tens~triangular ge...2021/04/26 · by greco marina ri 119781 and ragusa ¢ 1980 £ h six £ =free...
TRANSCRIPT
Prime t h i c k subcategories a n d s p e c t r a of d e r i v e d a n d singularity categories
of Noe t h e r i a n s c h eme s
Hi rok i M a t s u i (Univ. of Tokyo)
§ 1 I n t roduc t ion .
Tens~Triangular_Ge.my (Balmer 2005)
(T.
!
. I ) itensortriangulatedcateg.org(め -△)
def⇐ > ・ T : t r iavg.cat.
a
!
i T X T - ) J : e x a c t fune t
uM . N) 1 -)
MSN . IT : u n i t object
satisfying
( I LのM)のN E LD(MAN), M O N E N
"
M ,
I の M E M , い
e.g.ee.(D'が(X),
!
I , O x )fo r a N o e t h s c h .
"
d e r i v e d C a r . A perfect complexes o n X .
・ ([email protected]) f o r a finite group a n d a f ield た_ 、 一
S I TT h e s t r u c t u r e o f T i s c o n t r o l l e d by primidealse.AT .
t h i c k s u b c a t P C T satisfying
( idea l ) M G O . N E T ⇒ M の N E O
(prime) M
!
N
E D ⇒ M E A N E P .
B a l m e r d e f i n e d a topology o n .
Spec。(J) - 1prime i d e a s of T I : t h e B a l m e r spectrumof
T . - M I M Rjが(G:た)ヨ o r d e r i s o m . がた ×
{radical i d e a l s of T | E {Tmtasonsues o fSpec,(T))
a specialization_ c l o s e d s u b s e t s .
M o r e o v e r , Specs(J) i s uniquely d e t e rm i n e d by t h i s c o n d i t i o n .
usingNY・
Spec.(DMX)) E X
s Spec。(make,ER, M a e," " " " " " " Hopkins-Neeman_Thomason .
- い - Benson-Carlson-Rickard,Benson_Iyengar K r a u s e
n o Specs(T) has S o m e geometric i n fo rm a t i o n .
R o tT e n s o r t r i avg.geo m doesn't w o r k f o r t r iavg.cat wi thou t が S t r .
e.g. . Db(x):= が(cshX )
A.が8(x):=叭かGmt(x,
Deve lop "tensor.free" triangulated geometry.
e. I n t r o d u c e prinethieksubcategaies.ee a n d t h e spec t rum of t r iavg.cat.. S t u d y t h e m f o r
DPで(X), D'(X). DTX) of a N o e th . S c h e m e .
1 5 . 0 5
§ 2 P r i m e t h i c k subcategories a n d spectra
T : t r ia v g . c a t . (later Thx). Db(X). DMX))'
日が主mthicksubcatega_y.tt i s a t h i c k s u bc a t . P S t .
ヨunique m i n i m a l t h i c k s u bc a t . A w i t h P G K C ?
Spec」(T) i =1prime t h i c k s u b c a r . o f T f .
R t
For a
"
- △ c a t . J a n d a r a d i c a l i d e a l P,
P : prime ← ヨunique m i n i m a l r a d i c a l i dea l I with P E I C T .
I ⇒ h o l d s i f Spee。(T) i s Noah.)
に舌: c o m i n . N oe t h . r ing , p E Spee R
⇒ f ( p , i = f M E DPMR) / Mp E O i nD'"は(RP)) E SpeedA T R))
に)By H - N , ヨo rd e r i s o m f I t s 品.SmhM)
n
{thick s u b c a t . A DMTRY E fsp. d . s u b s e t s o f Spee R I
U V i N o
H I S ( p ) G t I E f W I f g e SpecR 184P IG I NI -U
Suppi ' l lNoしなり く ー > w。vfplun ique minimal unique min ima l sp.cl . Subset?Noth ick s u b c a t Z S(P)
/
D e fT e def ine a t o p . o n Speed?) v i a a c l o s e d b a s i s consisting of
Supp。(M) :=10 E SpeedT ) I M G Th (MET )
I N C SpeedT) : closedく⇒ W =?nSupp。(MxI AM ET) W e get t h e t o p o n
Spec , IT ) by replacingI N e c a l l SpeedT ) t h e s p e c t r um of T、 △ w i t h i n t h i s d e t .
I IW e s a y t h a t H e T i s aradidthicksut.cat・Ft
: - へ PK C P G SpeedT )
血(MT)ヨ o rd e r _ i s o n
f rad ica l t h i c k s u bc a t . A T I E f u n i o n s of Supp。(M) (MET) I
型 (rough statement)T : t r iang c a t .
I f a N o e t h s o b e r space X (e.g. underlying top. s p of N o eth . sch.) classif ies t h i c k s u bca t .:
i . e . ヨ o r d e r . i s o m .
I t h i c k s u bc a t . o f THE ftp.d. s u b s e t s o f X I ,
t h e n
X E SpeedT).
I
X ? N o e t h quasi-affine scheme
い) T h e n X E Spe」(DPが(X))
(2) Assume U x . s e i s hypersurface fo r Hn E X .
Then Sing(X) E Speed D'8(X))
(proof,「Thomason(1997))
I i d e a l s of DPMx)) E fsp.d. s u b s e t s of x)(Stevenson (2014)) Assume Qx . n i s h s . やaEX)
{ぱりX)- s u bm o d u l e s 昈(X) | E{sp.ee subse ts A Sing(X)/
X : quasi-off ⇒ がりx) - t h i c k U x
⇒ . H t h i c k s u b c a t . of DP"(X) a r e i d e a l s
・ H」、, _ D
!
(x ) a r e DPMX) . s u bmodu les H
§3 . Pr ime t h i c k s u b c a t . G s p e c t r a fo r DPMx),D'(X), DMX).
X : N o e t h . scheme.
F e ( B a l m e r )
All P r im e i d e a l s A DPA(X) a r e of t h e form
がた) :={MET h x , I M a E O i n Dmt(Ox,a) 1
条 E f perf, b , sg 1. ,a E X
When i s
が(n) i = f M E が(か I M a E O i n が 1 0 x .がa prime t h i c k s u b c a t . o f D'(X) ?
S t i r s① R e d u c e t o a f f i ne c a s e X・SpecR . P E SpecR
② Lo c a l i z e a t p
③ Study when O i s a prime f o r X - SpeeR u i t h a N oe t h local ring R
1 つ 學T : t r i avg.cat., K C J i t h i c k s u bc a t . 、 F ' J - ) T kFor K c T k i t h i c k , s e t
だ(ま) i = fM E T / F M ) E K I c T ! t h i c k .
T h e n
A C T K i primeく⇒ F'(K) C T : p r i m eR T RaI n part、, Zdmm
a F : S p e e dた)に Speed?) ⇒に:
!
..した)=
!
't
R
U
a t e . F t
w t h imageI P E SpeedT ) I K e p t .
① Redu c e t o af f ine c a s e .
Prop 3 ( x : sep i f ・ ・ s g )U C - x i a f f . s e p e n , Z s X \ U .
S e t
DE (X) は f M ED"(X) I M n E o ( H r E U ) fT h e n
D"石を(x) EDTし)
⑨ a spent. : B a l m e r (2002), T h o m a s o n T o baugh 11990)
@ * - b : Schl i ch ting 12008), Keller(1999)にユリヒティング)
⑤ め ーな i M a y b e wel l -known t o e x p e r t , Orlov(2004) fo r Z c Reg(X)
(rough sketch) Krause(2005) i n t roduced SIX) : the s tab le der ived Cat . AQ G h X .
s t .
|・ S I X ) i s Compactly gen. w i t h
S (X) ' EDS8(x)
' S"YSz ( x , E S ( U )
N e eman.Thomason
- たがいが'_は 昈(か1時(x,E プル) /
(一)C
② Lo c a l i z e a t s e
R IR i a m i n N O eth . ring , p E SpeeR
⇒ D'(Ryan E D T Rp)(Sketch)
⑤ HM.NET(R)Hompap,(MN)p E Homily,(MP.Np)
~ゝ○ M R Yip, → ぱ(Rr) : fully faithful
' general fact for a n R t i n t r iavg .cat . :
l o c a l i z e a t p = v e r d i e r qwt.by 日ftp.)Cf.
⑨ e s s . surf ? check directly. : fo r P E M P A Rp). c o n s t r u c t F E Kb(priR I s t . P E Pm e b m s g
型 (* - pet)X : N oe t h . scheme., a E X
t h f Min) CDPで(X) i prime t h i c k s u bc a t .
(probHB y Prop 2~ 4,
E I
R : u m m . N o e t h l oca l r ing.
O s S ( m ) e Dat(R) ! prime
に)By E x i n S 2 . y
地 ( * - b )X ? N o e t h . s c h e m e . n C X .
T h e n
f i n ) LDb(X) : pr ime O x . n i amplet o i n t e r s e c t i o n
(proofA s above,区点
u m m . N oeth . local ring.
○ C が(R) :primeく⇒ R i c .で、
い)U s e [Dwyer-Greenlees-Iyengar(2005), PoH i t z
12019))
R i c . i .
!
O F Hz CBR) : thick, も n DMR) キ O Y
型 や 一 s g ,X : sep . N oeth. s c h . n E Sing(X)T h e n .
f9、, c D'(X) :prime ← 0 x . s e i h s .
⇒ ho lds i f O x . n i s e i
(proofA s a b ove
E .、昔asm m . N oeth local ring. , n o w neg.
OCD"(R) e R i h s .
⇒ ho lds i t R i e . i
(に)cone昈(R)
U s e [Takahash i (2020))i
R : h . s . ⇒(へ A n o n - z e r o t h i c k sube a t . o f
D'(R)) F O
E ho lds i f R i s e . i .
un ique
○ i prime や c o r e D'IR) : min ima l th ick s e . O F oneが(R) /
Fo r a N oe t h . scheme X .
| Openi t
x i e x c . -:= f n f X | O x , n i c . i . I C Xby G r e c o Mar inar i 119781
a n d Ragusa(1980)H S I X) :=free Sing(X) 10x,、 i h s . l i C Sing(X)
C o rT : N o e t h s c h eme
ヨ imm. o f top. sp.
い) X L s SpeedDPMx))
(2) C I LX ) l e t SpeedDb(X))
13) HS (X ) h t Speed昈(X)) ( i f X : sep.)
S4 . Re la t ion wi th Ba lmer spectra.
IT!
"
- △ - c a t , P : r a d i c a l i dea l .
P : prime t h i c k s u bc a t . ⇒ P i prime Ud e a l
I n part., subsp.
Spec。(T) へ{radical i dea ls of Tf c Spec.(T)
C o rT : N seth . s e n . P C DPMX) : i d e a l . は ideal a r e radical)
P : pr ime t h i c k s u bcat. P こprime i d e a l .I n part.,
SpeedDPMX)) o f ideals o f Dmt州 = Spey(DMX))つ は T h i n 5
E
k i f i e ld . D':pri l i n e /た . N o t e i が例 E D P at(P),が(D)=of t h i c k O l i) / i f Zし
Then ヨ o r d e r _ i s o m
t t h i c k s u bc a t . o f Dmt例)Ef i l l」で"
①
#
一
中 #您品s
EEET""側Speed
DMP'))EmP i 」 z
f8 d i s c r e t e t o p . s p
n o t compact
h o t spectral space