Abbreviations
- Q :
-
Configuration space, with elements denoted byq ε Q.
- TQ :
-
State space. Points\((q,\dot q)\) are configurations and velocities.
- P = T*Q :
-
Phase space. Pointsz = (q, p) ε P are configurations and momenta.
- δz = (δq, 6p) :
-
Configuration-momentum variations; whereδq ε T qQ, andδp ε T *q Q.
- 〈·, ·> :
-
Non-degenerate duality pairing betweenT qQ andT *q Q.
- G :
-
Lie group acting freely onQ on the left. The action ofG onP is symplectic, obtained by cotangent lifts.
- :
-
Lie algebra ofG, with bracket denoted by [·, ·].
- * :
-
Dual of, with duality pairing denoted by a dot. Thusμ · η ε ℝ,.
- Adg :
-
Adjoint action ofG on;\(\left. {Ad_g \eta = \frac{d}{{d\varepsilon }}} \right|_{\varepsilon = 0} g(\exp (\varepsilon \eta ))g^{ - 1} \).
- \(Ad_{g^{ - 1} }^* \) :
-
Coadjoint action of G on;\((Ad_{g^{ - 1} }^* \mu ) \cdot \eta = \mu \cdot Ad_{g^{ - 1} } \eta \).
- adv :
-
Infinitesimal adjoint action of on;\(ad_v \eta = [\nu ,\eta ] = \left. {\frac{d}{{d\varepsilon }}} \right|_{\varepsilon = 0} Ad_{(exp(\varepsilon \nu ))} \eta \).
- ad *v :
-
Infinitesimal coadjoint action of on * (ad * v µ)·η=µ·ad v η.
- η Q(q):
-
Infinitesimal generator;\(\eta _Q (q) = \left. {\frac{d}{{d\varepsilon }}} \right|_{\varepsilon = 0} \exp (\varepsilon \eta ) \cdot q\).
- :
-
Momentum map;J(q, p) · η = 〈P,η Q(q)〉.
- V:Q → ℝ:
-
G-invariant potential energy.
- K:P → ℝ:
-
G-invariant invariant kinetic energy.
- H:P → ℝ:
-
Hamiltonian function:H(z)=V(q)+K(z).
- :
-
Energy-momentum functional:\(H_{\mu _e } (z,\xi ) = V(q) + K(z) - (J(z) - \mu _e ) \cdot \xi \).
- 〈·, ·〉g :
-
Positive-definite form onQ associated with the kinetic energy.
- FL:TQ →T *Q:
-
Legendre transformation; 〈FL(vq),w q〉=〈v q , wq〉g.
- :
-
Locked inertia tensor defined as.
- Σ:P →J −1(0):
-
Shifting map:Σ(q,p) ≔ (q,p - p J (q, P)), where.
- :
-
Augmented potential.
- :
-
Amended potential.
- \(h_{\mu _e } :\mathbb{J}^{ - 1} (\mathbb{O}) \to \mathbb{R}\) :
-
Reduced Hamiltonian:\(h_{\mu _e } (z) = V_{\mu _e } (q) + K(z)\).
- :
-
Isotropy subalgebra of under the coadjoint action.
- :
-
Orthogonal complement to with respect to at a givenq e ε Q.
- :
-
Space of admissible configuration variations modulo variations generated by. Thus,\(\delta q \in T_{q_e } Q\) is in if and only if 〈δq,η Q(qe)〉g=0 for all η∈.
- :
-
Space of ‘rigid’ configuration variations.
- ident ξ :
-
(Minus) linearized ‘angular’ momentum in the directionξ∈ for fixed locked velocity, i.e., ident ξ (δq):=-[Dj(q e ·δq]ηξ.
- :
-
Space of ‘internal’ configuration variations.
- :
-
Space of admissible configuration-momentum variations modulo variations generated by. The variation\(\delta z = (\delta q,\delta p) \in T_{z_e } P\) is an element of if and only if\(T_{z_e } J \cdot \delta z = 0\) andδq∈.
- D :
-
Vector tangent map; given a mapφ:M →V from a manifoldM to a vector spaceV, Dφ(q):T qM → V is given by\(D\phi (q) \cdot \delta q = \left. {\frac{d}{{d\varepsilon }}} \right|_{\varepsilon = 0} \phi (q_\varepsilon )\) for any curveq ε tangent toδq atq.
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Simo, J.C., Lewis, D. & Marsden, J.E. Stability of relative equilibria. Part I: The reduced energy-momentum method. Arch. Rational Mech. Anal. 115, 15–59 (1991). https://doi.org/10.1007/BF01881678
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DOI: https://doi.org/10.1007/BF01881678