S
Steffen Stern
Publications - 12
Citations - 206
Steffen Stern is an academic researcher. The author has contributed to research in topics: Dark energy & Quintessence. The author has an hindex of 7, co-authored 12 publications receiving 196 citations.
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Primordial nucleosynthesis as a probe of fundamental physics parameters
TL;DR: In this article, the effect of variation of fundamental couplings and mass scales on primordial nucleosynthesis was analyzed in a systematic way, and the response of primordial element abundances to the variation of a large number of nuclear physics parameters, including nuclear binding energies, was established.
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Baryon acoustic oscillations and dynamical dark energy
TL;DR: In this article, the impact of dark energy at last scattering on measurements of baryon acoustic oscillations (BAOs) was investigated and it was shown that an early dark energy component can contribute a systematic uncertainty to BAO measurements of up to 2.5%.
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Unifying cosmological and recent time variations of fundamental couplings
TL;DR: In this paper, the authors explore several distinct scenarios based on unification of gauge couplings, providing a representative (though not exhaustive) sample of such relations, and discuss whether a monotonic time evolution is allowed.
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Time variation of fundamental couplings and dynamical dark energy
TL;DR: In this paper, the authors discuss two specific models of scalar evolution: crossover quintessence and growing neutrino models, and compute bounds on the present rate of coupling variation from experiments testing the differential accelerations for bodies with equal mass and different composition.
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Competing bounds on the present-day time variation of fundamental constants
TL;DR: In this paper, the authors compare the sensitivity of a recent bound on time variation of the fine structure constant from optical clocks with bounds on time-varying fundamental constants from atomic clocks sensitive to the electron-toproton mass ratio, from radioactive decay rates in meteorites, and from the Oklo natural reactor.