Imaginary Geometry and the Gaussian Free Field
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1 Imaginary Geometry and the Gaussian Free Field Jason Miller and Scott Sheffield Massachusetts Institute of Technology May 23, 2013 Jason Miller and Scott Sheffield (MIT) Imaginary Geometry and the Gaussian Free Field May 23, / 30
2 Part I: SLE Jason Miller and Scott Sheffield (MIT) Imaginary Geometry and the Gaussian Free Field May 23, / 30
3 SLE κ Random, fractal curve in D C simply connected Introduced by Oded Schramm as a candidate for the scaling limit of loop erased random walk and the interfaces in critical percolation. (Percolation simulations due to Sam Watson) Jason Miller and Scott Sheffield (MIT) Imaginary Geometry and the Gaussian Free Field May 23, / 30
4 SLE κ Random, fractal curve in D C simply connected Introduced by Oded Schramm as a candidate for the scaling limit of loop erased random walk and the interfaces in critical percolation. (Percolation simulations due to Sam Watson) Jason Miller and Scott Sheffield (MIT) Imaginary Geometry and the Gaussian Free Field May 23, / 30
5 SLE κ Random, fractal curve in D C simply connected Introduced by Oded Schramm as a candidate for the scaling limit of loop erased random walk and the interfaces in critical percolation. (Percolation simulations due to Sam Watson) Jason Miller and Scott Sheffield (MIT) Imaginary Geometry and the Gaussian Free Field May 23, / 30
6 SLE κ η(s) η(t) g t g t (η(s)) Loewner s equation: if η is a non self-crossing path in H with η(0) R and g t is the Riemann map from the unbounded component of H \ η([0, t]) to H normalized by g t(z) = z + o(1) as z, then tg t(z) = 2 g t(z) W t where g 0(z) = z and W t = g t(η(t)). ( ) Jason Miller and Scott Sheffield (MIT) Imaginary Geometry and the Gaussian Free Field May 23, / 30
7 SLE κ η(s) η(t) g t g t (η(s)) Loewner s equation: if η is a non self-crossing path in H with η(0) R and g t is the Riemann map from the unbounded component of H \ η([0, t]) to H normalized by g t(z) = z + o(1) as z, then tg t(z) = 2 g t(z) W t where g 0(z) = z and W t = g t(η(t)). ( ) SLE κ in H: The random curve associated with ( ) with W t = κb t, B a standard Brownian motion. Jason Miller and Scott Sheffield (MIT) Imaginary Geometry and the Gaussian Free Field May 23, / 30
8 SLE κ η(s) η(t) g t g t (η(s)) Loewner s equation: if η is a non self-crossing path in H with η(0) R and g t is the Riemann map from the unbounded component of H \ η([0, t]) to H normalized by g t(z) = z + o(1) as z, then tg t(z) = 2 g t(z) W t where g 0(z) = z and W t = g t(η(t)). ( ) SLE κ in H: The random curve associated with ( ) with W t = κb t, B a standard Brownian motion. Other domains: apply conformal mapping. Jason Miller and Scott Sheffield (MIT) Imaginary Geometry and the Gaussian Free Field May 23, / 30
9 SLE κ SLE κ is a continuous path (κ 8, Rohde-Schramm κ = 8, Lawler, Schramm, Werner), Dimension: 1 + κ 8 (Beffara), Simple if κ (0, 4], self-touching if κ > 4, space-filling if κ 8. (Simulations due to Tom Kennedy) Jason Miller and Scott Sheffield (MIT) Imaginary Geometry and the Gaussian Free Field May 23, / 30
10 Sample path properties of the SLE trace Continuity; Hölder exponent Dimensions Multi-fractal spectra Natural parameterization Duality (path decompositions) CLE (loop version of SLE) SLE on multiply connected domains Reversibility Jason Miller and Scott Sheffield (MIT) Imaginary Geometry and the Gaussian Free Field May 23, / 30
11 Reversibility of SLE κ An SLE κ process η from x to y. Question: If we run η in the reverse direction (i.e., from y to x), is it still an SLE κ? Jason Miller and Scott Sheffield (MIT) Imaginary Geometry and the Gaussian Free Field May 23, / 30
12 Reversibility of SLE κ An SLE κ process η from x to y. Question: If we run η in the reverse direction (i.e., from y to x), is it still an SLE κ? Answer: Yes for κ 8. x y Jason Miller and Scott Sheffield (MIT) Imaginary Geometry and the Gaussian Free Field May 23, / 30
13 A related question An SLE κ process η from x to y. Question: If we observe the range of η, can we determine the path? Jason Miller and Scott Sheffield (MIT) Imaginary Geometry and the Gaussian Free Field May 23, / 30
14 A related question An SLE κ process η from x to y. Question: If we observe the range of η, can we determine the path? Answer: No for κ > 4. x y Jason Miller and Scott Sheffield (MIT) Imaginary Geometry and the Gaussian Free Field May 23, / 30
15 Part II: SLE and the Gaussian Free Field Jason Miller and Scott Sheffield (MIT) Imaginary Geometry and the Gaussian Free Field May 23, / 30
16 Rays of a Smooth Function h smooth [h(x, y) = x 2 + y 2 ] Jason Miller and Scott Sheffield (MIT) Imaginary Geometry and the Gaussian Free Field May 23, / 30
17 Rays of a Smooth Function h smooth [h(x, y) = x 2 + y 2 ] Vector field e ih(x,y) Jason Miller and Scott Sheffield (MIT) Imaginary Geometry and the Gaussian Free Field May 23, / 30
18 Rays of a Smooth Function h smooth [h(x, y) = x 2 + y 2 ] Vector field e ih(x,y) A ray of h is a flow line of e ih, i.e. a solution to d η(t) = eih(η(t)) dt Jason Miller and Scott Sheffield (MIT) Imaginary Geometry and the Gaussian Free Field May 23, / 30
19 Rays of a Smooth Function h smooth [h(x, y) = x 2 + y 2 ] Vector field e ih(x,y) A θ-angle ray of h is a flow line of e i(h+θ), i.e. a solution to d η(t) = ei(h(η(t))+θ) dt Jason Miller and Scott Sheffield (MIT) Imaginary Geometry and the Gaussian Free Field May 23, / 30
20 Rays of a Smooth Function h smooth [h(x, y) = x 2 + y 2 ] Vector field e ih(x,y) A θ-angle ray of h is a flow line of e i(h+θ), i.e. a solution to d η(t) = ei(h(η(t))+θ) dt The rays of h vary smoothly and monotonically with θ and are non-intersecting Jason Miller and Scott Sheffield (MIT) Imaginary Geometry and the Gaussian Free Field May 23, / 30
21 Rays of a Smooth Function h smooth [h(x, y) = x 2 + y 2 ] Vector field e ih(x,y) A θ-angle ray of h is a flow line of e i(h+θ), i.e. a solution to d η(t) = ei(h(η(t))+θ) dt The rays of h vary smoothly and monotonically with θ and are non-intersecting. Plan: Describe the interaction of the rays of the GFF Explain how this can be used to study SLE Jason Miller and Scott Sheffield (MIT) Imaginary Geometry and the Gaussian Free Field May 23, / 30
22 The Gaussian Free Field I The discrete Gaussian free field (DGFF) is a Gaussian random surface model. Jason Miller and Scott Sheffield (MIT) Imaginary Geometry and the Gaussian Free Field May 23, / 30
23 The Gaussian Free Field I The discrete Gaussian free field (DGFF) is a Gaussian random surface model. I Gaussian measure on functions h : D R for D Z2 and h D = ψ where I I Covariance: Green s function for discrete Mean Height: discrete harmonic ext. of ψ Jason Miller and Scott Sheffield (MIT) Imaginary Geometry and the Gaussian Free Field May 23, / 30
24 The Gaussian Free Field I The discrete Gaussian free field (DGFF) is a Gaussian random surface model. I Gaussian measure on functions h : D R for D Z2 and h D = ψ where I I I Covariance: Green s function for discrete Mean Height: discrete harmonic ext. of ψ Density with respect to Lebesgue measure on R D :! 1 1X 2 exp (h(x) h(y )) Z 2 x y Jason Miller and Scott Sheffield (MIT) Imaginary Geometry and the Gaussian Free Field May 23, / 30
25 The Gaussian Free Field I The discrete Gaussian free field (DGFF) is a Gaussian random surface model. I Gaussian measure on functions h : D R for D Z2 and h D = ψ where I I Covariance: Green s function for discrete Mean Height: discrete harmonic ext. of ψ I Density with respect to Lebesgue measure on R D :! 1 1X 2 exp (h(x) h(y )) Z 2 x y I Fine mesh limit: converges to the continuum GFF, i.e. the standard Gaussian wrt the Dirichlet inner product Z 1 (f, g ) = f (x) g (x)dx. 2π Jason Miller and Scott Sheffield (MIT) Imaginary Geometry and the Gaussian Free Field May 23, / 30
26 Properties of the GFF Conformal invariance D, D C domains, ϕ: D D conformal transformation. If h is a GFF on D then h ϕ 1 is a GFF on D. ϕ D D Jason Miller and Scott Sheffield (MIT) Imaginary Geometry and the Gaussian Free Field May 23, / 30
27 Properties of the GFF Conformal invariance D, D C domains, ϕ: D D conformal transformation. If h is a GFF on D then h ϕ 1 is a GFF on D. ϕ D D Markov property D C domain, h a GFF on D. D Jason Miller and Scott Sheffield (MIT) Imaginary Geometry and the Gaussian Free Field May 23, / 30
28 Properties of the GFF Conformal invariance D, D C domains, ϕ: D D conformal transformation. If h is a GFF on D then h ϕ 1 is a GFF on D. ϕ D D Markov property D C domain, h a GFF on D. Fix S D. Conditional law of h D\S given h S is a GFF on D \ S plus the harmonic extension of h (D\S) to D \ S. S D Jason Miller and Scott Sheffield (MIT) Imaginary Geometry and the Gaussian Free Field May 23, / 30
29 Constructing the rays of the GFF Suppose h is smooth on H and η is a ray of h with η(0) = 0, i.e. d η(t) = eih(η(t)) dt η Jason Miller and Scott Sheffield (MIT) Imaginary Geometry and the Gaussian Free Field May 23, / 30
30 Constructing the rays of the GFF Suppose h is smooth on H and η is a ray of h with η(0) = 0, i.e. η determines the values of h along η and η is independent of the values of h off of η d η(t) = eih(η(t)) dt η Jason Miller and Scott Sheffield (MIT) Imaginary Geometry and the Gaussian Free Field May 23, / 30
31 Constructing the rays of the GFF Sample a (simple) SLE κ process η in H from 0 to (i.e. κ (0, 4)) η Jason Miller and Scott Sheffield (MIT) Imaginary Geometry and the Gaussian Free Field May 23, / 30
32 Constructing the rays of the GFF Sample a (simple) SLE κ process η in H from 0 to (i.e. κ (0, 4)) Given η, let h be a GFF on H \ η with boundary data on η given by what it would be if η were a flow line of e ih/χ where χ = 2 κ κ 2 η Jason Miller and Scott Sheffield (MIT) Imaginary Geometry and the Gaussian Free Field May 23, / 30
33 Constructing the rays of the GFF Sample a (simple) SLE κ process η in H from 0 to (i.e. κ (0, 4)) Given η, let h be a GFF on H \ η with boundary data on η given by what it would be if η were a flow line of e ih/χ where χ = 2 κ κ 2 Theorem (Sheffield) The marginal law of h is that of a GFF on all of H η Jason Miller and Scott Sheffield (MIT) Imaginary Geometry and the Gaussian Free Field May 23, / 30
34 Constructing the rays of the GFF Sample a (simple) SLE κ process η in H from 0 to (i.e. κ (0, 4)) Given η, let h be a GFF on H \ η with boundary data on η given by what it would be if η were a flow line of e ih/χ where χ = 2 κ κ 2 Theorem (Sheffield) The marginal law of h is that of a GFF on all of H Theorem (Dubédat) η is almost surely determined by h η Jason Miller and Scott Sheffield (MIT) Imaginary Geometry and the Gaussian Free Field May 23, / 30
35 Multiple rays of the GFF A random closed set S coupled with a GFF h on a domain D is said to be local for h if the conditional law of h D\S given S is that of the sum of a zero-boundary GFF on D \ S and an independent harmonic function. S D Jason Miller and Scott Sheffield (MIT) Imaginary Geometry and the Gaussian Free Field May 23, / 30
36 Multiple rays of the GFF A random closed set S coupled with a GFF h on a domain D is said to be local for h if the conditional law of h D\S given S is that of the sum of a zero-boundary GFF on D \ S and an independent harmonic function. S D Examples Deterministic closed sets. An SLE path coupled with h as a flow line drawn up to a stopping time. Jason Miller and Scott Sheffield (MIT) Imaginary Geometry and the Gaussian Free Field May 23, / 30
37 Multiple rays of the GFF A random closed set S coupled with a GFF h on a domain D is said to be local for h if the conditional law of h D\S given S is that of the sum of a zero-boundary GFF on D \ S and an independent harmonic function. A 1 A 2 D Examples Deterministic closed sets. An SLE path coupled with h as a flow line drawn up to a stopping time. Fact (Schramm, Sheffield) If A 1, A 2 are local sets for a GFF h which are conditionally independent given h, then A 1 A 2 is a local set for h. Jason Miller and Scott Sheffield (MIT) Imaginary Geometry and the Gaussian Free Field May 23, / 30
38 Multiple rays of the GFF A random closed set S coupled with a GFF h on a domain D is said to be local for h if the conditional law of h D\S given S is that of the sum of a zero-boundary GFF on D \ S and an independent harmonic function. A 1 A 2 D Examples Deterministic closed sets. An SLE path coupled with h as a flow line drawn up to a stopping time. Fact (Schramm, Sheffield) If A 1, A 2 are local sets for a GFF h which are conditionally independent given h, then A 1 A 2 is a local set for h. Moreover, the boundary behavior for the conditional law of h given A 1 A 2 agrees with that of h given A 1 near points points z A 1 with dist(z, A 2) > 0 and vice-versa. Jason Miller and Scott Sheffield (MIT) Imaginary Geometry and the Gaussian Free Field May 23, / 30
39 Multiple rays of the GFF A random closed set S coupled with a GFF h on a domain D is said to be local for h if the conditional law of h D\S given S is that of the sum of a zero-boundary GFF on D \ S and an independent harmonic function. A 1 A 2 D Examples Deterministic closed sets. An SLE path coupled with h as a flow line drawn up to a stopping time. Fact (Schramm, Sheffield) If A 1, A 2 are local sets for a GFF h which are conditionally independent given h, then A 1 A 2 is a local set for h. Moreover, the boundary behavior for the conditional law of h given A 1 A 2 agrees with that of h given A 1 near points points z A 1 with dist(z, A 2) > 0 and vice-versa. Leads to couplings with many SLE paths. Intersection points of paths cause trouble. Jason Miller and Scott Sheffield (MIT) Imaginary Geometry and the Gaussian Free Field May 23, / 30
40 Rays of e ih/χ, h GFF, χ [κ = 1/256] Angle π 2 Angle π 2 Jason Miller and Scott Sheffield (MIT) Imaginary Geometry and the Gaussian Free Field May 23, / 30
41 Rays of e ih/χ, h GFF, χ [κ = 1/32] Angle π 2 Angle π 2 Jason Miller and Scott Sheffield (MIT) Imaginary Geometry and the Gaussian Free Field May 23, / 30
42 Rays of e ih/χ, h GFF, χ 7.88 [κ = 1/16] Angle π 2 Angle π 2 Jason Miller and Scott Sheffield (MIT) Imaginary Geometry and the Gaussian Free Field May 23, / 30
43 Rays of e ih/χ, h GFF, χ = 3.75 [κ = 1/4] Angle π 2 Angle π 2 Jason Miller and Scott Sheffield (MIT) Imaginary Geometry and the Gaussian Free Field May 23, / 30
44 Rays of e ih/χ, h GFF, χ 2.47 [κ = 1/2] Angle π 2 Angle π 2 Jason Miller and Scott Sheffield (MIT) Imaginary Geometry and the Gaussian Free Field May 23, / 30
45 Rays of e ih/χ, h GFF, χ = 1.5 [κ = 1] Angle π 2 Angle π 2 Jason Miller and Scott Sheffield (MIT) Imaginary Geometry and the Gaussian Free Field May 23, / 30
46 Rays of e ih/χ, h GFF, χ 1.02 [κ = 3/2] Angle π 2 Angle π 2 Jason Miller and Scott Sheffield (MIT) Imaginary Geometry and the Gaussian Free Field May 23, / 30
47 Rays of e ih/χ, h GFF, χ = 0.71 [κ = 2] Angle π 2 Angle π 2 Jason Miller and Scott Sheffield (MIT) Imaginary Geometry and the Gaussian Free Field May 23, / 30
48 Rays of e ih/χ starting from an interior point Jason Miller and Scott Sheffield (MIT) Imaginary Geometry and the Gaussian Free Field May 23, / 30
49 Rays of e i h/χ, h = h + β log, h GFF, β < 0 Jason Miller and Scott Sheffield (MIT) Imaginary Geometry and the Gaussian Free Field May 23, / 30
50 Rays of e ih/χ, h GFF, χ 2.47 [κ = 1/2] Jason Miller and Scott Sheffield (MIT) Imaginary Geometry and the Gaussian Free Field May 23, / 30
51 Rays of e ih/χ, h GFF, χ 2.47 [κ = 1/2] Jason Miller and Scott Sheffield (MIT) Imaginary Geometry and the Gaussian Free Field May 23, / 30
52 Rays of e ih/χ, h GFF, χ 2.47 [κ = 1/2] Jason Miller and Scott Sheffield (MIT) Imaginary Geometry and the Gaussian Free Field May 23, / 30
53 Rays of e ih/χ, h GFF, χ 2.47 [κ = 1/2] Jason Miller and Scott Sheffield (MIT) Imaginary Geometry and the Gaussian Free Field May 23, / 30
54 Background Existence and uniqueness of couplings (η, h) of a GFF h and η SLE κ are studied in the works of Sheffield, Schramm-Sheffield, Dubédat, and Izyurov-Kytöla New Contributions: Developed a robust theory of flow line interaction to make the phenomena observed in the simulations precise General forms of SLE duality the SLE light cone SLE κ(ρ) processes are continuous (even when they hit the boundary) Important variant of SLEκ The drift for the driving function includes a linear combination of the Loewner evolution of a collection force points Double and cut point dimension of SLE Reversibility results Jason Miller and Scott Sheffield (MIT) Imaginary Geometry and the Gaussian Free Field May 23, / 30
55 Flow line interaction θ 1>θ 2 η θ1 η θ2 x 1 x 2 h GFF on H, x 1, x 2 H with x 1 x 2. η θ1, η θ2 flow line of h with angles θ 1, θ 2 starting from x 1, x 2 Jason Miller and Scott Sheffield (MIT) Imaginary Geometry and the Gaussian Free Field May 23, / 30
56 Flow line interaction θ 1>θ 2 η θ1 η θ2 x 1 x 2 h GFF on H, x 1, x 2 H with x 1 x 2. η θ1, η θ2 flow line of h with angles θ 1, θ 2 starting from x 1, x 2 Theorem (M., Sheffield) If θ1 > θ 2, then η θ1 stays to the left of η θ2 Jason Miller and Scott Sheffield (MIT) Imaginary Geometry and the Gaussian Free Field May 23, / 30
57 Flow line interaction θ 1>θ 2 θ 1=θ 2 η θ1 η θ2 η θ1 η θ2 x 1 x 2 x 1 x 2 h GFF on H, x 1, x 2 H with x 1 x 2. η θ1, η θ2 flow line of h with angles θ 1, θ 2 starting from x 1, x 2 Theorem (M., Sheffield) If θ1 > θ 2, then η θ1 stays to the left of η θ2 If θ1 = θ 2, then η θ1 merges with η θ2 upon intersecting Jason Miller and Scott Sheffield (MIT) Imaginary Geometry and the Gaussian Free Field May 23, / 30
58 Flow line interaction θ 1>θ 2 θ 1=θ 2 θ 1<θ 2 η θ1 η θ2 η θ1 η θ2 η θ1 η θ2 x 1 x 2 x 1 x 2 x 1 x 2 h GFF on H, x 1, x 2 H with x 1 x 2. η θ1, η θ2 flow line of h with angles θ 1, θ 2 starting from x 1, x 2 Theorem (M., Sheffield) If θ1 > θ 2, then η θ1 stays to the left of η θ2 If θ1 = θ 2, then η θ1 merges with η θ2 upon intersecting If θ1 < θ 2, then η θ1 crosses η θ2 upon intersecting Jason Miller and Scott Sheffield (MIT) Imaginary Geometry and the Gaussian Free Field May 23, / 30
59 Flow line interaction θ 1>θ 2 θ 1=θ 2 θ 1<θ 2 η θ1 η θ2 η θ1 η θ2 η θ1 η θ2 x 1 x 2 x 1 x 2 x 1 x 2 h GFF on H, x 1, x 2 H with x 1 x 2. η θ1, η θ2 flow line of h with angles θ 1, θ 2 starting from x 1, x 2 Theorem (M., Sheffield) If θ1 > θ 2, then η θ1 stays to the left of η θ2 If θ1 = θ 2, then η θ1 merges with η θ2 upon intersecting If θ1 < θ 2, then η θ1 crosses η θ2 upon intersecting In each case, the conditional law of η θ1 given η θ2 is an SLE κ(ρ) process Jason Miller and Scott Sheffield (MIT) Imaginary Geometry and the Gaussian Free Field May 23, / 30
60 SLE κ (ρ) η(s) η(t) g t g t (η(s)) 0 W t Loewner ODE tg t(z) = 2 g t(z) W t where g 0(z) = z. SLE κ: W t = κb t where B is a standard Brownian motion Jason Miller and Scott Sheffield (MIT) Imaginary Geometry and the Gaussian Free Field May 23, / 30
61 SLE κ (ρ) η(s) η(t) g t g t (η(s)) 0 v ρ W t V t ρ Loewner ODE tg t(z) = 2 g t(z) W t where g 0(z) = z. SLE κ: W t = κb t where B is a standard Brownian motion SLE κ(ρ): Force point v > 0 and a weight ρ R. dw t = κdb t + ρ 2 dt where dv t = dt, V 0 = v. W t V t V t W t Jason Miller and Scott Sheffield (MIT) Imaginary Geometry and the Gaussian Free Field May 23, / 30
62 Continuity SLE κ (ρ) SLE κ is continuous (κ 8: Rohde-Schramm, κ = 8: Lawler-Schramm-Werner) Jason Miller and Scott Sheffield (MIT) Imaginary Geometry and the Gaussian Free Field May 23, / 30
63 Continuity SLE κ (ρ) SLE κ is continuous (κ 8: Rohde-Schramm, κ = 8: Lawler-Schramm-Werner) Theorem (M., Sheffield) SLE κ(ρ) processes are continuous. Jason Miller and Scott Sheffield (MIT) Imaginary Geometry and the Gaussian Free Field May 23, / 30
64 Continuity SLE κ (ρ) SLE κ is continuous (κ 8: Rohde-Schramm, κ = 8: Lawler-Schramm-Werner) Theorem (M., Sheffield) SLE κ(ρ) processes are continuous. Proof: (for SLE κ(ρ 1; ρ 2) for κ (0, 4)) Let η θ be the flow line with angle θ and fix θ 1 > 0 > θ 2. Fact: η θ1, η θ2, η 0 are continuous if they do not hit the boundary. Reason: Their law is mutually absolutely continuous with respect to SLE κ. The law of η 0 given η θ1 and η θ2 is an SLE κ(ρ 1; ρ 2) process. Jason Miller and Scott Sheffield (MIT) Imaginary Geometry and the Gaussian Free Field May 23, / 30
65 SLE Duality Fix κ (0, 4). The outer boundary of an SLE 16/κ process is described by a certain SLE κ process. Predicted by Duplantier Jason Miller and Scott Sheffield (MIT) Imaginary Geometry and the Gaussian Free Field May 23, / 30
66 SLE Duality Fix κ (0, 4). The outer boundary of an SLE 16/κ process is described by a certain SLE κ process. Predicted by Duplantier Natural for certain values of κ, i.e. κ = 2 (LERW) and 16/κ = 8 (UST) Jason Miller and Scott Sheffield (MIT) Imaginary Geometry and the Gaussian Free Field May 23, / 30
67 SLE Duality Fix κ (0, 4). The outer boundary of an SLE 16/κ process is described by a certain SLE κ process. Predicted by Duplantier Natural for certain values of κ, i.e. κ = 2 (LERW) and 16/κ = 8 (UST) Proved in various forms by Zhan and Dubédat Jason Miller and Scott Sheffield (MIT) Imaginary Geometry and the Gaussian Free Field May 23, / 30
68 Duality in the GFF: the SLE Light Cone Flow lines with fixed angle π 2 and π 2. Jason Miller and Scott Sheffield (MIT) Imaginary Geometry and the Gaussian Free Field May 23, / 30
69 Duality in the GFF: the SLE Light Cone Flow lines with angle π 2 and π ; one direction change. 2 Jason Miller and Scott Sheffield (MIT) Imaginary Geometry and the Gaussian Free Field May 23, / 30
70 Duality in the GFF: the SLE Light Cone Flow lines with angle π 2 and π ; two direction changes. 2 Jason Miller and Scott Sheffield (MIT) Imaginary Geometry and the Gaussian Free Field May 23, / 30
71 Duality in the GFF: the SLE Light Cone Flow lines with angle π 2 and π ; three direction changes. 2 Jason Miller and Scott Sheffield (MIT) Imaginary Geometry and the Gaussian Free Field May 23, / 30
72 Duality in the GFF: the SLE Light Cone Flow lines with angle π 2 and π ; four direction changes. 2 Jason Miller and Scott Sheffield (MIT) Imaginary Geometry and the Gaussian Free Field May 23, / 30
73 Duality in the GFF: the SLE Light Cone Theorem (M., Sheffield): The set of all points accessible by SLE κ flow lines (κ (0, 4)) with angles restricted in [ π 2, π 2 ] is an SLE 16/κ process. Jason Miller and Scott Sheffield (MIT) Imaginary Geometry and the Gaussian Free Field May 23, / 30
74 SLE 128 Light Cone Jason Miller and Scott Sheffield (MIT) Imaginary Geometry and the Gaussian Free Field May 23, / 30
75 Dimensions Flow lines with angle π 2 and π 2 Jason Miller and Scott Sheffield (MIT) Imaginary Geometry and the Gaussian Free Field May 23, / 30
76 Dimensions Flow lines with angle π 2 and π 2 SLE κ for κ = 16/κ Jason Miller and Scott Sheffield (MIT) Imaginary Geometry and the Gaussian Free Field May 23, / 30
77 Dimensions Theorem (M., Wu) The cut point dimension of SLE κ for κ (4, 8) is 3 3κ 8 Flow lines with angle π 2 and π 2 SLE κ for κ = 16/κ Jason Miller and Scott Sheffield (MIT) Imaginary Geometry and the Gaussian Free Field May 23, / 30
78 Dimensions Theorem (M., Wu) The cut point dimension of SLE κ for κ (4, 8) is 3 3κ 8 Corollary of a result which gives the dimension of the intersection of flow lines with different angles. Flow lines with angle π 2 and π 2 SLE κ for κ = 16/κ Jason Miller and Scott Sheffield (MIT) Imaginary Geometry and the Gaussian Free Field May 23, / 30
79 Dimensions Theorem (M., Wu) The cut point dimension of SLE κ for κ (4, 8) is 3 3κ 8 Corollary of a result which gives the dimension of the intersection of flow lines with different angles. Also gives the double point dimension is 2 (12 κ )(4 + κ )/(8κ ). Flow lines with angle π 2 and π 2 SLE κ for κ = 16/κ Jason Miller and Scott Sheffield (MIT) Imaginary Geometry and the Gaussian Free Field May 23, / 30
80 Reversibility of SLE κ for κ 8 The time-reversal of an SLE κ is not an SLE κ for κ > 8 (Rohde-Schramm). Jason Miller and Scott Sheffield (MIT) Imaginary Geometry and the Gaussian Free Field May 23, / 30
81 Reversibility of SLE κ for κ 8 Theorem (M., Sheffield) SLE κ( κ 2; κ 2) is reversible for κ Jason Miller and Scott Sheffield (MIT) Imaginary Geometry and the Gaussian Free Field May 23, / 30
82 Reversibility of SLE κ for κ 8 Theorem (M., Sheffield) SLE κ( κ 2; κ 2) is reversible for κ 8. The time-reversal 4 4 of ordinary SLE κ is an SLE κ( κ 4; κ 4). 2 2 Jason Miller and Scott Sheffield (MIT) Imaginary Geometry and the Gaussian Free Field May 23, / 30
83 The SLE κ fan is reversible Jason Miller and Scott Sheffield (MIT) Imaginary Geometry and the Gaussian Free Field May 23, / 30
84 Jason Miller and Scott Sheffield (MIT) Imaginary Geometry and the Gaussian Free Field May 23, / 30
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