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<p class="MsoNormal"><span style="font-size:11.0pt;mso-fareast-language:EN-US">Dear all,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-fareast-language:EN-US">See below announcement of a postdoc opportunity that may interest both Astronomers and Particle Cosmologists.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-fareast-language:EN-US">Best wishes,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-fareast-language:EN-US">Alfonso<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span style="font-family:"Arial",sans-serif;color:#009BBD;mso-ligatures:standardcontextual">Alfonso Aragón-Salamanca</span></b><span style="mso-ligatures:standardcontextual"><o:p></o:p></span></p>
<p class="MsoNormal"><b><span style="font-family:"Arial",sans-serif;color:#131B57;mso-ligatures:standardcontextual">Professor of Astronomy</span></b><span style="mso-ligatures:standardcontextual"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif;color:#1F497D;mso-ligatures:standardcontextual"> </span><span style="mso-ligatures:standardcontextual"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#131B57;mso-ligatures:standardcontextual">School of Physics and Astronomy<br>
University of Nottingham</span><span style="mso-ligatures:standardcontextual"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#131B57;mso-ligatures:standardcontextual">Room B106b, Centre for Astronomy and Particle Theory</span><span style="mso-ligatures:standardcontextual"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#131B57;mso-ligatures:standardcontextual">University Park</span><span style="mso-ligatures:standardcontextual"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#131B57;mso-ligatures:standardcontextual">Nottingham, NG7 2RD, UK</span><span style="mso-ligatures:standardcontextual"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif;color:#1F497D;mso-ligatures:standardcontextual"> </span><span style="mso-ligatures:standardcontextual"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#131B57;mso-ligatures:standardcontextual">+44 (0) 115 95 16230<b> </b></span><b><span style="font-size:9.0pt;font-family:"Calibri",sans-serif;color:#131B57;mso-ligatures:standardcontextual">| </span></b><span style="mso-ligatures:standardcontextual"><a href="mailto:alfonso.aragon@nottingham.ac.uk"><span style="font-size:9.0pt;font-family:"Arial",sans-serif">alfonso.aragon@nottingham.ac.uk</span></a><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif;color:black;mso-ligatures:standardcontextual">URL:
</span><span style="mso-ligatures:standardcontextual"><a href="http://nottingham.ac.uk/physics/people/alfonso.aragon"><span style="font-family:"Calibri",sans-serif;color:#0563C1">http://nottingham.ac.uk/physics/people/alfonso.aragon</span></a><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-ligatures:standardcontextual">General teaching enquiries
</span><span style="font-size:11.0pt;mso-ligatures:standardcontextual"><a href="mailto:physics-teaching@nottingham.ac.uk"><span style="font-family:"Calibri",sans-serif;color:#0563C1">physics-teaching@nottingham.ac.uk</span></a><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-family:"Calibri",sans-serif">From:</span></b><span style="font-family:"Calibri",sans-serif"> Annie Robin via sdss4-general <sdss4-general@sdss.org>
<br>
<b>Sent:</b> 15 December 2025 11:33<br>
<b>To:</b> sdss4-general@sdss.org; Gillot Jonathan <jonathan.gillot@femto-st.fr><br>
<b>Subject:</b> [sdss4-general 4582] Postdoc opportunity<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p>Dear colleagues,<o:p></o:p></p>
<p>We emphasize the opportunity of financial support for a postdoc position in Besançon (France) to work on models of modified gravity and subsequent tests in galaxies. Below is the description of the subject. The position will be for 2 years. <o:p></o:p></p>
<p><i>In the ΛCDM framework, modelling the rotational velocities of galaxies relies on dark matter. There are many candidates (WIMPs, axions, scalar fields, etc.), but no particles have been detected to date. Alternatives propose modifying Newton's laws at
low accelerations (~10^(-10) m.s2) (i.e. MOND) to account for the observed rotation curves. However, these models often use ad hoc interpolation functions and acceleration scales to deviate from the Newtonian regime. A recent model - the quantum modified
inertia (QMI) - introduces a new principle of dynamics with minimal acceleration of quantum origin developed within the framework of special relativity (<a href="https://arxiv.org/abs/2507.11524">https://arxiv.org/abs/2507.11524</a>). </i><o:p></o:p></p>
<p><i>Based on this principle, a simple code has been developped that successfully recover several spiral rotation curves, and even the rising curve of dwarf galaxies that, in the LCDM theory, are difficult to explain. The post-doc work will be to improve the
code to apply it to various galaxy types. </i><o:p></o:p></p>
<p><i>Furthermore, it has been recently shown that the radial acceleration relation (RAR, see <a href="http://arxiv.org/abs/1610.08981">http://arxiv.org/abs/1610.08981</a>) proposed to support the MOND theories was excluded by the Cassini probe trajectory (<a href="https://arxiv.org/abs/2401.04796">https://arxiv.org/abs/2401.04796</a>).
One possibility for reconciling the RAR deduced from the SPARC galaxy data set (used by Lelli et al) with Cassini constraint is to refine the stellar-to-mass ratios. The postdoc will explore the sensitivity of the RAR to the stellar-to-mass ratio at different
wavelengths, using different hypotheses of Galactic evolution (IMF, star formation history, dust content...) through population synthesis modelling with existing codes.</i><o:p></o:p></p>
<p><i>At the present time the RAR is based mainly on one sample of galaxies (the SPARC sample). The postdoc will look for and explore other data sets that could confirm or rule it out, therefore constraining the modified gravitation or inertia model, or modified
it such that it best explains all available galaxy types, from massive galaxies to dwarfs, as well as the Cassini constraint.</i><o:p></o:p></p>
<p><o:p> </o:p></p>
<p>The candidate should have his/her PHD for less than 10 years and provide a summary of his/her <span class="b5">ca</span><span class="b4">re</span><span class="b3">er</span><span class="b4"> paths, a List of 5 principal publications, and main skills and expertises.
The financial support will be covered by the Region Bourgogne-Franche-Comté after a dedicated application form due by early january.</span><o:p></o:p></p>
<p>Interested candidates can contact Annie Robin (<a href="mailto:annie.robin@obs-besancon.fr">annie.robin@obs-besancon.fr</a>) and Jonathan Gillot (<a href="mailto:jonathan.gillot@femto-st.fr">jonathan.gillot@femto-st.fr</a>). Applications are requested before
28th december.<o:p></o:p></p>
<p>Best regards,<o:p></o:p></p>
<p><o:p> </o:p></p>
<pre>-- <o:p></o:p></pre>
<pre>Annie C. Robin<o:p></o:p></pre>
<pre>Institut Utinam, OSU Theta Franche-Comté-Bourgogne, France<o:p></o:p></pre>
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