Justified & Ancient
- Apr 26, 2015
- Reaction score
- East Norfolk coast
The Autodidactic Universe
We present an approach to cosmology in which the Universe learns its own physical laws. It does so by exploring a landscape of possible laws, which we express as a certain class of matrix models.
We discover maps that put each of these matrix models in correspondence with both a gauge/gravity theory and a mathematical model of a learning machine, such as a deep recurrent, cyclic neural network. This establishes a correspondence between each solution of the physical theory and a run of a neural network. This correspondence is not an equivalence, partly because gauge theories emerge from N → ∞ limits of the matrix models, whereas the same limits of the neural networks used here are not well-defined. We discuss in detail what it means to say that learning takes place in autodidactic systems, where there is no supervision.
We propose that if the neural network model can be said to learn without supervision, the same can be said for the corresponding physical theory. 1 arXiv:2104.03902v1 [hep-th] 29 Mar 2021We consider other protocols for autodidactic physical systems, such as optimization of graph variety, subset-replication using self-attention and look-ahead, geometrogenesis guided by reinforcement learning, structural learning using renormalization group techniques, and extensions. These protocols together provide a number of directions in which to explore the origin of physical laws based on putting machine learning architectures in correspondence with physical theories.
2021 Lyrid meteor shower: All you need to know
Posted by Bruce McClure and Deborah Byrd in ASTRONOMY ESSENTIALS | TONIGHT | April 20, 2021
The Lyrids are an Earth Day meteor shower, peaking on the morning of April 22. Also, try the next morning, April 23. The moon is waxing – staying out longer after dark each night – so you’ll want to watch the time of moonset carefully.
The annual Lyrid meteor shower always brings an end to the meteor drought, which happens each year between January and mid-April. There are no major meteor showers during that time, as you can see by looking at EarthSky’s meteor shower guide. The Lyrids are active each year from about April 16 to 25. In 2021, we expect the shower to peak in the predawn hours on Thursday, April 22. The following morning (April 23) might be good too, if you’re game.