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1. chinaXiv:202101.00003 [pdf]

On dark matter

Xian-Qiao Yu
Subjects: Physics >> The Physics of Elementary Particles and Fields

In this article, I shall propose a new model of dark matter, in which I introduce a neutral primordial axial-vector field, which is a new field beyond the standard model. All the standard model elementary particles are produced spontaneously from this field in the Big Bang epoch of the universe and then these produced elementary particles decayed or annihilated in the well-known standard model interactions. The relic of the primordial axial-vector field appears in a form of vacuum energy can not only give naturally the correct abundance of dark matter in the present universe, but provide a natural solution to the cosmological constant problem as well. Some possible experiments for testing the new theory of dark matter are also suggested in this article.

submitted time 2021-03-29 Hits1773Downloads378 Comment 0

2. chinaXiv:201809.00161 [pdf]

Modified Newtonian Dynamics with Inverse Dissipation Potential as an Alternative to Dark Matter and Dark Energy

Subjects: Astronomy >> Astrophysics

This paper introduces the inverse dissipation potential into the Newtonian Dynamic equation and studies the motion equations of the objects in the isolated gravitational system. It is found that at large scales it can derive the dynamical equation of cosmic expansion similar to the ΛCDM model and yield the flat rotation curves for spiral galaxy. Different from the usual dark matter models, the derived flat rotation curves are the result of time accumulation rather than the direct action of mechanics. And the Tully-Fisher relationship is also discussed, it is found that the basic constant a0 in the MOND model and the form of the function μ have a clear corresponding physical significance in the model of this paper.

submitted time 2018-09-16 Hits8283Downloads920 Comment 0

5. chinaXiv:201711.02297 [pdf]

The low temperature performance of CsI(Na) crystals for WIPMs direct searchesI

Xuan Zhang; Xilei Sun; Junguang Lu; Pin Lv
Subjects: Physics >> General Physics: Statistical and Quantum Mechanics, Quantum Information, etc.

Previous studies showed that CsI(Na) crystals have signi cantly di erent wave- forms between alpha and gamma scintillations. In this work, the light yield and PSD capability of CsI(Na) scintillators as a function of the temperature down to 80 K has been studied. As temperature drops, the fast component rises and the slow component decreases. By cooling the CsI(Na) crystals, the light yield of high ionization events are enhanced signi cantly, while the light yield of background gamma events are suppressed. At 110 K, CsI(Na) crystal achieves the optimal balance between low threshold and good background re- jection performance. The di erent responses of CsI(Na) to gamma and alpha at di erent temperatures are explained with self-trapped and activator lumines- cence centers.

submitted time 2017-11-10 Hits819Downloads425 Comment 0

6. chinaXiv:201612.00476 [pdf]

Experimental constraints on nMSSM and implications on its phenomenology

Cao,J; Logan,HE; Yang,JM

We examine various direct and indirect experimental constraints on the nearly minimal supersymmetric standard model (nMSSM) and obtain the following observations: (i) The combination of current experiments stringently constrains the parameter space, setti

submitted time 2016-12-28 Hits2390Downloads1397 Comment 0

7. chinaXiv:201612.00470 [pdf]

Dark Matter in the Singlet Extension of MSSM: Explanation of Pamela and Implication on Higgs Phenomenology

Wang,W; Xiong,Z; Yang,JM; Yu,L

As discussed recently by Hooper and Tait, the singlino-like dark matter in the Minimal Supersymmetric Standard Model (MSSM) extended by a singlet Higgs superfield can give a perfect explanation for both the relic density and the Pamela result through the

submitted time 2016-12-28 Hits2429Downloads1469 Comment 0

8. chinaXiv:201612.00463 [pdf]

Dark matter and Higgs phenomenology predicted by left-right twin Higgs model in light of CDMS II results

Wang,L; Yang,JM

The left-right twin Higgs model predicts a light stable scalar \hat{S}, which is a candidate for WIMP dark matter. We study its scattering on nucleon and find that the cross section is below the CDMS II upper bound but can reach the SuperCDMS sensitivity.

submitted time 2016-12-28 Hits1538Downloads866 Comment 0

9. chinaXiv:201612.00462 [pdf]

SUSY dark matter in light of CDMS II results: a comparative study for different models

Cao,J; Hikasa,K; Wang,W; Yang,JM; Yu,L

We perform a comparative study of the neutralino dark matter scattering on nucleon in three popular supersymmetric models: the minimal (MSSM), the next-to-minimal (NMSSM) and the nearly minimal (nMSSM). First, we give the predictions of the elastic cross

submitted time 2016-12-28 Hits2089Downloads1189 Comment 0

10. chinaXiv:201612.00461 [pdf]

Dark matter in the MSSM and its singlet extension


We briefly review the supersymetric explanation for the cosmic dark matter. Although the neutralino in the minimal supersymmetric model (MSSM), the next-to-minimal supersymmetric model (NMSSM) and the nearly minimal supersymmetric model (nMSSM) can natura

submitted time 2016-12-28 Hits1446Downloads845 Comment 0

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