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String theory and gravity
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It is pointed out that string-loop effects may generate matter couplings for the dilaton allowing this scalar partner of the tensorial graviton to stay massless while contributing to macroscopic gravity in a way naturally compatible with existing experimental data. Under a certain assumption of universality of the dilaton coupling functions (possibly realized through a discrete symmetry such as S-duality), the cosmological evolution drives the dilaton towards values where it decouples from matter. At the present cosmological epoch, the coupling to matter of the dilaton should be very small, but non zero. This provides a new motivation for improving the experimental tests of Einstein's Equivalence Principle.
Forward citations
Cited by 3 Pith papers
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Distinguishing Monochromatic Signals in LISA and Taiji: Ultralight Dark Matter versus Gravitational Waves
Null-response interferometric channels can separate monochromatic ultralight dark matter signals from gravitational waves in LISA and Taiji, most effectively at high frequencies.
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Axiverse Lampposts
In a hierarchical multi-axion theory with random couplings, axion field ranges shrink with 1/sqrt(N), generic axion–SM couplings are suppressed, but the QCD axion's coupling is unsuppressed.
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Probing Fundamental Constant Oscillation in the Galactic Center with S-Star Spectroscopy
Time-resolved spectroscopy of S-stars around Sgr A* can probe oscillations of the fine-structure constant induced by superradiant axion clouds or dark-matter soliton cores, with future instruments potentially reaching...
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