scholarly journals Massive graviton dark matter with environment dependent mass: A natural explanation of the dark matter-baryon ratio

2017 ◽  
Vol 96 (10) ◽  
Author(s):  
Katsuki Aoki ◽  
Shinji Mukohyama
Keyword(s):  
Dark Matter ◽  
Massive Graviton ◽  
Natural Explanation ◽  
Dependent Mass

scholarly journals Resurrecting low-mass axion dark matter via a dynamical QCD scale

2021 ◽  
Vol 2021 (12) ◽  
Author(s):  
Lucien Heurtier ◽  
Fei Huang ◽  
Tim M.P. Tait
Keyword(s):  
Dark Matter ◽  
Standard Model ◽  
Temperature Dependent ◽  
Axion Field ◽  
Wide Range ◽  
The Standard Model ◽  
Low Mass ◽  
Higher Temperature ◽  
Relic Abundance ◽  
Dependent Mass

Abstract In the framework where the strong coupling is dynamical, the QCD sector may confine at a much higher temperature than it would in the Standard Model, and the temperature-dependent mass of the QCD axion evolves in a non-trivial way. We find that, depending on the evolution of ΛQCD, the axion field may undergo multiple distinct phases of damping and oscillation leading generically to a suppression of its relic abundance. Such a suppression could therefore open up a wide range of parameter space, resurrecting in particular axion dark-matter models with a large Peccei-Quinn scale fa ≫ 1012 GeV, i.e., with a lighter mass than the standard QCD axion.

scholarly journals Evidence for Light-weight Local Group Dwarf Spheroidal Galaxies

2004 ◽  
Vol 220 ◽  
pp. 365-366
Author(s):  
J. R. Kuhn ◽  
D. Kocevski
Keyword(s):  
Dark Matter ◽  
Milky Way ◽  
Local Group ◽  
Light Weight ◽  
Natural Explanation ◽  
Dwarf Spheroidal Galaxies ◽  
Ursa Minor ◽  
Matter Component ◽  
Morphological State ◽  
Spheroidal Galaxies

A simple and natural explanation for the dynamics and morphology of the Local Group Dwarf Spheroidal galaxies, Draco (Dra) and Ursa Minor (UMi), is that they are weakly unbound stellar systems with no significant dark matter component. A gentle, but persistent, Milky Way (MW) tide has left them in their current kinematic and morphological state (the “parametric tidal excitation”). A new test of a dark matter dominated dS potential follows from a careful observation of the “clumpiness” of the dS stellar surface density.

IMPORTANCE OF STRANGE QUARKS IN HADRONS, NUCLEI AND DENSE MATTER

2010 ◽  
Vol 19 (12) ◽  
pp. 2293-2300
Author(s):  
A. W. Thomas
Keyword(s):  
Dark Matter ◽  
Neutron Stars ◽  
Recent Progress ◽  
Dense Matter ◽  
Natural Explanation ◽  
Strange Quarks ◽  
Quark Level ◽  
Order Of Magnitude ◽  
Remarkable Progress

We review recent progress in our understanding of the role of strange quarks in the structure of the nucleon. For the contribution to its mass the result is remarkably small, an order of magnitude smaller than commonly assumed. This has profound consequences for the searches for dark matter which are currently underway. There has also been remarkable progress in the understanding of hypernuclei. In particular, there is a very natural explanation at the quark level of why Λ-hypernuclei are bound whereas Σ-hypernuclei are not. The consequences for dense matter, for example in neutron stars, are not yet fully understood but we know they are significant.

scholarly journals A chiral model for sterile neutrino

2021 ◽  
Vol 2021 (12) ◽  
Author(s):  
Chun Liu ◽  
Yakefu Reyimuaji
Keyword(s):  
Dark Matter ◽  
Gauge Symmetry ◽  
Standard Model ◽  
Sterile Neutrino ◽  
Chiral Model ◽  
Dark Matter Candidate ◽  
Natural Explanation ◽  
The Standard Model

Abstract A model, which extends the standard model with a new chiral U(1)′ gauge symmetry sector, for the eV-mass sterile neutrino is constructed. It is basically fixed by anomaly free conditions. The lightness of the sterile neutrino has a natural explanation. As a by product, this model provides a WIMP-like dark matter candidate.

scholarly journals Massive Graviton as a Testable Cold-Dark-Matter Candidate

2005 ◽  
Vol 94 (18) ◽  
Author(s):  
S. L. Dubovsky ◽  
P. G. Tinyakov ◽  
I. I. Tkachev
Keyword(s):  
Dark Matter ◽  
Cold Dark Matter ◽  
Dark Matter Candidate ◽  
Massive Graviton

scholarly journals In the Quest for Cosmic Rotation

Universe ◽  
2020 ◽  
Vol 6 (1) ◽  
pp. 14 ◽  
Author(s):  
Vladimir A. Korotky ◽  
Eduard Masár ◽  
Yuri N. Obukhov
Keyword(s):  
General Relativity ◽  
Dark Matter ◽  
Dark Energy ◽  
Angular Velocity ◽  
Natural Explanation ◽  
Acceleration Parameter ◽  
Electronic Catalogs ◽  
Celestial Sphere ◽  
First Time ◽  
The Universe

This paper analyzes the problem of global rotation in general relativity (GR) theory. Simple cosmological models with rotation and expansion are presented, which give a natural explanation of the modern values of the acceleration parameter at different red shifts without involving the concepts of “dark energy” and “dark matter”. It is shown that due to the smallness of the cosmological rotation, for its detection one should use observations that do not depend on the magnitude of the angular velocity of the Universe. Such tests include the effects of the cosmic mirror and the cosmic lens. For the first time on the basis of modern electronic catalogs the search on the celestial sphere of images of our Galaxy and other galaxies is made. Viable candidates for both effects have been found.

scholarly journals MASSIVE GRAVITONS DARK MATTER SCENARIO REVISITED

2012 ◽  
Vol 27 (26) ◽  
pp. 1250146 ◽  
Author(s):  
HYUNG WON LEE ◽  
KYOUNG YEE KIM ◽  
YUN SOO MYUNG
Keyword(s):  
Dark Matter ◽  
Dark Energy ◽  
Cold Dark Matter ◽  
Equations Of State ◽  
Massive Graviton ◽  
The Past ◽  
Energy Models ◽  
Phantom Phase

We reexamine the massive graviton dark matter scenario (MGCDM) which was recently considered as an alternative to dark energy models. When introducing the native and effective equations of state (EoS), it is shown that there is no phantom phase in the evolution toward the far past. Also we show that the past accelerating phase arises from the interaction between massive graviton and cold dark matter.

scholarly journals γ-Ray emission signals in the massive graviton mediated dark matter model

2017 ◽  
Vol 916 ◽  
pp. 208-218 ◽  
Author(s):  
Cun Zhang ◽  
Ming-Yang Cui ◽  
Lei Feng ◽  
Yi-Zhong Fan ◽  
Zhong-Zhou Ren
Keyword(s):  
Dark Matter ◽  
Massive Graviton ◽  
Matter Model ◽  
Γ Ray ◽  
Dark Matter Model
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