Physics Letters B 767 (2017) 99–102
Contents lists available at ScienceDirect
Physics Letters B
www.elsevier.com/locate/physletb
Generalized sigma model with dynamical antisymplectic potential
and non-Abelian de Rham’s differential
Igor A. Batalin
a,b
, Peter M. Lavrov
b,c,∗
a
P.N. Lebedev Physics Institute, Leninsky Prospect 53, 119991 Moscow, Russia
b
Tomsk State Pedagogical University, Kievskaya St. 60, 634061 Tomsk, Russia
c
National Research Tomsk State University, Lenin Av. 36, 634050 Tomsk, Russia
a r t i c l e i n f o a b s t r a c t
Article history:
Received
4 January 2017
Accepted
27 January 2017
Available
online 2 February 2017
Editor:
M. Cveti
ˇ
c
Keywords:
Sigma-model
De
Rham’s differential
Supermanifold
Superfield
Master
equation
For topological sigma models, we propose that their local Lagrangian density is allowed to depend non-
linearly
on the de Rham’s “velocities” DZ
A
. Then, by differentiating the Lagrangian density with respect to
the latter de Rham’s “velocities”, we define a “dynamical” anti-symplectic potential, in terms of which a
“dynamical” anti-symplectic metric is defined, as well. We define the local and the functional antibracket
via the dynamical anti-symplectic metric. Finally, we show that the generalized action of the sigma model
satisfies the functional master equation, as required.
© 2017 The Author(s). 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
When formulating a topological sigma model, one proceeds
usually with an anti-symplectic configuration space {Z
A
|ε(Z
A
) =:
ε
A
} whose anti-symplectic potential V
A
(Z), ε(V
A
) =: ε
A
+ 1, is
given originally [1–11]. At the same time, it is assumed usually
that the kinetic part of the original local Lagrangian density L has
the form −(DZ
A
)V
A
(Z), where D is the de Rham’s differential.
In
the present paper, we generalize the local original Lagrangian
density as to take the form L(Z, DZ) allowed to depend non-
linearly
on the de Rham’s “velocities” DZ
A
. Then, we define a
“dynamical” anti-symplectic potential, V
A
(Z, DZ) as the derivatives
of the new Lagrangian density with respect to the mentioned de
Rham’s “velocities”. We define a local anti-symplectic metric in its
covariant components E
AB
(Z, DZ) as the standard vorticity of the
“dynamical” anti-symplectic potential V
A
(Z, DZ), in terms of ex-
plicit
Z
A
-derivatives.
We
define both the local and the functional antibracket by
the standard formulae via the “dynamical” anti-symplectic met-
ric
in its contravariant components E
AB
(Z, DZ). Finally, we show
that the new action =:
dμL(Z , DZ) satisfies the functional
master equation, provided the function S(Z, DZ) =: L ( Z, DZ) +
DZ
A
V
A
(Z, DZ) satisfies the local master equation.
*
Corresponding author.
E-mail
addresses: batalin@lpi.ru (I.A. Batalin), lavrov@tspu.edu.ru (P.M. Lavrov).
2. Non-Abelian de Rham’s differential
Let be an intrinsic configuration super-manifold,
=: {X
a
, C
a
|ε(X
a
) = 0, ε(C
a
) = 1, a = 1,...,2m}. (2.1)
Let D be a non-Abelian de Rham’s differential, as defined by the
conditions
ε(D) = 1, D
2
=
1
2
[D, D]=0, D =−D
†
, (2.2)
whose solution is sought for in the form,
D =: C
a
b
a
(X)
∂
∂ X
b
+
1
2
C
b
C
a
U
d
ab
(X)
∂
∂C
d
, (2.3)
with
b
a
being invertible, and U
d
ab
being antisymmetric in its sub-
scripts
a , b [6]. The conditions (2.2) imply
c
a
∂
c
d
b
− (a ↔ b) = U
c
ab
d
c
, (2.4)
(−
e
a
∂
e
U
d
bc
+ U
e
ab
U
d
ec
) + cyclic perm.(a, b, c) = 0. (2.5)
The Jacobi relation (2.5) provides for the integrability of the
Maurer–Cartan equation (2.4). In terms of the Boson integration
measure,
dμ() =: ρ(X)[dX][dC ], ρ =: det (
−1
) = ( det ())
−1
, (2.6)
the anti-Hermiticity of the differential D implies
http://dx.doi.org/10.1016/j.physletb.2017.01.065
0370-2693/
© 2017 The Author(s). 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
.