Results 81 to 90 of about 143,913 (244)

Unifying dark energy and dark matter with a scalar field [PDF]

EAS Publications Series, 2006
The standard model of cosmology considers the existence of two components of unknown nature, ``dark matter'' and ``dark energy'', which determine the cosmological evolution. Their nature remains unknown, and other models can also be considered. In particular, it may be possible to reinterpret the recent cosmological observations so that the Universe ...
openaire   +3 more sources

Structure formation with scalar field dark matter: the field approach [PDF]

Journal of Cosmology and Astroparticle Physics, 2012
We study the formation of structure in the Universe assuming that dark matter can be described by a scalar field $\tilde $ with a potential $V( )=-\mathfrak{m}^{2}\tilde ^{2}/2+ \tilde ^4/4$. We derive the evolution equations of the scalar field in the linear regime of perturbations.
Tonatiuh Matos, Abril Suárez, Juan Magaña, F.J. Sánchez-Salcedo   +3 more
openaire   +3 more sources

Irreversible thermodynamic description of interacting dark energy - dark matter cosmological models

, 2013
We investigate the interaction between dark energy and dark matter in the framework of irreversible thermodynamics of open systems with matter creation/annihilation.
Harko, Tiberiu, Lobo, Francisco S. N.
core   +1 more source

Effects of dark matter on the spontaneous scalarization in neutron stars

European Physical Journal C: Particles and Fields
Dark matter, an important portion of compact objects, can influence different phenomena in neutron stars. The spontaneous scalarization in the scalar-tensor gravity has been proposed for neutron stars.
Fahimeh Rahimi, Zeinab Rezaei
doaj   +1 more source

$\phi^2$ as Dark Matter

, 2008
In this paper we consider $\phi^2$ scalar field potential as a candidate to dark matter. If it is an ultralight boson particle, it condensates like a Bose-Einstein system at very early times and forms the basic structure of the Universe.
Alberto Vázquez-González, Alcubierre, Arbey, Arbey, Bernal, Bernal, Bertacca, Cimatti, de Blok, de Blok, Guzmán, Guzmán, Guzmán, Guzmán, Guzmán, Ji, Juan Magaña, Kolb, Lee, Lesgourgues, Liddle, Madsen, Matos, Matos, Matos, Matos, Matos, Matos, Matos, Padmanabhan, Peebles, Peebles, Peebles, Press, Pérez-Lorenzana, Ruffini, Seidel, Seidel, Simon, Sin, Sánchez-Salcedo, Tonatiuh Matos, Turner, Ureña-López   +43 more
core   +1 more source

The quantum character of the Scalar Field Dark Matter

Monthly Notices of the Royal Astronomical Society, 2022
ABSTRACT The scalar field dark matter (SFDM) model, also called Fuzzy, Wave, Bose–Einstein, and Ultra-light Dark Matter, has received a lot of attention because it has been able to provide simpler and more natural explanations for various features of galaxies, such as the number of satellite galaxies and the cusp-core problem.
openaire   +2 more sources

Interacting quintessence in light of generalized uncertainty principle: cosmological perturbations and dynamics

European Physical Journal C: Particles and Fields, 2021
We consider a cosmological scenario endowed with an interaction between the universe’s dark components – dark matter and dark energy. Specifically, we assume the dark matter component to be a pressure-less fluid, while the dark energy component is a ...
Andronikos Paliathanasis, Genly Leon, Wompherdeiki Khyllep, Jibitesh Dutta, Supriya Pan   +4 more
doaj   +1 more source

A two measure model of dark energy and dark matter

, 2012
In this work we construct a unified model of dark energy and dark matter. This is done with the following three elements: a gravitating scalar field, phi with a non-conventional kinetic term, as in the string theory tachyon; an arbitrary potential, V(phi)
Douglas Singleton, E. Bergshoeff, E. Guendelman, E. Guendelman, E.A. Lim, Eduardo Guendelman, N Yongram, S. Ansoldi, S. del Campo, Supernova Cosmology Project collaboration, Supernova Search Team collaboration, U. Alam, V. Sahni   +12 more
core   +1 more source

Comments on Unified dark energy and dark matter from a scalar field different from quintessence [PDF]

, 2010
In a recent paper by C. Gao, M. Kunz, A. Liddle and D. Parkinson [arXiv:0912.0949], the unification of dark matter and dark energy was explored within a theory containing a scalar field of non-Lagrangian type.
Chimento, Luis P., Forte, Mónica
core   +2 more sources

A new recipe for $$\Lambda $$ Λ CDM

European Physical Journal C: Particles and Fields, 2017
It is well known that a canonical scalar field is able to describe either dark matter or dark energy but not both. We demonstrate that a non-canonical scalar field can describe both dark matter and dark energy within a unified setting.
Varun Sahni, Anjan A. Sen
doaj   +1 more source