149 research outputs found
Extension of Minimal Fermionic Dark Matter Model : A Study with Two Higgs Doublet Model
We explore a fermionic dark matter model with a possible extension of
Standard Model (SM) of particle physics into two Higgs doublet model. Higgs
doublets couple to the singlet fermionic dark matter (FDM) through a non
renormalisable coupling providing a new physics scale. We explore the viability
of such dark matter candidate and constrain the model parameter space by
collider serach, relic density of DM, direct detection measurements of
DM-nucleon scattreing cross-section and with the experimentally obtained
results from indirect search of dark matter.Comment: 22 pages, 17 new png figures, Title changed, new references added,
major revisio
Possible explanation of indirect gamma ray signatures from hidden sector fermionic dark matter
We propose the existence of a hidden or dark sector besides the standard
model (SM) of particle physics, whose members (both fermionic and bosonic) obey
a local SU(2) gauge symmetry while behaving like a singlet under the
SM gauge group. However, the fermiomic fields of the dark sector also possess
another global U(1) symmetry which remains unbroken. The local
SU(2) invariance of the dark sector is broken spontaneously when a
scalar field in this sector acquires a vacuum expectation value (VEV) and
thereby generating masses to the dark gauge bosons and dark fermions charged
under the SU(2). The lightest fermion in this dark SU(2)
sector can be a potential dark matter candidate. We first examine the viability
of the model and constrain the model parameter space by theoretical constraints
such as vacuum stability and by the experimental constraints such as PLANCK
limit on relic density, LHC data, limits on spin independent scattering
cross-section from dark matter direct search experiments etc. We then
investigate the gamma rays from the pair annihilation of the proposed dark
matter candidate at the Galactic Centre region. We also extend our calculations
of gamma rays flux for the case of dwarf galaxies and compare the signatures of
gamma rays obtained from these astrophysical sites.Comment: 33 pages, 16 figures, title changed, major revisio
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Multi-Direction Layered Deposition: An Overview of Process Planning Methodologies
Layered Manufacturing (LM) techniques build a part by adding thin layers of material. In many LM
processes overhangs require the deposition of sacrificial supports resulting in an increase in the
build time, wastage of material and costly post-processing. This has led to the development of LM
systems which can deposit material along multiple directions and eliminate the need for supports.
We survey the configurations of available multi-direction deposition systems. An overview of the
process planning challenges is presented. Literature on process planning methodologies is
reviewed.Mechanical Engineerin
Two component WIMP-FImP dark matter model with singlet fermion, scalar and pseudo scalar
We explore a two component dark matter model with a fermion and a scalar. In
this scenario the Standard Model (SM) is extended by a fermion, a scalar and an
additional pseudo scalar. The fermionic component is assumed to have a global
and interacts with the pseudo scalar via Yukawa
interaction while a symmetry is imposed on the other component
-- the scalar. These ensure the stability of both the dark matter components.
Although the Lagrangian of the present model is CP conserving, however the CP
symmetry breaks spontaneously when the pseudo scalar acquires a vacuum
expectation value (VEV). The scalar component of the dark matter in the present
model also develops a VEV on spontaneous breaking of the
symmetry. Thus the various interactions of the dark sector and the SM sector
are progressed through the mixing of the SM like Higgs boson, the pseudo scalar
Higgs like boson and the singlet scalar boson. We show that the observed gamma
ray excess from the Galactic Centre, self-interaction of dark matter from
colliding clusters as well as the 3.55 keV X-ray line from Perseus, Andromeda
etc. can be simultaneously explained in the present two component dark matter
model.Comment: 35 pages, 5 figure
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