Self-force from equivalent periodic sources
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1 Self-force from equivalent periodic sources Barak Kol Hebrew University, Jerusalem Capra 16 Dublin, July 2013 Based on arxiv:1307.xxxx
2 Self-force from equivalent periodic sources Barak Kol Hebrew University, Jerusalem Capra 16 Dublin, July 2013 Outline Based on arxiv:1307.xxxx Orbits and frequencies Equivalent sources Regularization Discussion
3 Issues
4 Issues Regularization MiSaTaQuWa Mode sum Regularization (Barack & Ori) Detweiler-Whiting decomposition
5 Issues Regularization MiSaTaQuWa Mode sum Regularization (Barack & Ori) Detweiler-Whiting decomposition Computational cost
6 Issues Regularization MiSaTaQuWa Mode sum Regularization (Barack & Ori) Detweiler-Whiting decomposition Computational cost Characterization of conservative sector Hinderer-Flanagan Brinholtz-Hadar-BK
7 Goal
8 Goal Trajectory Parameters (E, l, t 0, 0)
9 Goal Trajectory Parameters (E, l, t 0, 0) Obtain the adiabatic flow in the space of trajectories - first order EMR Osculating orbits
10 Orbits and frequencies
11 Orbits and frequencies Quasi periodic frequency spectrum! mn = m + n r r = 2 P t = P P t
12 Orbits and frequencies Quasi periodic frequency spectrum! mn = m + n r r = 2 P t = P P t Frequency requirement - constructive interference in azimuthal direction
13 A stroboscope
14 A stroboscope Imagine a stroboscope flashing every P mn
15 A stroboscope Imagine a stroboscope flashing every P mn The body traces a curve
16 A stroboscope Imagine a stroboscope flashing every P mn The body traces a curve It is equivalent to folding the trajectory over a periodic time coordinate
17 (m,n) equivalent source
18 (m,n) equivalent source ergodic: time average to ensemble average
19 (m,n) equivalent source ergodic: time average to ensemble average equation 0= (r, )=! mn t(r)+m ( (r))
20 (m,n) equivalent source ergodic: time average to ensemble average equation 0= (r, )=! mn t(r)+m ( (r)) parametric form = m = n + ( ) P 2
21 (m,n) equivalent source ergodic: time average to ensemble average equation 0= (r, )=! mn t(r)+m ( (r)) parametric form = m = n + ( ) P 2 winds (-m) times around phi and n times around r
22 Examples (00) (01) (10) (11) (20) 0 Ω r Ω Φ Ω Φ Ω r 2Ω Φ
23 Zero frequency
24 Zero frequency Is in the conservative sector
25 Zero frequency Is in the conservative sector := h i t = q 2 P t r (dr/d ) (z)
26 Zero frequency Is in the conservative sector := h i t = q 2 P t r (dr/d ) (z) Only (phi 0,t 0 ) drift
27 Zero frequency Is in the conservative sector := h i t = q 2 P t r (dr/d ) (z) Only (phi 0,t 0 ) drift The dissipative part 0 :=
28 Solving the field equations
29 Solving the field equations 4 f 2 t =4
30 Solving the field equations 4 f 2 t =4 Frequency domain - natural here, elliptic equations
31 Solving the field equations 4 f 2 t =4 Frequency domain - natural here, elliptic equations Time domain
32 Regularization
33 Regularization Singular source
34 Regularization Singular source Less singular (1d density) for aperiodic motion and equivalent source
35 Regularization Singular source Less singular (1d density) for aperiodic motion and equivalent source Zero freq. sector: surface charge density
36 Regularization Singular source Less singular (1d density) for aperiodic motion and equivalent source Zero freq. sector: surface charge density In frequency space - similar to electrostatics with singular source
37 Electrostatics
38 = S + R Electrostatics
39 Electrostatics = S + R 4 R := 4 [4 + f 1! 2 ] S
40 Electrostatics = S + R 4 R := 4 [4 + f 1! 2 ] S [4 + f 1! 2 ] R =4 R
41 Electrostatics = S + R 4 R := 4 [4 + f 1! 2 ] S [4 + f 1! 2 ] R =4 R Time domain in Progress - generalizing Hadamard s local construction S log
42 Edge
43 Edge Charge density near r min (or r max ) (x, y, z) = 1/2 p x (z) x 0
44 Edge Charge density near r min (or r max ) (x, y, z) = 1/2 p x (z) x 0 Solution =2 1/2 < p w w = x + iz
45 Outgoing radiation and self-force
46 Outgoing radiation and self-force Outgoing radiation 1 (, ) r e i! r +0 e i! r for r!1
47 Outgoing radiation and self-force Outgoing radiation 1 (, ) r e i! r +0 e i! r for r!1 Self-force throughout trajectory: drift in (E, l, t 0, 0)
48 Method summary
49 Method summary Goal: drift in trajectory parameters
50 Method summary Goal: drift in trajectory parameters Equivalent periodic source
51 Method summary Goal: drift in trajectory parameters Equivalent periodic source Conservative is zero frequency
52 Method summary Goal: drift in trajectory parameters Equivalent periodic source Conservative is zero frequency Regularization
53 Method summary Goal: drift in trajectory parameters Equivalent periodic source Conservative is zero frequency Regularization Self-force computed throughout at once
54 Generalizations
55 Generalizations Electromagnetism and gravity: source, waves
56 Generalizations Electromagnetism and gravity: source, waves Rotating BH (Kerr)
57 Generalizations Electromagnetism and gravity: source, waves Rotating BH (Kerr) Higher EMR orders
58 Range of usefulness
59 Range of usefulness Relativistic - or else hierarchy of scales
60 Range of usefulness Relativistic - or else hierarchy of scales For freq. space: few freq. (low eccen.)
61 Range of usefulness Relativistic - or else hierarchy of scales For freq. space: few freq. (low eccen.) Nearly incommensurate - the rational w. smallest denominator within the freq. ratio range
62 Paths for continuation
63 Paths for continuation Gauge choice
64 Paths for continuation Gauge choice Invitation for collaboration: Numerical evaluation
65 Paths for continuation Gauge choice Invitation for collaboration: Numerical evaluation Time domain regularization - local expansion generalizing Hadamard
66 Paths for continuation Gauge choice Invitation for collaboration: Numerical evaluation Time domain regularization - local expansion generalizing Hadamard Formulate conservative sector of EMR
67 Thank you for your attention!
68 Givat Brenner My home Kibbutz (village) Thank you for your attention!
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