Hindawi Publishing Corporation Mathematical Problems in Engineering Volume 2015, Article ID 289387, 7 pages http://dx.doi.org/10.1155/2015/289387
Research Article On Generalized Fractional Kinetic Equations Involving Generalized Bessel Function of the First Kind Dinesh Kumar,1 S. D. Purohit,2 A. Secer,3 and A. Atangana4 1
Department of Mathematics & Statistics, J. N. Vyas University, Jodhpur 342001, India Department of Basic Sciences (Mathematics), College of Technology and Engineering, M. P. University of Agriculture and Technology, Udaipur, Rajasthan 313001, India 3 Department of Mathematical Engineering, Yildiz Technical University, Davutpasa, 34210 Istanbul, Turkey 4 Institute for Groundwater Studies, University of the Free State, Bloemfontein 9300, South Africa 2
Correspondence should be addressed to A. Atangana;
[email protected] Received 18 July 2014; Revised 1 September 2014; Accepted 2 September 2014 Academic Editor: Hossein Jafari Copyright Β© 2015 Dinesh Kumar et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. We develop a new and further generalized form of the fractional kinetic equation involving generalized Bessel function of the first kind. The manifold generality of the generalized Bessel function of the first kind is discussed in terms of the solution of the fractional kinetic equation in the paper. The results obtained here are quite general in nature and capable of yielding a very large number of known and (presumably) new results.
1. Introduction and Preliminaries Bessel functions are playing the important role in studying solutions of differential equations, and they are associated with a wide range of problems in important areas of mathematical physics, like problems of acoustics, radiophysics, hydrodynamics, and atomic and nuclear physics. These considerations have led various workers in the field of special functions to explore the possible extensions and applications of the Bessel functions. Among many properties of Bessel functions, they also have investigated some possible extensions of the Bessel functions. The generalized Bessel function of the first kind ππ (π§) is defined for π§ β C \ {0} and π, π, π β C(R(π) > β1) by the following series [1, page 10, (1.15)] (for recent work, see also [2β6]): β
π§ 2π+π (β1)π ππ , ππ,π,π (π§) = ππ (π§) = β ( ) π!Ξ (π + (π + 1) /2 + π) 2 π=0 (1) where C denotes the set of complex numbers and Ξ(π) is the familiar Gamma function.
The special cases of series (1) can be obtained as follows. (i) If we put π = π = 1 in (1), then we obtain the familiar Bessel function of the first kind [7] of order π for π§, π β C with R(π) > β1 defined and represented by the following expressions (see also [1, 8]): β
π§ 2π+π (β1)π , ( ) π!Ξ (π + π + 1) 2 π=0
π½π (π§) = β
π§ β C.
(2)
(ii) Putting π = 1 and π = β1 in series (1), we get the modified Bessel function of the first kind of order π defined by (see [1, 7]) β
1 π§ 2π+π , ( ) π!Ξ (π + π + 1) 2 π=0
πΌπ (π§) = β
π§ β C;
(3)
the series given by (3) is also a special case of GaluΒ΄eβs generalized modified Bessel function [9] depending on parameters π = 0, 1, 2, . . . and π > β1, given as follows: β
(π§/2)2π+π , π!Ξ (π + ππ + 1) π=0
π πΌπ (π§) = β
π§ β C.
(4)
2
Mathematical Problems in Engineering (iii) Letting π = 2 and π = 1 in series (1), we have the spherical Bessel function of the first kind of order π defined by (see [1]) β
π
π π§ (β1) ( ) ππ (π§) = β β 2 π=0 π!Ξ (π + π + 3/2) 2
2π+π
,
π§ β C. (5)
Furthermore, Deniz et al. [10] considered the function ππ,π,π (π§), defined in terms of the generalized Bessel function ππ (π§), by the transformation π + 1 1βπ/2 ππ (βπ§) ππ,π,π (π§) = 2 Ξ (π + )π§ 2 π
β
π
π+1
(βπ) π§ , π (]) 4 π π! π=1
=π§+β
decline the index π and integrate the standard kinetic equation (9), we have π (π‘) β π0 = βπ 0 π·β1 π‘ π (π‘) ,
where 0 π·β1 π‘ is the special case of the Riemann-Liouville integral operator 0 π·β] π‘ defined as β] 0 π·π‘ π (π‘) =
Ξ (π + π) Ξ (π)
(12)
β
(β1)π (ππ‘)]π . Ξ + 1) (]π π=0
π (π‘) = π0 β
(13)
Further, Saxena and Kalla [17] considered the following fractional kinetic equation:
(π β π := {1, 2, 3, . . .})
(π β C \ π0β ) . (7)
Fractional differential equations appear more and more frequently for modeling of relevant systems in several fields of applied sciences. These equations play important roles, not only in mathematics, but also in physics, dynamical systems, control systems, and engineering, to create the mathematical model of many physical phenomena. In particular, the kinetic equations describe the continuity of motion of substance and are the basic equations of mathematical physics and natural science. Therefore, in literature we found several papers that analyze extensions and generalizations of these equations involving various fractional calculus operators. One may, for instance, refer to such type of works by [11β23]. Haubold and Mathai [13] have established a functional differential equation between rate of change of reaction, the destruction rate, and the production rate as follows: (8)
where π = π(π‘) is the rate of reaction, π = π(π) is the rate of destruction, π = π(π) is the rate of production, and ππ‘ denotes the function defined by ππ‘ (π‘β ) = π(π‘ β π‘β ), π‘β > 0. Haubold and Mathai studied a special case of (8), when spatial fluctuations or inhomogeneities in the quantity π(π‘) are neglected, is given by the equation πππ = βππ ππ (π‘) , ππ‘
(11)
and have provided the solution of (12) as follows:
(π = 0)
ππ = βπ (ππ‘ ) + π (ππ‘ ) , ππ‘
π‘ > 0, R (]) > 0.
π (π‘) β π0 = βπ] 0 π·β] π‘ π (π‘)
(6)
:= {0, β1, β2, . . .} and (π)π is the where ] = π + (π + 1)/2 β Pochhammer symbol defined (for π β C) by
=
π‘ 1 β« (π‘ β π )]β1 π (π ) ππ , Ξ (]) 0
Haubold and Mathai [13] have given the fractional generalization of the standard kinetic equation (10) as
π0β
{1 (π)π := { π + 1) β
β
β
(π + π β 1) { (π
(10)
(9)
together with the initial condition that ππ (π‘ = 0) = π0 , is the number of density of species π at time π‘ = 0, ππ > 0. If we
π (π‘) β π0 π (π‘) = βπ] ( 0 π·β] π‘ π) (π‘) ,
(R (]) > 0) , (14)
where π(π‘) denotes the number density of a given species at time π‘, π0 = π(0) is the number density of that species at time π‘ = 0, π is a constant, and π β πΏ(0, β). By applying the Laplace transform to (14), we have πΏ [π (π‘)] (π) = π0
πΉ (π) 1 + π] πβ] β
π
= π0 ( β (βπ] ) πβπ] ) πΉ (π) π=0
σ΅¨σ΅¨ π σ΅¨σ΅¨ σ΅¨ σ΅¨ (π β π0 , σ΅¨σ΅¨σ΅¨ σ΅¨σ΅¨σ΅¨ < 1) , σ΅¨σ΅¨ π σ΅¨σ΅¨ (15)
where the Laplace transform [24] is defined by β
πΉ (π) = πΏ [π (π‘)] = β« πβππ‘ π (π‘) ππ‘, 0
R (π) > 0.
(16)
The aim of this paper is to develop a new and further generalized form of the fractional kinetic equation involving generalized Bessel function of the first kind. The manifold generality of the generalized Bessel function of the first kind is discussed in terms of the solution of the above fractional kinetic equation. Moreover, the results obtained here are quite capable of yielding a very large number of known and (presumably) new results.
2. Solution of Generalized Fractional Kinetic Equations In this section, we will investigate the solution of the generalized fractional kinetic equations. The results are as follows.
Mathematical Problems in Engineering
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Theorem 1. If π > 0, ] > 0, π, π, π, π‘ β C, and R(π) > β1, then for the solution of the equation π (π‘) β π0 ππ,π,π (π‘) = βπ] 0 π·β] π‘ π (π‘) ,
(17)
Taking Laplace inverse of (20) and using πΏβ1 {πβ] } = π‘]β1 /Ξ(]), R(]) > 0, we have πΏβ1 {π (π)} β
(βπ)π 2β(2π+π) Ξ (2π + π + 1) π!Ξ (π + π + (π + 1) /2) π=0
= π0 β
there holds the formula:
β
β
π
π‘ (βπ) Ξ (2π + π + 1) ( ) π!Ξ + π + + 1) /2) 2 (π (π π=0
π (π‘) = π0 β
Γ πΏβ1 {β (β1)π π]π πβ(2π+π+]π+1) } ,
2π+π
π=0
(18)
Γ πΈ],2π+π+1 (βπ] π‘] ) ,
π (π‘) β
(βπ)π 2β(2π+π) Ξ (2π + π + 1) π!Ξ (π + π + (π + 1) /2) π=0
= π0 β where πΈ],2π+π+1 (β
) is the generalized Mittag-Leffler function [25].
β
Γ {β (β1)π π]π π=0
Proof. The Laplace transform of the Riemann-Liouville fractional integral operator is given by [26, 27]
π‘(2π+π+]π) } Ξ (]π + 2π + π + 1)
β
(βπ)π 2β(2π+π) Ξ (2π + π + 1) 2π+π π‘ π!Ξ (π + π + (π + 1) /2) π=0
= π0 β β] πΏ { 0 π·β] π‘ π (π‘) ; π} = π πΉ (π) ,
(19)
β
Γ {β (β1)π π]π where πΉ(π) is defined in (16). Now, applying the Laplace transform to both sides of (17), we get
π=0 β
π‘ 2π+π (βπ)π Ξ (2π + π + 1) ( ) π!Ξ (π + π + (π + 1) /2) 2 π=0 β
= π0 πΏ [ππ,π,π (π‘) ; π] β π
π‘]π } Ξ (]π + 2π + π + 1)
= π0 β
πΏ [π (π‘) ; π] ]
(21)
Γ {β (β1)π π]π
πΏ [ 0 π·β] π‘ π (π‘) ; π] ,
π=0
π‘]π }, Ξ (]π + 2π + π + 1)
π (π‘)
π (π) β
βππ‘
= π0 β« π 0
β
π‘ 2π+π (βπ)π Ξ (2π + π + 1) ( ) π!Ξ (π + π + (π + 1) /2) 2 π=0
β
π‘ 2π+π (βπ)π ( ) β π!Ξ (π + π + (π + 1) /2) 2 π=0
= π0 β
Γ πΈ],2π+π+1 (βπ] π‘] ) .
β π] πβ] π (π) ,
This completes the proof of Theorem 1.
π (π) [1 + π] πβ] ]
If we set π = π = 1 in (17), then generalized Bessel function ππ,π,π (π§) reduces to Bessel function of the first kind π½π (π§) given by (2), and we arrive at the following result.
β
β (βπ)π 2β(2π+π) β« πβππ‘ π‘2π+π ππ‘ π!Ξ (π + π + (π + 1) /2) 0 π=0
= π0 β β
Ξ (2π + π + 1) (βπ)π 2β(2π+π) , π!Ξ + π + + 1) /2) (π (π π2π+π+1 π=0
= π0 β
Corollary 2. If π > 0, ] > 0, π, π‘ β C, and R(π) > β1, then for the solution of the equation
π (π)
π (π‘) β π0 π½π (π‘) = βπ] 0 π·β] π‘ π (π‘) ,
(22)
β
(βπ)π 2β(2π+π) Ξ (2π + π + 1) π!Ξ (π + π + (π + 1) /2) π=0
= π0 β
there holds the formula: β
(β1)π Ξ (2π + π + 1) π‘ 2π+π ( ) π!Ξ (π + π + 1) 2 π=0
β] π
β (1) [β (π/π) ] } { π Γ {πβ(2π+π+1) β }. (π)! π=0 } {
π (π‘) = π0 β (20)
Γ πΈ],2π+π+1 (βπ] π‘] ) .
(23)
4
Mathematical Problems in Engineering
Further, taking π = 1 and π = β1 in (17), then we obtain result of generalized fractional kinetic equation having modified Bessel function of the first kind. Corollary 3. If π > 0, ] > 0, π, π‘ β C, and R(π) > β1, then for the solution of the equation π (π‘) β π0 πΌπ (π‘) = βπ] 0 π·β] π‘ π (π‘) ,
(24)
where πΉ(π) is defined in (16). Now, applying the Laplace transform to both sides of (28), we get πΏ [π (π‘) ; π] = π0 πΏ [ππ,π,π (π] π‘] ) ; π] β π] πΏ [ 0 π·β] π‘ π (π‘) ; π] , π (π) β
(βπ)π π!Ξ (π + π + (π + 1) /2) π=0
β
there holds the formula:
(31)
= π0 β« πβππ‘ β 0
β
Ξ (2π + π + 1) π‘ ( ) π!Ξ (π + π + 1) 2 π=0
π (π‘) = π0 β
2π+π
(25)
Γ πΈ],2π+π+1 (βπ] π‘] ) .
Γ(
2π+π
π] π‘] ) 2
β π] πβ] π (π) ,
π (π) [1 + π] πβ] ]
Letting π = 2 and π = 1 in (17), then generalized Bessel function ππ,π,π (π§) reduces to the spherical Bessel function of the first kind ππ (π§) given by (5), and we obtain the following interesting result.
= π0 β
Corollary 4. If π > 0, ] > 0, π, π‘ β C, and R(π) > β1, then for the solution of the equation
= π0 β
π (π‘) β π0 ππ (π‘) = βπ] 0 π·β] π‘ π (π‘) ,
(26)
2π+π
β (βπ)π (π] /2) β« πβππ‘ π‘2π]+]π+1β1 ππ‘ π!Ξ (π + π + (π + 1) /2) 0 π=0 β
2π+π
(βπ)π (π] /2) Ξ (2π] + ]π + 1) , π!Ξ + π + + 1) /2) (π (π π2π]+]π+1 π=0 β
π (π) 2π+π
Ξ (2π] + ]π + 1) (βπ)π (π] /2) π!Ξ (π + π + (π + 1) /2) π=0 β
= π0 β
there holds the solution of (22) π β (β1)π Ξ (2π + π + 1) π‘ 2π+π π (π‘) = π0 β β ( ) 2 π=0 π!Ξ (π + π + 3/2) 2
β] π
(27)
] ]
Γ πΈ],2π+π+1 (βπ π‘ ) . Theorem 5. If π > 0, ] > 0, π, π, π, π‘ β C, and R(π) > β1, then for the solution of the equation π (π‘) β π0 ππ,π,π (π] π‘] ) = βπ] 0 π·β] π‘ π (π‘) ,
(28)
β (1) [β (π/π) ] } { π Γ {πβ(2π]+]π+1) β }. (π)! π=0 } {
Taking Laplace inverse of (32) and using πΏβ1 {πβ] } = π‘]β1 /Ξ(]), R(]) > 0, we have πΏβ1 {π (π)} 2π+π
Ξ (2π] + ]π + 1) (βπ)π (π] /2) = π0 β π!Ξ + π + (π (π + 1) /2) π=0 β
there holds the formula: 2π+π
β
(βπ)π Ξ (2π] + ]π + 1) π] π‘] ( ) π!Ξ (π + π + (π + 1) /2) 2 π=0
π (π‘) = π0 β
β
Γ πΏβ1 {β (β1)π π]π πβ(2π]+]π+]π+1) } ,
(29)
π=0
Γ πΈ],(2π+π)]+1 (βπ] π‘] ) , π (π‘) where πΈ],2π]+]π+1 (β
) is the generalized Mittag-Leffler function. Proof. The Laplace transform of the Riemann-Liouville fractional integral operator is given by [26] β]
= π πΉ (π) ,
(30)
2π+π
Ξ (2π] + ]π + 1) (βπ)π (π] /2) = π0 β π!Ξ + π + (π (π + 1) /2) π=0 β
β
πΏ { 0 π·β] π‘ π (π‘) ; π}
(32)
Γ {β (β1)π π]π π=0
π‘](2π+π+π) } Ξ (]π + 2π] + ]π + 1)
Mathematical Problems in Engineering
5
2π+π
Ξ (2π] + ]π + 1) ](2π+π) (βπ)π (π] /2) = π0 β π‘ π!Ξ + π + (π (π + 1) /2) π=0 β
β
Further, if we put π = 2 and π = 1 in (28), then we arrive at the following interesting result. Corollary 8. If π > 0, ] > 0, π, π‘ β C, and R(π) > β1, then for the solution of the equation
π‘]π } Γ {β (β1) π Ξ (]π + 2π] + ]π + 1) π=0 π
]π
π (π‘) β π0 ππ (π] π‘] ) = βπ] 0 π·β] π‘ π (π‘) ,
2π+π
β
(βπ)π Ξ (2π] + ]π + 1) π] π‘] = π0 β ( ) π!Ξ (π + π + (π + 1) /2) 2 π=0 β
Γ {β (β1)π π]π π=0
the following result holds:
]π
π‘ }, Ξ (] (π + 2π + π) + 1)
2π+π
π β (β1)π Ξ (2π] + ]π + 1) π] π‘] π (π‘) = π0 β β ( ) 2 π=0 π!Ξ (π + π + 3/2) 2
π (π‘) (βπ)π Ξ (2π] + ]π + 1) π] π‘] = π0 β ( ) π!Ξ (π + π + (π + 1) /2) 2 π=0
where ππ (π§) is the spherical Bessel function of the first kind.
] ]
Γ πΈ],(2π+π)]+1 (βπ π‘ ) . (33) This completes the proof of Theorem 5.
Theorem 9. If π > 0, π > 0, ] > 0, π, π, π, π‘ β C, π =ΜΈ π, and R(π) > β1, then for the solution of the equation π (π‘) β π0 ππ,π,π (π] π‘] ) = βπ] 0 π·β] π‘ π (π‘) ,
If we set π = π = 1 in Theorem 5, then generalized Bessel function ππ,π,π (π§) reduces to Bessel function of the first kind π½π (π§), and we arrive at the special case of (28).
there holds the formula:
Corollary 6. If π > 0, ] > 0, π, π‘ β C, and R(π) > β1, then for the solution of the equation
π (π‘) = π0 β
] ]
]
π (π‘) β π0 π½π (π π‘ ) = βπ
β] 0 π·π‘ π (π‘) ,
(β1)π Ξ (2π] + ]π + 1) π] π‘] ( ) π!Ξ (π + π + 1) 2 π=0
π (π‘) = π0 β
(35)
] ]
Γ πΈ],(2π+π)]+1 (βπ π‘ ) .
Corollary 7. If π > 0, ] > 0, π, π‘ β C, and R(π) > β1, then for the solution of the equation π (π‘) β π0 πΌπ (π] π‘] ) = βπ] 0 π·β] π‘ π (π‘) ,
(36)
Γ πΈ],(2π+π)]+1 (βπ] π‘] ) .
πΏ [π (π‘) ; π]
π (π) [1 + π] πβ] ] 2π+π
(βπ)π (π] /2) Ξ (2π] + ]π + 1) , π!Ξ (π + π + (π + 1) /2) π2π]+]π+1 π=0 β
= π0 β π (π)
2π+π
Ξ (2π] + ]π + 1) (βπ)π (π] /2) π!Ξ (π + π + (π + 1) /2) π=0 β
= π0 β
the following result holds: 2π+π
Ξ (2π] + ]π + 1) π] π‘] ( ) π!Ξ (π + π + 1) 2 π=0
Γ πΈ],(2π+π)]+1 (βπ] π‘] ) .
(41)
= π0 πΏ [ππ,π,π (π] π‘] ) ; π] β π] πΏ [ 0 π·β] π‘ π (π‘) ; π] ,
On taking π = 1 and π = β1 in (28), then generalized Bessel function ππ,π,π (π§) reduces to Bessel function of the first kind π½π (π§), and we get the following result.
β
(βπ)π Ξ (2π] + ]π + 1) π] π‘] ( ) π!Ξ (π + π + (π + 1) /2) 2 π=0
Proof. Applying the Laplace transform to both sides of (40), we get
2π+π
β
(40)
2π+π
β
(34)
the following result holds:
π (π‘) = π0 β
(39)
Γ πΈ],(2π+π)]+1 (βπ] π‘] ) ,
2π+π
β
(38)
(1)π (β1)π πβ]π π]π }. (π)! π=0 β
(37)
Γ {πβ(2π]+]π+1) β
(42)
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Mathematical Problems in Engineering
References
Taking Laplace inverse of (42), we arrive at β1
πΏ {π (π)} 2π+π
Ξ (2π] + ]π + 1) (βπ)π (π] /2) π!Ξ + π + (π (π + 1) /2) π=0 β
= π0 β
β
Γ πΏβ1 {β (β1)π π]π πβ(2π]+]π+]π+1) } , π=0
π (π‘) 2π+π
β
(βπ)π Ξ (2π] + ]π + 1) π] π‘] ( ) π!Ξ (π + π + (π + 1) /2) 2 π=0
= π0 β
β
Γ {β (β1)π π]π π=0
(43)
π‘]π }, Ξ (] (π + 2π + π) + 1)
π (π‘) β
2π+π
(βπ)π Ξ (2π] + ]π + 1) π] π‘] ( ) π!Ξ (π + π + (π + 1) /2) 2 π=0
= π0 β
Γ πΈ],(2π+π)]+1 (βπ] π‘] ) . This completes the proof of Theorem 9. Remark 10. The special cases for Theorem 9 can be developed on similar lines to that of Corollaries 6β8, but we do not state here due to lack of space.
3. Conclusion In this paper we have studied a new fractional generalization of the standard kinetic equation and derived solutions for it. It is not difficult to obtain several further analogous fractional kinetic equations and their solutions as those exhibited here by main results. Moreover, by the use of close relationships of the generalized Bessel function of the first kind ππ (π§) with many special functions, we can easily construct various known and new fractional kinetic equations.
Conflict of Interests The authors declare that there is no conflict of interests regarding the publication of this paper.
Acknowledgment The authors are thankful to the referee for the very careful reading and the valuable suggestions.
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