Gravitation And Cosmology

  title={Gravitation And Cosmology},
  author={Monika Richter},
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Constraining theories of gravity by GINGER experiment
The debate on gravity theories to extend or modify general relativity is very active today because of the issues related to ultraviolet and infrared behavior of Einstein’s theory. In the first case,Expand
The graviton Compton mass as dark energy
One of the greatest challenges of science is to understand the current accelerated expansion of the Universe. In this work we show that by considering the quantum nature of the gravitational field,Expand
Non-comoving cosmology
One of the fundamental assumptions of the standard $\Lambda$CDM cosmology is that, on large scales, all the matter-energy components of the Universe share a common rest frame. This seems natural forExpand
Distortions of Robertson–Walker metric in perturbative cosmology and interpretation as dark matter and cosmological constant
In the last years, we saw more and more attempts to explain dark matter as a general relativistic effect, at least for some fraction. Following this philosophy, we considered the gravitationalExpand
New generalizations of cosmography inspired by the Padé approximant
The current accelerated expansion of the universe has been one of the most important fields in physics and astronomy since 1998. Many cosmological models have been proposed in the literature toExpand
Effective energy density of relic gravitons
The energy density, the pressure and the anisotropic stress of the relic gravitons do not have a unique gauge-invariant and frame-invariant expression since the equivalence principle ultimatelyExpand
A Cosmological View on Milgrom’s Acceleration Constant
In this article it is shown how Milgrom’s acceleration constant is related with the ΩΛ, Ωm and ΩB values of the matter distribution within observable universe as defined in the Standard Model ofExpand
Primordial backgrounds of relic gravitons
The diffuse backgrounds of relic gravitons with frequencies ranging between the aHz band and the GHz region encode the ultimate information on the primeval evolution of the plasma and on theExpand
Friedmann cosmology with decaying vacuum density in Brans-Dicke theory
In this paper, we study Friedmann cosmology with time-varying vacuum energy density in the context of Brans-Dicke theory. We consider an isotropic and homogeneous flat space, filled with aExpand
Dark Energy: The Shadowy Reflection of Dark Matter?
The cosmological model with matter content in the form of a thermodynamically-involved DM fluid not only interprets the observational data associated with the recent history of Universe expansion, but also confronts successfully with every majorcosmological issue. Expand