Dissertation for the degree philosophiae doctor (PhD) at ...
James A. Shifflett Dissertation Presentation For Degree of Doctor of Philosophy in Physics
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Transcript of James A. Shifflett Dissertation Presentation For Degree of Doctor of Philosophy in Physics
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James A. ShifflettDissertation Presentation For Degree of
Doctor of Philosophy in PhysicsWashington University in St. Louis
April 22, 2008Chairperson: Professor Clifford M. Will
Extensions of the Einstein-SchrodingerNon-Symmetric Theory of Gravity
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• Einstein-Maxwell theory• -renormalized Einstein-Schrodinger (LRES) theory - Lagrangian - Field equations• Exact solutions - Electric monopole - Electromagnetic plane-wave• Equations of motion - Lorentz force equation - Einstein-Infeld-Hoffman method• Observational consequences - Pericenter advance - Deflection of light - Time delay of light - Shift in Hydrogen atom energy levels• Application of Newman-Penrose methods - Asymptotically flat 1/r expansion of the field equations• LRES theory for non-Abelian fields• Conclusions
Overview
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• Greek indices , , , etc. always go from 0…3
• Geometrized units: c=G=1
interval) time-(space ),(),,,( 3210 xddtdxdxdxdxdx
Some conventions
• Einstein summation convention: paired indices imply summation
• comma=derivative, [ ]=antisymmetrization, ( )=symmetrization,
3
0
3
0
dxgdxdxgdxds
],[,, 2
AAA
x
A
x
AF
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Einstein-Maxwell theory
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, potential vector
netic electromag
AAAAA
A
3
2
1
0
The fundamental fields of Einstein-Maxwell theory
• The electromagnetic vector potential A is the fundamental field
x
A
x
A
BBEBBE
BBEEEE
F
xyz
xzy
yzx
zyx
00
00
• Electric and magnetic fields (E and B) are defined in terms of A
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The fundamental fields of Einstein-Maxwell theory
• Metric determines distance between points in space-time
g metric
tensor
g00 g01 g02 g03
g01 g11 g12 g13
g02 g12 g22 g23
g03 g13 g23 g33
1 0 0 0
0 -1 0 0
0 0 -1 0
0 0 0 -1
for flat space and
t,x,y, z coordinates
dxgdxds dx1
dx2
• Connection determines how vectors change when moved
3
2
1
0
connection
dxvvv
v vr
v
dxr
2D radial coordinates(x1,x2)=(r,)
generalized Pythagorean theorem (ds)2=(dx1)2+(dx2)2
•
•
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Almost all field theories can be derived from a Lagrangian
L Lagrangian density
function of fields & derivatives,for example electromagneticvector potential A , A/x
0 LA
LA
x
L(A /x )
310 dxdxdx S L
• The field equations are derived from the Euler-Lagrange equations
which minimizes the “action”
• Lagrangian is also necessary for quantization via path integral methods.
• Guarantees field equations are coordinate independent and self consistent
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)det(),,,,,(
2)(1
ggAguFFg
Rgg
M
b
L161
-
161
-L
g metric tensor ,
connection , R ()
x
x
Einstein-Maxwell theory = General Relativity + Electromagnetism
00
0
LL
L
,
eqs. Lagrange-Euler
g
A 0B and
law sFaraday' ,
law sGauss' andlaw sAmpere'
equations sMaxwell'
Lorentz-force equationEinstein equations
A vector potential , F g-1g-1F, F A
x A
x
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Early attempts to unify General Relativity and Electromagnetism
particles. chargedbetween force Lorentz nopredict to shownr theory Schrodinge-Einstein and theory Straus-Einstein - 1953
.))(det(R- Lagrangian simple very a from derived beCan
: ath theory wiStrausEinsteinr theorySchrodingeEinstein - 1947
or , relativity general vacuumicnonsymmetr : theoryStraus-Einstein - 1946
, relativity general vacuum5D :ryKlein theo-Kaluza -1920s
forces. range long twounify thereally t Doesn' : theoryMaxwellEinstein - 1916
b
][][)(
)5(5
)5(
L
NFNFNg
gAgg
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-renormalized Einstein-Schrodinger (LRES) theory
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LRES theory vs. Einstein-Maxwell theory
theory MaxwellEinstein
L -1
16 g g 1 R () 2b
-1
16 gFgg F LM (g ,A ,u ,,), gdet(g )
where
F A, A,
LRES theory allows nonsymmetric N and
, excludes Fgg F term,
and includes an additional cosmological constant z,
L -1
16 N N 1 R () 2b
-1
16 g2z LM (g , A ,u ,,), N det(N )
where the "bare" b -z so that b z matches measurement, and
A
[ ] / 18b , gg N N 1( )
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• Einstein-Schrödinger theory is non-symmetric generalization of vacuum GR
• LRES theory basically includes a z term in the ES theory Lagrangian - gives the same Lorentz force equation as in Einstein-Maxwell theory
• z term might be expected to occur as a 0th order quantization effect - zero-point fluctuations are essential to Standard Model and QED - demonstrated by Casimir force and other effects • = b+z resembles mass/charge/field-strength renormalization in QED - “physical” mass of an electron is sum of “bare” mass and “self energy” - a “physical” is needed to represent dark energy!
• Non-Abelian LRES theory requires –z ≈ b ≈ 1063 cm-2 ~ 1/(Planck length)2
- this is what would be expected if z was caused by zero-point fluctuations
• z term could also result from the minimum of the potential of some additional scalar field in the theory, like the Weinberg-Salam field
• z modification is a new idea, particularly the non-Abelian version
LRES theory is well motivated
g
g
g
g
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The field equations
• Ampere’s law is identical to Einstein-Maxwell theory
• The electromagnetic field tensor f can be defined by
• Other field equations have tiny extra terms
,2/2/1][1biNNfg
jgfg 4)( ,
114)(
113],[
)''()(4
128
)''()(2
bb
bb
fffgffgffTG
ffAf
rays) gamma Hz10 eV,10 (e.g. tmeasuremen to accessible
f| case- worstfor terms usual of 10 are terms Extra 3420
-13 |||,||, ,,, ff
Possible Proca field ghost with M/ 2b ~1/LP , but probably not.
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Exact Solutions
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g
a 0 0 00 1/a 0 00 0 r2 00 0 0 r2sin2
A0 q
r,
where
a 1 2M
r q2
r2
Exact charged black hole solution of Einstein-Maxwell theory
• Called the Reissner-Nordström solution
• Becomes Schwarzschild solution for q=0
• -2M/r term is what causes gravitational force
1000010000100001
g
is scoordinate txyz inspace Flat s.coordinate
spherical in space flatgives 1a Setting
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Exact charged black hole solution of LRES theory
• The charged solution is very close to the Reissner-Nordström solution,
• Extra terms are tiny for worst-case radii accessible to measurement:
| r q M Msun r 10 17cm,q e,M Me
q2/br4 | 10 73 10 61
M/br3 | 10 73 10 67
g b
a 0 0 00 1/ab 0 00 0 r2 00 0 0 r2 sin2
A0 q
r1
M
br3 4q2
5br4 O(b 2)
, b~1063cm 2
where
a 12M
r
q2
r2 1q2
10br4 O(b 2)
, b 1
2q2
br4
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Charged solution of Einstein-Maxwell theory vs. LRES theory
LRESEinstein-Maxwell Event horizon conceals interior(disappears for Q>M as is the case for elementary particles)
r+
r-r+
r-
g11 has 1/ r singularity,
A, F , N , -N , -g , -g g ,
-g N , -g R are all finite
origin is where (surface area)0;instead of r 0 it is at
re q(2 /b )1/ 4 ~ LP ~ 10 33cm
iessingularit have alsofields relevant other all
y,singularit has1/r g 200
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)(uf
• EM plane wave solution is identical to that of Einstein-Maxwell theory
function) arbitrary
(
)(ˆ
)(ˆ
f
ctxfzB
ctxfyE
)(
10000100001001
222 zyfh
hhhh
g
Exact Electromagnetic Plane Wave Solution of LRES theory
ctxu
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Equations of Motion
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Lorentz force equation is identical to that of Einstein-Maxwell theory
• Usual Lorentz force equation results from divergence of Einstein equations
BvqEqdt
pd
+q/r2 -q/r2 +q/r2
B
mgu
x u
u qF u
where u ( ,
v ) (4 - velocity)
• Lorentz force equation in 4D form
• Also includes gravitational “force”; it becomes geodesic equation when q=0
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• Requires no sources (no in the Lagrangian)
• LRES theory and Einstein-Maxwell theory are both non-linear so two stationary charged solutions summed together is not a solution
• EIH method finds approximate two-particle solutions for g, and A
• Motion of the particles agrees with the Lorentz force equation
q/r2 q/r2
Lorentz force also results from Einstein-Infeld-Hoffman (EIH) method
ML
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Observable Consequences
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M1, Q1
M2, Q2
Pericenter Advance
M1 Q1Q2/M2
Kepler’s third law
3
2
ro
periodfrequencyorbital
This ignoresradiation reaction
rMQ
MQ
r
Q
rr
Q
r
M
rM
bo
p
21
12
3
21
211
22
22
21 6
361
2
3
2
Einstein-Maxwell theory LRES theory modification
Comparison to
Einstein-Maxwell theory
extremal charged black hole
Q=M=Msun,r=4M
atomic parameters
Q1=-Q2=e, M=MP, r=a0
fractional difference 10-75 10-85
frequencypericenter
p
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Deflection of Light
photon
M, Q
parameter
impact b
4
2
2
2
8
3
4
34
b
Q
b
Q
b
M
b
Einstein-Maxwell theory
LRES theorymodification
Comparison to
Einstein-Maxwell theory
extremal charged black hole
Q=M=Msun,r=4M
atomic parameters
Q=e, M=MP, r=a0
fractional difference 10-76 10-54
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Time Delay of Light
radio signal
M, Q t=d/c+t
t=0
satellite
parameter
impact b
–(
)–
3
22
2
3ln4
b
Q
b
Q
b
dMt
b
Einstein-Maxwell theory
LRES theorymodification
d
Comparison to
Einstein-Maxwell theory
extremal charged black hole
Q=M=Msun,r=4M
atomic parameters
Q=e, M=MP, r=a0
fractional difference 10-75 10-55
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• may contain all of the Standard Model (excluding FFterm)
Shift in Hydrogen Atom Energy Levels
ML
Charged fluid : LM q
mu A
2
ug u , u (,v )(4 velocity)
L 116
N N 1 R () 2b
1
16 g2z LM(u,,g,A), N det(N )
levelsenergy atom H in 10 of change fractional gives solution Charged-
unchanged is equationDirac -
:QED
49-
A
iq
xDmDDgM
�
,)(
2
1L
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Application of Newman Penrose Methods
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• 1/r expansion shows that: a) LRES theory has no continuous wave Proca solutions like τ≈sin(kr-t)/r b) LRES theory = Einstein-Maxwell theory to O(1/r2) for k= propagation
• 1/r expansion may not necessarily rule out wave-packet Proca solutions. Perhaps a Proca field with M/ħ~1/LP could be a built-in Pauli-Villars field?
Asympotically flat 1/r expansion of the field equations
Assume all fields depend on u t-kr/, not on r or t separately Expand the fields and field equations in a Newman- Penrose frame as
0 0th orderequations
1st orderequations
1
r 2nd order
equations
1
r2
One of the field equations is f 2A[, ] (f 3)b-1 (f ")b
-1. Taking the curl of this gives something similar to the Proca equation ( ; ;
apparently negligible terms)/2b where f[, ]/ 4.
This suggests that Proca waves with mass M/ 2b ~1/LP might exist. If they exist, a rough calculation suggests they might have negative energy.
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Non-Abelian LRES theory
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Non-Abelian LRES theory vs. Einstein-Weinberg-Salam theory
L 1
16 g g 1 R () 2b
1
32 g tr(Fgg F )LM (g ,A ,e ,), g det(g )
where A Ia ibi is composed of 2x2 Hermitian matrix components and
F A, A, i
2LP sinw
[A ,A], [A,B] AB-BA
theory Salam-Weinberg-Einstein
,)(
ˆ
z a includes and , excludes ,componentsmatrix Hermitian
2x2 with and Nic nonsymmetr allowstheory LRES Abelian-Non
FggFtr
L 116
N1/ 4 tr( N 1 R ()) 4b
1
4g1/ 4z LM (g , A ,e ,,), N det(N )
where the "bare" b -z so that b z matches measurement, and
A
[ ] / 18b , g1/ 4g N1/ 4N 1( ), (assume g Ig )
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The non-Abelian field equations
• Ampere’s law is identical to Weinberg-Salam theory
• The electro-weak field tensor f is defined by
• Other field equations have tiny extra terms
,2/2/1][14/14/1biNNfg
(g1/ 4 f ), 2b g1/ 4[ f ,A ]4g1/ 4 j ,
-z b
8LP2 sin2w
~ 1063cm 2 consistent with a z causedby zero - point fluctuations
12/13)(
12/12],[
)''()(4
18
)''()(],[22
bb
bbb
fffgffgfftrTG
ffAAAf
rays) gamma Hz10 eV,10 (e.g. tmeasuremen to accessible
f| case- worstfor terms usual of 10 are terms Extra 3420
-13 |||,||, ,,, ff
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• LL under SU(2) gauge transformation, with 2x2 matrix U
• LL under U(1) gauge transformation, with scalar
• L*=L when A and f are Hermitian
theory Salam- Wienberglike invariance SU(2)U(1) has Lagrangian
A A 1
2b
, ,
2iI[
, ],
R
R
, N N , g g, f f .
A UAU 1
i
2b
U,U 1,
U
U 1 2[
U, ]U 1,
R
U R
U 1, N UNU 1, g UgU
1, f UfU 1.
.*,,,
,,,ˆˆ,ˆˆ***
****
ggggffAA
NNNNRRTTT
TTT
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For the details see
Refereed Publications • “A modification of Einstein-Schrodinger theory that contains both general relativity and electrodynamics”, General Relativity and Gravitation (Online First), Jan. 2008, gr-qc/0801.2307.Additional Archived Papers• “A modification of Einstein-Schrodinger theory which closely approximates Einstein-Weinberg-Salam theory”, Apr. 2008, gr-qc/0804.1962• “Lambda-renormalized Einstein-Schrodinger theory with spin-0 and spin-1/2 sources”, Apr. 2007, gr-qc/0411016.• “Einstein-Schrodinger theory in the presence of zero-point fluctuations”, Apr. 2007, gr-qc/0310124.• “Einstein-Schrodinger theory using Newman-Penrose tetrad formalism”, Jul. 2005, gr-qc/0403052.Other material on http://www.artsci.wustl.edu/~jashiffl/index.html• Check of the electric monopole solution (MAPLE)• Check of the electromagnetic plane-wave solution (MAPLE)• Asymptotically flat Newman-Penrose 1/r expansion (REDUCE)
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Why pursue LRES theory?
• It unifies gravitation and electro-weak theory in a classical sense
• It is vacuum GR generalized to non-symmetric fields and Hermitian matrix components, with a well motivated z modification
• It suggests untried approaches to a complete unified field theory - Higher dimensions, but with LRES theory instead of vacuum GR? - Larger matrices: U(1)xSU(5) instead of U(1)xSU(2)?
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Conclusion: Non-Abelian LRES theory ≈ Einstein-Weinberg-Salam
• Charged solution and Reissner-Nordström sol. have tiny fractional difference: 10-73 for extremal charged black hole; 10-61 for atomic charges/masses/radii.
Standard tests
extremal charged black hole atomic charges/masses/radiipericenter advance 10-75 10-85
deflection of light 10-76 10-54
time delay of light 10-75 10-55
• Other Standard Model fields included like Einstein-Weinberg-Salam theory: - Energy levels of Hydrogen atom have fractional difference of <10-49.
• fractional difference from Einstein-Maxwell result
• Extra terms in the field equations are <10-13 of usual terms.
• Lorentz force equation is identical to that of Einstein-Maxwell theory
• EM plane-wave solution is identical to that of Einstein-Maxwell theory.
Possible Proca field ghost with M/ 2b ~1/LP , but probably not.
.invariance SU(2)U(1) has Lagrangian
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Backup charts
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The non-Abelian/non-symmetric Ricci tensor
• We use one of many non-symmetric generalizations of the Ricci tensor
• Because it has special transformation properties
• For Abelian fields the third and fourth terms are the same
.relativity generalordinary in occurs as 0, and 0 for tensor Ricciordinary the to Reduces ],[][
ˆˆ
R
,
(( ), )
1
2
( )
1
2
( )
1
3
[ ]
[ ]
R
(
T) R
T (
) (transposition symmetric)
R
(U
U 1 2[
U, ]U 1) U R
(
)U 1 (almost SU(2) invariant)
R
(
2iI[
, ]) R
(
) (U(1) invariant)
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Proca waves as Pauli-Villars ghosts?
• For the Standard Model this difference is about 60
• Non-Abelian LRES theory works for dd matrices as well as 22 matrices
• Maybe 4πsin2w/ or its “bare” value at c works out correctly for some “d”
• SU(5) almost unifies Standard Model, how about U(1)xSU(5)?
• If wave-packet Proca waves exist and if they have negative energy, perhaps the Proca field functions as a built-in Pauli-Villars ghost
c cutofffrequency
Pr oca 2b , -z b
8LP
2 sin2w
z c
4LP2
2 fermionspin states boson
spin states
fermionspin states boson
spin states4 sin2w
412.82
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Electron Self Energy mass renormalizationm = mb- mb·ln(ћωc/mc2)3/2
Photon Self Energy (vacuum polarization) charge renormalizatione = eb - eb·ln(M/m)/3
Zero-Point Energy (vacuum energy density) cosmological constant renormalization = b - LP
2c4(fermions-bosons)/2
c= (cutoff frequency) LP = (Planck length) M= (Pauli-Villars cutoff mass) = (fine structure constant)
e-
e+
e-
e-
e-
= b+ z is similar to mass/charge renormalization in QED