Non commutative classical and Quantum fractionary Cosmology: FRW case.

In this work we shall explore the eﬀects of noncommutativity in fractional classical and quantum schemes using the ﬂat Friedmmann-Robertson-Walker (FRW) cosmological model coupled to a scalar ﬁeld in the K-essence formalism. In previous work we have obtained the commutative solutions in both regimes into the fractional framework. We introduce noncommutative variables, considering that all minisuper-space variables q inc do not commute, so the symplectic structure was modiﬁed. In the quantum regimen, the probability density presents new structure corresponding to the value of the noncommutativity parameter


I. INTRODUCTION
The study and applications of fractional calculus (FC) to cosmology is a new line of research, that was born approximately twenty years ago.We have recently worked along this line in the theory of K-essence due that in [1] it is mentioned that by quantifying different epochs of the K-essence theory, a fractional Wheeler-DeWitt equation (WDW) in the scalar field component is naturally obtained in different stages of the universe [2,3], however we have not found any work in the literature, where the idea of non-commutativity (NC) is applied to this formalism, which is why we are interested in studying the effects of NC variables from the fractional calculus approach, and seeing their effects on the exact solutions or mathematical structure of the same.It is well known that there are various ways to introduce non-commutativity in the phase space and that they produce different dynamical systems from the same Lagrangian [4], as can be shown for example in reference [5] and references cited therein.Therefore, distinct choices for the NC algebra among the brackets render distinct dynamic systems.We will use non-commutativity in the coordinate space, which is where we have some working practice in the past, leaving the application of moments space for the future, [6][7][8][9][10][11], where other quantities such as angular momentum appear between coordinates and momenta [12,13].
Usually, K-essence models are restricted to the Lagrangian density of the form [14][15][16][17][18][19] where the canonical kinetic energy is given by G(X) = X = − 1 2 ∇ µ ϕ∇ µ ϕ, f (ϕ) is an arbitrary function of the scalar field ϕ, and g is the determinant of the metric.K-essence was originally proposed as a model for inflation, and then as a model for dark energy, along with explorations of unifying dark energy and dark matter.During the development of research in non-commutative formalism within fractional cosmology in k-essence theory, the presence of non-commutativity that usually accompanied the term of the scale factor, here is disrupted, since essentially Non-commutativity is more present in the scalar field, modifying the mathematical structure that usually occurs in works in this direction in other non-fractional formalisms.
We construct the Lagrangian and Hamiltonian densities for the plane FLRW cosmological model, considering a barotropic perfect fluid for the scalar field in the variable X, and present the general case in commutative (II) and noncommutative formalism (III).We present the quantum version in both cases, in (IV) and (V), respectively.Finally, Section (VI) is devoted to discussions.

II. COMMUTATIVE FRACTIONAL CLASSICAL EXACT SOLUTION
We start with the following classical Lagrangian density that comes from the flat Friedmann-Robertson-Walker fractionary cosmological model coupled to a scalar field in the K-essence formalism [2] Using the standard definition of the momenta Π q µ = ∂L ∂ qµ , where q µ = (Ω, ϕ), we obtain and introducing them into the Lagrangian density, we obtain the canonical Lagrangian Performing the variation with respect to the lapse function N , δL canonical /δN = 0, the Hamiltonian constraint H = 0 is obtained, where the classical density is written as For simplicity we work in the gauge N = 24e In previous work [2], we found that the barotropic parameter in K-essence theory has the form ω X = 1 2α−1 , and the fractional parameter is With this, the Hamiltonian density is rewritten as then, the Hamilton equations are substituting these results in the Hamiltonian constraint, we have that where p 0 is an integration constant and p β = 72(2−β) With this and using the equation ( 9), the solution for the scale factor A(t) = e Ω becomes, and the solution for the scalar field ϕ is

III. NONCOMMUTATIVE FRACTIONAL CLASSICAL EXACT SOLUTION
We start with the following classical hamiltonian that comes from the flat Friedmann-Robertson-Walker fractionary cosmological model coupled to a scalar field in the K-essence formalism (8), written in term of the fractional parameter β = 2α 2α−1 and in particular gauge, where in order to find the commutative equation of motion, we use the classical phase space variables q µ = (Ω, ϕ), where the Poisson algebra for these minisuperspace variables are In the commutative model the solutions to the Hamiltonian equations are the same as in General Relativity, modified only by the fractional parameter.Now the natural extension is to consider the noncommutative version of our model, with the idea of non-commutative between the two variables (Ω nc , ϕ nc ), so we apply a deformation of the Poisson algebra.For this, we start with the usual Hamiltonian ( 8), but the symplectic structure is modify as follow where the ⋆ is the Moyal product [20], and the resulting Hamiltonian density is but the symplectic structure is the one that we know, the commutative one (16).It is well known that, there are two formalisms to study the non-commutative equations of motion, for the first formalism that we exposed has the original variables, but with the modified symplectic structure, and for the second formalism we use the shifted variables (Bopp shift approach) but with the original (commutative) symplectic structure in both approaches, we have the same result.
The commutation relations ( 16) can be implemented in terms of the commuting coordinates of the standard quantum mechanics ( Bopp shift) and it results in a modification of the potential like term of the Hamiltonian density and one possibility is, for example, These transformations are not the most general possible to define non-commutative fields.
With this in mind, our hamiltonian density has the form the Hamilton equations are with these equations, the solution for Π Ω is the same as in the commutative case, so the solution for the scale factor becomes where A(t) is the solution presented in equation ( 14).The solution for the scalar field is related with the Π Ω as for both commutative solutions, the scale factor y scalar field ϕ are obtained when the non-commutative parameter θ, goes to zero.

IV. COMMUTATIVE FRACTIONAL QUANTUM EXACT SOLUTION
The Wheeler-DeWitt (WDW) equation for this model is obtained by making the usual substitution Π q µ = −iℏ ∂ ∂q µ into (8) and promoting the classical Hamiltonian density in the differential operator, applied to the wave function Ψ(Ω, ϕ), ĤΨ = 0.Then, we have For simplicity, the factor e −3(2−β)Ω may be the factor ordered with ΠΩ in many ways.Hartle and Hawking [21] suggested what might be called semi-general factor ordering, which, in this case, would order the terms e where Q is any real constant that measures the ambiguity in the factor ordering in the variables Ω and its corresponding momenta.Thus, the equation ( 29) is rewritten as By employing the separation variables method for the wave function Ψ = A(Ω) B(ϕ), we have the following two differential equations for (Ω, ϕ) where B ± considers the sign in the differential equation.The fractional differential Equation (32) can be given in the fractional frameworks, following [22,23] and identifying where now, γ is the order of the fractional derivative taking values in 0 < γ ≤ 1; then, we can write the solution of the Equation ( 33) with a positive sign may be obtained by applying direct and inverse Laplace transforms [23], providing In the ordinary case, γ = 1; then, the solution is [23], Following the book of Polyanin [24] (page 179.10), we discovered the solution for the first equation for γ ̸ = 1, considering different values in the factor ordering parameter and both signs in the constant µ 2 , with order ν = ± Q 6(1−γ) , where we had written the second expression in terms of the fractional order γ = β 2 , and the solutions which become dependent on the sign of its argument; when µ 2 (for B − ), the Bessel function Z ν becomes the ordinary Bessel function J ν .When −1µ 2 (for B + ), this becomes the modified Bessel function K ν .For the particular values β = 2 (γ = 1), it will be necessary to solve the original differential equation for this variable.
Then, we have the probability density |Ψ| 2 by considering only B + , γ ̸ = 1, We will now report the solution for the β = 2, → γ = 1 case, which we have not reported before, considering the minus sign in the constant µ 2 , the general solution for the function and for the other sign +µ 2 , becomes and the corresponding solutions to (33) for both signs are so, the probability density becomes On the other hand, it is well-known that in the standard quantum cosmology, the wave function is unnormalized.There is no systematic method to do this, as the Hamiltonian density is not Hermitian.In particular cases, wave packets can be constructed, and from these wave packets we can construct a normalized wave function.In this work, we could not construct these wave packets.We hope to be able to do it in future studies.

V. NON-COMMUTATIVE FRACTIONAL QUANTUM EXACT SOLUTION
As already mentioned, we are looking for the non-commutative deformation of the flat FRW quantum cosmological model.In order to find the non-commutative generalization, we need to solve the non-commutative Einstein equation, this is a formidable task due to the highly non linear character of the theory, fortunately we can circumvent these difficulties by following Ref.[25].
Now we can proceed to the non-commutative model, we will consider, that the minisuperspace variables q i = (Ω, ϕ) do not commute, so that the symplectic structure is modified as follows in particular, we choose the following representation where the θ parameters are a measure of the non commutativity between the minisuperspace variables.The commutation relations (42) or (43) are not the most general ones to define a non-commutative field.
We consider the non-commutative hamiltonian density in a simple way, as It is well known that this non-commutativity can be formulated in term of noncommutative minisuperspace functions with the Moyal star product ⋆ of functions.The commutation relations (42) can be implemented in terms of the commuting coordinates of the standard quantum mechanics ( Bopp shift) and it results in a modification of the potential like term of the WDW equation [25,26], and one possibility is, for example, These transformation are not the most general possible to define noncommutative fields, However, these shifts modify the potential term in the following way As in the commutative case, we choose the wave function to be separable, Ψ(Ω, ϕ) = which can be rewritten as if we want this equation to be separable, we must choose to make the term within the square parentheses [ ] a constant, in particular ∓µ 2 , with this choice, we retrieve the commutative quantum equation for the function A, (31), with the same quantum solution (36).
At this point we want to note that in commutative quantum cosmology, the prefactor that accompanies its moments is not contemplated when we use a particular gauge, and usually the non-commutative parameter enters the solution of the Ω function, not that of scalar field ϕ.In this case, the appearance of the prefactor in fractional cosmology makes the solution in Ω remain the same, but not the part of the scalar field, where the non-commutative parameter appears and the mathematical structure is completely different.
That said, the expression (48) becomes since the non-commutative parameter θ is very small, we can stay until the first term in this one, obtaining in this fractional differential equation, when θ = 0 we recover the commutative equation for the quantum function C = B (32).Now we solve the equation (50) written as follows where For the particular value β = 2, we can observe that the equation (44), becomes the ordinary commutative quantum equation, then the quantum solutions, commutative and non-commutative, are the same in this approach to k-essence theory.
However, in the dust scenario 48ℏ .Equation (51) takes the form whose solution is given by Thus, the probability density becomes (considering only the real part of the complex exponential in θ) To make the figure 1, we use the ordinary Bessel function.We can see the effect of the combination of the parameters θ and µ, where the probability density undergoes a shift in the behavior of the scalar field, at the beginning and at the end, that is, modifying the structure.As we can see, at θ = 0, a crack appears, at θ = 0.1, it separates and a peak appears, at θ = 0.5, the peak decreases and disappears at θ = 1, when µ =5.However, the fact that some peaks no longer appear does not mean that they have been cancelled, but rather that, due to the change in probability density, the scales of these peaks are no longer on the graph.
In the figure 2, the previously mentioned pattern is repeated when the factor ordering parameter is Q = 1, but more noticeably in the shift towards the origin of the Ω variable.
In the figure 3 for the factor ordering Q = −1, the shift is slower, but persists.
For the other scenarios, employing the modified Bessel function, the behavior is very different, as shown in the figures 4, 5 and 6, when the combination of the parameters µ = 15 and θ = 0, 0.5, 0.8, 1, having decaying behavior in the direction of evolution of the scale factor like (Ω) and oscillatory behavior in the direction of the scalar field, or making the scalar field relevant in quantum evolution and remaining in classical evolution, as has been found in other alternative models to Einstein's theory [27][28][29][30][31][32][33].
Since, we do not know the initial conditions of the universe in the dust epoch, we have graphed both probability densities, where it is observed that the scalar field persists in the evolution of both densities, remaining as a remnant towards the classical evolution of the universe, being a cosmic background currently.
The global effect of the non-commutativity between the field coordinates of the system in fractional quantum cosmology scheme causes the probability density to shift or shrink in the opposite direction to the scale factor, causing the classical universe to emerge sooner, which would mean that the current universe should have more time than is usually mentioned, as in mentioned in the reference [34], employing the fractional framework.
On the other hand, if the order of the differential equation ( 51) is a rational, then solutions have two cases Taking into account the Laplace transform in [35], considering that where Applying the Laplace transform to all the terms in (55), we have Solving with respect to C(s), we get for the particular value β = 2, the two last terms can be consider as one, making that C ′ (0) + AC(0) = κ = constant, and for β = 1, the first and last term can be simplify to From the formula in [35] (page 40, equation (3.11) with a correction), we have adapting our parameters to the master equation (59), we have the following three cases 1. first term in (58), we use 2. second term in (58), we use 3. third term in (58), we use γ = 0, α = β, β = 1 Then, the inverse Laplace transform of (58), is Then, the inverse Laplace transform of (58), is For the case when A = ∓i θ 2 q α,γ and B = ±q α,γ , q α,γ = 24ℏ 2γ , we see that the complex solution can be read as where C(0) = a and C ′ (0) = b.For this case, the equation to solve is similarly, as in the previous case, we have which can be rewritten as

VI. CONCLUSIONS
During the development of research in the non-commutative formalism within fractional cosmology in k-essence theory, the presence of non-commutativity that usually accompanied the term of the scale factor, here is disrupted, since essentially Non-commutativity is more present in the scalar field, modifying the mathematical structure that usually occurs in works in this direction in other non-fractional formalisms.
In our non-commutative quantum development, the method of separation of variables does not appear in a traditional way as the sum of the operators in their variables, now it is produced as factors, thanks to this it can be separated, in addition, now complex fractional differential equations arise, even in cases with derivatives of integer order, which means that these solutions in the scalar field have a real part and an imaginary part.
In previous non-commutative quantum works [6,7,10], the term is usually modified with the scale factor, but in fractional cosmology in essence K, this term remains unchanged, only the scalar field term undergoes important modifications, in the sense that the probability density undergoes a shift back to the direction of the scale factor, causing classical evolution to arise earlier than in the commutative world.This effect is due to the non-commutativity between the field coordinates in this formalism, which is related to some crucial effects due to the fact of having a fractional equation, such that the age of the universe is greater, of the order of 13.8196 Gyr., or more [34].These results on fractal K-essence theory add to the fact that this formalism without considering ordinary matter is falsified with this approach according to the classical solutions that are identical using the FRW model [2], but it is found that this is a more general result mentioned in the reference [36].
Since the prefactor that is usually linked to the ordering of the factors under a certain gauge does not appear in the standard quantum Hamiltonian, the important contribution of noncommutativity appears in the wave function linked to the scale factors, which is why this term continues to persist.This causes the momentum associated with the scalar field to produce an additional total derivative term to the non-commutative fractional equation due to the Bopp shift in the scale factor term, producing in this case a significant contribution of the non-commutative parameter in the wave function, see equation (51).
and when ω X ∈ [−1, 0), thus β ∈ (0, 1].This is relevant because in the quantum regime, the Laplace transform of a fractional differential equation depends on the parameter n = [β] (integer part of the fractional parameter).