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Diffusion of knowledge and the lottery society 知识传播与彩票社会
Pub Date : 2024-09-17 DOI: arxiv-2409.11479
Henri Berestycki, Alexei Novikov, Jean-Michel Roquejoffre, Lenya Ryzhik
The Lucas-Moll system is a mean-field game type model describing the growthof an economy by means of diffusion of knowledge. The individual agents in the economy advance theirknowledge by learning from each other and via internal innovation. Theircumulative distribution function satisfies a forward in time nonlinearnon-local reaction-diffusion type equation. On the other hand, the learningstrategy of the agents is based on the solution to a backward in time nonlocalHamilton-Jacobi-Bellman equation that is coupled to the aforementioned equationfor the agents density. Together, these equations form a system of themean-field game type. When the learning rate is sufficiently large, existenceof balanced growth path solutions to the Lucas-Moll system was provedin~cite{PRV,Porretta-Rossi}. Here, we analyze a complementary regime where thebalanced growth paths do not exist. The main result is a long time convergencetheorem. Namely, the solution to the initial-terminal value problem behaves insuch a way that at large times an overwhelming majority of the agents spend notime producing at all and are only learning. In particular, the agents densitypropagates at the Fisher-KPP speed. We name this type of solutions a lotterysociety.
卢卡斯-莫尔体系是一个平均场博弈模型,通过知识的扩散来描述经济的增长。经济中的个体通过相互学习和内部创新来提高知识水平。他们的累积分布函数满足一个时间向前的非线性非局部反应-扩散型方程。另一方面,代理人的学习策略基于一个后向非局部哈密尔顿-雅各比-贝尔曼方程的解,该方程与上述代理人密度方程耦合。这些方程共同构成了一个主题领域博弈类型的系统。当学习率足够大时,卢卡斯-莫尔系统的平衡增长路径解的存在性在~/cite{PRV,Porretta-Rossi}中得到了证明。在此,我们分析了不存在平衡增长路径的互补机制。主要结果是一个长时间收敛定理。也就是说,初始-终值问题的解的表现是,在大段时间内,绝大多数代理人根本没有时间生产,而只是在学习。特别是,代理密度会以费舍尔-KPP 的速度增长。我们将这类解决方案命名为抽签社会。
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引用次数: 0
Regularisation by multiplicative noise for reaction-diffusion equations 用乘法噪声对反应扩散方程进行正则化
Pub Date : 2024-09-17 DOI: arxiv-2409.11130
Konstantinos Dareiotis, Teodor Holland, Khoa Lê
We consider the stochastic reaction-diffusion equation in $1+1$ dimensionsdriven by multiplicative space-time white noise, with a distributional driftbelonging to a Besov-H"older space with any regularity index larger than $-1$.We assume that the diffusion coefficient is a regular function which is boundedaway from zero. By using a combination of stochastic sewing techniques andMalliavin calculus, we show that the equation admits a unique solution.
我们考虑由乘法时空白噪声驱动的 1+1$ 维随机反应-扩散方程,该方程的分布漂移属于任意正则指数大于 $-1$ 的 Besov-H "老空间。通过使用随机缝纫技术和马利亚文微积分相结合的方法,我们证明该方程有一个唯一的解。
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引用次数: 0
A note on the Taylor estimates of iterated paraproducts 关于迭代旁积的泰勒估计的说明
Pub Date : 2024-09-17 DOI: arxiv-2409.10817
Masato Hoshino
Bony's paraproduct is one of the main tools in the theory of paracontrolledcalculus. The paraproduct is usually defined via Fourier analysis, so it is nota local operator. In the previous researches [7, 8], however, the author provedthat the pointwise estimate like (1.2) holds for the paraproduct and itsiterated versions when the sum of the regularities is smaller than 1. The aimof this article is to extend these results for higher regularities.
博尼准积是准控制微积分理论的主要工具之一。旁积通常是通过傅立叶分析定义的,因此它不是一个局部算子。然而,在之前的研究[7, 8]中,作者证明了当正则之和小于 1 时,对于旁积及其iterated 版本,类似 (1.2) 的点估计是成立的。
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引用次数: 0
Color symmetry breaking in the Potts spin glass 波茨自旋玻璃中的色彩对称破缺
Pub Date : 2024-09-16 DOI: arxiv-2409.10437
Jean-Christophe Mourrat
The Potts spin glass is an analogue of the Sherrington-Kirkpatrick model inwhich each spin can take one of $kappa$ possible values, which we interpret ascolors. It was suggested in arXiv:2310.06745 that the order parameter for thismodel is always invariant with respect to permutations of the colors. We showhere that this is false whenever $kappa ge 58$.
波茨自旋玻璃是谢林顿-柯克帕特里克(Sherrington-Kirkpatrick)模型的一个类似物,其中每个自旋都可以取$kappa$可能值中的一个,我们将其解释为颜色。有人在 arXiv:2310.06745 中提出,这个模型的阶次参数在颜色的排列上总是不变的。我们在这里证明,只要 $kappa ge 58$,这就是假的。
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引用次数: 0
Local central limit theorem for Mallows measure 马洛尺度的局部中心极限定理
Pub Date : 2024-09-16 DOI: arxiv-2409.10415
Alexey Bufetov, Kailun Chen
We study the statistics of the Mallows measure on permutations in the limitpioneered by Starr (2009). Our main result is the local central limit theoremfor its height function. We also re-derive versions of the law of large numbersand the large deviation principle, obtain the standard central limit theoremfrom the local one, and establish a multi-point version of the local centrallimit theorem.
我们在 Starr(2009)的极限开创中研究了关于排列的 Mallows 度量的统计。我们的主要结果是其高度函数的局部中心极限定理。我们还重新推导了大数定律和大偏差原理的版本,从局部中心极限定理得到了标准中心极限定理,并建立了局部中心极限定理的多点版本。
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引用次数: 0
On the tensorization of the variational distance 关于变分距离的张量化
Pub Date : 2024-09-16 DOI: arxiv-2409.10368
Aryeh Kontorovich
If one seeks to estimate the total variation between two product measures$||P^otimes_{1:n}-Q^otimes_{1:n}||$ in terms of their marginal TV sequence$delta=(||P_1-Q_1||,||P_2-Q_2||,ldots,||P_n-Q_n||)$, then trivial upper andlower bounds are provided by$ ||delta||_infty le||P^otimes_{1:n}-Q^otimes_{1:n}||le||delta||_1$. We improve the lower boundto $||delta||_2lesssim||P^otimes_{1:n}-Q^otimes_{1:n}||$, thereby reducingthe gap between the upper and lower bounds from $sim n$ to $simsqrt $.Furthermore, we show that {em any} estimate on$||P^otimes_{1:n}-Q^otimes_{1:n}||$ expressed in terms of $delta$ mustnecessarily exhibit a gap of $simsqrt n$ between the upper and lower boundsin the worst case, establishing a sense in which our estimate is optimal.Finally, we identify a natural class of distributions for which $||delta||_2$approximates the TV distance up to absolute multiplicative constants.
如果要估计两个产品测量值之间的总变化$||P^otimes_{1:n}-Q^otimes_{1:n}|$的边际TV序列$|delta=(||P_1-Q_1||,||P_2-Q_2||,ldots,||P_n-Q_n||)$,那么$||delta||_infty le||P^otimes_{1:n}-Q^otimes_{1:n}||le|||delta||_1$提供了微不足道的上界和下界。我们将下界改进为 $|||delta||_2lesssim||P^otimes_{1:n}-Q^otimes_{1:n}||$,从而将上界和下界之间的差距从 $sim n$ 缩小到 $sim/sqrt$。此外,我们还证明了{em any}估计$||P^otimes_{1:n}-Q^otimes_{1:n}||$用$delta$表示时,在最坏的情况下,上界和下界之间必须有$simsqrt n$的差距,从而确立了我们的估计在某种意义上是最优的。最后,我们确定了一类自然的分布,对于这类分布,$||delta||_2$近似于电视距离,直到绝对乘法常数。
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引用次数: 0
Ornstein-Uhlenbeck fluctuations for the line counting process of the ancestral selection graph 祖先选择图的线计数过程的奥恩斯坦-乌伦贝克波动
Pub Date : 2024-09-16 DOI: arxiv-2409.10360
Florin Boenkost, Anna-Lena Weinel
For the Moran model with strong or moderately strong selection we prove thatthe fluctuations around the deterministic limit of the line counting process ofthe ancestral selection graph converges to an Ornstein-Uhlenbeck process. Tothis purpose we provide an extension of a functional limit theorem by Ethierand Kurtz 1986. This result and a small adaptation of our arguments can also beused to obtain the scaling limit for the fluctuations of certain logisticbranching processes.
对于具有强选择或中度强选择的莫兰模型,我们证明了祖先选择图的线计数过程的确定性极限附近的波动收敛于奥恩斯坦-乌伦贝克过程。为此,我们对 1986 年 Ethier 和 Kurtz 的函数极限定理进行了扩展。这一结果和我们的论证稍作调整,也可用于获得某些逻辑分支过程波动的缩放极限。
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引用次数: 0
TASEP in half-space 半空间 TASEP
Pub Date : 2024-09-16 DOI: arxiv-2409.09974
Xincheng Zhang
We study the half-space TASEP with a reservoir at the origin. We solve themodel for a general deterministic initial condition. Taking the 1:2:3 KPZscaling, we derive the transition probability for the half-space KPZ fixedpoint.
我们研究了原点有水库的半空间 TASEP。我们求解了一般确定性初始条件下的模型。根据 1:2:3 的 KPZ 缩放,我们得出了半空间 KPZ 固定点的过渡概率。
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引用次数: 0
Uniform-in-$N$ log-Sobolev inequality for the mean-field Langevin dynamics with convex energy 具有凸能量的均场朗格文动力学的均匀-N$对数-索博列夫不等式
Pub Date : 2024-09-16 DOI: arxiv-2409.10440
Sinho Chewi, Atsushi Nitanda, Matthew S. Zhang
We establish a log-Sobolev inequality for the stationary distribution ofmean-field Langevin dynamics with a constant that is independent of the numberof particles $N$. Our proof proceeds by establishing the existence of aLipschitz transport map from the standard Gaussian measure via the reverse heatflow of Kim and Milman.
我们为平均场朗格文动力学的静态分布建立了一个对数-索博列夫不等式,其常数与粒子数 $N$ 无关。我们的证明是通过 Kim 和 Milman 的反向热流,从标准高斯量度建立利普希兹传输映射的存在性。
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引用次数: 0
On Approximations of Subordinators in $L^p$ and the Simulation of Tempered Stable Distributions 论$L^p$中的近似下位数与节制稳定分布的模拟
Pub Date : 2024-09-16 DOI: arxiv-2409.09909
Michael Grabchak, Sina Saba
Subordinators are infinitely divisible distributions on the positivehalf-line. They are often used as mixing distributions in Poisson mixtures. Weshow that appropriately scaled Poisson mixtures can approximate the mixingsubordinator and we derive a rate of convergence in $L^p$ for each$pin[1,infty]$. This includes the Kolmogorov and Wasserstein metrics asspecial cases. As an application, we develop an approach for approximatesimulation of the underlying subordinator. In the interest of generality, wepresent our results in the context of more general mixtures, specifically thosethat can be represented as differences of randomly stopped L'evy processes.Particular focus is given to the case where the subordinator belongs to theclass of tempered stable distributions.
副基数是正半线上无限可分的分布。它们经常被用作泊松混合物中的混合分布。我们发现,适当缩放的泊松混合物可以近似于混合副集,并且我们推导出了每个$p/in[1,infty]$的$L^p$收敛率。这包括科尔莫哥洛夫度量和瓦瑟斯坦度量这两种特殊情况。作为应用,我们开发了一种近似模拟底层从属器的方法。为了保持一般性,我们将在更一般的混合物背景下展示我们的结果,特别是那些可以表示为随机停止的 L'evy 过程的差异的混合物。
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引用次数: 0
期刊
arXiv - MATH - Probability
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