2born (2born) wrote,
2born
2born

Популярная заметка об источнике звездной энергии

Общеизвестные вещи, но вдруг кому-то пригодится.

Children of the Stars: https://arxiv.org/abs/2012.09568
Henri Boffin
Even if it tends to hide more often in the current autumnal season, our host star, the Sun, is the principal source of energy on our planet. It has a luminosity of 3.828e26 Watts, and despite that we receive only 2 parts per billion of this, it allows for the Earth's life to thrive. Moreover, we know that the Sun has been shining in the same way for about 4.6 billion years (the age of the Earth) and will likely still do the same for another 5 billion years or so. The Sun's power engine, as well as the one of all the stars we see in the night sky, has for long been a mystery, but astronomers now have a good understanding of it.
Comments: A popular account of fusion in stars

Апдейт: на следующий день появилась большая статья, там в середине есть раздел со стандартной моделью Солнца:

A closer look at the pp-chain reaction in the Sun: Constraining the coupling of light mediators to protons: https://arxiv.org/abs/2012.11620

Anna M. Suliga, Shashank Shalgar (Niels Bohr Institute), George M. Fuller (University of California, San Diego)
The pp-chain of nuclear reactions is the primary route for energy production in the Sun. The first step in that reaction sequence converts two protons to a deuterium nucleus with the emission of a positron and electron neutrino. This reaction is extremely slow because it is a weak interaction, and significantly, it involves quantum tunneling through the Coulomb barrier. Though the reaction rate can be calculated with high confidence in the Standard Model, it has not been measured at solar energies. If there exist interactions that are engendered by non-standard mediators then the rate of this reaction in the Sun could be altered. We probe such non-standard interactions between two protons by performing self-consistent calculations of solar evolution to the current solar system age and then comparing to measured properties of the Sun, including solar neutrino results. We thereby obtain constraints on mediator mass and couplings in these beyond-standard-model scenarios. Constraints on these non-standard parameters could be extended further with better confidence on the value of the metallicity of the Sun and the solar neutrino CNO flux.
Comments: 22 pages, 5 figures
Tags: Мегаучебник или Что я читал и похвалил, популяризация, разгребая arXiv'ы
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