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I have worked in astrophysical cosmology, both theoretical and observational, over the last two decades. Around 1987 I began to study the thermal history and consistency tests of the Friedmann model of the Universe. In particular, I was concerned with the cosmological constant Λ, the need of which I realised when I worked on the galaxy number count, which witnessed significant progress with the advent of charge coupled devices. A non-zero Λ was also consistent with the view I obtained from the work to assess the determination of the Hubble constant from nearby galaxies. I raised the issue of the cosmological constant being non-vanishing, but this was an anathema at the time, something that should be avoided at any rate, and I was subsequently strongly criticised by all.
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Astronomy & Astrophysics (2017)
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