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Did the Big Bang and cosmic inflation really happen?
by Marcin Postolak

(A tale of alternative cosmological models) . “The evolution of the world can be compared to a display of fireworks that has just ended: some...

One Spectrum to cure them all: a primordial solution to cosmological anomalies and tensions
by Dhiraj Kumar Hazra, IMSc, Chennai, India

Our present understanding of the Universe is shaped by cosmological observations. Based on a model (built with well established theories + certain supporting assumptions) we...

Quantum vacuum: the cosmological constant problem
by Joan Solà Peracaula (U. Barcelona)

(A desperate attempt at explaining infinity in finite terms…) 1 Einstein and the cosmological constant I invite the nonexpert reader to a short but intense...

Is modified gravity an illusion?
by Oleksii Sokoliuk

Cosmology has been developed for thousands of years and there have been dozens of theories proposedto describe the observable universe. Starting from the Babylonian cosmology...

There are no "coincidences" in the universe
by Vivian Poulin

These are interesting times for cosmologists. On the one hand, general relativity and the cosmological principle of homogeneity and isotropy on sufficiently large scales has...

Reading the tea leaves in ΛCDM tensions
by Eoin O'Colgain

The field of cosmology appears to be in flux. The standard model ΛCDM, which is based on the cosmological constant Λ and cold dark matter...

Quantum effects in the Universe
by Antonio Ferreiro

Einstein’s theory of General Relativity (GR) has not only changed our view on gravity but also had deep impact on the construction of modern physical...