Measure‐valued processes for energy markets
提出用非负测度值过程建模电力与天然气期货市场，将HJM方法扩展到无限维空间，允许随机跳跃，并利用神经网络参数化扩散项实现可校准的模型。
Abstract We introduce a framework that allows to employ (non‐negative) measure‐valued processes for energy market modeling, in particular for electricity and gas futures. Interpreting the process' spatial structure as time to maturity, we show how the Heath–Jarrow–Morton approach can be translated to this framework, thus guaranteeing arbitrage free modeling in infinite dimensions, while allowing for the incorporation of important stylized facts, in particular stochastic discontinuities, that is, jumps or spikes at pre‐specified (deterministic) dates. We derive an analog to the HJM‐drift condition and then treat in a Markovian setting existence of non‐negative measure‐valued diffusions that satisfy this condition. To analyze mathematically convenient classes we consider measure‐valued polynomial and affine diffusions, where we can precisely specify the diffusion part in terms of continuous functions satisfying certain admissibility conditions. For calibration purposes these functions can then be parameterized by neural networks yielding measure‐valued analogs of neural SPDEs. By combining Fourier approaches or the moment formula with stochastic gradient descent methods, this then allows for tractable calibration procedures which we also test by way of example on market data.