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88<script type="text/javascript"> 89 algoliasearchNetlify({ 90 appId: 'UKFG0RW50U', 91 apiKey: 'fba1d4fb70e6258abf51de96fda83b04', 92 siteId: 'adf6a35d-89cc-457b-8626-3489d6b32b97', 93 branch: 'main', 94 selector: 'div#search', 95 detached: true, 96 debug: true, 97 placeholder: 'Search...', 98 theme: { 99 mark: 'var(--headings-color)', 100 background: 'var(--navbar-default-bg)', 101 selected: 'var(--dark-well-bg)', 102 text: 'var(--body-color)', 103 colorSourceIcon: '#d6d6e7', 104 } 105 }); 106</script>
106 107 108<style> 109 .aa-DetachedContainer--modal{ 110 top:100px 111 } 112 .aa-DetachedSearchButton{ 113 border: 0;} 114 .aa-List{ 115 margin-top:20px} 116 117 .aa-Item .aa-ItemTitle{ 118 font-weight: 500; 119 } 120 .aa-ItemContent mark{ 121 font-weight: 500; 122 padding: 0; 123 padding-right: 0.1em; 124 } 125</style> 126 127 128 <div class="container-fluid"> 129 <div class="row"><article class="post" itemscope itemtype="http://schema.org/BlogPosting"> 130 <header class="post-header"> 131 <h1 class="post-title" itemprop="name headline">Evaporative damping, SPGPE complete!</h1> 132 <p class="post-meta"> 133 <time 134 datetime="2026-02-06T00:00:00+00:00" 135 itemprop="datePublished" 136 >6th February 2026</time 137 > 138 </p> 139 </header> 140 141 <div class="post-wrapper"> 142 <div class="post-main"> 143 <div class="post-content" itemprop="articleBody"><p>PhD student Nils Krause has developed a reservoir theory of a highly nonlinear reservoir interaction process:</p> 144 145<p><a href="https://arxiv.org/abs/2512.06220">Evaporative damping in open systems theory of Bose-Einstein condensates</a>.</p> 146 147<p>Previously regarded as unimportant (a weak surface term), evaporative damping is shown to be comparable to number damping in regimes of high phase space density. Both processes are weaker than energy damping, which is the dominant reservoir interaction in this regime. 148At low phase space dentisy - the critical regime - all three reservoir interaction process are important.</p> 149 150<p>The high nonlinearity of evaporative damping poses challenges for analytical and numerical treatments. Our work provides a Wigner phase space derivation of the equations of motion, and some useful analytic bounds and estimates of the physical significance of evaporative damping. We also carry out a dimensional reduction to provide an effective treatment in systems tightly confined along one or two spatial dimensions.</p> 151 152<p>This work completes the first-principles reservoir theory of high-temperature Bose-Einstein condensates.</p> 153 154<p>Congratulations Nils!</p> 155</div> 156 <div class="post-image"> 157 <img 158 src="/assets/images/news/evap.png" 159 /> 160 </div> 161 </div> 162 163 164 </div> 165</article></div> 166 </div> 167 168 <div id="footer" class="panel"> 169 <div class="panel-footer"> 170 <div class="container-fluid"> 171 <div class="row"> 172 173 <div class="col-sm-4"> 174 <strong> Contact: </strong><br /> 175 Department of Physics, Science III <br /> 176 University of Otago<br /> 177 Dunedin 9054<br /> 178 New Zealand 179 (<a href="https://maps.app.goo.gl/AKNRP6dSpe4GFBy38" 180 >Maps and direction</a 181 >) 182 </div> 183 184 <div class="col-sm-4"> 185 <strong>Funding: </strong><br /> 186 <ul class="no-bullet"> 187 <li> - Dodd-Walls Centre <a href="https://www.doddwalls.ac.nz"> (DWC)</a> 188 189 <li>
189 - Marsden Fund <a href="https://www.royalsociety.org.nz/what-we-do/funds-and-opportunities/marsden/"> (Marsden)</a> 190 191 <li> - Rutherford Discovery Fellowship <a href="https://www.royalsociety.org.nz/what-we-do/funds-and-opportunities/rutherford-discovery-fellowships/rutherford-discovery-fellowship-recipients/search-rutherford-discovery-fellowship-awards/?Years=2010&SearchTerm=bradley&action_doFundSearch=Search"> (RDF)</a> 192 193 </ul> 194 </div> 195 196 197 198 <div class="col-sm-4"> 199 <strong>Licence: </strong><br> 200 201 2024 - Ashton Bradley <br /> 202 <a href="https://github.com/AshtonSBradley/quantumfluids">Open source </a> with MIT Licence <br /> 203 Made with <a href="https://jekyllrb.com">Jekyll</a><br> 204 <a href="https://www.ashtonbradley.nz/aboutwebsite.html" 205 >Copy 206 </a> 207 and modify it for your group 208 209 </div> 210 </div> 211 </div> 212 </div> 213 214</div> 215 216 217 218 219 220 </body> 221</html> 222
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