scholarly journals Minimal two-component scalar doublet dark matter with radiative neutrino mass

2019 ◽  
Vol 100 (5) ◽  
Author(s):  
Debasish Borah ◽  
Rishav Roshan ◽  
Arunansu Sil
Keyword(s):  
Dark Matter ◽  
Neutrino Mass ◽  
Two Component

scholarly journals Two component dark matter with inert Higgs doublet: neutrino mass, high scale validity and collider searches

2020 ◽  
Vol 2020 (3) ◽  
Author(s):  
Subhaditya Bhattacharya ◽  
Purusottam Ghosh ◽  
Abhijit Kumar Saha ◽  
Arunansu Sil
Keyword(s):  
Dark Matter ◽  
Neutrino Mass ◽  
Higgs Doublet ◽  
High Scale ◽  
Scale Validity ◽  
Two Component

scholarly journals Two-component galaxy models with a central BH – II. The ellipsoidal case

2020 ◽  
Vol 500 (1) ◽  
pp. 1054-1070
Author(s):  
Luca Ciotti ◽  
Antonio Mancino ◽  
Silvia Pellegrini ◽  
Azadeh Ziaee Lorzad
Keyword(s):  
Dark Matter ◽  
Stellar Dynamics ◽  
Azimuthal Velocity ◽  
Dark Matter Halo ◽  
Gas Flows ◽  
Total Density ◽  
Density Distributions ◽  
Stellar Component ◽  
Two Component ◽  
Analytical Formulae

ABSTRACT Recently, two-component spherical galaxy models have been presented, where the stellar profile is described by a Jaffe law, and the total density by another Jaffe law, or by an r−3 law at large radii. We extend these two families to their ellipsoidal axisymmetric counterparts: the JJe and J3e models. The total and stellar density distributions can have different flattenings and scale lengths, and the dark matter halo is defined by difference. First, the analytical conditions required to have a nowhere negative dark matter halo density are derived. The Jeans equations for the stellar component are then solved analytically, in the limit of small flattenings, also in the presence of a central BH. The azimuthal velocity dispersion anisotropy is described by the Satoh k-decomposition. Finally, we present the analytical formulae for velocity fields near the centre and at large radii, together with the various terms entering the virial theorem. The JJe and J3e models can be useful in a number of theoretical applications, e.g. to explore the role of the various parameters (flattening, relative scale lengths, mass ratios, rotational support) in determining the behaviour of the stellar kinematical fields before performing more time-expensive integrations with specific galaxy models, to test codes of stellar dynamics and in numerical simulations of gas flows in galaxies.

scholarly journals Exothermic dark matter for XENON1T excess

2021 ◽  
Vol 2021 (1) ◽  
Author(s):  
Hyun Min Lee
Keyword(s):  
Dark Matter ◽  
Mass Difference ◽  
Mass Splitting ◽  
Effective Theory ◽  
Recoil Energy ◽  
Detector Resolution ◽  
Atomic Excitation ◽  
Microscopic Models ◽  
Electron Recoil ◽  
Two Component

Abstract Motivated by the recent excess in the electron recoil from XENON1T experiment, we consider the possibility of exothermic dark matter, which is composed of two states with mass splitting. The heavier state down-scatters off the electron into the lighter state, making an appropriate recoil energy required for the Xenon excess even for the standard Maxwellian velocity distribution of dark matter. Accordingly, we determine the mass difference between two component states of dark matter to the peak electron recoil energy at about 2.5 keV up to the detector resolution, accounting for the recoil events over ER = 2 − 3 keV, which are most significant. We include the effects of the phase-space enhancement and the atomic excitation factor to calculate the required scattering cross section for the Xenon excess. We discuss the implications of dark matter interactions in the effective theory for exothermic dark matter and a massive Z′ mediator and provide microscopic models realizing the required dark matter and electron couplings to Z′.

scholarly journals Dark matter as the origin of neutrino mass in the inverse seesaw mechanism

2021 ◽  
pp. 136609
Author(s):  
Sanjoy Mandal ◽  
Nicolás Rojas ◽  
Rahul Srivastava ◽  
José W.F. Valle
Keyword(s):  
Dark Matter ◽  
Neutrino Mass ◽  
Seesaw Mechanism

scholarly journals Scale-invariant models with one-loop neutrino mass and dark matter candidates

2016 ◽  
Vol 94 (5) ◽  
Author(s):  
Amine Ahriche ◽  
Adrian Manning ◽  
Kristian L. McDonald ◽  
Salah Nasri
Keyword(s):  
Dark Matter ◽  
Neutrino Mass ◽  
Scale Invariant

scholarly journals Two-component axionic dark matter halos

2020 ◽  
Vol 35 (26) ◽  
pp. 2050227 ◽  
Author(s):  
Gennady P. Berman ◽  
Vyacheslav N. Gorshkov ◽  
Vladimir I. Tsifrinovich ◽  
Marco Merkli ◽  
Vladimir V. Tereshchuk
Keyword(s):  
Dark Matter ◽  
Ground State ◽  
Mass Density ◽  
Mean Field ◽  
Einstein Condensate ◽  
Dark Matter Halo ◽  
Bose Einstein Condensate ◽  
Interesting Connection ◽  
Two Component ◽  
Bose Einstein

We consider a two-component dark matter halo (DMH) of a galaxy containing ultra-light axions (ULA) of different mass. The DMH is described as a Bose–Einstein condensate (BEC) in its ground state. In the mean-field (MF) limit, we have derived the integro-differential equations for the spherically symmetrical wave functions of the two DMH components. We studied, numerically, the radial distribution of the mass density of ULA and constructed the parameters which could be used to distinguish between the two- and one-component DMH. We also discuss an interesting connection between the BEC ground state of a one-component DMH and Black Hole temperature and entropy, and Unruh temperature.

scholarly journals Radiative scaling neutrino mass and warm dark matter

2012 ◽  
Vol 717 (1-3) ◽  
pp. 235-237 ◽  
Author(s):  
Ernest Ma
Keyword(s):  
Dark Matter ◽  
Neutrino Mass
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