particle dark matter observations models and searches pdf

Particle Dark Matter Observations Models And Searches Pdf

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Published: 28.04.2021

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There is now an enormously rich variety of experimental techniques being brought to bear on experimental searches for dark matter, covering a wide range of suggested forms for it. I will then discuss experimental searches, both direct and indirect. Finally, I will offer prospects for the future.

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Experimental Searches for Dark Matter

Not a MyNAP member yet? Register for a free account to start saving and receiving special member only perks. What is the universe made of? The answer to this very simple question is not so simple. Baryons, the familiar neutrons and protons of which we, Earth, and the stars are made of, do not account for most of the mass in the universe. Instead, we appear to live in a universe composed primarily of new, unfamiliar, and unidentified forms of matter and energy. Three main pieces of evidence support this conclusion.

Thank you for visiting nature. You are using a browser version with limited support for CSS. To obtain the best experience, we recommend you use a more up to date browser or turn off compatibility mode in Internet Explorer. In the meantime, to ensure continued support, we are displaying the site without styles and JavaScript. We know that dark matter constitutes 85 per cent of all the matter in the Universe, but we do not know of what it is made. Amongst the many dark matter candidates proposed, WIMPs weakly interacting massive particles occupy a special place, because they arise naturally from new theories that seek to extend the standard model of particle physics.

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Invisible dark matter makes up most of the universe — but we can only detect it from its gravitational effects. Galaxies in our universe seem to be achieving an impossible feat. They are rotating with such speed that the gravity generated by their observable matter could not possibly hold them together; they should have torn themselves apart long ago. The same is true of galaxies in clusters, which leads scientists to believe that something we cannot see is at work. They think something we have yet to detect directly is giving these galaxies extra mass, generating the extra gravity they need to stay intact.


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This article presents an extensive review of the status of the search of the dark matter. The first eight sections are devoted to topics in dark matter and its experimental searches, and the rest to selected topics in astrophysics and cosmology, which are intended to supply some of the needed background for students in particle physics. Sections 9 and 13 are introductory cosmology. The three astrophysical topics, Big Bang nucleosynthesis Section 10, Boltzmann transport equation and freeze out of massive particles Section 11, and CMB anisotropy Section 12 can all be studied in analytical approaches when reasonable approximations are made.

 - Стратмор помахал оружием и встал.  - Нужно найти ключ Хейла. Сьюзан замолчала. Коммандер, как всегда, прав.

Обхватил ее своими ручищами.

 Ключ… - Ее передернуло.  - Коммандер Стратмор отправил кого-то в Испанию с заданием найти ключ. - И что? - воскликнул Джабба.  - Человек Стратмора его нашел. Сьюзан, больше не в силах сдержать слезы, разрыдалась.

 Червь, - недовольно сказал Джабба.  - Никакой усложненной структуры, один лишь инстинкт: жри, опорожняйся и ползи. Вот что это .

Он часто представлял, как занимается с ней сексом: прижимает ее к овальной поверхности ТРАНСТЕКСТА и берет прямо там, на теплом кафеле черного пола. Но Сьюзан не желала иметь с ним никакого дела. И, что, на взгляд Хейла, было еще хуже, влюбилась в университетского профессора, который к тому же зарабатывал сущие гроши.

 Каждый, кто к нему прикоснется, будет уничтожен. Повисла тишина.

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