Higher-Spin Symmetries and Deformed Schrödinger Algebra in Conformal Mechanics

Toppan, Francesco; Valenzuela, Mauricio

doi:https://doi.org/10.1155/2018/6263150

Advances in Mathematical Physics

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Research Article | Open Access

Volume 2018 | Article ID 6263150 | https://doi.org/10.1155/2018/6263150

Higher-Spin Symmetries and Deformed Schrödinger Algebra in Conformal Mechanics

Francesco Toppan¹and Mauricio Valenzuela²

Academic Editor: Ziemowit Popowicz

Received11 May 2018

Revised21 Jul 2018

Accepted07 Aug 2018

Published02 Sept 2018

Abstract

The dynamical symmetries of -dimensional Matrix Partial Differential Equations with a Calogero potential (with/without the presence of an extra oscillatorial de Alfaro-Fubini-Furlan, DFF, term) are investigated. The first-order invariant differential operators induce several invariant algebras and superalgebras. Besides the invariance of the Calogero Conformal Mechanics, an invariant superalgebra, realized by first-order and second-order differential operators, is obtained. The invariant algebras with an infinite tower of generators are given by the universal enveloping algebra of the deformed Heisenberg algebra, which is shown to be equivalent to a deformed version of the Schrödinger algebra. This vector space also gives rise to a higher-spin (gravity) superalgebra. We furthermore prove that the pure and DFF Matrix Calogero PDEs possess isomorphic dynamical symmetries, being related by a similarity transformation and a redefinition of the time variable.

1. Introduction

In this paper we investigate the dynamical symmetries of -dimensional Matrix Partial Differential Equations with a Calogero [1] potential (with/without the presence of an extra oscillatorial de Alfaro-Fubini-Furlan, DFF, [2] term). The Matrix Partial Differential Equations correspond to Schrödinger Equations. The pure Calogero Hamiltonian is supersymmetric, while the DFF Hamiltonian is, as explained later, only “softly” supersymmetric. The first-order invariant differential operators induce several invariant algebras and superalgebras. Besides the invariance of the Calogero Conformal Mechanics, an invariant superalgebra, realized by first-order and second-order differential operators, is obtained. The invariant (super) algebras with an infinite tower of generators are given by the universal enveloping algebra of a deformed Heisenberg algebra [3–6]. It also contains a deformed version of the Schrödinger algebra (in both cases the deformation stems from the presence of a Klein operator). As a vector space the universal enveloping algebra carries the -graded higher-spin superalgebra .

The higher-spin superalgebra was introduced in [6] and applied to the construction of a Chern-Simons higher-spin gravity. In [6] it was also shown that is provided by the universal enveloping algebra of the superalgebra. The algebra was also employed to extend the Chern-Simons higher-spin gravity model [6] with fractional spin fields [7, 8].

We will show that these algebraic structures appear in the different context of nonrelativistic quantum mechanics in the presence of a Calogero potential, either with or without an extra harmonic potential term. We highlight the main features and results of our approach.

We use the standard tools (see, e.g., [9]) of dynamical symmetries of (matrix) PDEs. The operators under consideration are local (matrix) differential operators, in contrast to the nonlocal realizations given in [3–5] (see also [10]).

The construction based on an invariant PDE allows us to detect an invariant deformed Schrödinger algebra which has not been discussed in the existing literature. This deformation can be regarded as a deformation of the mass-central-charge of the algebra of Galileo boosts and translations by a term proportional to the Klein operator. This algebra is connected with Vasiliev’s superalgebra. As a vector space it is spanned by the same infinite set of differential operators which, on the other hand, are endowed with different brackets (ordinary commutators versus -graded commutators). We furthermore prove that the models with pure Calogero potentials and those with the extra DFF term possess isomorphic dynamical symmetry (super) algebras. This results from the fact that a triplet of matrix PDEs close an algebra. In a given canonical form, the Matrix PDE associated with the positive root of corresponds to the Schrödinger equation of the pure Matrix Calogero system (it would have been tantamount to work with the negative root of ), while a canonical form exists such that the Cartan generator is associated with the Schrödinger equation for the DFF Matrix Calogero system. The two canonical forms are related by a similarity transformation coupled with a redefinition of the time variable.

The pure Matrix Calogero Hamiltonian is an Supersymmetric Quantum Mechanical System. On the other hand the DFF Matrix Calogero Hamiltonian is not supersymmetric (this is a common feature of superconformal models possessing an oscillatorial term; see [11]); it is, nevertheless, related to supersymmetric Hamiltonians via a shift realized by a diagonal operator; following [12] we can state that, in this case, the system enjoys a “soft” supersymmetry.

In the last part of the paper we discuss the appearance of the higher-spin superalgebra, which is now interpreted as a dynamical symmetry of the models under consideration (the higher-spin symmetry of the free nonrelativistic particle case was pointed out in [13]).

The scheme of the paper is as follows. In Section 2 the Matrix Calogero PDEs (with/without the DFF oscillatorial potential term) are introduced. It is explained why, in the presence of a Calogero potential, a Matrix PDE is needed to get (deformed) Heisenberg symmetry generators. The dynamical symmetry generators of these systems are computed. In Section 3 their dynamical symmetry subalgebras are investigated. In particular the superalgebra (realized by first-order and second-order differential symmetry operators) is derived, as well as the deformed Heisenberg algebra. The existence of an supersymmetry for the pure Matrix Calogero Hamiltonian and a “soft” supersymmetry for the DFF Matrix Calogero Hamiltonian is pointed out. The connection between pure and DFF Matrix Calogero PDEs is presented in Section 4. In Section 5 it is shown that both a deformed Schrödinger algebra and a higher-spin superalgebra appear as dynamical symmetries of (pure and DFF) Matrix Calogero PDEs. In the Conclusions we comment our results and sketch some directions for future investigations.

2. Matrix PDEs with Calogero Potentials

It is convenient to systematically review the arising of higher-spin (super) algebras in Calogero systems by analyzing the symmetry, realized by first-order differential operators, of the (matrix) Partial Differential Equations containing Calogero potentials. This analysis uses well-known methods.

To fix our conventions, if is a Hermitian (matrix) PDE, a first-order differential operator is a symmetry operator if it satisfies the equationfor a given matrix-valued function .

In our analysis we do not need to introduce symmetry operators which, unlike (1), are defined by a “right” convention; i.e., . One should note, on the other hand, that the symmetry operator is not necessarily Hermitian (in that case its Hermitian conjugate satisfies the “right” equation with ).

Before investigating matrix PDEs (our results require a matrix whose entries are differential operators) we recall some basic features of the standard Partial Differential Equations. The Schrödinger equation in dimension induces the maximal -generator Schrödinger algebra of invariant operators for three choices (up to normalization and trivial shift) of the potential [14–17]. is either constant (corresponding to the free equation), linear (giving rise to Airy’s functions), or quadratic (corresponding to the harmonic oscillator). For all other choices of the potential the symmetry algebra possesses fewer generators. This is particularly the case for the Calogero potential.

2.1. The Ordinary Calogero PDEs

The pure Calogero PDE is defined by the operatorwhere is the coupling constant.

We mention that the operator (2) can be applied to describe the dynamics of a two-particle Calogero model with omitted center of mass degree of freedom. The operator also appears in the dynamics of a test particle in the proximity of the horizon of a Reissner-Nordström black hole; see [18]. The symmetry algebra for the Calogero potential is . It contains four generators. Two extra generators, corresponding to the Heisenberg subalgebra of the Schrödinger algebra, are no longer encountered in the presence of a nonvanishing, , Calogero potential. We have in this case, as suitably normalized symmetry generators,They satisfy the nonvanishing commutatorswhile is the identity operator.

The nonvanishing commutators involving areBased on (1), this means thatThe conveniently chosen symmetry operators,are Hermitian.

One should note that the four (3) symmetry operators do not depend on the Calogero coupling constant .

In the case of the Calogero potential with the extra addition (see [2]) of the DFF quadratic term, we can introduce without loss of generality (by suitably normalizing the frequency of the harmonic oscillator), the operator given byIn this case as well we obtain a symmetry algebra. Its four generators areThe nonvanishing commutators areIt is worth pointing out that, when , for no other nonconstant , the potential produces a -generator symmetry algebra. In particular, for a linear (, ), we only recover a -generator symmetry algebra.

The arising of a (generalized) Heisenberg and of higher-spin (super) algebras requires a Matrix Calogero PDE. For this purpose a matrix system is sufficient.

2.2. The -Matrix Calogero PDEs

We check under which conditions we can obtain off-diagonal symmetry generators for a -matrix differential operator containing Calogero potentials.

Let us denote with the matrix with entry at the -th column and -th row and otherwise. We are looking for symmetry generators of the matrix PDE defined by the diagonal operatorSince is a diagonal operator, from either (3) or (9), we obtain diagonal symmetry generators ( of them are associated with the upper diagonal element ; the remaining generators are associated with the lower diagonal element ).

Concerning the nondiagonal symmetry operators, they should be expressed asfor appropriate functions , , , , , and .

We assume the potentials to bewith . Without loss of generality we can set, via similarity transformations, .

It is easily realized that the requirementis implied by the existence of a nonvanishing solution for the respective equationsThe constraint on the functions entering , is derived with standard techniques. The solutions of constraint (15) for the functions entering (12) are presented here. We get, for ,Similar equations are obtained for entering .

The above system of equations tells us that, in particular, the conditionhas to be fulfilled. After setting , it is solved byWe can therefore write the most general (11) operator admitting off-diagonal symmetry operators. It depends on the parameter , whose values are either for the pure Calogero system, or for the Calogero system with the extra oscillatorial term. Due to (14), the oscillatorial term is the same in both upper and lower diagonal entries. We can write, with a proper normalization,The operator ,plays different roles, depending on the context. It is either the Fermion Parity Operator (in Supersymmetric Quantum Mechanics) or the Klein operator (entering the definition of the deformed oscillators). We note that, in particular, .

In both cases we get two upper triangular and two lower triangular symmetry operators.

At we have, up to normalization,At we have, up to normalization,

3. Symmetry Superalgebra of the Pure Calogero Matrix System

For the pure Calogero Matrix (19) operator we can introduce the basis of off-diagonal Hermitian operators. They are given byBy constructionSince, for given by (20), we havethe quantum mechanical system defined by is supersymmetric. Indeed,whereThe following nonvanishing anticommutators are recovered:where, besides given in (30), we haveThe four odd (fermionic) operators , together with the four even (bosonic) operators , close the finite simple Lie superalgebra , as it can be easily checked. By construction commute with . Therefore, is an invariant subalgebra of the pure Matrix Calogero system.

We have indeed, for any generator ,The set of generators (and, similarly, ) close an superalgebra. (respectively, ) are odd generators. If, nevertheless, we compute their commutators, we obtaintherefore recovering the (-)deformed Heisenberg algebra.

For future convenience we also consider the non-Hermitian linear combinationswhich satisfy

4. Connection between Pure and DFF Calogero Matrix Systems

It is convenient to normalize the root symmetry generators of the pure Calogero system , given in (2), according to , with entering (3). The corresponding symmetry operators for the pure Calogero Matrix system , given in (19), are .

It is convenient to redefine asIndeed, a triplet of operators, , carrying a representation generated by , is encountered. We haveOne should note that the commutator is vanishing, so that no further operator is generated.

The operators close an algebra. We have, indeed,The connection between the pure Matrix Calogero system obtained from (19) at and the Matrix Calogero-DFF system obtained from (19) at can now be made explicit, by adapting to the present case the construction discussed in [19]. Under redefinition of the time coordinate and a similarity transformation, the suitably normalized Cartan operator ( is a constant) is mapped into the DFF operator. As a corollary, the symmetry operators of the pure Calogero system () are mapped into the symmetry operators of the Calogero system with the oscillatorial () term.

The new time variable is introduced from the equation( is here a suitable constant), such that the time-derivative operator entering can be expressed as . This is accomplished by choosing , .

We point out that for our purposes the time can be complexified and the isomorphism established; a reality condition imposed on the new parameter entering (42) allows interpreting it as the time for the Hamiltonian with oscillatorial term.

The further similarity transformation which maps the symmetry generators of into the symmetry generators of is given bywhereIt is rather straightforward to check that, in particular, we getThe similarity transformation (43) and the time redefinition (42) apply to all matrix symmetry generators. We have, in particular,The operators in the r.h.s. coincide, for the time variable , with the corresponding operators given in (22). It follows, in particular, that is a symmetry superalgebra of the matrix system with the oscillatorial term. Since the generators are connected by similarity transformations their (anti)commutation relations are preserved.

It is convenient to define the Hermitian generators through the positionsIn the presence of the oscillatorial term we obtain two supersymmetric quantum mechanics, sinceThe supersymmetric Hamiltonians are, respectively, given byThe supersymmetric Hamiltonians correspond to a shift of the original Hamiltonian with oscillatorial term, whose expression isIndeed, we haveThe shift operators commute with ; we have .

An symmetry superalgebra can be expressed in terms of the operators , and their anticommutators, whereThe Hamiltonian is recovered from the anticommutator

The remaining two operators () that, together with , close the superalgebra are given byThe operators induce the deformed Heisenberg algebra since their commutator is given byWe point out that, following [12], the Hilbert space can be taken to be given by a pair of square-integrable functions on the real line. It is then given by a direct sum of lowest-weight representations of the spectrum-generating superalgebra, with lowest weights determined by . Unlike the -dimensional theories discussed in [12, 20], is not quantized to be an integer or a half-integer value. One should further note that, for -dimensional matrix PDEs, the spectrum-generating superalgebra itself, not just its representations, is determined by , being given , with a linear relation between and (see [12]).

5. Deformed Schrödinger and Higher-Spin (Super) Algebras

We are now in the position to discuss the arising of infinitely generated deformed Schrödinger algebra and higher-spin superalgebra as dynamical symmetries of the pure and DFF Matrix Calogero PDEs. Pure and DFF Matrix Calogero dynamical symmetries are isomorphic, since they are related by the time redefinition (42) and the similarity transformation (43). It is therefore sufficient to present the results for the pure Matrix Calogero case.

The introduction of the deformed Schrödinger algebra requires to couple an invariant subalgebra to a pair of deformed Heisenberg oscillators. Several invariant deformed Schrödinger algebras can be recovered as a consequence. Indeed we can pick, e.g., as subalgebra, either the first-order differential operators , with denoting one of the four operators entering (3), or the second-order differential operators entering the even sector of the superalgebra and recovered from (30) and (32)-(34). Similarly, up to normalization, the deformed Heisenberg operators can be given by several possible pairs. We have, e.g., , , or , whose respective deformed Heisenberg commutators are given in formulas (36) and (38). The choice , , so thatwithis particularly convenient. The limit exists. At (in the absence of the Calogero potential) they coincide, respectively, with the ordinary Galileo boost and space translation multiplied by (namely, the operator exchanging the fields entering a -component multiplet). The closure, at , of the ordinary -dimensional Schrödinger algebra, with the extra first-order differential operators introduced above, immediately follows.

We should recall that, for the original Calogero and de Alfaro-Fubini-Furlan models, the wavefunctions in [1, 2] (see also [21]) are defined on the half-line and respect the Dirichlet boundary condition at the origin. It was shown in [22, 23] that, in a certain range of the Calogero coupling constant , a more general class of self-adjoint domain for the one-dimensional Calogero Hamiltonian is allowed. It consists of square-integrable functions defined on the real line (see [22, 23] for details). The construction of the Hilbert space for the Matrix Calogero and de Alfaro-Fubini-Furlan oscillators induced by a spectrum-generating superalgebra was presented in [12, 24]. We summarize here the main properties. The Hilbert space is given by an -ple of square-integrable functions on the line. It is determined by a direct sum of the superalgebra lowest-weight representations. The lowest-weight vectors are defined by imposing the condition , being an annihilation operator (in the present work is the annihilation operator defined in (52)). A simple inductive proof shows that

(i) if is normalized as a -ple of square-integrable functions, all created states are normalized as -ple of square-integrable functions for any positive integer

(ii) if for , for any positive integer all created states in the limit (this lowest-weight representation can be interpreted to be formed by states belonging to the half-line and satisfying the Dirichlet condition at the origin)

The analysis of [12, 24], applied to the (19) operator, proves that

(i) for the Hilbert space can be selected to be a lowest-weight representation with bosonic lowest-weight

(ii) for the Hilbert space can be selected to be a lowest-weight representation with fermionic lowest-weight

(iii) in the range an alternative choice for the Hilbert space consists in selecting it to be the direct sum of the two (the bosonic and the fermionic) lowest-weight representations

At the appearance in the r.h.s. of (57) of the Klein operator implies that (an infinite tower of) new generators must be introduced to close a Lie algebra. Indeed, for , we have , so that , , and so on.

We can now introduce the associative algebra of Weyl ordered (Hermitian) monomials (the ’s denote the members of the permutation group acting on elements), together with their product with the Klein operator . We have, at a fixed value ,The associative algebra defines the universal enveloping algebra of the deformed Heisenberg algebra (57). This algebra was first introduced in [6] in the context of the quantization of observables on a hyperboloid.

As a vector space can be endowed with either of two different types of brackets:

(i) ordinary brackets realized by commutators

(ii) -graded brackets realized by (anti) commutators

In the first case is an infinite-dimensional Lie algebra (the Jacobi identities being satisfied by construction) that we will denote as :The infinite-dimensional Lie algebra is another realization of the deformed Schrödinger algebra. Since the operators commute with the (19) matrix operator , by construction, is a dynamical symmetry of the Pure Calogero Matrix PDE; indeed we haveIn the second case is an infinite-dimensional Lie superalgebra satisfying the graded Jacobi identities and whose consistent -graded brackets, the (anti) commutators, are introduced through the positionThe -grading of the generators, , is determined by, respectively, the even or odd power of the ’s operators entering any given monomial (the presence of the Klein operator does not affect the -grading). We denote the superalgebra, with the given -graded brackets, asThis -dependent class of superalgebras was introduced in [6] and, together with a Lorentz invariant supertrace formula, was used in the construction of higher-spin Chern-Simons supergravity (see also [25]). In [6] these superalgebras were simply denoted as “”. We introduced here the “” label to distinguish them from the “”-labeled deformed Schrödinger algebras. We keep, however, the simplified notation when no confusion arises.

The infinite-dimensional, -dependent, superalgebra is a higher-spin superalgebra satisfying the correct spin-statistics connection. In order to understand its relation with higher-spin, two main features have to be recalled. The first one consists in the fact that contains the finite dimensional Lie superalgebra as subalgebra, so that ; the second feature is due to the fact that admits a covariant description in terms of three types of indices. They are the vector indices labeling a three-dimensional Minkowski space, the (Majorana) spinorial indices labeling the associated real -component spinors, and the scalar indices labeling an internal space.

In the covariant notation the fermions are expressed as , where one can setWe note that the ’s operators are Hermitian.

The even sector is expressed by the diagonal operators and (“” stands for the R-symmetry -generator) which can be recovered from the saturated (due to the presence of both spinorial and internal indices) generalized supersymmetry (see [26])The Charge Conjugation matrix and its inverse are used to raise/lower the spinorial indices; the diagonal metric and its inverse raise/lower the vector indices; the three gamma matrices satisfy the composition law of the split-quaternions given by , with the totally antisymmetric Levi-Civita pseudo-tensor normalized so that ; by definition . It is worth pointing out that the Charge Conjugation matrix and the gamma matrices act on the spinorial indices of the algebra and not on the -component wave function of the original PDE. The normalization of the antisymmetric tensor is .

Straightforward computations show that the matrix differential operators , are connected with the operators of formulas (30) and (32)-(34) through the positionsThe closure of the superalgebra is guaranteed by the nonvanishing commutatorsIn the last equation the matrix is given by .

We point out that the construction of the above superalgebra in terms of a Klein operator was discussed in [10]. Due to the presence of the covariant subalgebra, the remaining generators of are accommodated into higher-spin representations.

As mentioned before an associative algebra, called , of invariant operators for the DFF Matrix Calogero PDE is recovered from by applying the time redefinition (42) and the similarity transformation (43). From one recovers the deformed Schrödinger algebra and the higher-spin superalgebra . They are isomorphic realizations of and , respectively.

6. Conclusions

As we have seen, the Matrix Calogero models under consideration possess, in particular, a deformed Schrödinger algebra and the higher-spin superalgebra as dynamical symmetries. The deformed Schrödinger algebra is obtained by computing, similarly to [14], the class of linear operators which leave invariant the space of solutions of the given PDEs. A whole universal enveloping algebra, , is generated by requiring the closure of the Lie algebra induced by the commutators. When the Calogero potential coupling parameter takes the value, the infinite-dimensional algebra can be truncated to the standard Schrödinger algebra.

We further observed that the Matrix Calogero models and (at ) the free particle multiplet exhibit (relativistic) higher-spin symmetries. These results suggest that, extending the conjecture of [13], the nonrelativistic Calogero system studied so far may be dual, in a certain regime and in a certain asymptotic nonrelativistic geometry (see [27]), to the vacuum of the (bulk) Vasiliev’s higher-spin gravity. As a matter of fact, the -parameter is related to the vacuum expectation value of the scalar field in the Vasiliev-Prokuskin higher-spin gravity [28] in dimensions.

We should mention that another class of -dimensional nonrelativistic PDEs, unlike the Matrix Calogero models discussed here, inherently contain higher-spin operators [19, 29]. These PDEs are invariant under the centrally extended -Conformal Galilei algebras, with . In these models the higher-spin generators span a spin- representation of an subalgebra constructed from Heisenberg algebras ( for the free particle in one dimension). An open problem consists in understanding whether, for these systems, a deformation of the centrally extended -Conformal Galilei algebra, induced by Matrix Calogero potentials, is allowed.

We expect, more generally, that systems possessing conformal Galileo invariance could be related to higher-spin gravities. This type of nonrelativistic dualities, if they indeed exist, would complement the dualities conjectured in [30–32] (see also [33]).

Data Availability

No data were used to support this study.

Conflicts of Interest

The authors declare that they have no conflicts of interest.

Acknowledgments

Francesco Toppan received support from CNPq (PQ Grant no. 306333/2013-9). He thanks the Universidad San Sebastián of Valdivia, where this work was elaborated, for hospitality. Mauricio Valenzuela thanks as coinvestigator the projects Fondecyt Regular no. 1140296 and Conicyt DPI 20140115.

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Copyright © 2018 Francesco Toppan and Mauricio Valenzuela. 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.

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