Accelerating universe, WEP violation and antihydrogen atoms
Yasunori Fujii

TL;DR
This paper explores how potential violations of the Weak Equivalence Principle, suggested by antihydrogen experiments, could be linked to cosmological acceleration and scalar-tensor theories, indicating new physics beyond standard models.
Contribution
It proposes a theoretical framework connecting WEP violation with cosmological acceleration using scalar-tensor gravity and conformal transformations, highlighting potential differences in gravitational behavior of matter and antimatter.
Findings
WEP violation may manifest as differences in hydrogen and antihydrogen gravitational responses.
Scalar-tensor theories can naturally incorporate cosmological acceleration and WEP breakdown.
The approach suggests new experimental tests for fundamental physics and cosmology.
Abstract
Apart from the suspected violation of the CPT invariance, we might expect if the measurements of antihydrogen atoms provide testing Weak Equivalence Principle (WEP) in the gravitational phenomena. We start with how its violation can be related to the expected idea of unification of particle physics and gravitation, an attempt beyond the standard theories, including general relativity of Einstein. A particular emphasis will be placed on the issue of an accelerating universe, a rather recent development since nearly 10 years ago, suggesting a strong motivation toward attempts beyond the conventional concepts of the traditional cosmology. We face today's version of the cosmological constant problem. A candidate of the new ingredient appears to be provided by a scalar field, sometimes under the names like quintessence or dark-energy. In this article, we discuss the subject from a point of…
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