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Propellantless space propulsion from a gravitational effect sourced by energy fluctuations
José J. A. Rodal, Ph.D.
__________________________________________________________
1. 9 confusions in the literature
2. Correct formulation
3. Exact solution results
4. Conclusions
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Tajmar, M., 2017, “Mach Effect Thruster Model,” Acta Astronautica, 141, pp. 8-16
Discrepancy between models and experiments
Rodal 10/2017
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…the total non-dimensional coupling factor for the Mach
effect force … is of the order of (10-2)3 = 10-6. The reason for
the need of this coupling factor …remains to be fully
explored.
Discrepancy between models and experiments
Rodal 10/2017
Rodal, J., 2016, “Mach Effect Propulsion, an Exact Electroelasticity Solution,”
Estes Park Advanced Propulsion Workshop
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9 confusions in the literature
__________________________________________________________
Rodal 10/2017
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Confusion in the literature
__________________________________________________________
1. Confusing the local potential f (~0) with
the total universe’s potential F (~ c2)
Rodal 10/2017
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Calculating the universe’s potential F Sciama: a solid ball of radius R, uniform density
F = U/m = - G ∫ (r /r ) dV
V=(4p/3) r3
F = - G ∫ (r /r ) 4p r2 dr
integrate between r=0 and r=R:
= - 2p G r R2
replace M= r V = r (4p/3) R3
F = - (3/2) G M/ R
Sciama then drops factor of 2p saying “it is approximate” and just calculates f = - 0.24 G M/ R
Davidson calculates Scharwzschild radius formula
r
Rodal 10/2017
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Inside a solid ball of radius R, uniform density
1) Potential energy proportional to r2
F = U/m = - G M (3 R2 – r2)/(2 R3)
at center r = 0, F = - (3/2) G M/ R
(like Sciama,
but there is no center and no edge!)
at periphery r = R, F = - G M/ R
2) Gravitational acceleration proportional to distance from center (like a
spring):
a = F/m = dF/dr = G M r / R3
at center r = 0, a(r=0) = 0 (but there is no center and no edge!)
at periphery r = R, a(r=R) = G M / R2
for universe = a(r=R) = 5.14x10-12 g ~ 0
r
Rodal 10/2017
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Calculating the universe’s potential F Newton’s (hollow) shell theorem
1) Constant potential energy
U = - G M m/ R
everywhere inside the shell
with radius R. Constant
potential
F = U/m = - G M/ R
2) Zero gravitational force
everywhere inside the shell:
a = F/m = dF/dr = 0
Closer:
less
mass
Farther:
more
mass
Rodal 10/2017
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(David E. Rowe, from “The Relativity Explosion,” 1976, Author:M. Gardner, Illustrator: A. Ravielli)
Mach’s origin of inertia
“mass-energy there rules inertia here.” Ciufolini and Wheeler (1995) (p. 399)
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The universe as a hologram (Susskind,etc.)
Rodal 10/2017
A. Kamajian & J. Bekenstein Sci. Am. Jan 2006
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fg/c2 ≠ -1 actually fg/c
2 ~ 0
Tajmar, M, 2017, “Mach Effect Thruster Model,”Acta Astronautica, 141, pp. 8-16
No
Rodal 10/2017
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Sciama, L., 1953, “On the Origin of Inertia,” MNRAS, 113, 1, pp. 34-42
Sciama clearly distinguished between the local potential f (~0) and the
total universe’s potential F (~ c2), and used different notation for them
Rodal 10/2017
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Mega drive f/c2 ~ 0
Universe - F/c2 ~ 0.5
Rodal 10/2017
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Best estimate: -F/c2 ~ 0.4 (similar to black hole -f/c2 ~ 0.5 )
including dark matter -F/c2 ~ 2.4
f/c2 ~ 0
Rodal 10/2017
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Confusion in the literature
__________________________________________________________
2. Where is the Woodward effect?
Rodal 10/2017
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Williams, L., 2016, “A Conventional, Post-Newtonian Mach Effect,” Estes workshop
No !
?
…
Where is the Woodward effect ?
Rodal 10/2017
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Notation should have differentiated between F/c2 ~ - 1, and f ~ 0
Woodward, J., 2004, “Flux Capacitors,” Foundations of Physics, 34, 10, pp. 1475-1514
Not here!
These terms are the
Woodward effect !
Rodal 10/2017
Where is the Woodward effect ?
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why not
here?
Rodal 10/2017
Where is the Woodward effect ?
•Woodward considered wave effect with
D’Alembertian instead of just static Laplacian
∇2f
• For r = 0 (no mass source) Einstein’s
equations have vacuum solutions (Ricci flat
but not Riemann flat)
• Vacuum solutions are Non-Machian: e.g.
anti-Machian Ozsváth–Schücking metric :
stationary, singularity-free, not isometric with
Minkowski metric
• Energy fluctuations in spacetime without
any mass source
= 0
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Confusion in the literature
__________________________________________________________
3. Cannot have a 1-D model for Mach propulsion!
Rodal 10/2017
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Cannot have a 1-D model for Mach propulsion
• Cannot have a clamped boundary condition in space
• Cannot push or pull something with internal forces
(electrostriction, piezoelectricity, etc.) Violation of
conservation of momentum!
• A 1-D fluctuating mass will not accelerate in any direction Rodal 10/2017
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Confusion in the literature
__________________________________________________________
4. Can’t have changes in mass due to energy
fluctuations, without damping
Rodal 10/2017
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Simple Harmonic Motion: no fluctuation in total energy!
Rodal 10/2017
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Energy-mass fluctuation is only
possible with damping
g = 2 z w0= c/m > 0
Energy in the (under) damped oscillator: total energy fluctuation only for damping > 0
Alexei Gilchrist
Rodal 10/2017
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Confusion in the literature
__________________________________________________________
5. Models that ignore damping cannot realistically
predict frequency w dependence
Rodal 10/2017
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Confusion in the literature
•MEGA drive operates at resonance. Amplitude at
resonance is governed by damping
(No damping = INFINITE amplitude)
Rodal 10/2017
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Confusion in the literature
• unphysical to predict w6 or w4 dependence when
ignoring damping at resonance:
•heat generation is a function of frequency
•higher frequency modes are more heavily
damped
Rodal 10/2017
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Confusion in the literature
__________________________________________________________
6. Mass fluctuation predictions that are incompatible
with physical experimental data
Rodal 10/2017
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Tajmar, M, 2017, “Mach Effect Thruster Model,” Acta Astronautica, 141, pp. 8-16
Mass fluctuation has to be compatible with existing
dynamic physical data
Rodal 10/2017
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Confusion in the literature
__________________________________________________________
7. Mechanical-energy is not the only type of energy
that gravitates or that has a gravitational potential
Rodal 10/2017
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In general relativity all types of energy-momentum
gravitate!
Stress energy, kinetic energy, electromagnetic
energy, thermal energy, etc., they all gravitate, they
all have a potential.
Rodal 10/2017
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E=mc2 The total energy E is conserved
Mechanical stress energy is not privileged in Mach’s
principle!
Rodal 10/2017
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Confusion in the literature
__________________________________________________________
8. “m” term in Hoyle-Narlikar is not a local mass
source!
Rodal 10/2017
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Fearn et.al., 2015, “Theory of a Mach Effect Thruster II,” JMP
The mass is here in Tab !
Not here: m is not a mass
Rodal 10/2017 not
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Fearn et.al., 2015, “Theory of a Mach Effect Thruster II,” JMP
The mass is here in Tab
m is not a
mass
•Hoyle-Narlikar’s smooth-field ~ Brans-Dicke’s
• m is a scalar field pervading all of spacetime
and its associated particle has zero mass
• m is only due to the inverse square root of G
m = c2 /√ [(4 p /3) G] ~ c2 / (2√G)
• mplanck = √ [h c / G]
Rodal 10/2017
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“I would very strongly doubt that [the Hoyle-Narlikar particle field equations]
have any [mathematical] solutions. Maybe the [Hoyle-Narlikar] theory
should be taken seriously only after you have gone to the fluid average.”
Jürgen Ehlers *
• The fluid average version of Hoyle-Narlikar (HN) is a conformal scalar-
tensor gravitation theory, similar to Jordan-Brans-Dicke’s theory (JBD)
• Jordan-Brans-Dicke’s theory is much more studied, with several exact
solutions (unlike HN), and is derivable from Kaluza-Klein cosmology (after
compactification, etc.)
• A gravitational scalar field as in JBD is an
unavoidable feature of superstring, supergravity and
M-theory (string dilaton, etc.)
• Coupling constant (w) in JBD, need one in HN too
* p.272,“Mach’s Principle,” Barbour & Pfister, ed., 1995 Rodal 10/2017
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Brans-Dicke scalar field goes like 1/G
fBD = (2w+4) c4 / [G (2w+3)]
Cassini–Huygens (C. Will 2014) shows coupling parameter w > 43,000
hence fBD = c4 /G
~ 4 m2
Jordan-Brans-Dicke’s scalar-tensor theory
Rodal 10/2017
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Uncertainty on scalar coupling in interstellar space
•Experimental bounds on BD coupling w are from experiments
(Cassini–Huygens, etc.) in our solar system that may not apply in
interstellar space because of the chameleon effect (Khoury et.al.)
•Chameleon effect depends on the background energy density of
the environment
•Nagata, Chiba, Sugiyama (PRD 2004): WMAP temperature power
spectrum constraints 10<w<107 [small coupling]
•Hrycyna, Szydlowski, Kamionka (PRD 2014): distant supernovae type Ia,
and Hubble function H(z) measurements (using Bayesian
methods), find -2.38<w<-0.86 [large coupling] in correspondence
with low-energy limit of string theory w = -1. MACH EFFECT
LARGER IN INTERSTELLAR SPACE
Jordan-Brans-Dicke’s scalar-tensor theory
Rodal 10/2017
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9 confusions in the literature
__________________________________________________________
9. Dissonance: repeating Wheeler’s “mass-energy
there rules inertia here”
Rodal 10/2017
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“mass-energy there rules inertia here.” Ciufolini and Wheeler (1995) (p. 399)
F = - G Mu/ Ru
Mass Mu=1053 kg= 100000000000000000000000000000000000000000000000000000 kg
“there”
rules inertia
here But you are only fluctuating the tiny
mass m = 0.2 kg here!
Rodal 10/2017
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Correct formulation
__________________________________________________________
1.Can one find the Woodward effect terms in
Einstein’s General Relativity?
Rodal 10/2017
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Rodal, 2017, “A Machian wave effect in conformal, scalar-tensor gravitational theory”
Woodward effect terms in Einstein’s General Relativity?
Rodal 10/2017
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Rodal, 2017, “A Machian wave effect in conformal, scalar-tensor gravitational theory”
Woodward effect terms in Einstein’s General Relativity?
•The term in GR is 3 PN: infinitesimal, because
the prefactor is the potential f due to the local
mass instead of the entire universe’s potential
F
• GR gauge dependence: coordinate
dependence.
• physical meaning is tied to a metric solution to
the entire universe. GR admits anti-Machian
solutions (Gödel, Ozsváth–Schücking) as well
as Machian solutions (Friedman-Robertson-
Walker).
Rodal 10/2017
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Using the Bianchi
identities… more
promising but more
complex…
Rodal, 2017, “A Machian wave effect in conformal, scalar-tensor gravitational theory”
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Correct formulation
__________________________________________________________
2. Scalar-tensor theories
Jordan
Brans
Dicke
Hoyle
Narlikar
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Rodal, 2017, “A Machian wave effect in conformal, scalar-tensor gravitational theory”
Invariant form
(gauge
independent)
of
HN equations
valid for arbitrarily
large gravitational
field:
all nonlinear
scalar terms
disappear
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Rodal, 2017, “A Machian wave effect in conformal, scalar-tensor gravitational theory” Rodal 10/2017
Conformal transformation:
dilational invariance
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Rodal, 2017, “A Machian wave effect in conformal, scalar-tensor gravitational theory”
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Rodal, 2017, “A Machian wave effect in conformal, scalar-tensor gravitational theory”
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Rodal, 2017, “A Machian wave effect in conformal, scalar-tensor gravitational theory”
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Rodal, 2017, “A Machian wave effect in conformal, scalar-tensor gravitational theory”
Rodal 10/2017
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Correct formulation
__________________________________________________________
3. The correct terms can be obtained from Sciama
using simple differentiation!
Rodal 10/2017
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Sciama, L., 1953, “On the Origin of Inertia,” MNRAS, 113, 1, pp. 34-42
Sciama clearly distinguished between the local potential f (~0) and the
total universe’s potential F (~ - c2), and used different notation for them
Rodal 10/2017
Sciama
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Correctly calculate
the 2nd time
derivative of the
total potential
Woodward/Fearn
experiments can
only fluctuate local
mass ml
Rodal, 2017, “A Machian wave effect in conformal, scalar-tensor gravitational theory”
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Correctly calculate
the 2nd time
derivative of the
total potential
The solution for the
interior region is
similar. There is
no singularity at
the center of a
uniform mass
body.
Rodal, 2017, “A Machian wave effect in conformal, scalar-tensor gravitational theory”
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Correctly calculate
the 2nd time
derivative of the
total potential
The solution at the
center of the mass
ball differs only by a
factor of 3/2 from the
one at the surface.
There is no
singularity at the
center for a uniform
mass body. The
local mass
potential is
infinitesimally small
everywhere inside
the MEGA drive. Rodal, 2017, “A Machian wave effect in conformal, scalar-tensor gravitational theory”
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f/c2 ~ 10-27 F/c2 ~ - 0.5
Scalar-tensor theories
(Hoyle Narlikar,
Jordan-Brans-Dicke,
string theory (dilaton),
etc.) term related to G
fluctuation
Infinitesimal term
related to local mass
fluctuation present in
General Relativity (3PN)
(and Machian metric for
the universe)
Rodal 10/2017
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“mass-energy there rules inertia here.” Ciufolini and Wheeler (1995) (p. 399)
F = - G Mu/ Ru
Mass Mu=1053 kg= 100000000000000000000000000000000000000000000000000000 kg
“there”
rules inertia
here
But you are only fluctuating the tiny
mass m = 0.2 kg here, not there!
Reason for large discrepancy with experimental results
Rodal 10/2017
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Exact solution results
__________________________________________________________
Rodal 10/2017
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Frequency (Hz)
Fo
rce
(m
N)
Kelvin-Voigt viscoelastic damping
maluminum=7.29 grams
mbrass = 60.00 grams
Q=60
to al. m
ass
to bra
ss m
ass
Rodal 10/2017
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Frequency (Hz)
Fo
rce
(m
N)
Fluid damping
maluminum = 7.29 grams
mbrass = 60.00 grams
Q=60
to al. m
ass
to bra
ss m
ass
Rodal 10/2017
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Rodal 10/2017
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Rodal 10/2017
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Rodal 10/2017
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Rodal 10/2017
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• 9 confusions:
1. Confusing the local potential f (~0) with the total universe’s potential
F (~ c2)
2. is not the Woodward effect
3. No valid 1-D model of Mach effect space propulsion
4. Can’t have total energy fluctuation without damping
5. No sense in predicting frequency dependence when
damping is neglected
Summary & conclusions
Rodal 10/2017
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Summary & conclusions
• 9 confusions:
6. Magnitude of mass fluctuation has to be compatible with existing dynamic
physical data
7. All energies gravitate: mechanical-energy is not the only energy with a
gravitational potential
8. “m” in Hoyle-Narlikar is not a
local mass source! It is a scalar
field permeating all of spacetime
9. “mass-energy there Mu=1053 kg
rules inertia here” … but you are
only fluctuating the tiny mass
m = 0.2 kg here
Rodal 10/2017
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Summary & conclusions
•Correct formulation:
f/c2 ~ 10-27 F/c2 ~ - 0.5
Scalar-tensor theories
(Hoyle Narlikar,
Jordan-Brans-Dicke,
string theory (dilaton),
etc.) term related to G
fluctuation
Infinitesimal term
related to local mass
fluctuation present in
General Relativity (3PN)
(and Machian metric for
the universe)
Rodal 10/2017
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Summary & conclusions
•Exact solution:
•partial differential equation for a continuous stack (infinite
number of degrees of freedom): all eigenfrequencies and
eigenmodes
• solution is very sensitive to
•damping mechanism
• mass distribution
•good agreement with scant data for: equal masses, and for
brass= 65, 81, 97, 113 and 128 g. Need detailed tests
particularly at lower brass mass for further verification.
Rodal 10/2017
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Rodal 10/2017
Propellantless space propulsion from a gravitational effect sourced by energy fluctuations
José J. A. Rodal, Ph.D.
__________________________________________________________
Thank you for watching!