摘要:該文研究一類帶非齊次記憶項拋物方程的柯西問題,討論非線性項和非齊次項對整體解存在性的影響。當(dāng)非線性項指數(shù)增長高于某一值時,利用壓縮映射原理,證明了整體解的存在唯一性;當(dāng)非線性項指數(shù)增長低于某一值時,利用測試函數(shù)法,證明了解在有限時刻爆破。
關(guān)鍵詞:柯西問題;壓縮映射原理;測試函數(shù)法;整體解;爆破
中圖分類號:O175.29 文獻(xiàn)標(biāo)志碼:A 文章編號:0253-2395(2024)05-0901-11
0 引言
本文研究如下非線性熱傳導(dǎo)方程的柯西問題
其中γ∈(0,1), pgt;1, α∈R, a( t )為( 0,∞ )→[ 0,∞ )連續(xù)且局部可積的函數(shù),w( x ) 為RN → R 連續(xù)且全局可積的函數(shù)。上述模型可以用于表示生物物種理論以及諸多物理現(xiàn)象[1-5],如生物物種的種群密度、流體的擴散濃度、熱傳導(dǎo)現(xiàn)象等。u (t,x) 表示化學(xué)反應(yīng)過程中的質(zhì)量密度或熱傳導(dǎo)過程中的溫度,記憶項∫0t (t - s)-γ| u (s) |p ds 可以描述過去一段時間內(nèi)的物理現(xiàn)象及反應(yīng)狀態(tài),具有一定的“記憶”效應(yīng)。注意到記憶項具有如下性質(zhì)
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基金項目:國家自然科學(xué)基金(11701477;11971394)