scholarly journals HOLOGRAPHIC SPACE–TIME AND ITS PHENOMENOLOGICAL IMPLICATIONS

2010 ◽  
Vol 25 (26) ◽  
pp. 4875-4887 ◽  
Author(s):  
T. BANKS
Keyword(s):  
Dark Matter ◽  
Dipole Moment ◽  
Cosmological Constant ◽  
Magnetic Dipole Moment ◽  
Space Time ◽  
Susy Breaking ◽  
Gauge Mediation ◽  
Cosmological Constant Problem ◽  
Hidden Sector ◽  
Unique Model

I briefly review the theory of holographic space–time and its relation to the cosmological constant problem, and the breaking of supersymmetry (SUSY). When combined with some simple phenomenological requirements, these ideas lead to a fairly unique model for Tera-scale physics, which implies direct gauge mediation of SUSY breaking and a model for dark matter as a hidden sector baryon, with nonzero magnetic dipole moment.

scholarly journals Dark matter spin–spin interaction through the pseudo-scalar vacuum field

2020 ◽  
Vol 35 (15) ◽  
pp. 2050117
Author(s):  
Alexander I. Nesterov ◽  
Gennady P. Berman ◽  
Vladimir I. Tsifrinovich ◽  
Xidi Wang ◽  
Marco Merkli
Keyword(s):  
Dark Matter ◽  
Dipole Moment ◽  
Magnetic Dipole Moment ◽  
Exact Expression ◽  
Vacuum Field ◽  
Spin Interaction ◽  
Decoherence Rate ◽  
Pseudo Scalar ◽  
Secular Approximation ◽  
The Universe

We suggest that the pseudo-scalar vacuum (PSV) field in the dark matter (DM) sector of the Universe may be as important as the electromagnetic vacuum field in the baryonic sector. In particular, the spin–spin interaction between the DM fermions, mediated by PSV, may represent the strongest interaction between the DM fermions due to the absence of the electric charge and the magnetic dipole moment. Based on this assumption, we consider the influence of the spin–spin interaction, mediated by PSV, on the spin precession of the DM fermions (e.g. neutralino). In the secular approximation, we obtain the exact expression describing the frequency of the precession and estimate the decoherence rate.

scholarly journals THE POINCARÉ CONJECTURE AND THE COSMOLOGICAL CONSTANT

2011 ◽  
Vol 03 ◽  
pp. 195-202
Author(s):  
M. D. MAIA
Keyword(s):  
Cosmological Constant ◽  
Riemannian Geometry ◽  
Extrinsic Curvature ◽  
Space Time ◽  
Local Change ◽  
Accelerated Expansion ◽  
Observable Effect ◽  
Cosmological Constant Problem ◽  
Expansion Of The Universe ◽  
The Universe

The concept of deformation of Riemannian geometry is reviewed, with applications to gravitation and cosmology. Starting with an analysis of the cosmological constant problem, it is shown that space-times are deformable in the sense of local change of shape. These deformations leave an observable signature in the space-time, characterized by a conserved tensor, associated with a tangent acceleration, defined by the extrinsic curvature of the space-time. In the applications to cosmology, we find that the accelerated expansion of the universe is the observable effect of the deformation, dispensing with the cosmological constant and its problems.

scholarly journals DARK ENERGY DENSITY IN MODELS WITH SPLIT SUPERSYMMETRY AND DEGENERATE VACUA

2012 ◽  
Vol 27 (11) ◽  
pp. 1250063 ◽  
Author(s):  
C. FROGGATT ◽  
R. NEVZOROV ◽  
H. B. NIELSEN
Keyword(s):  
Dark Energy ◽  
Energy Density ◽  
Cosmological Constant ◽  
Vacuum Energy ◽  
Susy Breaking ◽  
Vacuum Energy Density ◽  
Dark Energy Density ◽  
Hidden Sector ◽  
Split Supersymmetry ◽  
Breaking Scale

In N = 1 supergravity supersymmetric and nonsupersymmetric Minkowski vacua originating in the hidden sector can be degenerate. In the supersymmetric phase in flat Minkowski space, nonperturbative supersymmetry breakdown may take place in the observable sector, inducing a nonzero and positive vacuum energy density. Assuming that such a supersymmetric phase and the phase in which we live are degenerate, we estimate the value of the cosmological constant. We argue that the observed value of the dark energy density can be reproduced in the split SUSY scenario of SUSY breaking if the SUSY breaking scale is of order of 1010 GeV.

scholarly journals SOFT LEPTOGENESIS AND GRAVITINO DARK MATTER IN GAUGE MEDIATION

2011 ◽  
Vol 20 (08) ◽  
pp. 1533-1538
Author(s):  
KOICHI HAMAGUCHI ◽  
N. YOKOZAKI
Keyword(s):  
Dark Matter ◽  
Baryon Asymmetry ◽  
Susy Breaking ◽  
Gauge Mediation ◽  
Susy Particle ◽  
The Universe

In gauge mediated SUSY breaking models, the gravitino is generally the lightest SUSY particle and can be a candidate for a dark matter. However the viable abundance of the gravitino requires rather low reheating temparature. With this low reheating temparature, it is difficult to explain the baryon asymmetry of the universe with thermal leptogenesis. We consider the extended scenario of the gauge mediation, which generates A-terms. In this extended scenario, soft leptogenesis works successfully with the low reheating temperature. Therefore we can explain the baryon asymmetry and gravitino dark matter simultaneously.

scholarly journals Magnetic dipole moment and keV neutrino dark matter

2012 ◽  
Vol 710 (2) ◽  
pp. 324-327 ◽  
Author(s):  
Chao-Qiang Geng ◽  
Ryo Takahashi
Keyword(s):  
Dark Matter ◽  
Dipole Moment ◽  
Magnetic Dipole ◽  
Magnetic Dipole Moment

scholarly journals Supergravity Model of Inflation and Explaining IceCube HESE Data via PeV Dark Matter Decay

2020 ◽  
Vol 2020 ◽  
pp. 1-14
Author(s):  
Girish Kumar Chakravarty ◽  
Najimuddin Khan ◽  
Subhendra Mohanty
Keyword(s):  
Dark Matter ◽  
Scalar Field ◽  
Neutrino Flux ◽  
Gauge Coupling ◽  
Susy Breaking ◽  
Particle Spectrum ◽  
Energy Particle ◽  
Hidden Sector ◽  
Kähler Potential ◽  
Gut Scale

We construct a unified model of inflation and PeV dark matter with an appropriate choice of no-scale Kähler potential, superpotential, and gauge kinetic function in terms of MSSM fields and hidden sector Polonyi field. The model is consistent with the CMB observations and can explain the PeV neutrino flux observed at IceCube HESE. A Starobinsky-like Higgs-sneutrino plateau inflation is obtained from the D-term SUGRA potential while F-term being subdominant during inflation. To get PeV dark matter, SUSY breaking at PeV scale is achieved through Polonyi field. This sets the scale for soft SUSY breaking parameters m0,m1/2,A0 at the GUT scale in terms of the parameters of the model. The low-energy particle spectrum is obtained by running the RGEs. We show that the ~125 GeV Higgs and the gauge coupling unification can be obtained in this model. The 6 PeV bino-type dark matter is a subdominant fraction (~11%) of the relic density, and its decay gives the PeV scale neutrino flux observed at IceCube by appropriately choosing the couplings of the R-parity violating operators. Also, we find that there is degeneracy in scalar field parameters γ,β and coupling ζ value in producing the correct amplitude of CMB power spectrum. However, the value of parameter tanβ=1.8, which is tightly fixed from the requirement of PeV scale SUSY breaking, removes the degeneracy in the values of the scalar field parameters to provide a unique solution for inflation. In this way, it brings the explanation for dark matter, PeV neutrinos, and inflation within the same framework.

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