Hodge-deRham Theory Of K-Forms On Carpet Type Fractals

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Hodge-deRham Theory of K-Forms on CarpetType FractalsJason Bello1Mathematics DepartmentUCLALos Angeles, CA 90024jbello01@yahoo.comYiran Li and Robert S. Strichartz2Mathematics Department, Malott HallCornell UniversityIthaca, NY We outline a Hodge-deRham theory of K-forms ( for k 0,1,2) on two fractals: the SierpinskiCarpet(SC) and a new fractal that we call the Magic Carpet(MC), obtained by a construction similarto that of SC modified by sewing up the edges whenever a square is removed. Our method is toapproximate the fractals by a sequence of graphs, use a standard Hodge-deRham theory on eachgraph, and then pass to the limit. While we are not able to prove the existence of the limits, wegive overwhelming experimental evidence of their existence, and we compute approximations tobasic objects of the theory, such as eigenvalues and eigenforms of the Laplacian in each dimension,and harmonic 1-forms dual to generators of 1-dimensional homology cycles. On MC we observe aPoincare type duality between the Laplacian on 0-forms and 2-forms. On the other hand, on SC theLaplacian on 2-forms appears to be an operator with continuous (as opposed to discrete) spectrum.1 Researchsupported by the National Science Foundation through the Research Experiences forUndergraduates Program at Cornell.2 Research supported by the National Science Foundation, grant DMS - 11620452010 Mathematics Subject Classification. Primary: 28A80Keywords and Phrases: Analysis on fractals, Hodge-deRham theory, k-forms, harmonic 1-forms,Sierpinski carpet, magic carpet.1

1IntroductionThere have been several approaches to developing an analogue of the Hodge-deRham theory ofk-forms on the Sierpinski gasket (SG) and other post-critically finite (pcf) fractals ([ACSY], [C],[CGIS1,2], [CS], [GI1, 2, 3], [H], [IRT]). In this paper we extend the approach in [ACSY] to theSierpinski carpet (SC) and a related fractal that we call the magic carpet (MC). These fractals arenot finitely ramified, and this creates technical difficulties in proving that the conjectured theoretical framework is valid. On the other hand, the structure of “2-dimensional” cells intersectingalong “1-dimensional” edges allows for a nontrivial theory of 2-forms. Our results are largelyexperimental, but they lead to a conjectured theory that is more coherent than for SG.The approach in [ACSY] is to approximate the fractal by graphs, define k-forms and the associated d, δ , operators on them, and then pass to the limit. In the case of SC there is a naturalchoice of graphs. Figure 1.1 shows the graphs on levels 0, 1, and 2.Figure 1.1: The graphs approximating SC on levels 0,1, and 2.SC is defined by the self-similar identity:SC [Fj (SC)(1.1)j 1where Fj is the similarity map of contraction ratio 1/3 from the unit square to each of the eightof the nine subsquares (all except the center square) after tic-tac-toe subdivision. We define thesequence of graphsΓm [Fj (Γm 1 )(1.2)j 1with the appropriate identification of vertices in Fj (Γm 1 ) and Fk (Γm 1 ). Note that a hole in SC onlevel m does not become visible on the graph until level m 1, but it will influence the definition(m)of 2-cells. We denote by E0 the vertices of Γm . A 0-form on level m is just a real-valued function(m)(m)(m)(m)(m)(m)f0 (e0 ) defined on e0 E0 . We denote the vector space of 0-forms by Λ0 . The edges E1(m)of Γm exist in opposite orientations e1(m)on E1 satisfying(m)(m)and e1 , and a 1-form (element of Λ1 ) is a function2

(m)(m)(m)(m)f1 ( e1 ) f1 (e1 ).(1.3)By convention we take vertical edges oriented upward and horizontal edges oriented to the right.We denote by E2m the squares in Γm that bound a cell Fω (SC), where ω (ω1 , ., ωm ) is a wordmof length m, ω j 1, 2, ., 8 and Fω Fω1 Fω2 . Fωm . Thus an element em2 of E2 consists of(0)the subgraph of Γm consisting of the four vertices {Fω (e00 ) : e00 E0 }. In particular, there are(1)8 elements of E2 , even thought the central square is a subgraph of the same type. In general(m)#E2 8m , and we will denote squares by the word ω that generates them. A 2-form is defined(m)(m)to be a function f2 (ω) on E2 .The boundary of a square consists of the four edges in counterclockwise orientation. With ourorientation convention the bottom and right edges will have a plus sign and the top and left edges(m)(m)will have minus sign. We build a signum function to do the bookkeeping: if e1 e2 then( 1 top or right(m) (m)sgn(e1 , e2 ) (1.4) 1 bottom or left(m)(m)(m)(m)It is convenient to define sgn(e1 , e2 ) 0 if e1 is not a boundary edge of e2 . Similarly, if(m)(m)e1 is an edge containing the vertex e0 , define((m) 1 e0 is top or right(m) (m)sgn(e0 , e1 ) (1.5)(m) 1 e0 is bottom or left(m)(m)(m)and sgn(e0 , e1 ) 0 if e0condition(m)is not and endpoint of e1 . It is easy to check the consistency(m)(m)(m)(m)sgn(e0 , e1 )sgn(e1 , e2 ) 0 (1.6)(m)(m)e1 E1(m)(m)(m)(m)for any fixed e0 and e2 , since for e0 e2the other -1.We may define the deRham complexthere are only two nonzero summands, one 1 and(m)(m)(m) d0(m) d1(m)0 Λ0 Λ1 Λ2 0(1.7)with the operators(m) (m)(m)d0 f0 (e1 ) (m)(m)(m)(m)sgn(e0 , e1 ) f0 (e0 ) (m)(m)e0 E0(only two nonzero terms) and3(1.8)

(m) (m)(m)d1 f1 (e2 ) (m)(m)(m)(m)sgn(e1 , e2 ) f1 (e1 ) (1.9)(m)(m)e1 E1(only four nonzero terms). The relation(m)(m)d1 d0 0(1.10)is an immediate consequence of (1.6).To describe the δ operators and the dual deRham complex we need to choose inner products(m)(m)(m)(m)(m)(m)on the spaces Λ0 , Λ1 , Λ2 , or what is the same thing, to choose weights on E0 , E1 , E2 .(m)The most direct choice is to weight each square e2(m)µ2 (e2 ) equally, say1,8m(1.11)(m)making µ2 a probability measure on E2 . Note that we might decide to renormalize by multiplyingby a constant, depending on m, when we examine the question of the limiting behavior as m .For the weighting on edges we may imagine that each square passes on a quarter of its weight toeach boundary edge. Some edges bound one square and some bound two squares, so we choose (m) 1if e1 bounds one squarem(m)µ1 (e1 ) 4 18(1.12)(m) ifeboundstwosquares12 8mFor vertices we may again imagine the weight of each square being split evenly among its vertices.Now a vertex may belong to 1, 2, 3, or 4 squares, so(m)µ0 (e0 ) k4 8m(1.13)(m)if e0 lies in k squares.The dual deRham complex(m)(m) δ1(m)(m)(m) δ20 Λ0 Λ1(m) (m)(m) Λ2 0(1.14)(m) is defined abstractly by δ1 d0and δ2 d1where the adjoints are defined in terms ofthe inner products induced by the weights, or concretely as(m) (m) (m)f1 (e0 ) δ1 µ1 (e1 )(m) (m) (m) (m)sgn(e0 , e1 ) f1 (e1 ),µ(e)(m) 0 0(1.15)µ2 (e2 )(m) (m) (m) (m)sgn(e1 , e2 ) f2 (e2 ).(m) µ1 (e1 )(1.16)(m)e1 E1(m) (m) (m)f2 (e1 ) δ2 (m)e2 E24

(m)There are one or two nonzero terms in (1.16) depending on whether e1 bounds one or two squares.In (1.15) there may be 2, 3, or 4 nonzero terms, depending on the number of edges that meet at the(m)vertex e0 . The condition(m)δ1(m) δ2 0(1.17)is the dual of (1.10).We may then define the Laplacian(m) δ1 d0(m) δ2 d1 d0 δ1(m) d1 δ2 0 1 2(m) (m)(m) (m)(m) (m)(1.18)(m) (m)as usual. These are nonnegative self-adjoint operators on the associated L2 spaces, and so have adiscrete nonnegative spectrum. We will be examining the spectrum (and associated eigenfunctions)carefully to try to understand what could be said in the limit as m . Also of particular interest(m)(m) (m)are the harmonic 1-forms H1 , solutions of 1 h1 0. As usual theses can be characterizedby the two equations(m) (m)d1 h1(m) (m) 0δ1 h1 0,(1.19)and can be put into cohomology/homology duality with the homology generating cycles in Γm .The Hodge decomposition(m)Λ1(m) (m)(m)shows that the eigenfunctions of 1(m)(m) (m) 0 , or δ2 f2(m)spectrum of 1(m)f2(m) (m)(m) d0 Λ0 δ2 Λ2 H1(m) (m)with λ 6 0 are either d0 f0(1.20)(m)for f0an eigenfunction of(m)foran eigenfunction of 2 with the same eigenvalue.(m)(m)is just the union of the 0 and 2 spectrum.nature of the adjacency of squares in Γm , with the associatedThus the nonzeroThe irregularvariability of the(m)weights in (1.12) and (1.13), leads to a number of complications in the behavior of 2 . To overcome these complications we have invented the fractal MC, that is obtained from SC by makingidentifications to eliminate boundaries. On the outer boundary of SC we identify the opposite pairsof edges with the same orientation, turning the full square containing SC into a torus. Each timewe delete a small square in the construction of SC we identify the opposite edges of the deletedsquare with the same orientation. We may think of MC as a limit of closed surfaces of genusg 1 (1 8 . 8m 1 ), because each time we delete and “sew up” we add on a handle tothe torus. This surface carries a flat metric with singularities at the corners of each deleted square(all four corners are identified). It is straightforward to see that the limit exists as a metric space.Whether or not the analytic structures (energy, Laplacian, Brownian motion) on SC can be transferred to MC remains to be investigated. Our results give overwhelming evidence that this is thecase.5

We pass from the graphs Γm approximating SC to graphs Γ̃m approximating MC by making thesame identifications of vertices and edges. The graph Γ̃1 is shown in Figure 6e10V4e4V1Figure 1.2: Γ̃1 with 6 vertices labeled v j , 16 edges labeled e j , and 8 squares labeled s j .Each square has exactly 4 neighbors (not necessarily distinct) with each edge separating 2 squares.For example, in Figure 1.2, we see that s2 has neighbors s1 , s3 , and s7 twice, as e2 and e8 bothseparate s2 and s7 . There are two types of vertices, that we call nonsingular and singular. Thenonsingular vertices (all except v5 in Figure 1.2) belong to exactly 4 distinct squares and 4 distinctedges (two incoming and two outgoing according to our orientation choice). For example, v1belongs to squares s1 , s3 , s6 and s8 and has incoming edges e3 and e14 and outgoing edges e1 ande4 . Singular vertices belong to 12 squares (with double counting) and 12 edges (some of whichmay be loops). In Figure 1.2 there is only one singular vertex v5 . It belongs to squares s1 , s3 , s6 ,and s8 counted once and s2 , s4 , s5 , and s7 counted twice. In Figure 1.3 we show a neighborhood ofthis vertex in Γ̃2 , with the incident squares and edges shown.Figure 1.3: A neighborhood in Γ̃2 of vertex v5 from Figure 1.2.The definition of the deRham complex for the graphs Γ̃m approximating MC is exactly thesame as for Γm approximating SC. The difference is in the dual deRham complex, because the11(m)(m)weights are different. We take µ̃2 (e2 ) m as before, but now µ̃1 (e1 ) because every82 8medge bounds two squares. Finally6

1m(m)µ̃0 (e0 ) 83 8m(m)is nonsingular(m)is singularif e0if e0(1.21)(m)because e0 belongs to 4 squares in the first case and 12 squares in the second case. After that thedefinitions are the same using the new weights.Explicitly, we have(m) (m)(m) 2 f2 (e2 ) 2((m)(m)(m)(m)0f2 (e2 ) f2 (e2 )) (1.22)(m)0(m)e2 e2(m)µ̃2 (e2 ). Except for the factor 2 this is(m)µ̃1 (e1 )(m)exactly the graph Laplacian on the 4-regular graph whose vertices are the squares in Ẽ2 and(m)0(m)whose edge relation is e2 e2 if they have an edge in common (double count if there are twoedges in common).(m)The explicit expression for 0 is almost as simple:(exactly 4 terms in the sum), the factor 2 coming from(m) (m)(m) 0 f0 (e0 ) 1 21 6(m)(m)(m)(m)0(m)is nonsingular(m)(m)(m)(m)0(m)is singular( f0 (e0 ) f0 (e0 )) if e0 (m)0(m)e0 e0( f0 (e0 ) f0 (e0 )) if e0 (m)0e0(1.23)(m) e0Note that there are 4 summands in the first case and 12 summands in the second case (some may(m)be zero if there is a loop connecting e0 to itself in the singular case). We expect that the spectraof these two Laplacians will be closely related, aside from the multiplicative factor of 4. We may(m)(m)(m)(m)define Hodge star operators from Λ0 to Λ2 and from Λ2 to Λ0 by(m)(m) f0 (e2 ) 14 (m)(m)f0 (e0 )(1.24)(m)(m)e0 e2and(m)(m) f2 (e0 ) 1 4 (m)(m)f2 (e2 )(m)if e0is nonsingular(m)(m)e2 e01 12 (m) (m)f2 (e2 )if(m)e0(1.25)is singular(m)(m)e2 e0Note that we do not have the inverse relation that is equal to the identity in either order. Nor isit true that the star operators conjugate the two Laplacians. However, they are approximately valid,7

so we can hope that in the appropriate limit there will be a complete duality between 0-forms and2-forms with identical Laplacians. Nothing remotely like this valid for SC.(m) (m) (m)It is also easy to describe explicitly the equations for harmonic 1-forms. The condition d1 h1 (e2 ) (m) (m)0 is simply the condition that the sum of the values h1 (e1 ) over the four edges of the square(m) (m) (m)is zero (with appropriate signs). Similarly the condition δ1 h1 (e0 ) 0 means the sum over(m)the incoming edges equals the sum over the outgoing edges at e0 . Those equations have tworedundancies, since the sums(m) (m)(m)d1 f1 (e2 ) and (m)(m)e2 E2(m) (m) (m) (m)f1 (e0 )δ1are automatically(m)(m)e0 E0(1)zero for any 1-form f1 . Thus in Λ̃1 there is a 4-dimensional space of harmonic 1-forms, andin general the dimension is 2g, which is exactly the rank of the homology group for a surface ofgenus g. It is easy to identify the homology generating cycles as the edges that are identified.The remainder of this paper is organized as follows: In sections 2, 3, 4 we give the results ofour computations on SC for 0-forms, 1-forms, and 2-forms. In section 5 we give the results for0-forms and 2-forms on MC. In section 6 we give the results for 1-forms on MC. We concludewith a discussion in section 7 of all the results and their implications. The website [W] gives muchmore data than we have been able to include in this paper, and also contains all the programs usedto generate the data.8

20-Forms on the Sierpinski CarpetThe 0-forms on SC will simply be continuous functions on SC, and we can restrict them to the(m)vertices of Γm to obtain 0-forms on Γm . The Laplacian 0 is exactly the graph Laplacian of Γmwith weights on vertices and edges given by (1.12) and (1.13). Thus(m) (m) 0 f0 (x) c(x, y)( f (x) f (y))(2.1)y xwith coefficients show in Figure 2.1Figure 2.1: Coefficients in (2.1)The sequence of renormalized Laplacians(m){ rm 0 }(2.2)for r 10.01 converges to the Laplacian on functions ([BB], [KZ], [BBKT] ,[BHS] ,[BKS] ).(m)In Table 2.1 we give the beginning of the spectrum {λ j } for m 2, 3, 4 and the ratios(3)(2)(4)(3)λ j /λ j and λ j /λ j . The results are in close agreement with the computations in [BHS] and[BKS], and suggest the convergence of (2.2).m ultiplicity121121211121211112211112211121111m ultiplicitym 0.010910.011220.01352 (m)0.01571 0 0414Table 2.1: Eigenvalues of 0.10290.1053for m 2, 3, 4 and ratios.

(m)The convergence of (2.2) would imply that lim rm λ jm λ j gives the spectrum of the limit(m)Laplacian 0 on 0-forms on SC. In particular the values {rm λ j } for small values of j (depending on m) would give a reasonable approximation of some lower portion of the spectrumof 0 . To visualize this portion of the spectrum we compute the eigenvalue counting func(m)tion N(t) #{λ j t} #{rm λ j t} and the Weyl ratio W (t) N(t)t α . In Figure we displaythe graphs of the Weyl ratio using the m 1, 2, 3, 4 approximations, with value α determinedfrom the data to get a function that is approximately constant. As explained in [BKS], we expect8α loglog r 0.9026, which is close to the experimentally determined values. This is explained by(m)the phenomenon called miniaturization as described in [BHS]. Every eigenfunction u j(m 1)reappears in miniaturized form uk(m)(m 1)of 0(m 1)(m 1)with the same eigenvalue λk(m)of 0(m) λ j , so in(m)terms of 0 we have rm 1 λk r(rm λ j ). We can in fact see this in Table 2.1. In passingfrom level m to level m 1, the number of eigenvalues is multiplied by 8, so we expect to have8N(rt) 8N(t), and this explains why α loglog r is the predicted power growth factor of N(t). Wealso expect to see an approximate multiplicative periodicity in W (t), namely W (rt) W (t). It isdifficult to observe this in our data, however. We also mention that miniaturization is valid for allk-forms (k 0, 1, 2) on SC and MC. This is most interesting for 0-forms and 2-forms on MC asdiscussed in Section 5.In Figure 2.2 we show graphs of selected eigenfunctions on levels 2, 3, 4. We only displaythose whose eigenspaces have multiplicity one. The convergence is visually evident. To quantify(m)(m 1) 2the rate of convergence we give the values of k f j fjk2 in Table 2.2. Here the L2(m 1)E0(m 1)norm on E0is defined byk f k22 (m 1)µ0 (e0(m 1) 2) f (e0) (2.3)(m 1)(m 1)e0 E0(m 1) 2k2and we normalize the eigenfunctions so that k f j(m)and k f j (m 1)E0k2 1. In Figure 2.5 weshow the graph of the weyl ratio of eigenvalues of the 0 forms on different levels.10

0.20.12000 0.210105 0.140402050 0 21001005020500 00 0Figure 2.2: graph of eigenfunction of 4th eigenvalue on 0 forms of level 2,3 and 0.1 0.05 1 0.210 0.130105 2100302055020100 050100 00 0Figure 2.3: graph of eigenfunction of 5th eigenvalue on 0 forms of level 2,3 and 0.20 0.410420 0.053010550 0 2100302020105050100 00 0Figure 2.4: graph of eigenfunction of 8th eigenvalue on 0 forms of level 2,3 and 411

SC 0 form Weyl ratio on level 1 alpha 0.92SC 0 form Weyl ratio on level 2 alpha .51t1.502SC 0 form Weyl ratio on level 3 alpha 0.9200.51t1.52SC 0 form Weyl ratio on level 4 alpha 0150.020.025tFigure 2.5: graph of eigenfunction of 8th eigenvalue on 0 forms of level 2,3 and 412

# ofeigenvalue145811121316192021Table 2.2:Eigenvaluem .87130.91020.9336(m)values of k f j (m 1)E0Eigenvaluem .10090.10690.1103(m 1) 2k2 , fjEigenvaluem .01020.01090.0112level 3 0.01610.88180.87550.9226level 4 0.00040.00040.00010.0003from level 3 to level 2 and level 4 to level 3 foreigenspaces of multiplicity one13

31-Forms on the Sierpinski Carpet(m)(m)(m)(m)(m)The 1-forms on Γm are functions on the edges of Γm , with f1 ( e1 ) f1 (e1 ) if e1(m)denotes the edge e1 with opposite orientation. If L denotes any oriented path made up of edges,(m)we may integrate f1 over L by summing:Z(m)L(m)In

We outline a Hodge-deRham theory of K-forms ( for k 0,1,2) on two fractals: the Sierpinski Carpet(SC) and a new fractal that we call the Magic Carpet(MC), obtained by a construction similar to that of SC modified by sewing up the edges whenever a square is removed.

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