, 0 = U 1 (g) U 0 (g) U 1 (g)..., U(g) = p U p (g) U p (g)u q (g) U p+q (g), [U p (g), U q (g)] U p+q 1 (g). U(g) PBW,. Associated graded algebra gr U
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1 W ( ) 1. ( )W Kac-Moody Virasoro,,,,, 4, Langlands.,, W., W, W ([A1, A2, A3, A7]). Premet[Pre] W ( )W, Kostant[Kos]. W Slodowy, primitive ideal. Premet Losev[Los2]. primitive ideal. W. ( )W Losev. Kac-Moody ĝ ( primitive ideal, primitive ideal Kac-Moody kλ 0 (k ) g., Kac-Moody ĝ ĝ ĝ g (Feigin-Frenkel [A5]). ĝ [A4] g,, ([A5])., Kac-Moody [A6], Losev, Kac-Moody W, 20 W [FKW] ([A7]).. 2. g, U(g) g : U(g) = T (g)/ x y x x [x, y] x, y g., T (g) g., g ( )U(g). U p (g) := ( p g ) U(g)
2 , 0 = U 1 (g) U 0 (g) U 1 (g)..., U(g) = p U p (g) U p (g)u q (g) U p+q (g), [U p (g), U q (g)] U p+q 1 (g). U(g) PBW,. Associated graded algebra gr U(g) = p U p (g)/u p 1 (g) Poisson. σ p (a)σ q (b) = σ ab, {σ p (a), σ q (b)} = σ p+q 1 ([a, b])., σ p : U p (g) U p (g)/u p 1 (g) (symbol map). 2.1 (Poincaré-Birkoff-Witt).. gr U(g) = S(g) = C[g ]., g Kirillov-Kostant Poisson ( x, y g C[g ] {x, y} = [x, y]). Z(g) U(g), Z p (g) = Z(g) U p (g) Z(g), gr Z(g) = p Z p(g)/z p 1 (g) gr U(g) = C[g ] Poisson., gr Z(g) = C[g ] G. Lie G = g. I U(g), I p = I U p (g) associated graded gr I = p I p/i p 1 C[g ] C[g ] G. Var(I) := {λ g f(λ) = 0, f gr I} I. Var(I) g G,. I U(g) primitive ideal, M 1. Shur, M γ : Z(g) C, (1) z χ(z) I = Ann U(g) M, z Z(g). N g. N =: {x g (ad x) r = 0, r 0} g. g g g ( ), N = {λ g p(λ) = 0, p C[g ] G +} g (Duflo 77). primitigve ideal.
3 . C[g ] G + C[g ] G argumentation ideal. C[g ] = C[p 1,..., p l ], deg p i > 0, C[g ] G + = l i=1 C[g ]p i.) (1), primitive ideal I 2. Var(I) N 2.3 (Joseph[Jos]). U(g) primitive ideal I., 3 O. Var(I) = O 3. W f N. Jacobson-Morozov f sl 2 {e, f, h} : [h, e] = 2e, [h, f] = 2f, [e, f] = h. f g Slodowy S f := f + g e g = g. S f g G ([GG]). γ : C G, t γ t, h g G 1, C t : x t 2 Ad(γt 1 )(x) S f C. C f. S f. χ g x (f x)., g., g = j Z g j, g j = {x g ad h(x) = jx} g 1 g 1 C (x, y) χ([x, y]). g 1 l, m = l j 2 g j g, m g., χ m (, χ([m, m]) = 0) M m G µ : g m M, χ m M. µ 1 (χ) = χ + m S f, S f. 2, U(g). 3 O = Ad G.x, x N ( )G.
4 3.1 ([Kos, GG]). (i) χ µ. (ii). M S f µ 1 (χ), (g, x) Ad g.x. 3.1 S f = µ 1 (χ)/m. S f ([Kos, Pre]). BRST ([KS]). Cl m m m, deg m = 1, deg m = 1 : Cl m = p Z Clp m. Cl m Cl m,p = Λ p (m)λ (m ) gr Cl m = p Cl m,p/cl m,p 1.., gr Cl m = Λ(m) Λ(m ) {x, y} = 0 {f, g} = 0 {f, x} = f(x) (x, y m, f, g m ). U(g) Cl m, Lie. θ : m U(m) Cl 0 U(g) Cl m, ad : m Cl 0 m Lie ([KS, Akm, BD] x x ad(x) (i) x m [Q, 1 x] = θ(x) + χ(x) U(g) Cl 1 m Q. (ii) Q Q 2 = 0., Q. m {x i }, {x i }, {c k ij } Q = (x i + χ(x i )) x i 1 1 (2) c k 2 ijx i x j x k. i Q odd Q 2 = 0 (ad Q) 2 = 0. (C (g), ad Q) dga(differential graded algebra). i,j,k H f (U(g)) := H (U(g) Cl m, ad Q). U(g) Cl m F p (U(g) Cl m ) = i+j p U i(g) Cl m,j associated graded gr F (U(g) Cl m ) = gr U(g) gr Cl m = C[g ] gr Cl m 4 m.
5 . Q (F 1 U(g) Cl m) gr F (U(g) Cl m ) = C[g ] gr Cl m Q (ad Q) 2 = 0. (C[g ] gr Cl m, ad Q) dgpa(differential graded Poisson algebra). ( ). 3.3 ([KS]). i Z H i (C[g ] gr Cl m, ad Q) = 0,. H 0 (C[g ] gr Cl m, ad Q) = C[S f ] 3.4 ([Kos, Pre, GG]). H i 0 f (U(g)) = 0 and gr Hf 0(U(g)) = C[S f ]. gr Hf 0(U(g)) U(g) Cl m H f (U(g)) associated graded. S f (3) U(g, f) := H 0 f (U(g)) (g, f) W 5. W, ([A2, DSK, BGK]) g = gl N. (gl N. ) f = f prin := f = F prin., N = Ad G.f prin y 1 y 2 y 3 y N 1 y 1 y 2... y N 1 S f = 0 1 y 1... y N 2 y ,..., y N C y 1, C[S f ] C[g ] GL N = C[h ] S N Chevalley. h g Cartan. (4) U(g, f prin ). Z(g) = S(h) S N, Kostant Whitttaker [Kos] Harish-Chandra 5 U(g, f) l.
6 W. (cf. [A2, A7]) U(g) Harish-Chandra HC : HC = {g U(g) }. M HC M Cl m U(g) Cl m, ad Q. H f (M) = H0 (M Cl m, ad Q) U(g, f), (5). HC { U(g, f) }, M H 0 f (M), 3.6 ([Los2, Gin]). M HC H i 0 f (M) = 0. (5). I U(g) I U(g)/I HC H 0 f (I) U(g, f) H 0 f (U(g)/I) 0. Hf 0 (I) (graded ). U(g, f) J associated variety Var(J) S f, Hf 0 (I) graded Var(Hf 0(I)) S f C. 3.7 ([Los1], [Gin]). U(g) I. Var(H 0 f (I)) = Var(I) S f I U(g) primitive ideal, O Var(I) = O g. (i) Hf 0 (U(g)/I) 0 Ad G.f O. (ii) Hf 0 (U(g)/I) ( ) ( ) f O. Hf 0(U(g)/I) U(g, f), H0 f (U(g)/I) U(g, f). 3.9 ([Los2]). I U(g) primitive ideal, O Var(I) = O g, f O, Hf 0 (U(g)/I). U(g, f). 4. ĝ g Kac-Moody. ĝ = g C[t, t 1 ] CK. [xt m, yt n ] = [x, y]t m+n + (x y)δ m+n,0 K, [K, ĝ] = 0 (x, y g). g (θ, θ) = 2. θ g. k C V k (g) := U(ĝ) U(g[t] CK) C k
7 ., C k g[t], K k g[t] CK. V k (g), V k (g) = k ĝ ([Kac, FBZ] ). ĝ M ĝ k K k, x g, m M xt r m = 0 r. V k (g) g k. N k (g) V k (g), N k (g) V k (g). L k (g) = V k (g)/n k (g). L k (g) L k (g) -Mod V k (g) V k (g) -Mod(= k ĝ ). L k (g)-mod = {M V k (g)-mod a (n) M = 0 a N k (g), n Z}, V V -Mod V, V (End M)[[z, z 1 ]], a a(z) = n Z a (n) z n 1 V M. L k (g)-mod., k, L k (g)-mod ĝ k. V k (g), L k (g) deg xt n = n. Zhu[FZ] { } {C }, V A(V ),,. {Z 0 V } { A(V ) } M M top., M top M., A(V k (g)) = U(g) k, U(g) E V k (g) U(g) U(g[t] CK) E. V V A(V ) A(V ). L k (g) Zhu U(g) : A(L k (g)) = U(g)/I k I k. L k (g) (U(g) modulo ) I k U(g) primitive ideal. Primitive ideal J I k Var(J) Var(I k ), I k associated variety. A(V ),.
8 , V. Zhu[Zhu], R V := V/C 2 (V ), C 2 (V ) = {a ( 2) b a, b V }.. ā b = a ( 1) b, {ā, b} = a (0) b. R V Zhu C 2. V X V X V = Specm R V. V V k (g),, C 2 (V ) = g[t 1 ]t 2 V., C[g ] = S(g) = R V k (g), x xt 1 1 X V k (g) = g. X Lk (g) g G. X V V. 4.2 ([A4]).. (i) dim X V = 0, (ii) dim Spec(gr V ) = 0. gr V V associated graded vertex algebra 6. X V 0 C , C 2, ([ABD, H2, H1, Miy] ) (i) dim X Lk (g) = 0, (ii) L k (g). (iii) k Z 0., C 2 Kac-Moody. Zhu Zhu C ([ALY]). R V gr A(V ). gr A(V ) V A(V ) associated graded Poisson algebra. 6 Poisson vertex algebra, C.
9 (6) Var(I k ) X Lk (g). R Lk (g) gr A(L k (g)) 7,. 4.5 ([A7]). k Var(I k ) = X Lk (g). U(g) primitive associated variety, X Lk (g) N., k L k (g) = V k (g) X Lk (g) = g., 4.3 k Z 0 X Lk (g) = {0}. X Lk (g) N h g Cartan, ĥ = h CK ĝ Cartan. ĥ+ = h CΛ 0., Λ 0 (K) = 1, Λ 0 (h) = 0. re re ĝ, + ĝ. λ ĥ L(λ) λ ĝ. ĝ, L k (g) = L(kΛ 0 ). L(λ). (i) λ regular dominant., λ + ρ, α {0, 1, }, α re + ĝ. (ii) Q (λ) = Q re., Q (λ) λ integral root system: (λ) = {α re λ, α Z}., { } { }..,. (i) Weyl-Kac. (7) ch L(λ) = w c W (λ) re + ( 1) lλ(w) e w λ α b + (1 e α ) dim bg. α Ŵ (λ) re (λ) ĝ Ŵ. (ii) ch L(λ), SL 2 (Z) ( [KW1]). 2 ([GK]). ĝ., ( ) 8,. (, (. 7 g E8 k = 1, (vareity {0} ). 8 (7) c W (λ).
10 k L(kΛ 0 ).. (1) k Q (2) kλ 0 ĝ regular dominant. ([KW2]). { k + h = p q, (p, q) N, (p, q) = 1, p h (r, q) = 1, h (r, q) = r 1 g ADE, h, h ĝ Coxter Coxeter, r = 2 g BCF 3 g G 2. Feigin-Frenkel, g = sl 2 Feigin-Malikov [FM]. 4.6 ([A5]). k X Lk (g) N. (Joseph ). 4.7 ([A5]). k X Lk (g) k q N N., q N O q, q k X Lk (g) = O q. O q. { {x g (ad x) 2q = 0}, (q, r ) = 1, O q = {x g π θs (x) 2q/r = 0}, (q, r ) = r. θ s g, π θs θ s g. { (n) n (q n) 4.8. g = sl n (C), O q (q, q,..., q, s) n (0 s < n) (q < n) k Specm(gr L k (g)) = JO q. JX X [A7] k 4.5., q N k Var(I k ) = O q ( )W. Duflo, I k U(g) primitive ideal ([A6]). λ ĥ k(i.e. λ(k) = k) L(λ) L k (g) L(λ) (λ) = (kλ 0 ). 9 C X, JX C A Hom(Spec A, JX) = Hom(Spec A[[t]]], X) (cf. citeeinmus).
11 5. ( )W f N, W k (g, f) (g, f) k C W ([FF, KRW]). W k (g, f),. X Wk (g,f) = S f, gr W k (g, f) = C[JS f ] ([DSK, A5]). W k (g, f) W U(g, f) 10 ([[DSK, A2]]). A(W k (g, f)) = U(g, f) W k (g, f) Kac-Moody Virasoro. W k (g, 0) = V k (g), W k (sl 2, f) (k 2 ) 1 6(k+1) 2 /(k+2) Virasoro. W k (g, f) Drinfeld-Sokolov. BRST H f (?) W k (g, f) = H 0 f (V k (g)) ((3) ). W k (g, f) 11 W k (g, f). X WK (g,f) = S f X Wk (g,f) S f C., W k (g, f) C 2 X Wk (g,f) = {f} g = gl N, f = f prin. (4), U(g, f prin ) S(h) S N S(h). h Heisenberg. h ( κ = k + N 12 ) H κ. x i (z) = n Z x i,nz n 1 (i = 1,..., N), OPE x i (z)x j (w) κδ i,j (z w) 2 ( [x i,n, x j,m ] = κnδ n+m,0 δ i,j ). Harish-Chandra, W k (g, f prin ) H κ.. H κ W k (g, f prin ) W (1) (z), W (2) (z),..., W (N) (z) 10 W k (g, f) 1 2 Z 0-graded Zhu Ramond twisted Zhu. 11 k = h graded simple quotient 12 κ 0.
12 . N W (j) (z)(ν ) N j =: (ν z + x 1 (z))(ν z + x 1 (z))... (ν z + x N (z)) : j=0, z x i (z) = d dz x i(z) + x i (z) z, ν = κ 1 = k + N 1. W (r) (z) = : x i1 (z)x i2 (z)... x ir (z) : +lower i 1 <i 2 < <i r ([FL], [AM] )., W (r) )(z) OPE( ) closed formula ( ).,,. V k (g)-mod W k (g, f)-mod, M H 0 f (M) KL k ĝ k Harish-Chandra (ĝ, G[[t]]). KL k G[[t]], g[[t]] g[t] ĝ k ĝ. 5.2 ([A5]). k C, M KL k H i 0 f (M) = 0.. KL k W k (g, f)-mod, M H 0 f (M),, V k (g) L k (g) W k (g, f) = H 0 f (V k (g)) H 0 f (L k(g)). H 0 f (L k(g)) W k (g, f). W W k (g, f). 5.3 ([FKW, KRW]). H 0 f (L k(g)) W k (g, f). [A1, A2, A3]. 5.4 ([A5]). k C, f N. X H 0 f (L k (g)) = X L(kΛ0 ) S f H 0 f (L k(g)) 0 f X L(kΛ0 ) k q N, f O q. X H 0 f (L(kΛ 0 )) = {f}. H 0 f (L(kΛ 0)) C 2. W k (g, f) C W V V C 2, CFT. (i) ([Zhu], Dong-Lin-Ng]) {M 1,..., M r } V, v V k {q c v 24 tr Mi (o(v)q L 0 )} k., o(v) V v(z). (ii) ([H1]) V. Reshetikhin- Turaev 3.
13 O prin N G. k. X Lk (g) = O prin (= N ). q N k. { h ((q, r ) = 1 ), q r L h ((q, r ) = r ). 6.2 ([FKW]). k W k (g, f prin ) ( C 2 ). g = sl 2, W k (g, f prin ) Virasoro ([BPZ]). 6.2 Kac- [KW2]. O q ([A5]). 6.3 ([KW2]). k q N. W k (g, f). f O q. f Levi type. (q, r ) = 1., (A.). k q N. f O q W k (g, f) (i) ([A7]) 6.2. (ii) ([A8]) g = sl n, ). (iii) ([A8]) f ADE Kac- 6.4 (DE Levi type ). References [ABD] Toshiyuki Abe, Geoffrey Buhl, and Chongying Dong. Rationality, regularity, and C 2 - cofiniteness. Trans. Amer. Math. Soc., 356(8): (electronic), [Akm] Füsun Akman. A characterization of the differential in semi-infinite cohomology. J. Algebra, 162(1): , [ALY] Tomoyuki Arakawa, Ching Hung Lam, and Hiromichi Yamada. Zhu s algebra, C 2 -algebra and C 2 -cofiniteness of parafermion vertex operator algebras. Adv. Math., 264: , [AM] Tomoyuki Arakawa and Alexander Molev. Explicit generators in rectangular affine W -algebras o type A. arxiv: [math.rt]. [A1] Tomoyuk Arakawa. Representation theory of superconformal algebras and the Kac-Roan- Wakimoto conjecture. Duke Math. J., 130(3): , [A2] Tomoyuki Arakawa. Representation theory of W -algebras. Invent. Math., 169(2): , [A3] Tomoyuki Arakawa. Representation theory of W -algebras, II. In Exploring new structures and natural constructions in mathematical physics, volume 61 of Adv. Stud. Pure Math., pages Math. Soc. Japan, Tokyo, [A4] Tomoyuki Arakawa. A remark on the C 2 cofiniteness condition on vertex algebras. Math. Z., 270(1-2): , [A5] Tomoyuki Arakawa. Associated varieties of modules over Kac-Moody algebras and C 2 - cofiniteness of W-algebras v2.
14 [A6] T. Arakawa. Rationality of admissible affine vertex algebras in the category O. arxiv: [math.qa]. [A7] Tomoyuki Arakawa. Rationality of W-algebras; principal nilpotent cases. arxiv: [math.qa]. [A8] Tomoyuki Arakawa. in preparation. [BD] Alexander Beilinson and Vladimir Drinfeld. Quantization of hitchin s integrable system and hecke eigensheaves. preprint. [BGK] Jonathan Brundan, Simon M. Goodwin, and Alexander Kleshchev. Highest weight theory for finite W -algebras. Int. Math. Res. Not. IMRN, (15):Art. ID rnn051, 53, [BPZ] A. A. Belavin, A. M. Polyakov, and A. B. Zamolodchikov. Infinite conformal symmetry in two-dimensional quantum field theory. Nuclear Phys. B, 241(2): , [DSK] Alberto De Sole and Victor G. Kac. Finite vs affine W -algebras. Japan. J. Math., 1(1): , [FBZ] Edward Frenkel and David Ben-Zvi. Vertex algebras and algebraic curves, volume 88 of Mathematical Surveys and Monographs. American Mathematical Society, Providence, RI, second edition, [FF] Boris Feigin and Edward Frenkel. Quantization of the Drinfel d-sokolov reduction. Phys. Lett. B, 246(1-2):75 81, [FKW] Edward Frenkel, Victor Kac, and Minoru Wakimoto. Characters and fusion rules for W - algebras via quantized Drinfel d-sokolov reduction. Comm. Math. Phys., 147(2): , [FL] V. A. Fateev and S. L. Lykyanov. The models of two-dimensional conformal quantum field theory with Z n symmetry. Internat. J. Modern Phys. A, 3(2): , [FM] Boris Feigin and Fyodor Malikov. Modular functor and representation theory of sl b 2 at a rational level. In Operads: Proceedings of Renaissance Conferences (Hartford, CT/Luminy, 1995), volume 202 of Contemp. Math., pages , Providence, RI, Amer. Math. Soc. [FZ] Igor B. Frenkel and Yongchang Zhu. Vertex operator algebras associated to representations of affine and Virasoro algebras. Duke Math. J., 66(1): , [GG] Wee Liang Gan and Victor Ginzburg. Quantization of Slodowy slices. Int. Math. Res. Not., (5): , [Gin] Victor Ginzburg. Harish-Chandra bimodules for quantized Slodowy slices. Represent. Theory, 13: , [GK] Maria Gorelik and Victor Kac. On complete reducibility for infinite-dimensional Lie algebras. Adv. Math., 226(2): , [H1] Yi-Zhi Huang. Rigidity and modularity of vertex tensor categories. Commun. Contemp. Math., 10(suppl. 1): , [H2] Yi-Zhi Huang. Vertex operator algebras and the Verlinde conjecture. Commun. Contemp. Math., 10(1): , [Jos] Anthony Joseph. On the associated variety of a primitive ideal. J. Algebra, 93(2): , [Kac] Victor Kac. Vertex algebras for beginners, volume 10 of University Lecture Series. American Mathematical Society, Providence, RI, second edition, [Kos] Bertram Kostant. On Whittaker vectors and representation theory. Invent. Math., 48(2): , [KRW] Victor Kac, Shi-Shyr Roan, and Minoru Wakimoto. Quantum reduction for affine superalgebras. Comm. Math. Phys., 241(2-3): , [KS] Bertram Kostant and Shlomo Sternberg. Symplectic reduction, BRS cohomology, and infinite-dimensional Clifford algebras. Ann. Physics, 176(1):49 113, [KW1] V. G. Kac and M. Wakimoto. Classification of modular invariant representations of affine algebras. In Infinite-dimensional Lie algebras and groups (Luminy-Marseille, 1988), volume 7 of Adv. Ser. Math. Phys., pages World Sci. Publ., Teaneck, NJ, [KW2] Victor G. Kac and Minoru Wakimoto. On rationality of W -algebras. Transform. Groups, 13(3-4): , [Los1] Ian Losev. 1-dimensional representations and parabolic induction for w-algebras. preprint, arxiv:math/ [math.rt]. [Los2] Ivan Losev. Finite-dimensional representations of W -algebras. Duke Math. J., 159(1):99 143, 2011.
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