Solar System Experiments in the Search for Dark Energy and Dark Matter
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866912739246473216 |
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| author | Turyshev, Slava G. |
| author_facet | Turyshev, Slava G. |
| contents | We reassess the realistic discovery reach of Solar-System experiments for dark energy (DE) and dark matter (DM), making explicit the bridge from cosmology-level linear responses to local, screened residuals. In scalar-tensor frameworks with a universal conformal coupling $A(ϕ)$ and chameleon/Vainshtein screening, we map cosmological responses $\{μ(z,k),Σ(z,k)\}$ inferred by DESI and \emph{Euclid} to thin-shell or Vainshtein residuals in deep Solar potentials $Φ_N$. We emphasize a two-branch strategy. In a detection-first branch, a verified local anomaly -- an Einstein equivalence principle (EEP) violation, a Shapiro-delay signal with $|γ-1|\sim\mathrm{few}\times 10^{-6}$, an AU-scale Yukawa tail, or a ultralight DM (ULDM) line in clocks/atom interferometers in space (AIS) -- triggers a joint refit of cosmology and Solar-System data under a common microphysical parameterization $\{V(ϕ),A(ϕ)\}$. In a guardrail branch, Solar-System tests enforce constraints (EEP; PPN parameters $γ,β$; and $\dot G/G$) and close unscreened or weakly screened corners indicated by cosmology. We forecast, per conjunction, $|γ-1|\lesssim (2-5)\times 10^{-6}$ (Ka-/X-band or optical Shapiro), $η_{EEP}\sim (1\mbox{--}10)\times 10^{-17}$ (drag-free AIS), $|\dot G/G|\sim(3-5)\times10^{-15}\,\mathrm{yr^{-1}}$ (sub-mm-class LLR), a uniform ~2x tightening of AU-scale Yukawa/DM-density bounds, and $(3-10)\times$ improved ULDM-coupling reach from clocks. For a conformal benchmark, $μ_{ lin,0}=0.10$ implies $χ\simeq \sqrt{μ_{lin,0}/2}$ and a Sun thin shell $ΔR/R\lesssim (1/3χ)\sqrt{|γ-1|/2}=2.4\times 10^{-3}$ at $|γ-1|=5\times 10^{-6}$; Vainshtein screening at 1 AU yields $|γ-1|\lesssim 10^{-11}$, naturally below near-term reach. We recommend a cost-effective guardrail+discovery portfolio with explicit triggers for escalation to dedicated missions. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_05910 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Solar System Experiments in the Search for Dark Energy and Dark Matter Turyshev, Slava G. Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology We reassess the realistic discovery reach of Solar-System experiments for dark energy (DE) and dark matter (DM), making explicit the bridge from cosmology-level linear responses to local, screened residuals. In scalar-tensor frameworks with a universal conformal coupling $A(ϕ)$ and chameleon/Vainshtein screening, we map cosmological responses $\{μ(z,k),Σ(z,k)\}$ inferred by DESI and \emph{Euclid} to thin-shell or Vainshtein residuals in deep Solar potentials $Φ_N$. We emphasize a two-branch strategy. In a detection-first branch, a verified local anomaly -- an Einstein equivalence principle (EEP) violation, a Shapiro-delay signal with $|γ-1|\sim\mathrm{few}\times 10^{-6}$, an AU-scale Yukawa tail, or a ultralight DM (ULDM) line in clocks/atom interferometers in space (AIS) -- triggers a joint refit of cosmology and Solar-System data under a common microphysical parameterization $\{V(ϕ),A(ϕ)\}$. In a guardrail branch, Solar-System tests enforce constraints (EEP; PPN parameters $γ,β$; and $\dot G/G$) and close unscreened or weakly screened corners indicated by cosmology. We forecast, per conjunction, $|γ-1|\lesssim (2-5)\times 10^{-6}$ (Ka-/X-band or optical Shapiro), $η_{EEP}\sim (1\mbox{--}10)\times 10^{-17}$ (drag-free AIS), $|\dot G/G|\sim(3-5)\times10^{-15}\,\mathrm{yr^{-1}}$ (sub-mm-class LLR), a uniform ~2x tightening of AU-scale Yukawa/DM-density bounds, and $(3-10)\times$ improved ULDM-coupling reach from clocks. For a conformal benchmark, $μ_{ lin,0}=0.10$ implies $χ\simeq \sqrt{μ_{lin,0}/2}$ and a Sun thin shell $ΔR/R\lesssim (1/3χ)\sqrt{|γ-1|/2}=2.4\times 10^{-3}$ at $|γ-1|=5\times 10^{-6}$; Vainshtein screening at 1 AU yields $|γ-1|\lesssim 10^{-11}$, naturally below near-term reach. We recommend a cost-effective guardrail+discovery portfolio with explicit triggers for escalation to dedicated missions. |
| title | Solar System Experiments in the Search for Dark Energy and Dark Matter |
| topic | Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology |
| url | https://arxiv.org/abs/2509.05910 |