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We investigate the weak gravitational lensing effect on the two-pointcorrelation function of local maxima (hot spots) in the cosmic 21 cmfluctuation map. The intrinsic two-point function has a pronounced depressionfeature around the angular scale of $\theta \sim 40$ arcmin, which depends onthe observed frequency and corresponds to the scale of the acoustic oscillationof cosmic plasma before the recombination. It is found that the weak lensinginduces a large w-dependent smoothing at that scale where w is the equation ofstate parameter of dark energy and thus provides a useful constraints on thedark energy property combined with the depression angular scales on thetwo-point correlation function.

Gravitational Lensing Effect on the Two-Point Correlation Function of Hot Spots in 21 cm fluctuations