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<prosody rate="medium">Since the fluctuations are isotropic, the vacuum expectation value,</prosody><break time="200ms"/><prosody rate="slow">written as <emphasis>left angle bracket</emphasis>, <emphasis>delta vector r</emphasis>, <emphasis>right angle bracket</emphasis>,</prosody><break time="150ms"/><prosody rate="slow">with subscript <emphasis>v a c</emphasis>,</prosody><break time="200ms"/><prosody rate="medium"><emphasis>equals zero.</emphasis></prosody>