178 research outputs found
On the smallness of the cosmological constant in SUGRA models
In no--scale supergravity global symmetries protect local supersymmetry and a
zero value for the cosmological constant. We consider the breakdown of these
symmetries and present a minimal SUGRA model motivated by the multiple point
principle, in which the total vacuum energy density is naturally tiny. In order
to reproduce the observed value of the cosmological constant and preserve gauge
coupling unification, an additional pair of --plets of superfields
has to be included in the particle content of the considered model. These extra
fields have masses of the order of the supersymmetry breaking scale; so they
can be detected at future colliders. We also discuss the supersymmetry
breakdown and possible solution of the cosmological constant problem by MPP in
models with an enlarged gauge symmetry.Comment: 28 pages, 3 figures, some minor changes to the text, references adde
On the Smallness of the Cosmological Constant in SUGRA Models Inspired by Degenerate Vacua
In the no-scale supergravity global symmetries protect local supersymmetry
and a zero value for the cosmological constant. The breakdown of these
symmetries, which ensures the vanishing of the vacuum energy density, results
in a set of degenerate vacua with broken and unbroken supersymmetry leading to
the natural realisation of the multiple point principle (MPP). In the MPP
inspired SUGRA models the cosmological constant is naturally tiny.Comment: Parallel talk at SUSY09, Boston, USA, June 2009, 5 page
Multiple point principle as a mechanism for the suppression of FCNC and CP--violation phenomena in the 2HDM
We argue that multiple point principle (MPP) can be used to ensure CP
conservation and the absence of flavour changing neutral currents within the
two Higgs doublet model (2HDM). We also discuss Higgs phenomenology in the MPP
inspired 2HDM.Comment: Submitted for the SUSY07 proceedings, 4 pages, LaTeX, 2 eps
figures,CERN preprint number added, references update
Particle spectrum in modified NMSSM
The restrictions on the lightest Higgs boson mass in the minimal
supersymmetric models are briefly reviewed. The particle spectrum is considered
in the framework of the simplest modification of NMSSM that allows to avoid the
domain wall problem and to get the self--consistent solution in the strong
Yukawa coupling limit. The lightest Higgs boson mass in the investigated model
can reach at values of and does not exceed
.Comment: 4 pages, LaTeX2e. Talk given at the SUSY 2001 Conference in JINR,
Dubna, Russi
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