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Hodge-Arakelov-theoretic Evaluation I

Yuichiro Hoshi

RIMS, Kyoto University

December 10, 2015

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Notation and Terminology

“∆”: the geometric portion of “Π”,

i.e., the kernel of the outer surjection from “Π” to the arithmetic quotient of “Π”

d(): the profinite completion of () For a topological groupG,

Hi(G, A)def= lim−→HG:open subgps of finite indexHi(H, A)

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§ 2 Galois-theoretic Theta Evaluation

In§2, §212, and §3: Fix a v Vbad.

Πv def= ΠtpX

v

func’l alg’m

ΠtpY¨

v

−−−→ ΠtpY

v −−−→ Πv = ΠtpX

v

y y y Πtp¨

Yv −−−→ ΠtpY

v −−−→ Π±v def= ΠtpX

v

y

Πcorv def= ΠtpCv MΘ = (MΘM)M: a projective system of mono-theta environments Fv: the tempered Frobenioid determined by X

v

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Goal: Θ

v

evaluation labeled by t qt2

v (t LabCusp± atv)

Problem 1 A conjugacy indeterminacy in a situation related to the theta value “qt2

v” at|t| ∈ |Fl|depends, a priori, on the label |t| ∈ |Fl|. That is to say, various objects at |t| ∈ |Fl|is well-defined up to conjugation which is, a priori, independent of the label|t| ∈ |Fl|. On the other hand, we want to establish a suitable Kummer theory for such theta values.

We have to synchronizes conjugacy indeterminacies in situations related to the theta values at various |t| ∈ |Fl|.

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Problem 2 By using the structure of a Hodge-theater, we synchronized globally the various “LabCusp±v” by means of — relative toD,v

through0

D⊚± (through 0D,w) — the var. bij.

{cuspidal inertia subgps ofπ1tp(X

v)}/Inn(π1tp(X

v))

→ { cuspidal inertia subgps of π1´et(XK)}/Inn(π´et1 (XK)).

Moreover, the crucial globalF⋊±l -symmetry arises from a profinite conjugation (cf. π´et1 (CF)/π1´et(XF) π1´et(CK)/π´et1(XK)=F⋊±l ).

We have to discuss the comparison between tempered conjugation and profinite conjugation.

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Γ(): the dual graph of the special fiber of ()v

Irr(): the set of irreducible components of the special fiber of ()v

Fix an inversion automorphism ιdef= ιY¨ of Y¨

v

⇒ιX,ιY¨, and Z Irr( ¨Y) (= Irr(Y)= Irr( ¨Y)= Irr(Y)), (Note: ι↷Irr ⇝ 1↷ Z)

a subgraph Γ() Γ() for ()∈ {X, X,Y ,¨ Y¨}, i.e.,

l

•−−−−−l•−− · · · −−+1 •−−−−−1 •−−−−−0 •−− · · · −−1 l•−−−−−1 l t∈LabCusp±v)

a subgraph Γ(−)t Γ() for ()∈ {X, X,Y ,¨ Y¨}, i.e.,

t •−−−−−l l•−− · · · −−+1 •−−−−−1 •−−−−−0 •−− · · · −−1 l•−−−−−1 l

def= “0” (i.e., for instance, Γ(−) def= Γ(−)0 )

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∈ {•t,▶}

Πv□ Πv: a decomposition subgroup ofΓX ΓX, i.e., “ΠtpX,Γ

X

” Π±v def= NΠ±

vv) Π±v Πv¨

def= ΠvΠtp¨

Yv

Πtp¨

Yv

Thus, for instance:

Π±vv Π±vv Gal(X

v/Xv) (=µl), Π±vΠv = Πvv : Πv¨] = 2, [Π±v : Πv] =l, ...

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Then:

Πv func’l

alg’mv Πv Πv, ι) well-defined up to Πv-conj.

(Recall: Πv func’l

alg’m θ(Πv)θ(Πv)H1tp¨

Yv),(l·Θ)(Πv))) Thus:

Πv func’l

alg’m θιv)⊆θ(Πv), θιv)θ(Πv): µ2l-, µ-torsors Moreover: Πv func’l

alg’m

(l·Θ)(Πv¨): the subquotient of Πv¨ det’d by (l·Θ)(Πv) ΠvGvv): the arithmetic quotient of Πv

Πv¨Gvv¨): the arithmetic quotient of Πv¨

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.Key Lemma (Comparison Between Temp’d Conj. and Prof. Conj.) ..

...

It Πv: an inertia subgp ass’d to the cusp lab’d by t s.t. It v γ,γ ∆b±v

Then the following three conditions are equivalent:

γ ±v It·γ) Πγv It·γ) ±v)γ where()γ def= γ·()·γ1

Key Lemma follows from the theory of semi-graphs of anabelioids.

In the situation of Key Lemma, write δdef= γ·γ ∆b±v. (Lemma Itδ =It·γ) Πγv = Πδv)

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By the theory of semi-graphs of anabelioids,

one can construct, from the inclusions Itδ =It·γ) Πγv = Πδv: (a) the dec. gpDδt def= NΠδv(Itδ)Πδv that contains Itδ

(b) a dec. gpDδµ Πδv¨, well-def’d up to (Π±v¨)δ-conj., ass’d to µ (c) a dec. gpDδt,µ Πδv¨, well-def’d up to (Π±v¨)δ-conj., ass’d to the µ-translation of the cusp that det. Itδ (i.e., an ev. pt lab’d by t) Moreover, this construction is compatible w/:

the ∆b±v-conjugation the inclusion ΠvtΠv If, moreover, □=•t, then the construction of (a) and (c) is compatible w/ theΠbcorv -conjugation.

(Recall: the F⋊±l -symmetry arises from theΠbcorv -conjugation.)

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. ...

Itδ =It·γ) Πδv¨ Πγv = Πδv

By restrictingθιγv)θιγv) to Πγv¨ Πtp¨

Yγv), we obtain µ2l-, µ-torsors

θιγv¨) θιγv¨) H1γv¨,(l·Θ)(Πγv¨)).

Thus, by restricting them to(Gvγv¨))Dδt,µ Πγv¨, we obtain θtγv¨) θtγv¨) H1(Gvγv¨),(l·Θ)(Πγv¨)), i.e., “µ2l·qt2

v µ·qt2

v ”, where −l ≤t ≤l is det’d by t.

(∞)θ|t|γv¨) def= (∞)θtγv¨) (= (∞)θtγv¨))

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In summary:

Πv func’l

alg’m |t|γv¨)}|t|∈|Fl|, {θ|t|γv¨)}|t|∈|Fl| arising from

Πγv¨: an arbitrary ∆b±v-conjugate of Πv¨

Itδ: an arbitrary ∆b±v-conjugate of It s.t. Itδ Πγv¨ (t ranges over the elements of LabCusp±γv)

γ-conj.

LabCusp±v)) Moreover, this alg’m is compatible w/ the independent conj. actions of ∆b±v on the sets of (not temp’d but) prof. conj. {Πγv¨}γ and {Itδ}δ.

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.Remark ..

...

A conjugacy indeterminacy in a situation related to the theta value

()θ|t|” at |t| ∈ |Fl| depends, a priori, on the label |t| ∈ |Fl|. That is to say, various objects at |t| ∈ |Fl|is well-defined up to conjugation which is, a priori, independent of the label|t| ∈ |Fl|. However, our resulting theta values

()θ|t|γv¨)H1(Gvγv¨),(l·Θ)(Πγv¨))

for various|t| ∈ |Fl| are computed relative to “label-independent”

Gvγv¨) and (l·Θ)(Πγv¨). conjugate synchronization ( One may apply Kummer theory related to theta values.)

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Recall: Πv func’l

alg’m MTM×v)(MTM× ·θι)(Πv)(MTM× ·θι)(Πv) in H1v,(l·Θ)(Πv))

(Recall: “MTM× ” is an isomorph of “O×F

v”.) By restricting them to Πγv¨ Πv, we obtain

MTM×γv¨)(MTM× ·θι)(Πγv¨)(MTM× ·θι)(Πγv¨) in H1γv¨,(l·Θ)(Πγv¨))

Thus, by the nat’l “θιγv¨)↠θ0γv¨)”, we obtain a splitting (MTM× ·θι)(Πγv¨)/MTMµγv¨) = MTM×µγv¨)×(

θιγv¨)/MTMµγv¨) )

. (Recall:“MTMµ ”(resp.“MTM×µ”) is an isomorph of “OµF

v”(resp.“OF×µ

v”).)

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In the remainder of§2, suppose: ΠtpX(MΘ) = Πv

1Πµ(MΘ)ΠMΘ ΠtpX(MΘ)

By base-chan’g Πv¨ Πv Πv = ΠtpX(MΘ)via ΠMΘ ΠtpX(MΘ), we obtain closed subgroupsΠMΘ

¨ ΠMΘ

∗▶ ΠMΘ

. Πµ(MΘ¨), (l·Θ)(MΘ¨),Πv¨(MΘ¨), Gv(MΘ¨):

the respective “corresponding subquotients” of ΠMΘ

¨

⇒ ∃a cyclotomic rigidity isomorphism (l·Θ)(MΘ¨) Πµ(MΘ¨)

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By applying the cycl. rig. isom. (l·Θ)((MΘ¨)γ) Πµ((MΘ¨)γ) arising from the “γ-conjugate” (MΘ)γ of MΘ (where γ ∆b±v) to

θιγv¨)θιγv¨)H1γv¨,(l·Θ)(Πγv¨)),

θ|t|γv¨)θ|t|γv¨)H1(Gvγv¨),(l·Θ)(Πγv¨)), and

(MTM× ·θι)(Πγv¨)/MTMµ γv¨) =MTM×µγv¨)×(θιγv¨)/MTMµ γv¨)),

we obtain

θιenv((MΘ¨)γ)θιenv((MΘ¨)γ)H1v¨((MΘ¨)γ),Πµ((MΘ¨)γ), θ|t|

env((MΘ¨)γ)θ|t|

env((MΘ¨)γ)H1(Gv((MΘ¨)γ),Πµ((MΘ¨)γ)), (MTM× ·θι

env)((MΘ¨)γ)/MTMµ ((MΘ¨)γ)

=MTM×µ((MΘ¨)γ)×(

θι

env((MΘ¨)γ)/MTMµ ((MΘ¨)γ) )

.

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In a similar vein, by applying the cycl. rig. isom.

(l·Θ)((MΘ¨)γ) µZb(Gv((MΘ¨)γ)), we obtain:

θι

bs((MΘ¨)γ)θι

bs((MΘ¨)γ)

H1v¨((MΘ¨)γ),µbZ(Gv((MΘ¨)γ))),

θ|t|

bs((MΘ¨)γ)θ|t|

bs((MΘ¨)γ)

H1(Gv((MΘ¨)γ),µbZ(Gv((MΘ¨)γ))),

(MTM× ·θιbs)((MΘ¨)γ)/MTMµ ((MΘ¨)γ)bs

=MTM×µ((MΘ¨)γ)bs×(

θιbs((MΘ¨)γ)/MTMµ ((MΘ¨)γ)bs

) .

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§ 2

12

Multiradial Kummer-detachment of Theta Monoids

Goal: “multiradial Kmm-detach.” of theta monoids, i.e., “OF×v ·Θ

v” Strategy: By the final assertion of §1, we have:

Πv multiradial

alg’m⇝ ´etale-like O×F

v·Θ

v via multiradial

cycl. rig.⇝ mono-theta O×F

v ·Θ

v , i.e., labeled by “env”

Thus, by applying the Kummer theory for theta functions:

Frobenius-like OF×

v ·Θ

v

Kummer theory⇝ (OF×

v·Θ

v)env

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Recall: Fv func’l

alg’m µ2l(T÷Y¨

v

)·Θ

v ⊆ O×(T÷Y¨

v

) (which determines the monoid OCΘ

v(AΘ) =O×CΘ

v(AΘ)·ΘN

v|AΘ) ΨFvΘ =

{

ΨFvΘdef= OC×Θ

v(AΘ)·α

v)N|AΘ

}

αAutDv( ¨Y

v)

ΨFvΘ = {

ΨFvΘdef= OC×Θ

v(AΘ)·α

v)Q≥0|AΘ

}

αAutDv( ¨Y

v)

Recall: Fv func’l

alg’m the base-theoretic hull Cv ⊆ Fv

v ↷) ΨCv def= OCv(AΘ)(well-defined up to Πv-conjugation) .

...

()ΨFvΘ: the Frobenius-like theta monoid ΨCv: the Frobenius-like constant monoid

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Recall: MΘ func’l

alg’m MTM× (MΘ), θ

env(MΘ)θ

env(MΘ) in H1tp¨

Y (MΘ),Πµ(MΘ)) Ψenv(MΘ)def=

{

Ψιenv(MΘ)def= MTM× (MΘ)·θι

env(MΘ)N }

ι:inv. autom.

Ψenv(MΘ)def= {

Ψιenv(MΘ)def= MTM× (MΘ)·θι

env(MΘ)Q0 }

ι:inv. aut.

Recall: MΘ func’l

alg’m Gv(MΘ), µbZ(Gv(MΘ)) Πµ(MΘ)

func’l

alg’m MTM(MΘ)H1tp¨

Y(MΘ),Πµ(MΘ)) (Recall: “MTM” is an isomorph of “OF

v”.) (ΠtpX(MΘ)↷) Ψcns(MΘ)def= MTM(MΘ) .

...

()Ψenv(MΘ): the mono-theta-theoretic theta monoid Ψcns(MΘ): the mono-theta-theoretic constant monoid

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In particular, by applying the above algorithm toMΘv):

. ...

()Ψenv(MΘv)): the ´etale-like theta monoid Ψcns(MΘv)): the ´etale-like constant monoid

In order to obtain “multiradial Kummer-detachment” of “Θ

v”, let us relate

Frobenius-like/mono-theta-theoretic/´etale-like theta monoids.

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In the remainder of§212, suppose: MΘ(Fv) = MΘ

Then, by applying the Kummer theory, relative to a suitable assign’t

“ι 7→α”, we obtain an isomorphism ()ΨFΘ v

()Ψιenv(MΘ)

(cf. the Kummer theory of theta functions in tempered Frobenioids).

Write

()ΨFvΘ −→ ()Ψenv(MΘ) for the collection of the above isomorphisms.

Moreover, again by applying the Kummer theory, we obtain an isomorphism

ΨCv −→ Ψcns(MΘ).

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Thus, every isomorphism MΘv) MΘ =MΘ(Fv) determines:

(´etale) (mono-theta) (Frobenius) Πv = ΠtpX(MΘv)) ΠtpX(MΘ) = ΠtpX(MΘ)

↷ ↷ ↷

Ψenv(MΘv)) Ψenv(MΘ) ΨFΘ v

Ψenv(MΘv)) Ψenv(MΘ) ΨFΘ v

Gv =Gv(MΘv)) Gv(MΘ) = Gv(MΘ)

↷ ↷ ↷

Ψenv(MΘv))× Ψenv(MΘ)× Ψ×FΘ v

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Moreover, every isom. MΘv) MΘ =MΘ(Fv) also determines:

(´etale) (mono-theta) (Frobenius) Πv = ΠtpX(MΘv)) ΠtpX(MΘ) = ΠtpX(MΘ)

↷ ↷ ↷

Ψcns(MΘv)) Ψcns(MΘ) ΨCv

Gv =Gv(MΘv)) Gv(MΘ) = Gv(MΘ)

↷ ↷ ↷

Ψcns(MΘv))× Ψcns(MΘ)× Ψ×Cv That is to say, we obtain various Kummer isomorphisms.

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Thus, by the final assertion of§1, we obtain

“multiradial Kummer-detachment” of theta monoids:

Πv multiradial

alg’m (cf.§1)()Ψenv(MΘv))

via multiradial

cycl. rig. ()ΨFΘ v

.Remark ..

...

On the other hand, the above discussion only gives

“uniradial Kummer-detachment” of constant monoids.

(cf. “(Πv ↷ΨCv)⇝(Gv(MΘ)↷Ψ×C

v)”: a uniradial environment) (the theory of log-shells)

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§ 2

34

Definition (used in § 4)

(1) v Vnon ⇒ Fv⊢×: the Fro’d “corresponding to”GvO×F

v

(omit the case ofv Varc)

an F⊢×-prime-strip def⇔ {an isomorph of Fv⊢×}v∈V

(2) v Vnon ⇒ Fv⊢×µ: the×µ-Kummer Frobenioid “corresponding to”GvO×Fµ

v equipped with the×µ-Kummer structure, i.e., {Im(

(O×F

v)H =O×

FHv ,→ O×F

vOF×µ

v

)}HGv:open subgps

(omit the case ofv Varc)

an F⊢×µ-prime-strip def⇔ {an isomorph of Fv⊢×µ}v∈V

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(3) F ={Fv}v∈V: an F-prime-strip v Vbad Fv “corresponds to” Gv ↷(OF×

v×qN

v

modµ2l

←- qN

v)

Fv⊢▶×µ: the split-×µ-Kummer Frobenioid “corresponding to”

Gv ↷(OF×µ

v ×2l·qN

v2l)←-2l·qN

v2l))w/ ×µ-Kmm str.

v VgoodVnon Fv “corresponds to” Gv ↷(OF×

v ×pNv ←- pNv)

Fv⊢▶×µ: the split-×µ-Kummer Frobenioid “corresponding to”

Gv ↷(OF×µ

v ×pNv ←- pNv)w/ ×µ-Kmm str.

(omit the case ofv Varc)

an F⊢▶×µ-prime-strip def⇔ {an isomorph of Fv⊢▶×µ}v∈V

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(4) anF⊩▶×µ-prime strip def a suitable collection of data (C,Prime(C) V,F⊢▶×µ,{ρv}v∈V), i.e., a collection of data obtained by replacing the “F” of an F-prime strip “(C,Prime(C) V,F,{ρv}v∈V)” by an F⊢▶×µ-prime-strip F⊢▶×µ

Thus:

F-prime-strip func’l

alg’m

F⊢×-prime-strip func’l

alg’m

F⊢×µ-prime-strip

F-prime-strip func’l

alg’m

F⊢▶×µ-prime-strip

F-prime-strip func’l

alg’m

F⊩▶×µ-prime-strip

参照

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