I consider certain renormalization effects in curved spacetime quantum field theory. In the very early universe these effects resemble those of a cosmological constant, while in the present universe they give rise to a significant finite renormalization of the gravitational constant. The relevant renormalization term and its relation to elementary particle masses was first found by Parker and T...

We prove that, given a stress-free, axially symmetric elastic body, there exists, for sufficiently small values of the gravitational constant and of the angular frequency, a unique stationary axisymmetric solution to the Einstein equations coupled to the equations of relativistic elasticity with the body performing rigid rotations around the symmetry axis at the given angular frequency.

A well-balanced hollow copper sphere freely floating and almost totally submerged in water is observed to move toward the nearby edge of a cliff'. This observation is consistent with a substance-dependent, medium-range force postulated in a recent reanalysis of the Eotvos experiment. Further measurements with difTerent elements and geometries will be required to establish definitely the existen...

An intriguing aspect of torsion, especially for chemists, is the fact that, unlike stretching, bending, shear, uniaxial, radial or isotropic compression, expansion etc, torsion is the only mode of deformation that is intrinsically chiral. Hence, torsion can turn achiral objects into chiral ones, and it can discriminate between chiral enantiomorphs turning them diastereomorphous. Beside this uni...

A measurement of Newton's gravitational constant G has been made with a cryogenic torsion pendulum operating below 4 K in a dynamic mode in which G is determined from the change in torsional period when a field source mass is moved between two orientations. The source mass was a pair of copper rings that produced an extremely uniform gravitational field gradient, whereas the pendulum was a thin...

Abstract. It is found the exact solution of the Poisson equation for the multidimensional space with topology M3+d = R3 ×T d . This solution describes smooth transition from the Newtonian behavior 1/r3 for distances bigger than periods of tori (the extra dimension sizes) to multidimensional behavior 1/r1+d 3+d in opposite limit. In the case of one extra dimension d = 1, the gravitational potent...

We embed the Loop Quantum Gravity Barbero-Immirzi parameter and field within an action describing 4D, N = 1 supergravity and thus within a Low Energy Effective Action of Superstring/M-Theory. We use the fully gauge-covariant description of supergrav-ity in (curved) superspace. The gravitational constant is replaced with the vacuum expectation value of a scalar field, which in local supersymmetr...

Abstract. An analysis of a spherically symmetric braneworld configuration is performed when the intrinsic curvature scalar is included in the bulk action. In the case when the electric part of the Weyl tensor is zero, all the exterior solutions are found; one of them is of the Schwarzschild-(A)dS4 form, which is matched to a modified Oppenheimer-Volkoff interior solution. In the case when the e...

Membrane/fivebrane duality in D = 11 implies Type IIA string/Type IIA fivebrane duality in D = 10, which in turn implies Type IIA string/heterotic string duality in D = 6. To test the conjecture, we reproduce the corrections to the 3-form field equations of the D = 10 Type IIA string (a mixture of tree-level and one-loop effects) starting from the Chern-Simons corrections to the 7-form Bianchi ...

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 ...