Various Aspects of Modern Physics: Part 1 from Administrator's blog

An Interpretation of the Laws of Gravity and Inertia (by Giuliano Bettini): Abstract: The ideas of fixed stars as source of inertia were discuss in physics from Mach onwards. Maxwell-like equations for gravitation and inertia were obtained by several authors as subspecies of the simplified theory of General Relativity. In this regard, Dennis Sciama’s work was a precursor. Through introduction of a four-potential, I derive here a simple tentative interpretation of the laws about gravity and inertia in complete analogy with electromagnetism. A four-potential is usually not introduced in classical mechanics. As it is shown here, the field produced by this four-potential describes both gravitational and inertial forces. The physical presence of this field associated with this four-potential seems to be a fact even more concrete the usual admission of inertial "fictitious forces".

Time Paradox, Zitterbewegung and Noncommutative Geometry (by Lawrence B. Crowell): Abstract: The zitterbewgung of the electron is associated with an intrinsic time for an electron, or any of the fermionic particles with mass such as quarks and leptons. In this article it is shown that a massless particle coupled to noncommutative coordinate geometry is subjected to a gauge-like force. This force acts to trap the massless particle in an orbit within a region. This bottled massless particle then has an induced mass. This is then argued to be tied to fundamental aspects of physics, such as a dynamical Higgs model, as well as strings and p-brane theory.

Perspectives towards the Interpretation of Physical Space as a Medium of Immediate Quantum Information Transfer (by Davide Fiscaletti, Amrit S. Sorli): Abstract: The space-time manifold characteristic of special relativity cannot be considered the basic arena of physical processes. Quantum non-locality introduces the possibility that the space-time manifold emerges from a more fundamental level of physical space. Here a new interpretation of quantum non-locality is suggested, which is based on a symmetrized quantum potential approach. On the basis of this interpretation, at a fundamental level, space functions as an immediate information medium between subatomic particles and it is possible to interpret in a correct and appropriate way both the forward time and the time reverse of the same quantum process; as a consequence of this interpretation, time exists only as a coordinate measuring the numerical order of material motions. A parallelism with the background of general relativity and quantum gravity is made. Finally, a symmetrized extension of Wheeler-DeWitt equation is suggested.

Covariant Energy-Momentum Conservation in General Relativity with Cosmological Constant (by Philip E. Gibbs: Abstract: A covariant formula for conserved currents of energy, momentum and angular-momentum is derived from a general form of Noether’s theorem applied directly to the Einstein-Hilbert action of classical general relativity. Energy conservation in closed and flat big-bang cosmologies including cosmic radiation and dark energy is discussed as special cases. Special care is taken to distinguish between kinematic and dynamic expressions.

A White Hole Model of the Big Bang (by Philip E. Gibbs: Abstract: A model of the universe as a very large white hole provides a useful alternative inhomogeneous theory to pit against the homogeneous standard FLRW big bang models. The white hole would have to be sufficiently large that we can fit comfortably inside the event horizon at the present time, so that the inhomogeneities of space-time are not in contradiction with current observational limits. A specific Lemaître-Tolman model of a spherically symmetric non-rotating white hole with a few adjustable parameters is investigated. Comparison of calculated anisotropy in the Hubble flow and the CMB against observational limits constrain the parameter space. A Copernican principle would require that we are not too near the centre of the white hole. As an additional constraint this predicts a value of W0 between 0.9999 and 1.

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