scholarly journals Interacting dark sector: Lagrangian formulation based on two canonical scalar fields

2021 ◽  
Vol 104 (8) ◽  
Author(s):  
Grigoris Panotopoulos ◽  
Ilídio Lopes
Keyword(s):  
Scalar Fields ◽  
Lagrangian Formulation ◽  
Dark Sector

A new pressure-parametric cosmological model

2020 ◽  
Vol 35 (25) ◽  
pp. 2050209
Author(s):  
Yan-Hong Yao ◽  
Xin-He Meng
Keyword(s):  
Scalar Fields ◽  
Model Parameters ◽  
Acoustic Oscillations ◽  
Dark Sector ◽  
Type Ia ◽  
Phantom Scalar ◽  
Acceleration Of The Universe ◽  
Expansion Of The Universe ◽  
Ia Supernovae ◽  
The Universe

We put forward a pressure-parametric model to study the tiny deviation from cosmological constant(CC) behavior of the dark sector accelerating the expansion of the Universe. Data from cosmic microwave background (CMB) anisotropies, baryonic acoustic oscillations (BAO), Type Ia supernovae (SN Ia) observation are applied to constrict the model parameters. The constraint results show that such model suffers with [Formula: see text] tension as well. To realize this model more physically, we reconstruct it with the quintessence and phantom scalar fields, and find out that although the model predicts a quintessence-induced acceleration of the Universe at past and present, at some moment of the future, dark energy’s density have a disposition to increase.

scholarly journals Disformal scalar fields and the dark sector of the universe

2010 ◽  
Vol 2010 (05) ◽  
pp. 038-038 ◽  
Author(s):  
M Zumalacárregui ◽  
T.S Koivisto ◽  
D.F Mota ◽  
P Ruiz-Lapuente
Keyword(s):  
Scalar Fields ◽  
Dark Sector ◽  
The Universe

scholarly journals ACCRETION OF NONMINIMALLY COUPLED GENERALIZED CHAPLYGIN GAS INTO BLACK HOLES

2012 ◽  
Vol 21 (09) ◽  
pp. 1250075 ◽  
Author(s):  
M. G. RODRIGUES ◽  
A. E. BERNARDINI
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Scalar Fields ◽  
Chaplygin Gas ◽  
Nonminimal Coupling ◽  
Dark Sector ◽  
Generalized Chaplygin Gas ◽  
Expansion Of The Universe ◽  
Cosmological Scalar ◽  
Black Hole Masses

The mass evolution of Schwarzschild black holes by the absorption of scalar fields is investigated in the scenario of the generalized Chaplygin gas (GCG). The GCG works as a unification picture of dark matter plus dark energy that naturally accelerates the expansion of the Universe. Through elements of the quasi-stationary approach, we consider the mass evolution of Schwarzschild black holes accreted by nonminimally coupled cosmological scalar fields reproducing the dynamics of the GCG. As a scalar field nonminimally coupled to the metrics, such an exotic content has been interconnected with accreting black holes. The black hole increasing masses by the absorption of the gas reflects some consistence of the accretion mechanism with the hypothesis of the primordial origin of supermassive black holes. Our results effectively show that the nonminimal coupling with the GCG dark sector accelerates the increasing of black hole masses. Meanwhile some exotic features can also be depicted for specific ranges of the nonminimal coupling in which the GCG dynamics is substantially modified.

scholarly journals Vector dark matter from a gauged SU(2) symmetry

2021 ◽  
Vol 2021 (6) ◽  
Author(s):  
Takaaki Nomura ◽  
Hiroshi Okada ◽  
Seokhoon Yun
Keyword(s):  
Dark Matter ◽  
Group Representation ◽  
Vacuum Expectation ◽  
Vacuum Expectation Value ◽  
Scalar Fields ◽  
Mass Relation ◽  
Dark Sector ◽  
Dark Matter Annihilation ◽  
Gauge Bosons ◽  
General Mass

Abstract We propose a scenario of dark sector described by a hidden SU(2) gauge symmetry which is broken by a vacuum expectation value(VEV) of a scalar multiplet. We discuss a general mass relation among SU(2) gauge bosons after spontaneous symmetry breaking which is determined by weight of gauge group representation associated with a scalar multiplet developing VEV. Then a model with quintet and triplet scalar fields is discussed in which hidden gauge boson can be dark matter(DM) stabilized by remnant discrete Z2 symmetry and resonant dark matter annihilation is realized by mass relation between DM and mediator. We estimate relic density and spin independent DM-nucleon scattering cross section searching for allowed parameter region.

scholarly journals The dark sector from interacting canonical and non-canonical scalar fields

2010 ◽  
Vol 27 (17) ◽  
pp. 175006 ◽  
Author(s):  
Rudinei C de Souza ◽  
Gilberto M Kremer
Keyword(s):  
Scalar Fields ◽  
Dark Sector

scholarly journals Dark Sector in Cosmology: Dark Energy on Cosmological and Astrophysical Scales

2019 ◽  
Vol 64 (11) ◽  
pp. 998 ◽  
Author(s):  
B. Novosyadlyj
Keyword(s):  
Dark Energy ◽  
Scalar Fields ◽  
Dark Sector ◽  
Gravitational Fields ◽  
Current State ◽  
Astrophysical Objects ◽  
Phantom Scalar ◽  
Expansion Of The Universe ◽  
The Universe ◽  
Dynamical Dark Energy

The properties and observational manifestations of the dynamical dark energy on the cosmological and astrophysical scales are discussed. We consider the dynamical dark energy in the form of quintessential and phantom scalar fields with different parameters of the equation of state and the effective sound speed. The evolution of the dynamical dark energy and its impact on the dynamics of expansion of the Universe, halos, and voids, and its behavior in the static gravitational fields of astrophysical objects are analyzed. The current state and possible tests designed to establish the nature of dark energy are highlighted.

scholarly journals Light dark matter from dark sector decay

2021 ◽  
Vol 815 ◽  
pp. 136118
Author(s):  
Yu Cheng ◽  
Wei Liao
Keyword(s):  
Dark Matter ◽  
Dark Sector

scholarly journals New AdS4 vacua in dyonic ISO(7) gauged supergravity

2021 ◽  
Vol 2021 (2) ◽  
Author(s):  
Nikolay Bobev ◽  
Thomas Fischbacher ◽  
Fridrik Freyr Gautason ◽  
Krzysztof Pilch
Keyword(s):  
Scalar Fields ◽  
Global Symmetry ◽  
Supergravity Theory

Abstract We identify 219 AdS4 solutions in four-dimensional dyonically gauged ISO(7) $$ \mathcal{N} $$ N = 8 supergravity and present some of their properties. One of the new solutions preserves $$ \mathcal{N} $$ N = 1 supersymmetry and provides a rare explicit example of an AdS4 vacuum dual to a 3d SCFT with no continuous global symmetry. There are also two new non-supersymmetric solutions for which all 70 scalar fields in the supergravity theory have masses above the BF bound. All of these AdS4 solutions can be uplifted to massive type IIA supergravity. Motivated by this we present the low lying operator spectra of the dual 3d CFTs for all known supersymmetric AdS4 solutions in the theory and organize them into superconformal multiplets.

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