Commutator of Marcinkiewicz Integrals Associated with Schr?dinger Operators on Variable Exponent Spaces

SHU Yu

(Department of Economic and Trade, Anhui Business College Vocational Technology, Wuhu 241002, China)

Commutator of Marcinkiewicz Integrals Associated with Schr?dinger Operators on Variable Exponent Spaces

SHU Yu

(Department of Economic and Trade, Anhui Business College Vocational Technology, Wuhu 241002, China)

In this paper, we prove the boundedness of commutator of Marcinkiewicz integrals associated with Schr?dinger operators on variable exponent spaces.

Marcinkiewicz integrals; commutator; Schr?dinger operator; variable exponent; Morrey spaces

Classification code:O174.3 Document code: A Paper No:1001-2443(2016)06-0535-07

0 Introduction

In this paper, we consider the Schr?dinger differential operator onRn(n≥3).

L=-△+V(x)

AnonnegativelocallyLqintegrablefunctionV(x)onRnis said to belong toBq(q>1)ifthereexistsaconstantC>0suchthatthereverseH?lderinequality

holdsforeveryballinRn, see [1].

The commutator of Marcinkiewicz integral operatorμbisdefinedby

Stein[2]firstintroducedtheoperatorμandprovedthatμisoftype(p，p)(1

It is well known that function spaces with variable exponents were intensively studied during the past 20 years, due to their applications to PDE with non-standard growth conditions and so on, we mention e.g. ([8, 9]). A great deal of work has been done to extend the theory of maximal, potential, singular and Marcinkiewicz integrals operators on the classical spaces to the variable exponent case, see([10]-[15]). It will be an interesting problem whether we can establish the boundedness of commutator of Marcinkiewicz integrals associated with Schr?dinger operators on variable exponent spaces. The main purpose of this paper is to answer the above problem.

To meet the requirements in the following sections, here, the basic elements of the theory of the Lebesgue spaces with variable exponent are briefly presented.

Letp(·):Rn→[1，∞) be a measurable function. The variable exponent Lebesgue spaceLp(·)(Rn) is defined by

Lp(·)(Rn)isaBanachspacewiththenormdefinedby

Wedenote

LetP(Rn)bethesetofmeasurablefunctionp(·)onRnwith value in [1，∞) such that 1

andonedefines

B(Rn)isthesetofp(·)∈P(Rn)satisfyingtheconditionthatMisboundedonLp(·)(Rn).

Forx∈Rn,thefunctionmV(x)isdefinedby

Forbrevity,inthispaper,Calwaysmeansapositiveconstantindependentofthemainparametersandmaychangefromoneoccurrencetoanother.B(x，r)={y∈Rn:|x-y|

1 Results and Some Lemmas

Definition 1.1[12]For anyp(·)∈B(Rn),letkp(·)denotethesupremumofthoseq>1suchthatp(·)/q∈B(Rn).Letep(·)betheconjugateofkp′(·).

Definition 1.2[12]Letp(·)∈L∞(Rn)and10suchthatforanyx∈Rnandr>0,ufulfills

(1)

WedenotetheclassofMorreyweightfunctionsbyWp(·).

NextwedefinetheMorreyspaceswithvariableexponentrelatedtothenonnegativepotentialV.

Nowitisinthispositiontostateourresults.

Theorem 1.1 SupposeV∈Bqwithq>1andp(x)∈B(Rn),then

Theorem 1.2 SupposeV∈Bqwithq>1,b∈BMO，-∞<α<∞andp(x)∈B(Rn).If

(2)

then

Remark 1 We can easily show thatufulfills(2)impliesu∈Wp(·),see[16].

Inordertoproveourresult,weneedsomeconclusionsasfollows.

Lemma 1.1[18]Letp(·)∈P(Rn):Thenthefollowingconditionsareequivalent:

(1)p(·)∈B(Rn).

(2)p′(·)∈B(Rn).

(3) (p(·)/q∈B(Rn)forsome1

(4) (p(·)/q)′∈B(Rn)forsome1

Lemma1.1ensuresthatkp(·)iswell-definedandsatisfies1

Lemma 1.2[19]Ifp(·)∈P(Rn)，thenforallf∈Lp(·)(Rn)andallg∈Lp′(·)(Rn)wehave

∫Rn|f(x)g(x)|dx≤rp‖f‖Lp(·)(Rn)‖g‖Lp′(·)(Rn),

whererp:=1+1/p--1/p+.

Lemma 1.3[10]Ifp(·)∈B(Rn)，thenthereexistsC>0suchthatforallballsBinRn，

C-1|B|≤‖χB‖Lp(·)(Rn)‖χB‖Lp′(·)(Rn)≤C|B|.

Lemma 1.4[12]Letp(x)∈B(Rn).Forany10suchthatforanyx0∈Rnandr>0,wehave

Lemma 1.6[21]LetΩ∈Lipγ(Sn-1)，b(x)∈BMOandp(·)∈B(Rn),wehave

‖μbf‖Lp(·)(Rn)≤C‖f‖Lp(·)(Rn).

Lemma 1.7[1]For everyN>0thereexistsaconstantCsuchthat

and

Lemma 1.8[1]SupposeV∈Bqwithq≥n/2.ThenthereexistpositiveconstantsCandk0suchthat

Lemma 1.9[22]Letkbeapositiveinteger.Thenwehavethatforallb∈BMO(Rn) and alli，j∈Zwithi>j,

2 Proof of Theorems

Proof of Theorem 1.1 Fixx∈Rnand letr=ρ(x).Usingthesameideain[5]and[4],wehave

ForA1,byLemma1.7,wehave

Obviously,

ForA3,byLemma1.7,wehave

ItremainstoestimateA4.FromLemma1.7,takeN=1,weobtain

Thus,usingLemma1.5andLemma1.6,wearrivethefollowinginequality

andhencetheproofofTheorem1.1iscomplete.

wheref0=fχB(z，2r),fi=fχB(z,2i+1r)B(z,2ir)fori≥1.Hence,wehave

ByTheorem1.1,weobtain

Becauseinequality(1)andLemma1.4implythatu(x，r)≥Cu(x，2r).Therefore,weobtain

Furthermore,foranyi≥1,x∈B(z,r)andy∈B(z,2i+1r)B(z，2ir),wenotethat|x-y|≥|y-z|-|x-z|>C2ir.ByLemma1.7andMinkowski'sinequality,wehave

UsingLemma1.8,wederivetheestimate

(3)

ApplyingLemma1.2andinequality(3),wegetthat

Subsequently,takingthenorm‖·‖Lp(·)(Rn)andusingLemma1.9,wehave

×‖b‖BMO‖fχB(z,2i+1r)‖Lp(·)(Rn)‖χB(z,r)‖Lp(·)(Rn)‖χB(z,2i+1r)‖Lp′(·)(Rn).

ApplyingLemma1.3withB=B(z，2i+1),wehave

TakingN=(-[α]+1)(k0+1),weobtain

Asufulfills(2)andα<0,weobtain

andhencetheproofofTheorem1.2iscomplete.

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2016-03-10

SupportedbyNSFC(11201003)andEducationCommitteeofAnhuiProvince(KJ2016A253；SKSM201602).

SHU Yu(1985-), male, born in Wuhu, Anhui Province, Lecture, M.S.D.

束宇.變指數(shù)空間上與Schr?dinger算子相關(guān)的Marcinkiewica積分算子交換子[J].安徽師范大學(xué)學(xué)報(bào)：自然科學(xué)版，2016，39(6)：535-541.

變指數(shù)空間上與Schr?dinger算子相關(guān)的Marcinkiewicz積分算子交換子

束 宇

(安徽商貿(mào)職業(yè)技術(shù)學(xué)院 經(jīng)濟(jì)貿(mào)易系，安徽 蕪湖 241002)

在本文中，我們主要證明了變指數(shù)空間上與Schr?dinger算子相關(guān)的Marcinkiewicz積分算子交換子的有界性.

Marcinkiewicz積分；交換子；Schr?dinger算子；變指數(shù)；Morrey空間

10.14182/J.cnki.1001-2443.2016.06.006