scholarly journals Bulk viscosity, decaying dark matter, and the cosmic acceleration

2007 ◽  
Vol 75 (4) ◽  
Author(s):  
James R. Wilson ◽  
Grant J. Mathews ◽  
George M. Fuller
Keyword(s):  
Dark Matter ◽  
Bulk Viscosity ◽  
Cosmic Acceleration ◽  
Decaying Dark Matter

ALTERNATIVE UNIFIED VIEWS ON DARK MATTER AND DARK ENERGY

2008 ◽  
Vol 23 (17n20) ◽  
pp. 1372-1383 ◽  
Author(s):  
GRANT J. MATHEWS ◽  
K. ICHIKI ◽  
T. KAJINO ◽  
N. Q. LAN ◽  
X. ZHAO
Keyword(s):  
Dark Matter ◽  
Dark Energy ◽  
Bulk Viscosity ◽  
Physical Phenomenon ◽  
Friedmann Equation ◽  
Brane World ◽  
Cosmic Acceleration ◽  
Simple Fact ◽  
Relativistic Corrections

The simple fact that the present closure contributions in dark matter and dark energy are nearly equal begs the question as to whether they could be different aspects of the same physical phenomenon. Here, we review constraints several postulates as to how this coincidence could be achieved. These include: 1) The possibility that the dark matter decays producing a bulk viscosity in the cosmic fluid; 2) cosmic acceleration produced by the inflow of dark matter from a bulk dimension in brane-world cosmology; and 3) The possibility of relativistic corrections to the Friedmann equation from the presence of local inhomogeneities. Constraints and observational tests of each of these cosmologies are proposed.

scholarly journals Deep Search for Decaying Dark Matter with XMM-Newton Blank-Sky Observations

2021 ◽  
Vol 127 (5) ◽  
Author(s):  
Joshua W. Foster ◽  
Marius Kongsore ◽  
Christopher Dessert ◽  
Yujin Park ◽  
Nicholas L. Rodd ◽  
...  
Keyword(s):  
Dark Matter ◽  
Decaying Dark Matter

scholarly journals MODIFIED GRAVITY AS A COMMON CAUSE FOR COSMIC ACCELERATION AND FLAT GALAXY ROTATION CURVES

2012 ◽  
Vol 21 (11) ◽  
pp. 1242002 ◽  
Author(s):  
PRITI MISHRA ◽  
TEJINDER P. SINGH
Keyword(s):  
Dark Matter ◽  
Dark Energy ◽  
Cosmic Acceleration ◽  
Accelerating Universe ◽  
Rotation Curves ◽  
Common Cause ◽  
Order Of Magnitude ◽  
Flat Rotation Curves ◽  
Acceleration Of The Universe ◽  
Galaxy Rotation Curves

Flat galaxy rotation curves and the accelerating Universe both imply the existence of a critical acceleration, which is of the same order of magnitude in both the cases, in spite of the galactic and cosmic length scales being vastly different. Yet, it is customary to explain galactic acceleration by invoking gravitationally bound dark matter, and cosmic acceleration by invoking a "repulsive" dark energy. Instead, might it not be the case that the flatness of rotation curves and the acceleration of the Universe have a common cause? In this essay we propose a modified theory of gravity. By applying the theory on galactic scales we demonstrate flat rotation curves without dark matter, and by applying it on cosmological scales we demonstrate cosmic acceleration without dark energy.

Decaying Dark Matter and the Deficit of Dwarf Halos

2009 ◽  
Author(s):  
Majd Abdelqader ◽  
Fulvio Melia ◽  
Shaaban Khalil
Keyword(s):  
Dark Matter ◽  
Decaying Dark Matter

scholarly journals Freeze-in production of decaying dark matter in five steps

2018 ◽  
Vol 2018 (11) ◽  
pp. 048-048 ◽  
Author(s):  
Saniya Heeba ◽  
Felix Kahlhoefer ◽  
Patrick Stöcker
Keyword(s):  
Dark Matter ◽  
Decaying Dark Matter

scholarly journals A Search for Neutrinos from Decaying Dark Matter in Galaxy Clusters and Galaxies with IceCube

2021 ◽  
Author(s):  
Minjin Jeong ◽  
Rasha Abbasi ◽  
Markus Ackermann ◽  
Jenni Adams ◽  
Juanan Aguilar ◽  
...  
Keyword(s):  
Dark Matter ◽  
Galaxy Clusters ◽  
Decaying Dark Matter
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