It’s been half a year since I posted the 1st of my papers about mirror-matter on arXiv on the Chinese New Year day of 2019 (BTW, year of the pig). Here is the brief summary of my work.

Understanding the mirror sector of the Universe

–to solve the puzzles of dark matter, baryogenesis, neutron lifetime, and star evolution

Originated from Lee and Yang’s seminal work on parity violation, a rather exact mirror matter model is proposed using spontaneous mirror symmetry breaking, which results in oscillations of neutral particles [1]. As it turns out, neutron-mirror neutron (n-n’) oscillations become one of the best messengers between the ordinary and the mirror worlds. The new n-n’ model resolves the neutron lifetime discrepancy, i.e., the 1% difference between measurements from “Beam” and “Bottle” experiments. The picture of how the mirror-to-ordinary matter density ratio is evolved in the early universe into today’s observed dark-to-baryon matter density ratio (~5.4) is gracefully demonstrated. A new theory of evolution and nucleosynthesis in stars [2] based on the new model of n-n’ oscillations presents remarkable agreement between the predictions and the observations. For example, progenitor mass limits and structures for white dwarfs and neutron stars, two different types of core collapse supernovae (Type II-P and Type II-L), synthesis of heavy elements, pulsating phenomena in stars, etc, can all be easily and naturally explained under the new theory.

More intriguingly, a natural extension of the new model applying kaon oscillations in the early universe shows a promising solution to the long-standing baryon asymmetry problem with new insights for the QCD phase transition and B-violation topological processes [3]. A consistent picture for the origin of both baryon asymmetry and dark matter can then be depicted with kaon and neutron oscillations under the new model. In addition, puzzles in ultrahigh energy cosmic rays have also been explained under the new mirror-matter model [4]. Last but not least, various laboratory measurements using current best technology are proposed to test the model and the extended CKM matrix [5].

[1] https://arxiv.org/abs/1902.01837

[2] https://arxiv.org/abs/1902.03685

[3] https://arxiv.org/abs/1904.03835

[4] https://arxiv.org/abs/1903.07474

[5] https://arxiv.org/abs/1906.10262

## Author: Wanpeng Tan

I am sharing my ideas and thoughts mainly about mirror matter theory and open science on this blog. Under the new theory, we live in the universe with a mirror (hidden) sector of particles. A perfectly imperfect (minimally broken) mirror symmetry is the key to unlock the beauty and elegance of our universe. Click on the menu links for a popular introduction, a technical summary, and list of my papers on the new mirror matter theory.
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