scholarly journals Gravitational dynamics in the toy model of the Higgs-dark matter sector: the field theoretic perspective

2020 ◽  
Vol 80 (11) ◽  
Author(s):  
Anna Nakonieczna ◽  
Łukasz Nakonieczny
Keyword(s):  
Black Holes ◽  
Dark Matter ◽  
Mass Parameter ◽  
Apparent Horizon ◽  
Higgs Field ◽  
Radial Pressure ◽  
Model Parameters ◽  
Complex Scalar ◽  
Matter Sector ◽  
Scalar Gravity

AbstractThe objective of the paper was to examine gravitational evolutions in the Higgs-dark matter sector toy model. The real part of the Higgs doublet was modelled by a neutral scalar. Two dark matter candidates introduced were the dark photon and a charged complex scalar. Non-minimal couplings of both scalars to gravity were included. The coupling channels between the ordinary and dark matter sectors were kinetic mixing between the electromagnetic and dark U(1) fields and the Higgs portal coupling among the scalars. The structures of emerging singular spacetimes were either of Schwarzschild or Reissner–Nordström types. The non-minimal scalar–gravity couplings led to an appearance of timelike portions of apparent horizons where they transform from spacelike to null. The features of dynamical black holes were described as functions of the model parameters. The black holes formed later and their radii and masses were smaller as the mass parameter of the complex scalar increased. The dependencies on the coupling of the Higgs field to gravity exhibited extrema, which were a maximum for the time of the black holes formation and minima in the cases of their radii and masses. A set of quantities associated with an observer moving with the evolving matter was proposed. The energy density, radial pressure and pressure anisotropy within dynamical spacetimes get bigger as the singularity is approached. The increase is more considerable in the Reissner–Nordström spacetimes. The apparent horizon local temperature changes monotonically in the minimally coupled case and non-monotonically when non-minimal scalar–gravity couplings are involved.

scholarly journals Fuzzy dark matter black holes and droplets

2021 ◽  
Vol 81 (8) ◽  
Author(s):  
D. Batic ◽  
D. Asem Abuhejleh ◽  
M. Nowakowski
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Dark Matter ◽  
Black Hole Solution ◽  
Mass Parameter ◽  
Radial Pressure ◽  
Momentum Tensor ◽  
Anisotropic Fluid ◽  
De Sitter ◽  
Hole Model

AbstractWe consider the possibility of having Dark Matter (DM) black holes motivated by the Einasto density profile. This generalizes both the noncommutative mini black hole model and allows DM to enter as the matter constituent which makes up the black hole. We show that it is possible to construct a black hole solution for each value of the Einasto index and for different values of the mass parameter, provided that the we work with the energy–momentum tensor of an anisotropic fluid. In particular, we achieve that by first considering the equation of state (EOS) $$p_r=-\rho $$ p r = - ρ . It turns out that the corresponding black hole solution exhibits a horizon structure similar to that of a Reissner–Nordström black hole and the central singularity is replaced by a regular de Sitter core. We also show that if the previous EOS is replaced by a nonlocal one, it is possible to construct a self-gravitating fuzzy DM droplet but also in this case, the radial pressure is negative. Finally, we contemplate scenarios of different dark matter black holes with moderate mass values which could have formed in galaxies. In particular, we probe the possibility whether such black holes could also be the central galactic objects.

scholarly journals COMPLEX SCALAR FIELD DARK MATTER ON GALACTIC SCALES

2014 ◽  
Vol 29 (02) ◽  
pp. 1430002 ◽  
Author(s):  
TANJA RINDLER-DALLER ◽  
PAUL R. SHAPIRO
Keyword(s):  
Dark Matter ◽  
Scalar Field ◽  
Early Universe ◽  
Einstein Condensate ◽  
Model Parameters ◽  
Galactic Halos ◽  
Complex Scalar ◽  
Bose Einstein Condensate ◽  
Complex Scalar Field ◽  
Bose Einstein

The nature of the cosmological dark matter (DM) remains elusive. Recent studies have advocated the possibility that DM could be composed of ultra-light, self-interacting bosons, forming a Bose–Einstein condensate (BEC) in the very early Universe. We consider models which are charged under a global U(1)-symmetry such that the DM number is conserved. It can then be described as a classical complex scalar field which evolves in an expanding Universe. We present a brief review on the bounds on the model parameters from cosmological and galactic observations, along with the properties of galactic halos which result from such a DM candidate.

scholarly journals Constraints on primordial black hole dark matter from Galactic center X-ray observations

2018 ◽  
Vol 618 ◽  
pp. A139 ◽  
Author(s):  
Andi Hektor ◽  
Gert Hütsi ◽  
Martti Raidal
Keyword(s):  
Black Holes ◽  
Dark Matter ◽  
Gravitational Wave ◽  
Galactic Center ◽  
Model Parameters ◽  
Primordial Black Hole ◽  
Density Profiles ◽  
X Ray ◽  
Wave Measurements ◽  
Gas Accretion

Context. Surprisingly high masses of the black holes inferred from the Laser Interferometer Gravitational-Wave Observatory (LIGO) and Virgo gravitational wave measurements have lead to speculations that the observed mergers might be due to 𝒪(10) M⊙ primordial black holes (PBHs). Furthermore, it has been suggested that the whole amount of dark matter (DM) might be in that exotic form. Aims. We investigate constraints on the PBH DM using NuSTAR Galactic center (GC) X-ray data. Methods. We used a robust Monte Carlo approach in conjunction with a radiatively inefficient PBH accretion model with commonly accepted model parameters. Compared to previous studies we allowed for multiple forms of DM density profiles. Most importantly, our study includes treatment of the gas turbulence, which significantly modifies the relative velocity between PBHs and gas. Results. We show that inclusion of the effects of gas turbulence and the uncertainties related to the DM density profile reduces significantly the gas accretion onto PBHs compared to the claimed values in previous papers. It is highly improbable to obtain accreting PBHs brighter than the NuSTAR point source limit using observationally determined gas velocities. Conclusions. One can safely conclude that GC X-ray observations cannot rule out 𝒪(10) M⊙ PBH DM.

scholarly journals Primordial black holes as dark matter through Higgs field criticality

2020 ◽  
Vol 101 (12) ◽  
Author(s):  
Samuel Passaglia ◽  
Wayne Hu ◽  
Hayato Motohashi
Keyword(s):  
Black Holes ◽  
Dark Matter ◽  
Higgs Field ◽  
Primordial Black Holes

QUASI-SPHERICAL STAR OF DARK MATTER AND DARK ENERGY AND A STUDY OF ITS COLLAPSE DYNAMICS

2007 ◽  
Vol 22 (37) ◽  
pp. 2839-2854 ◽  
Author(s):  
TANWI BANDYOPADHYAY ◽  
SUBENOY CHAKRABORTY
Keyword(s):  
Dark Matter ◽  
Dark Energy ◽  
Gravitational Collapse ◽  
Apparent Horizon ◽  
Dust Cloud ◽  
Radial Pressure ◽  
Anisotropic Fluid ◽  
Usual Form

The collapse dynamics of an inhomogeneous quasi-spherical star is investigated in the background of dark matter (DM) and dark energy (DE). The dark matter is taken in the usual form of dust cloud and for dark energy, anisotropic fluid is chosen. The gravitational collapse is studied in two different situations: (a) a simple choice of the metric coefficient, (b) the radial pressure is assumed to be zero. The role of dark energy in the formation of apparent horizon is studied and it is examined how dark energy modifies the collapsing process.

scholarly journals Wave Function for the Reissner–Nordström Black Hole

1997 ◽  
Vol 12 (20) ◽  
pp. 1491-1505 ◽  
Author(s):  
P. V. Moniz
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Wave Function ◽  
Scalar Field ◽  
Hawking Radiation ◽  
Apparent Horizon ◽  
Complex Scalar ◽  
Charge Rate ◽  
Quantum Behavior ◽  
Complex Scalar Field

We study the quantum behavior of Reissner–Nordström (RN) black holes interacting with a complex scalar field. A Maxwell field is also present. Our analysis is based on M. Pollock's1 method and is characterized by solving a Wheeler–DeWitt equation in the proximity of an apparent horizon of the RN space–time. Subsequently, we obtain a wave function Ψ RN [M,Q] representing the RN black hole when its charge, |Q|, is small in comparison with its mass, M. We then compare quantum-mechanically the cases of (i) Q=0 and (ii) M≥|Q|≠0. A special emphasis is given to the evolution of the mass-charge rate affected by Hawking radiation.

scholarly journals Kinetic mixing, dark photons and extra dimensions. Part III. Brane localized dark matter

2021 ◽  
Vol 2021 (3) ◽  
Author(s):  
Thomas G. Rizzo ◽  
George N. Wojcik
Keyword(s):  
Dark Matter ◽  
Extra Dimensions ◽  
Model Building ◽  
New Physics ◽  
Model Complexity ◽  
Complex Scalar ◽  
Dark Photon ◽  
Complex Models ◽  
The Cost ◽  
D Model

Abstract Extra dimensions have proven to be a very useful tool in constructing new physics models. In earlier work, we began investigating toy models for the 5-D analog of the kinetic mixing/vector portal scenario where the interactions of dark matter, taken to be, e.g., a complex scalar, with the brane-localized fields of the Standard Model (SM) are mediated by a massive U(1)D dark photon living in the bulk. These models were shown to have many novel features differentiating them from their 4-D analogs and which, in several cases, avoided some well-known 4-D model building constraints. However, these gains were obtained at the cost of the introduction of a fair amount of model complexity, e.g., dark matter Kaluza-Klein excitations. In the present paper, we consider an alternative setup wherein the dark matter and the dark Higgs, responsible for U(1)D breaking, are both localized to the ‘dark’ brane at the opposite end of the 5-D interval from where the SM fields are located with only the dark photon now being a 5-D field. The phenomenology of such a setup is explored for both flat and warped extra dimensions and compared to the previous more complex models.

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