Entropy jumps in the presence of a spectral gap
Entropy jumps in the presence of a spectral gap
复制标题
存在光谱间隙时熵跳跃
DOI:
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发表时间:
2003
期刊:
影响因子:
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通讯作者:
A. Naor
中科院分区:
文献类型:
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作者:
K. Ball;F. Barthe;A. Naor
It is shown that if X is a random variable whose density satisfies a Poincare inequality, and Y is an independent copy of X, then the entropy of (X + Y )/ p 2 is greater than that of X by a fixed fraction of the entropy gap between X and the Gaussian of the same variance. The argument uses a new formula for the Fisher information of a marginal, which can be viewed as a reverse form of the Brunn-Minkowski inequality (in its functional form due to Prekopa and Leindler).