G. Pa\'al and the cosmological revolution

TL;DR

This paper commemorates Gy"orgy Pa"al's contributions to cosmology, highlighting his early work on large-scale inhomogeneity, quasar redshift periodicity, and the implications of the Lambda cosmological constant for late-time inflation.

Contribution

It introduces Gy"orgy Pa"al's pioneering research on universe inhomogeneity and redshift periodicity, emphasizing his early insights into the Lambda cosmological constant.

Findings

Identified periodicity in quasar redshift distribution.

Suggested quasi-periodicity as a cause of late inflation.

Contributed to understanding large-scale universe structure.

Abstract

Gy\"orgy Pa\'al, the Hungarian cosmologist died in 1992. This article was published twenty-five years later in the Hungarian Astronomical Association (HAA, MCSE in Hungarian) 2017 yearbook for his memory. After short introduction of the history of cosmology we briefly introduce the XX. century cosmological discoveries. For his early years G. Pa\'al studied the large-scale inhomogeneity in the Universe. He was one of the first astronomer who realized some periodicity in the quasar redshift distribution. In the early 90s he also studied the galaxy redshift distribution in the so-called pencil-beam survey and suggested the quasi periodicity can be cause of the late inflation in the Universe namely the Lambda cosmological constant.