共查询到20条相似文献,搜索用时 15 毫秒
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R. F. Polishchuk 《Bulletin of the Lebedev Physics Institute》2017,44(4):114-117
Hypothesis of friedmons as dark matter particles is proposed. Friedmons are stable particles with a mass of billion nucleon masses. These particles correspond to the not yet been discovered exact symmetry group dual to the SU(2) group: for the Standard model symmetries and dual symmetries, the roles of exact and broken symmetries and corresponding stable and unstable particles change places. The hypothesis of the decay of the primordial de Sitter vacuum of the Planck density to an asymptotic state of the expanding Universe with de Sitter vacuum of the observed critical density is proposed. The T -duality and S-duality hypotheses relating subgroups SU(3)×SU(2)×U(1) and dual subgroups S??(3)× S??(2) × ??(1) with decay of the primordial symmetry group E(8) × ??(8) are proposed. In particular, these dualities relate the minimum Planck length 10?13 cm to the primordial curvature radius 10?13 cmof theMetagalaxy of the Planck density and its modern curvature radius of 1028 cm. That is, the probable relation of the Planck mass to the Metagalaxy mass of 1061 Planck masses is indicated. 相似文献
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Eichler D 《Physical review letters》1989,63(22):2440-2442
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We consider the singlet Majoron model with softly broken lepton number. This model contains three right-handed neutrinos and a singlet scalar besides the standard model fields. The real part of the singlet scalar develops a vacuum expectation value to generate the lepton number violation for seesaw and leptogenesis. The imaginary part of the singlet scalar becomes a massive pseudo-Majoron to be a dark matter candidate with testability by colliders, direct detection experiments and neutrino observations. 相似文献
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Shang Wang Changbo Fu De-Chang Dai Hongwei Wang Gongtao Fan Xiguang Cao Yugang Ma 《中国物理C(英文版)》2021,(9):1-9
The dark matter puzzle is one of the most important fundamental physics questions in the 21st century.There is no doubt that solving the puzzle will be a new milestone for human beings in achieving a deeper understanding of nature.Herein,we propose the use of the Shanghai laser electron gamma source(SLEGS) to search for dark matter candidate particles,including dark pseudo scalar particles,dark scalar particles,and dark photons.Our simulations indicate that,with some upgrading,electron facilities such as SLEGS could be competitive platforms in the search for light dark matter particles with a mass below tens of keV. 相似文献
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Within the framework of an explicit dynamical model, in which we calculate the radiatively-corrected, tree-level potential
that sets up inflation, we show that the inflaton can be a significant part of dark matter today. We exhibit potentials with
both a maximum and a minimum. Using the calculated position of the potential minimum, and an estimate for fluctuations of
the inflaton field in the early universe, we calculate a contribution to the matter energy density of in the present universe, from cold inflatons with mass of about . We show that the inflaton might decay in a specific way, and we calculate a possible lifetime that is several orders of
magnitude greater than the present age of the universe. Inflaton decay is related to an interaction which, together with a
spontaneous breakdown of CP invariance at a cosmological energy scale, can give rise to a neutrino-antineutrino asymmetry
just prior to the time of electroweak symmetry breaking.
Received: 26 November 1997 / Revised version: 8 December 1997 / Published online: 24 March 1998 相似文献
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Detection of a surprisingly high flux of positron annihilation radiation from the inner galaxy has motivated the proposal that dark matter is made of weakly interacting light particles (possibly as light as the electron). This scenario is extremely hard to test in current high energy physics experiments. Here, however, we demonstrate that the current value of the electron anomalous magnetic moment already has the required precision to unambiguously test the light dark matter hypothesis. If confirmed, the implications for astrophysics are far-reaching. 相似文献
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We investigate several varying-mass dark matter particle models in the framework of phantom cosmology. We examine whether there exist late-time cosmological solutions, corresponding to an accelerating universe and possessing dark energy and dark matter densities of the same order. Imposing exponential or power-law potentials and exponential or power-law mass dependence, we conclude that the coincidence problem cannot be solved or even alleviated. Thus, if dark energy is attributed to the phantom paradigm, varying-mass dark matter models cannot fulfill the basic requirement that led to their construction. 相似文献
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I. F. Ginzburg 《Physics of Particles and Nuclei Letters》2012,9(9-10):678-685
In many models stability of dark matter particles D (with mass M D ) is ensured by a new conserved quantum number which we call the D-parity. We consider models which also contain charged D-odd particle D ± (with mass M ±). We study the process e + e ? ?? D + D ? followed by decay of D ± to D and gauge bosons W (either on-shell or off-shell). Measuring the end points of the energy distribution of W??s would determine M D and M ±. However, the hadron mode of W decay would lead to low precision in this measurement. while the information from the lepton mode looks incomplete. I show that it is sufficient to measure the energy distribution of a single lepton (for definiteness ??) in the process e + e ? ?? ?? + 2jets + large missing E T . The well identified singularities in this distribution allow for determination of M D and M ± with a high precision. After that, measuring the corresponding cross section will allow one to determine the spin of D particles. 相似文献
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Here we generally prove that the axion as a coherently oscillating scalar field acts as a cold dark matter in nearly all cosmologically relevant scales. The proof is made in the linear perturbation order. Compared with our previous proof based on solutions, here we compare the equations in the axion with the ones in the cold dark matter, thus expanding the valid range of the proof. Deviation from purely pressureless medium appears in very small scale where axion reveals a peculiar equation of state. Our analysis is made in the presence of the cosmological constant, and our conclusions are valid in the presence of other fluid and field components. 相似文献
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Cold dark matter (CDM) models predict small-scale structure in excess of observations of the cores and abundance of dwarf galaxies. These problems might be solved, and the virtues of CDM models retained, even without postulating ad hoc dark matter particle or field interactions, if the dark matter is composed of ultralight scalar particles (m approximately 10(-22) eV), initially in a (cold) Bose-Einstein condensate, similar to axion dark matter models. The wave properties of the dark matter stabilize gravitational collapse, providing halo cores and sharply suppressing small-scale linear power. 相似文献
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Grigoris Panotopoulos 《General Relativity and Gravitation》2010,42(7):1755-1764
Bound states of two weakly interactive massive particles are studied. It is assumed that the WIMPonium is formed due to the
gravitational interaction, since the weak interaction can sometimes be repulsive. The lifetimes of the spontaneous emission
of gravitational radiation and of the WIMPs annihilation into a pair of gravitons are computed, and are shown to be many orders
of magnitude larger than the age of the universe. 相似文献
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In this work we propose to use leading singularities to obtain the classical pieces of amplitudes of two massive particles whose only interaction is gravitational. Leading singularities are generalizations of unitarity cuts. At one-loop we find that leading singularities obtained by multiple discontinuities in the t-channel contain all the classical information. As the main example, we show how to obtain a compact formula for the fully relativistic classical one-loop contribution to the scattering of two particles with different masses. The non-relativistic limit of the leading singularity agrees with known results in the post-Newtonian expansion. We also compute a variety of higher loop leading singularities including some all-loop families and study some of their properties. 相似文献