778 citations · 4.4k across the 68 of their papers we have counts for
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Wave correlations and quantum noise in cosmology
Ulf Leonhardt
Wave noise is correlated. While it may look random in space, correlations appear in space-time, because the noise is carried by wave propagation. These correlations of wave noise g…
Casimir cosmology
Ulf Leonhardt
In 1998 astronomers discovered that the expansion of the universe is accelerating. Somehow, something must have made gravity repulsive on cosmological scales. This something was ca…
Cosmological horizons radiate
Ulf Leonhardt
Gibbons and Hawking [Phys. Rev. D 15, 2738 (1977)] have shown that the horizon of de Sitter space emits radiation in the same way as the event horizon of the black hole. But actual…
Lifshitz cosmology: quantum vacuum and Hubble tension
Dror Berechya, Ulf Leonhardt
Dark energy is one of the greatest scientific mysteries of today. The idea that dark energy originates from quantum vacuum fluctuations has circulated since the late '60s, but theo…
The case for a Casimir cosmology
Ulf Leonhardt
The cosmological constant, also known as dark energy, was believed to be caused by vacuum fluctuations, but naive calculations give results in stark disagreement with fact. In the…
Lifshitz theory of the cosmological constant
Ulf Leonhardt
Astrophysics has given empirical evidence for the cosmological constant that accelerates the expansion of the universe. Atomic, Molecular, and Optical Physics has proven experiment…