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1. chinaXiv:202009.00004 [pdf]

一元半正定多项式SOS的简易算法

黄勇; 曾振柄; 杨路; 饶永生
Subjects: Mathematics >> Theoretical Computer Science

本文给出一元半正定多项式平方和表示的一个简单容易的构造性方法.

submitted time 2020-09-06 Hits2082Downloads116 Comment 0

2. chinaXiv:202009.00011 [pdf]

The cosmological constant from space-time discreteness

Qi-Qi Fan; Cong Li; Hao-Ran Zhang; Peng-Zhang He,; Jian-Bo Deng
Subjects: Physics >> The Physics of Elementary Particles and Fields

We regard the background of space-time as a physical system composed of discrete volume elements at the Planck scale and get the internal energy of space-time by Debye model. A temperature-dependent minimum energy limit of the particles is proposed from the thermal motion part of the internal energy. As decreases of the temperature caused by the expansion of the universe, more and more particles would be "released" because of the change of the energy limit, we regard these new particles as a source of dark energy. The minimum energy limit also leads to a corrected number of particles in universe and a modified conservation equation. According to the modified conservation equation, an effective cosmological constant consistent with its observed value is obtained.

submitted time 2020-09-06 Hits1340Downloads74 Comment 0

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