Abstract:Abstract. We consider Strichartz estimates for the wave equation with respect to general measures which satisfy certain growth conditions. In R 3+1 we obtain the sharp estimate and in higher dimensions improve the previous results.
“…I am not aware of such results. However, in addition to the spherical averages (discussed in Section 4), which have been studied for a long time, there are recent estimates for cones and hyperboloids; see [2], [13], and [1].…”
For Sg(x, y) = x − g(y), x, y ∈ R n , g ∈ O(n), we investigate the Lebesgue measure and Hausdorff dimension of Sg(A) given the dimension of A, both for general Borel subsets of R 2n and for product sets.
“…I am not aware of such results. However, in addition to the spherical averages (discussed in Section 4), which have been studied for a long time, there are recent estimates for cones and hyperboloids; see [2], [13], and [1].…”
For Sg(x, y) = x − g(y), x, y ∈ R n , g ∈ O(n), we investigate the Lebesgue measure and Hausdorff dimension of Sg(A) given the dimension of A, both for general Borel subsets of R 2n and for product sets.
“…In this paper we take an alternative approach which relies on the fractal Strichartz estimate with respect to a measure (see (1.7) below), which was previously studied by some authors (see [22,7,2,10,18]). Via the approach we prove the conjecture (1.2) when d = 3 and improve the previously known results (see (1.4)) for higher dimensions d ≥ 4 and…”
We consider the Hausdorff dimension of the divergence set on which the pointwise convergence lim t→0 e itWe especially prove the conjecture raised by Barceló, Bennett, Carbery and Rogers [1] for d = 3, and improve the previous results in higher dimensions d ≥ 4. We also show that a Strichartz type estimate for f → e it √ −∆ f with the measure dt dµ(x) is essentially equivalent to the estimate for the spherical average of µ which has been extensively studied for the Falconer distance set problem. The equivalence provides shortcuts to the recent results due to Liu [11] and Rogers [18].
“…When d ≥ 3 the estimate (1.4) is relatively easier to obtain. There are various estimates which are straightforward consequences of the fractal Strichartz estimates for the wave equation ( [8,13]). We discuss the matter in Section 3.…”
We prove new L p -L q estimates for averages over dilates of the circle with respect to α-dimensional fractal measure, which unify different types of maximal estimates for the circular average. Our results are consequences of L p -L q smoothing estimates for the wave operator relative to fractal measures. We also discuss similar results concerning the spherical averages. 2020 Mathematics Subject Classification. 42B25. Key words and phrases. circular average, general measures.
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