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Fractional complex transform method for wave equations on Cantor sets within local fractional differential operator
Advances in Difference Equations volume 2013, Article number: 97 (2013)
This paper points out the fractional complex transform method for wave equations on Cantor sets within the local differential fractional operators. The proposed method is efficient to handle differential equations on Cantor sets.
In recent years, the local fractional calculus has attracted a lot of interest for scientists and engineers. Several sections of local fractional derivative had been introduced, i.e. the local fractional derivative structured by Kolwankar and Gangal [1–5], the modified Riemann-Liouville derivative given by Jumarie [3–7], the fractal derivative suggested by Parvate and Gangal [3–5, 8, 9], the fractal derivative considered by Chen et al. [3–5, 10–12], the generalized fractal derivative proposed Chen et al. , the local fractional derivative presented by Adda and Cresson [3–5, 13], the fractal derivative suggested by He [3–5, 14–16] and the local fractional derivative structured in [3–5, 17–25]. As a result, the local fractional calculus theory become important for modelling problems for fractal mathematics and engineering on Cantor sets and it plays a key role in many applications in several fields such as the theorical physics [2, 3], the heat conduction theory [3, 14, 17], the fracture and elasticity mechanics [3, 19], the fluid mechanics [3, 26], signal analysis [4, 5], Fourier and wavelet analysis [4, 5], tensor analysis , complex analysis [4, 5], optimization method  and so on. For example, the local fractional Fokker-Planck equation was proposed in . The fractal heat conduction problems were presented [3, 14]. The principles of virtual work, minimum potential and complementary energy in the mechanics of fractal media were investigated in [3, 19, 25]. The fluid flow in fractal porous medium was studied in . The diffusion problems in fractal media was reported in [11, 24, 27]. Authors of  were concerned with one-dimension wave equation on Cantor sets, which read
However, it has not been extended to two-dimensional (2-D) and three-dimensional (3-D) wave equations on Cantor sets due to the structural behavior of complexity of Cantor materials.
Fractional complex transform method via the modified Riemann-Liouville derivative [3–7] was first proposed in 2010 [29–31] and was applied to model the heat conduction problem and differential equations [15, 32–34]. The fractional complex transform met some problems in applications when the modified Riemann-Liouville derivative [3–7] was adopted due to the complex chain rule . Fractional complex transform [17, 35]via the local fractional derivative was first proposed by the following chain rule [3–5]
where there exist and . The heat conduction problem in fractal media was processed by the fractional complex transform within local fractional derivative . The similar results, but using different operators, can be seen in [36–38].
The 2-D wave equation on Cantor sets can easily been obtained
Our attention is focused on convert the 3-D wave equation on Cantor sets by using the fractional complex transform method via local fractional derivatives.
The organization of this manuscript is given below: In Section 2, the fractional complex transform method via local fractional derivatives is presented. Section 3 shows the applications of fractional complex transform to convert 3-D and 2-D wave equations on Cantor sets. Conclusions end the manuscript in Section 4.
2 Fractional complex transform method via local fractional derivatives
Proposition 1 If
where , then we have
where there exist the relations
Proof Let us consider the fractional complex transform (8), then we can write
and finally we conclude
Proposition 2 Assuming that (8) is valid, then we can transfer
where there exist the following relations:
Proof Taking the Cantorian coordination pairs (8) yields
In a similar manner as in the previous proposition, we obtain
Therefore, we conclude that
Proposition 3 Let us assume that there is the fractional complex transform
Proof By using the fractional complex transform (19), we obtain
Proposition 4 Let us consider the following fractional complex transform (19) and
thus, we obtain
Proof Applying the fractional complex transform method (19), we obtain the following three equations:
3 Wave equations on Cantor sets
In this section, the applications of fractional complex transform method to handle three- dimensional wave equations on Cantor sets are considered. Comparison between the fractional complex transform method, derived from modified R-L derivatives, and fractional complex transform via local fractional derivatives is investigated.
Let us consider 3-D wave equation on Cantor sets (3). We now determine the fractional complex transform via local fractional derivatives
Let us consider the non-dimensional 2-D wave equation on Cantor sets.
We now determine the fractional complex transform via local fractional derivatives
such that Eq. (6) is rewritten
then we arrive at the following formula:
Following the above results, we revisit the fractional complex transform method via local fractional derivatives, Eq. (12) are suggested by
for any and , which implies that fractal dimensions of transferring pairs are α.
In this manuscript, we consider that the fractional complex transform method is derived from the local fractional differential operator, which is set up on fractals. The obtained results on Cantor sets are related to physical phenomenon in Cantorian time-space. It is supposed that the transferring pairs are related to fractal measure that could be fundamental in understanding of the Cantorian monadic structure of quantum space time. The reported results have a potential application in observing the structure of differential equations from micro-physical to macro-physical behavior of substance in the real world.
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Dedicated to Professor Hari M Srivastava.
The authors would like to thank the editor and the referees for their useful comments and remarks. The work is supported by the Natural Science Foundation of Tianjin, China (No. 10JCZDJC25100).
The authors declare that they have no competing interests.
Authors contributed equally and in writing this article. Authors read and approved the final manuscript.
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Su, W., Yang, X., Jafari, H. et al. Fractional complex transform method for wave equations on Cantor sets within local fractional differential operator. Adv Differ Equ 2013, 97 (2013). https://doi.org/10.1186/1687-1847-2013-97
- fractional complex transform method
- wave equations
- local fractional differential operators
- Cantor sets