scholarly journals Dark matter effects in vacuum spacetime

2010 ◽  
Vol 82 (2) ◽  
Author(s):  
Luca Rizzi ◽  
Sergio L. Cacciatori ◽  
Vittorio Gorini ◽  
Alexander Kamenshchik ◽  
Oliver F. Piattella
Keyword(s):  
Dark Matter ◽  
Matter Effects ◽  
Vacuum Spacetime

scholarly journals SOME PROPERTIES OF THE "STRING GAS" WITH THE EQUATION OF STATE $p = -\frac{1}{3} \rho$

2012 ◽  
Vol 21 (01) ◽  
pp. 1250004 ◽  
Author(s):  
ALEXANDER YU. KAMENSHCHIK ◽  
ISAAK M. KHALATNIKOV
Keyword(s):  
Dark Matter ◽  
Equation Of State ◽  
Perfect Fluid ◽  
Spherically Symmetric ◽  
Rotation Curves ◽  
Matter Effects ◽  
Symmetric Spacetimes ◽  
State Formula ◽  
Spherically Symmetric Spacetimes

We show that the string gas — a perfect fluid with the equation of state [Formula: see text] possesses rather interesting properties. In Friedmann universes its presence can change the observable topology of the space; in the spherically symmetric spacetimes it produces rather bizzare geometries and in a way its influence on the rotation curves mimics the dark matter effects.

scholarly journals Nonholonomic ricci flows and Finsler–Lagrange f(R,F,L)–modified gravity and dark matter effects

2017 ◽  
Author(s):  
Maria Alexiou ◽  
Tamara Gheorghiu ◽  
Panayiotis C. Stavrinos ◽  
Olivia Vacaru ◽  
Sergiu I. Vacaru
Keyword(s):  
Dark Matter ◽  
Modified Gravity ◽  
Matter Effects ◽  
Ricci Flows

scholarly journals A Brief Review on Primordial Black Holes as Dark Matter

2021 ◽  
Vol 8 ◽  
Author(s):  
Pablo Villanueva-Domingo ◽  
Olga Mena ◽  
Sergio Palomares-Ruiz
Keyword(s):  
Black Holes ◽  
Dark Matter ◽  
Primordial Black Holes ◽  
Evolution Of The Universe ◽  
Matter Effects ◽  
The Universe ◽  
Hawking Evaporation

Primordial black holes (PBHs) represent a natural candidate for one of the components of the dark matter (DM) in the Universe. In this review, we shall discuss the basics of their formation, abundance and signatures. Some of their characteristic signals are examined, such as the emission of particles due to Hawking evaporation and the accretion of the surrounding matter, effects which could leave an impact in the evolution of the Universe and the formation of structures. The most relevant probes capable of constraining their masses and population are discussed.

scholarly journals Signatures of ultralight dark matter in neutrino oscillation experiments

2021 ◽  
Vol 2021 (1) ◽  
Author(s):  
Abhish Dev ◽  
Pedro A. N. Machado ◽  
Pablo Martínez-Miravé
Keyword(s):  
Dark Matter ◽  
Neutrino Oscillation ◽  
Experimental Analysis ◽  
Neutrino Oscillations ◽  
Experimental Setup ◽  
Oscillation Probability ◽  
Time Modulation ◽  
Matter Effects ◽  
Model Independent ◽  
Oscillation Experiment

Abstract We study how neutrino oscillations could probe the existence of ultralight bosonic dark matter. Three distinct signatures on neutrino oscillations are identified, depending on the mass of the dark matter and the specific experimental setup. These are time modulation signals, oscillation probability distortions due to fast modulations, and fast varying matter effects. We provide all the necessary information to perform a bottom-up, model-independent experimental analysis to probe such scenarios. Using the future DUNE experiment as an example, we estimate its sensitivity to ultralight scalar dark matter. Our results could be easily used by any other oscillation experiment.

scholarly journals Dark matter effects on neutron star properties

2018 ◽  
Vol 97 (12) ◽  
Author(s):  
John Ellis ◽  
Gert Hütsi ◽  
Kristjan Kannike ◽  
Luca Marzola ◽  
Martti Raidal ◽  
...  
Keyword(s):  
Dark Matter ◽  
Neutron Star ◽  
Matter Effects

scholarly journals CAN A NONLOCAL MODEL OF GRAVITY REPRODUCE DARK MATTER EFFECTS IN AGREEMENT WITH MOND?

2014 ◽  
Vol 23 (01) ◽  
pp. 1450008 ◽  
Author(s):  
IVAN ARRAUT
Keyword(s):  
Dark Matter ◽  
Cosmological Constant ◽  
Field Approximation ◽  
Weak Field ◽  
Nonlocal Model ◽  
Field Equations ◽  
Matter Effects ◽  
Weak Field Approximation

I analyze the possibility of reproducing MONDian dark matter effects by using a nonlocal model of gravity. The model was used before in order to recreate screening effects for the cosmological constant (Λ) value. Although the model in the weak-field approximation (in static coordinates) can reproduce the field equations in agreement with the AQUAL Lagrangian, the solutions are scale dependent and cannot reproduce the same dynamics in agreement with MOND.

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