Gravitino dark matter and cosmological constraints

2009 ◽  
Author(s):  
Ki-Young Choi ◽  
Csaba Balazs ◽  
Fei Wang
Keyword(s):  
Dark Matter ◽  
Cosmological Constraints

scholarly journals INTERACTION BETWEEN DARK ENERGY AND DARK MATTER: OBSERVATIONAL CONSTRAINTS FROM OHD, BAO, CMB AND SNe Ia

2013 ◽  
Vol 22 (14) ◽  
pp. 1350082 ◽  
Author(s):  
SHUO CAO ◽  
NAN LIANG
Keyword(s):  
Dark Matter ◽  
Dark Energy ◽  
Observational Constraints ◽  
Coincidence Problem ◽  
Cosmological Constraints ◽  
Coincidence Index ◽  
Acceleration Of The Universe ◽  
Interaction Term ◽  
Negative Coupling ◽  
The Universe

In order to test if there is energy transfer between dark energy (DE) and dark matter (DM), we investigate cosmological constraints on two forms of nontrivial interaction between the DM sector and the sector responsible for the acceleration of the universe, in light of the newly revised observations including OHD, CMB, BAO and SNe Ia. More precisely, we find the same tendencies for both phenomenological forms of the interaction term Q = 3γHρ, i.e. the parameter γ to be a small number, |γ| ≈ 10-2. However, concerning the sign of the interaction parameter, we observe that γ > 0 when the interaction between dark sectors is proportional to the energy density of dust matter, whereas the negative coupling (γ < 0) is preferred by observations when the interaction term is proportional to DE density. We further discuss two possible explanations to this incompatibility and apply a quantitative criteria to judge the severity of the coincidence problem. Results suggest that the γm IDE model with a positive coupling may alleviate the coincidence problem, since its coincidence index C is smaller than that for the γd IDE model, the interacting quintessence and phantom models by four orders of magnitude.

scholarly journals Cosmological constraints on multi-interacting dark matter

2021 ◽  
Vol 2021 (02) ◽  
pp. 019-019
Author(s):  
Niklas Becker ◽  
Deanna C. Hooper ◽  
Felix Kahlhoefer ◽  
Julien Lesgourgues ◽  
Nils Schöneberg
Keyword(s):  
Dark Matter ◽  
Cosmological Constraints

scholarly journals Cosmological constraints on fast transition unified dark energy and dark matter models

2016 ◽  
Vol 93 (4) ◽  
Author(s):  
Ruth Lazkoz ◽  
Iker Leanizbarrutia ◽  
Vincenzo Salzano
Keyword(s):  
Dark Matter ◽  
Dark Energy ◽  
Cosmological Constraints

scholarly journals Constraints on the composite photon theory

2016 ◽  
Vol 31 (36) ◽  
pp. 1675002 ◽  
Author(s):  
Lerh Feng Low
Keyword(s):  
Dark Matter ◽  
Ordinary Matter ◽  
Cosmological Constraints

In a 2015 paper [W. A. Perkins, Mod. Phys. Lett. A 30, 1550157 (2015)], Perkins argued that based on the composite photon theory (CPT), antiphotons should not interact with ordinary matter. This implies that antiphotons are undetectable by detectors made of ordinary matter, and hence that antimatter galaxies are a possible candidate for dark matter. The purpose of this short letter is to argue that this conclusion is highly unlikely, because of cosmological constraints on the density of radiation, the distribution of dark matter and C-symmetry.

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