratio of 2.67+/-0.24*10^-8 for clockwise rotations and 1.34+/-0.12*10^-8 for
anticlockwise ones, in agreement with the observations. The model predicts that
in the southern hemisphere the anomaly should be larger for anticlockwise
rotations instead, and that with a significant reduction of the mass of the
disc, the decay of the effect with vertical distance should become measurable.Comment: 9 pages, 1 figure. Accepted by EPL on the 16th June, 201
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