Physics Letters B 790 (2019) 191–196
Contents lists available at ScienceDirect
Physics Letters B
www.elsevier.com/locate/physletb
Supersymmetric many-body Euler–Calogero–Moser model
Sergey Krivonos
a,b
, Olaf Lechtenfeld
c,∗
, Anton Sutulin
a
a
Bogoliubov Laboratory of Theoretical Physics, JINR, 141980 Dubna, Russia
b
St. Petersburg Department of V.A. Steklov Institute of Mathematics of the Russian Academy of Sciences, 27 Fontanka, St. Petersburg, Russia
c
Institut für Theoretische Physik and Riemann Center for Geometry and Physics, Leibniz Universität Hannover, Appelstrasse 2, D-30167 Hannover, Germany
a r t i c l e i n f o a b s t r a c t
Article history:
Received
13 December 2018
Received
in revised form 10 January 2019
Accepted
11 January 2019
Available
online 18 January 2019
Editor:
M. Cveti
ˇ
c
Keywords:
Spin-Calogero
models
N -extended supersymmetry
Euler–Calogero–Moser
system
We explicitly construct a supersymmetric so(n) spin-Calogero model with an arbitrary even number
N of supersymmetries. It features
1
2
N n(n + 1) rather than N n fermionic coordinates and a very
simple structure of the supercharges and the Hamiltonian. The latter, together with additional conserved
currents, form an osp(N |2) superalgebra. We provide a superspace description for the simplest case,
namely N = 2 supersymmetry. The reduction to an N -extended supersymmetric goldfish model is also
discussed.
© 2019 Published by Elsevier B.V. This is an open access article under the CC BY license
(http://creativecommons.org/licenses/by/4.0/). Funded by SCOAP
3
.
1. Introduction
In recent years notable progress was achieved in the super-
symmetrization
of the bosonic matrix models [1–6]. It has been
known for a long time that matrix models are an efficient tool of
constructing conformally invariant systems (see e.g. [7] and refs.
therein) For example, the Calogero model as well as its differ-
ent
extensions [8–12]are closely related to matrix models and
can be obtained from them by a reduction procedure. The super-
symmetrization
of matrix models consists in replacing the bosonic
matrix entries by superfields [1–5]. While this approach has been
quite successful for N ≤ 4extended supersymmetry, it seems to
be less efficient or even inapplicable for N > 4 supersymmetric
cases.
1
In contrast, the Hamiltonian approach has no serious re-
striction
on the number of supersymmetries, due to the absence of
auxiliary components.
The
key feature of a supersymmetric extension of one-dimen-
sional
models within the Hamiltonian approach is the appear-
ance
of additional fermionic matrix degrees of freedom accom-
panying
the standard N n fermions customarily required for an
N -extended supersymmetric system with n bosonic coordinates.
Recently we implemented this feature to construct a supersym-
*
Corresponding author.
E-mail
addresses: krivonos@theor.jinr.ru (S. Krivonos),
lechtenf@itp.uni-hannover.de (O. Lechtenfeld), sutulin@theor.jinr.ru (A. Sutulin).
1
An up to now unique example of a matrix system with N = 8 supersymmetry
has appeared in [5]in N = 4 superspace.
metric extension of Hermitian matrix models which admits an
arbitrary number of supersymmetries [6]. We also provided a su-
persymmetrization
of the reduction procedure which yields an
N -extended n-particle supersymmetric Calogero model. The ques-
tion
we address in this paper is how to (if possible) repeat
this supersymmetrization procedure for the real symmetric matrix
model [8].
In
the bosonic case, the free matrix model associated with real
symmetric matrices (see e.g. [11]) results in a spin generalization
of the n-particle Calogero–Moser model, which is also known as
the Euler–Calogero–Moser (ECM) model [8,9] and described by the
Hamiltonian
H =
1
2
n
i=1
p
2
i
+
1
2
n
i=j
2
ij
x
i
−x
j
2
. (1.1)
It depends on the coordinates x
i
(t) and momenta p
i
(t) of each
particle as well as on the internal degrees of freedom encoded in
the angular momenta
ij
=−
ji
. The coordinates and momenta
satisfy the standard Poisson brackets
x
i
, p
j
=δ
ij
, (1.2)
while the Poisson brackets of the angular momenta form the so(n)
algebra
ij
,
km
=
1
2
δ
ik
jm
+δ
jm
ik
−δ
jk
im
−δ
im
jk
.
(1.3)
https://doi.org/10.1016/j.physletb.2019.01.018
0370-2693/
© 2019 Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). Funded by SCOAP
3
.