Report
Limits on a Gravitational Field Dependence of the Proton--Electron Mass Ratio from H$_2$ in White Dwarf Stars
| العنوان: | Limits on a Gravitational Field Dependence of the Proton--Electron Mass Ratio from H$_2$ in White Dwarf Stars |
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| المؤلفون: | Bagdonaite, Julija, Salumbides, Edcel J., Preval, Simon P., Barstow, Martin A., Barrow, John D., Murphy, Michael T., Ubachs, Wim |
| المصدر: | Phys. Rev. Lett. 113, 123002 (2014) |
| سنة النشر: | 2014 |
| المجموعة: | Astrophysics General Relativity and Quantum Cosmology |
| مصطلحات موضوعية: | General Relativity and Quantum Cosmology, Astrophysics - Cosmology and Nongalactic Astrophysics |
| الوصف: | Spectra of molecular hydrogen (H$_2$) are employed to search for a possible proton-to-electron mass ratio ($\mu$) dependence on gravity. The Lyman transitions of H$_2$, observed with the Hubble Space Telescope towards white dwarf stars that underwent a gravitational collapse, are compared to accurate laboratory spectra taking into account the high temperature conditions ($T \sim 13\,000$ K) of their photospheres. We derive sensitivity coefficients $K_i$ which define how the individual H$_2$ transitions shift due to $\mu$-dependence. The spectrum of white dwarf star GD133 yields a $\Delta\mu/\mu$ constraint of $(-2.7\pm4.7_{\rm stat}\pm 0.2_{\rm sys})\times10^{-5}$ for a local environment of a gravitational potential $\phi\sim10^4\ \phi_\textrm{Earth}$, while that of G29$-$38 yields $\Delta\mu/\mu=(-5.8\pm3.8_{\rm stat}\pm 0.3_{\rm sys})\times10^{-5}$ for a potential of $2 \times 10^4$ $\phi_\textrm{Earth}$. Comment: 5 pages, 3 figures. Accepted by PRL |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1103/PhysRevLett.113.123002 |
| URL الوصول: | http://arxiv.org/abs/1409.1000 |
| رقم الانضمام: | edsarx.1409.1000 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1103/PhysRevLett.113.123002 |
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