In this letter, it is shown that dark energy is contributed by riccion (a particle concept for physical aspect of the Ricci scalar curvature) in a natural way without any input in the theory for it. In contrast to other models, where an idea for dark energy is introduced in the beginning of the theory, here it emerges from the gravitational sector spontaneously. Interestingly, it is found that ...

We show that rapid primordial inflation and slow asymptotic inflation is a natural consequence of Brans-Dicke theory. The ratio of the two inflation parameters is proportional to the square root of the Brans-Dicke parameter ω (ω ≫ 1). We also calculate the Hubble parameter H and the time variation of the time dependent Newtonian gravitational constant G for both regimes. The variation of the Hu...

This talk reviews the constraints imposed by binary-pulsar data on gravity theories, and notably on “scalar-tensor” theories which are the most natural alternatives to general relativity. Because neutron stars have a strong gravitational binding energy, binarypulsar tests are qualitatively different from solar-system experiments: They have the capability of probing models which are indistinguis...

In this paper a hierarchical Neural Network-based approach is presented to identify the noise in the Virgo experiment to detect Gravitational Waves by means of a laser interferometer.

In this short note, we try to clarify a seemly trivial but often confusing question in relating a higher-dimensional physical gravitational constant to its lower-dimensional correspondence in Kaluza-Klein reduction. In particular, we re-derive the low-energy M-theory gravitational constant in terms of type IIA string coupling gs and constant α ′ through the metric relation between the two theor...

We consider multidimensional gravity with a Lagrangian containing the Ricci tensor squared and the Kretschmann invariant. In a Kaluza-Klein approach with a single compact extra space of arbitrary dimension, with the aid of a slow-change approximation (as compared with the Planck scale), we build a class of spatially flat cosmological models in which both the observed scale factor a(τ) and the e...

In this letter, it is shown that dark energy is contributed by riccion (a particle concept for physical aspect of the Ricci scalar curvature) in a natural way without any input in the theory for it. It is in contrast to other models, where an idea for dark energy is introduced in the beginning of the theory. Interestingly, it is found that dark energy density, obtained here, decreases with the ...

Based on unified theory of electromagnetic interactions and gravitational interactions, the non-relativistic limit of the equation of motion of a charged Dirac particle in gravitational field is studied. From the Schrodinger equation obtained from this non-relativistic limit, we could see that the classical Newtonian gravitational potential appears as a part of the potential in the Schrodinger ...

If the Standard Model is correct, and fundamental fermions exist only in the three generations, then the CKM matrix should be unitary. However, there remain questions over 2+ standard deviations from unitarity in the various data sets, in part from the value of the neutron lifetime. We discuss a simple space-based experiment that, at an orbit height of 500 km above Earth, would measure the kine...

We investigate the effect of possible a-priori “imprinting” effects of general relativity itself on satellite/spaceraft-based tests of it. We deal with some performed or proposed time-delay ranging experiments in the Sun’s gravitational field, and with the attempts to measure the Lense-Thirring effect with the LAGEOS satellites orbiting the Earth. It turns out that the “imprint” of general rela...