Critical Thoughts on Cosmology

TL;DR

This paper critically examines foundational assumptions in cosmology, questioning dark energy, black-hole evaporation, and redshift interpretations, proposing alternative views and highlighting inconsistencies in prevailing models.

Contribution

It presents alternative perspectives on cosmic acceleration, black-hole physics, and redshift phenomena, challenging mainstream cosmological theories and suggesting new interpretations.

Findings

Dark energy may be an artefact of incorrect cosmic timescale evaluation

Black-hole evaporation predictions are questionable

Redshifts in jet sources may be non-cosmological in origin

Abstract

An overview is given in section 1, of uncertain building blocks of present-day cosmologies. Thereafter, these edited lecture notes deal with the following four special problems: (1) They advertise Wiltshire's result -- making `dark energy' obsolete -- that accelerated cosmic expansion may be an artefact, due to an incorrect evaluation of the cosmic timescale in a Universe whose bulk matter is inhomogeneously distributed. (2) They cast doubt on Hawking's prediction of black-hole evaporation. (3) They point at various inconsistencies of the black-hole paradigm, in favour of nuclear-burning central engines of AGN. (4) They re-interpret (a best case of) `anomalous redshifts' as non-cosmological, kinematic redshifts in strong jet sources.