物理与天体物理最新文献

{"title":"Wide-angle pion- Δ(1232) photoproduction","authors":"P. Kroll","doi":"10.1103/physrevd.111.094003","DOIUrl":"https://doi.org/10.1103/physrevd.111.094003","url":null,"abstract":"High-energy wide-angle photoproduction of π</a:mi>Δ</a:mi></a:math> final states is investigated within the handbag mechanism to twist-3 accuracy. In this approach the process amplitudes factorize in a hard partonic subprocess and in form factors which represent <d:math xmlns:d=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><d:mn>1</d:mn><d:mo>/</d:mo><d:mi>x</d:mi></d:math>-moments of <f:math xmlns:f=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><f:mi>p</f:mi><f:mo>−</f:mo><f:mi mathvariant=\"normal\">Δ</f:mi></f:math> transition generalized parton distributions (GPDs) at zero skewness. The subprocess, calculated to twist-3 accuracy, is the same as in pion photoproduction. The <i:math xmlns:i=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><i:mi>p</i:mi><i:mo>−</i:mo><i:mi mathvariant=\"normal\">Δ</i:mi></i:math> GPDs are related to the proton-proton GPDs exploiting large-<l:math xmlns:l=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><l:msub><l:mi>N</l:mi><l:mi>C</l:mi></l:msub></l:math> results. The proton-proton GPDs as well as the twist-2 and twist-3 pion distribution amplitudes appearing in the subprocess are taken from other work. Reasonable agreement with experiment is found in this almost parameter-free analysis. <jats:supplementary-material> <jats:copyright-statement>Published by the American Physical Society</jats:copyright-statement> <jats:copyright-year>2025</jats:copyright-year> </jats:permissions> </jats:supplementary-material>","PeriodicalId":20167,"journal":{"name":"Physical Review D","volume":"59 1","pages":""},"PeriodicalIF":5.0,"publicationDate":"2025-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143909901","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The third structure function","authors":"S P Miao, N C Tsamis, R P Woodard and B Yesilyurt","doi":"10.1088/1361-6382/adcfe9","DOIUrl":"https://doi.org/10.1088/1361-6382/adcfe9","url":null,"abstract":"We re-consider the graviton self-energy induced by a loop of massless, minimally coupled scalars on de Sitter background. On flat space background it can be represented as a sum of two tensor differential operators acting on scalar structure functions. On a general background these differential operators can be constructed from the linearized Ricci scalar and the linearized Weyl tensor. However, in cosmology one requires a third contribution which we derive here.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"1 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143910039","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Calculation method for eddy current effect of test mass in TianQin","authors":"Jia-Qi Wu, Xue-Yuan Li, Dan Peng, Hong-Mei Su and Qi Liu","doi":"10.1088/1361-6382/adcfea","DOIUrl":"https://doi.org/10.1088/1361-6382/adcfea","url":null,"abstract":"TianQin is proposed to detect gravitational wave signals at the frequency band of in space. Given that the residual acceleration noise of the test mass in TianQin is required to be below , all disturbing forces acting on the test mass should be estimated with the required precision. The magnetic force caused by eddy current is one of the error sources and should be treated seriously. In this paper, the eddy current effect is estimated by calculating the coupling between AC susceptibility and the applied ambient magnetic field. The proposed method demonstrates excellent agreement with direct calculations. The benefit of using the concept of AC susceptibility is that could be measured by precise experiment or calculated by FEM before launch, which improves the efficiency of calculation and increased the reliability and stability in space missions like TianQin.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"43 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143910041","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Critical behavior in the single flavor Thirring model in (2+1)D with Wilson kernel domain wall fermions","authors":"Simon Hands, Jude Worthy","doi":"10.1103/physrevd.111.094501","DOIUrl":"https://doi.org/10.1103/physrevd.111.094501","url":null,"abstract":"We present results of a lattice field theory simulation of the (&lt;/a:mo&gt;2&lt;/a:mn&gt;+&lt;/a:mo&gt;1&lt;/a:mn&gt;)&lt;/a:mo&gt;D&lt;/a:mi&gt;&lt;/a:mrow&gt;&lt;/a:math&gt; Thirring model with &lt;f:math xmlns:f=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"&gt;&lt;f:mi&gt;N&lt;/f:mi&gt;&lt;f:mo&gt;=&lt;/f:mo&gt;&lt;f:mn&gt;1&lt;/f:mn&gt;&lt;/f:math&gt; fermion flavors, using domain wall fermions. The model exhibits a U(2)-symmetry-breaking phase transition with the potential to define a UV-stable renormalization group fixed point. The novelty is the replacement of the Shamir kernel used in all previous work with the Wilson kernel, improving the action particularly with respect to the &lt;h:math xmlns:h=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"&gt;&lt;h:msub&gt;&lt;h:mi&gt;L&lt;/h:mi&gt;&lt;h:mi&gt;s&lt;/h:mi&gt;&lt;/h:msub&gt;&lt;h:mo stretchy=\"false\"&gt;→&lt;/h:mo&gt;&lt;h:mi&gt;∞&lt;/h:mi&gt;&lt;/h:math&gt; limit needed to recover U(2), now under much better control. Auxiliary field ensembles generated on &lt;k:math xmlns:k=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"&gt;&lt;k:msup&gt;&lt;k:mn&gt;16&lt;/k:mn&gt;&lt;k:mn&gt;3&lt;/k:mn&gt;&lt;/k:msup&gt;&lt;k:mo&gt;×&lt;/k:mo&gt;&lt;k:mn&gt;24&lt;/k:mn&gt;&lt;/k:math&gt; with varying self-interaction strength &lt;m:math xmlns:m=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"&gt;&lt;m:msup&gt;&lt;m:mi&gt;g&lt;/m:mi&gt;&lt;m:mn&gt;2&lt;/m:mn&gt;&lt;/m:msup&gt;&lt;/m:math&gt; and bare mass &lt;o:math xmlns:o=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"&gt;&lt;o:mi&gt;m&lt;/o:mi&gt;&lt;/o:math&gt; are used to measure the bilinear condensate order parameter &lt;q:math xmlns:q=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"&gt;&lt;q:mo stretchy=\"false\"&gt;⟨&lt;/q:mo&gt;&lt;q:mover accent=\"true\"&gt;&lt;q:mi&gt;ψ&lt;/q:mi&gt;&lt;q:mo stretchy=\"false\"&gt;¯&lt;/q:mo&gt;&lt;/q:mover&gt;&lt;q:mi&gt;i&lt;/q:mi&gt;&lt;q:msub&gt;&lt;q:mi&gt;γ&lt;/q:mi&gt;&lt;q:mn&gt;3&lt;/q:mn&gt;&lt;/q:msub&gt;&lt;q:mi&gt;ψ&lt;/q:mi&gt;&lt;q:mo stretchy=\"false\"&gt;⟩&lt;/q:mo&gt;&lt;/q:math&gt; with domain wall separations as large as &lt;w:math xmlns:w=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"&gt;&lt;w:msub&gt;&lt;w:mi&gt;L&lt;/w:mi&gt;&lt;w:mi&gt;s&lt;/w:mi&gt;&lt;/w:msub&gt;&lt;w:mo&gt;=&lt;/w:mo&gt;&lt;w:mn&gt;120&lt;/w:mn&gt;&lt;/w:math&gt;. The resulting &lt;y:math xmlns:y=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"&gt;&lt;y:msub&gt;&lt;y:mi&gt;L&lt;/y:mi&gt;&lt;y:mi&gt;s&lt;/y:mi&gt;&lt;/y:msub&gt;&lt;y:mo stretchy=\"false\"&gt;→&lt;/y:mo&gt;&lt;y:mi&gt;∞&lt;/y:mi&gt;&lt;/y:math&gt; extrapolation is used to fit an empirical equation of state modeling spontaneous symmetry breaking as &lt;bb:math xmlns:bb=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"&gt;&lt;bb:mi&gt;m&lt;/bb:mi&gt;&lt;bb:mo stretchy=\"false\"&gt;→&lt;/bb:mo&gt;&lt;bb:mn&gt;0&lt;/bb:mn&gt;&lt;/bb:math&gt;. The fit is remarkably stable and compelling, with the fitted critical exponents &lt;eb:math xmlns:eb=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"&gt;&lt;eb:msub&gt;&lt;eb:mi&gt;β&lt;/eb:mi&gt;&lt;eb:mi&gt;m&lt;/eb:mi&gt;&lt;/eb:msub&gt;&lt;eb:mo&gt;≃&lt;/eb:mo&gt;&lt;eb:mn&gt;2.4&lt;/eb:mn&gt;&lt;/eb:math&gt;, &lt;gb:math xmlns:gb=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"&gt;&lt;gb:mi&gt;δ&lt;/gb:mi&gt;&lt;gb:mo&gt;≃&lt;/gb:mo&gt;&lt;gb:mn&gt;1.3&lt;/gb:mn&gt;&lt;/gb:math&gt; differing markedly from previous estimates. The associated susceptibility exhibits a mass hierarchy in line with physical expectations, again unlike previous estimates. Schwinger-Dyson equation (SDE) solutions of the Thirring model exploiting a hidden local symmetry in the action are reviewed and analytic predictions present","PeriodicalId":20167,"journal":{"name":"Physical Review D","volume":"139 1","pages":""},"PeriodicalIF":5.0,"publicationDate":"2025-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143910262","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Emergent hydrodynamic mode on SU(2) plaquette chains and quantum simulation","authors":"Francesco Turro, Xiaojun Yao","doi":"10.1103/physrevd.111.094502","DOIUrl":"https://doi.org/10.1103/physrevd.111.094502","url":null,"abstract":"We search for emergent hydrodynamic modes in real-time Hamiltonian dynamics of 2</a:mn>+</a:mo>1</a:mn></a:mrow></a:math>-dimensional SU(2) lattice gauge theory on a quasi-one-dimensional plaquette chain, by numerically computing symmetric correlation functions of energy densities on lattice sizes of about 20 with the local Hilbert space truncated at <c:math xmlns:c=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><c:msub><c:mi>j</c:mi><c:mi>max</c:mi></c:msub><c:mo>=</c:mo><c:mfrac><c:mn>1</c:mn><c:mn>2</c:mn></c:mfrac></c:math>. Because of the Umklapp processes, we only find a mode for energy diffusion. The symmetric correlator exhibits transport peak near zero frequency with a width approximately proportional to momentum squared at small momentum, when the system is fully quantum ergodic, as indicated by the eigenenergy level statistics. This transport peak leads to a power-law <e:math xmlns:e=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><e:msup><e:mi>t</e:mi><e:mrow><e:mo>−</e:mo><e:mfrac><e:mn>1</e:mn><e:mn>2</e:mn></e:mfrac></e:mrow></e:msup></e:math> decay of the symmetric correlator at late time, also known as the long-time tail, as well as diffusionlike spreading in position space. We also introduce a quantum algorithm for computing the symmetric correlator on a quantum computer and find it gives results consistent with exact diagonalization when tested on the IBM emulator. Finally we discuss the future prospect of searching for the sound modes. <jats:supplementary-material> <jats:copyright-statement>Published by the American Physical Society</jats:copyright-statement> <jats:copyright-year>2025</jats:copyright-year> </jats:permissions> </jats:supplementary-material>","PeriodicalId":20167,"journal":{"name":"Physical Review D","volume":"29 1","pages":""},"PeriodicalIF":5.0,"publicationDate":"2025-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143910263","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Improved Bayesian regularization of inverse problems in vibrations and acoustics using noise-only measurements","authors":"Keaton Coletti ,&nbsp;R. Benjamin Davis ,&nbsp;Ryan Schultz","doi":"10.1016/j.apacoust.2025.110756","DOIUrl":"10.1016/j.apacoust.2025.110756","url":null,"abstract":"<div><div>This paper studies Tikhonov regularization (ridge regression) parameter selection for problems in vibrations and acoustics. The selection method is based on a popular Bayesian method, but it incorporates measurements of sensor noise. The regularization parameter is closely related to the ratio of system input energy to noise energy, so noise measurements inform the inference procedure and improve parameter identification. In cases where standard Bayesian regularization identifies zero as the optimal regularization parameter, noise measurements guarantee a unique nonzero optimum. Sufficient theoretical criteria are developed for this guarantee. The method is verified in even-determined and under-determined configurations in an acoustic source localization simulation and a vibration load identification experiment. It is shown to yield significant improvements over existing empirical Bayesian regularization. Improvements are larger in the even-determined case and smaller in the under-determined case, wherein the inverse solution is less sensitive to the regularization parameter.</div></div>","PeriodicalId":55506,"journal":{"name":"Applied Acoustics","volume":"238 ","pages":"Article 110756"},"PeriodicalIF":3.4,"publicationDate":"2025-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143903400","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Influence of strong electron irradiation on fluctuation conductivity and pseudogap in YBa2Cu3O7−δ single crystals","authors":"A. L. Solovjov, K. Rogacki, N. V. Shytov, E. V. Petrenko, L. V. Bludova, A. Chroneos, R. V. Vovk","doi":"10.1103/physrevb.111.174508","DOIUrl":"https://doi.org/10.1103/physrevb.111.174508","url":null,"abstract":"The effect of high-energy electron irradiation on the temperature dependences of the resistivity ρ(), fluctuation conductivity (FLC), and pseudogap (PG) Δ*() of YB&lt;/a:mi&gt;a&lt;/a:mi&gt;2&lt;/a:mn&gt;&lt;/a:msub&gt;C&lt;/a:mi&gt;u&lt;/a:mi&gt;3&lt;/a:mn&gt;&lt;/a:msub&gt;O&lt;/a:mi&gt;7&lt;/a:mn&gt;−&lt;/a:mo&gt;δ&lt;/a:mi&gt;&lt;/a:mrow&gt;&lt;/a:msub&gt;&lt;/a:mrow&gt;&lt;/a:math&gt; (YBCO) single crystals containing virtually no twins was studied. A linear increase in the resistivity and a linear decrease in the superconducting (SC) transition temperature &lt;f:math xmlns:f=\"http://www.w3.org/1998/Math/MathML\"&gt;&lt;f:msub&gt;&lt;f:mi&gt;T&lt;/f:mi&gt;&lt;f:mi&gt;c&lt;/f:mi&gt;&lt;/f:msub&gt;&lt;/f:math&gt; with increasing irradiation doses φ were observed. For relatively small φ, the linear &lt;g:math xmlns:g=\"http://www.w3.org/1998/Math/MathML\"&gt;&lt;g:msub&gt;&lt;g:mi&gt;T&lt;/g:mi&gt;&lt;g:mi&gt;c&lt;/g:mi&gt;&lt;/g:msub&gt;&lt;/g:math&gt; can be described by the Abrikosov-Gorkov (AG) pair breaking theory, and for large φ, by the Emery-Kivelson (EK) theory, which takes into account the suppression of &lt;h:math xmlns:h=\"http://www.w3.org/1998/Math/MathML\"&gt;&lt;h:msub&gt;&lt;h:mi&gt;T&lt;/h:mi&gt;&lt;h:mi&gt;c&lt;/h:mi&gt;&lt;/h:msub&gt;&lt;/h:math&gt; by quantum phase fluctuations caused by irradiation defects. As FLC shows, at the average value of &lt;i:math xmlns:i=\"http://www.w3.org/1998/Math/MathML\"&gt;&lt;i:mrow&gt;&lt;i:msub&gt;&lt;i:mi&gt;φ&lt;/i:mi&gt;&lt;i:mn&gt;3&lt;/i:mn&gt;&lt;/i:msub&gt;&lt;i:mo&gt;=&lt;/i:mo&gt;&lt;i:mn&gt;2.5&lt;/i:mn&gt;&lt;i:mo&gt;×&lt;/i:mo&gt;&lt;i:msup&gt;&lt;i:mrow&gt;&lt;i:mn&gt;10&lt;/i:mn&gt;&lt;/i:mrow&gt;&lt;i:mn&gt;19&lt;/i:mn&gt;&lt;/i:msup&gt;&lt;i:mspace width=\"0.16em\"/&gt;&lt;i:mi mathvariant=\"normal\"&gt;e&lt;/i:mi&gt;&lt;i:mo&gt;/&lt;/i:mo&gt;&lt;i:mi mathvariant=\"normal\"&gt;c&lt;/i:mi&gt;&lt;i:msup&gt;&lt;i:mrow&gt;&lt;i:mi mathvariant=\"normal\"&gt;m&lt;/i:mi&gt;&lt;/i:mrow&gt;&lt;i:mn&gt;2&lt;/i:mn&gt;&lt;/i:msup&gt;&lt;/i:mrow&gt;&lt;/i:math&gt;, which corresponds to the AG-EK crossover, the distance between the conducting &lt;n:math xmlns:n=\"http://www.w3.org/1998/Math/MathML\"&gt;&lt;n:mrow&gt;&lt;n:mi&gt;Cu&lt;/n:mi&gt;&lt;n:msub&gt;&lt;n:mi mathvariant=\"normal\"&gt;O&lt;/n:mi&gt;&lt;n:mn&gt;2&lt;/n:mn&gt;&lt;/n:msub&gt;&lt;/n:mrow&gt;&lt;/n:math&gt; planes, &lt;p:math xmlns:p=\"http://www.w3.org/1998/Math/MathML\"&gt;&lt;p:msub&gt;&lt;p:mi&gt;d&lt;/p:mi&gt;&lt;p:mn&gt;01&lt;/p:mn&gt;&lt;/p:msub&gt;&lt;/p:math&gt;, as well as the coherence lengths along the &lt;q:math xmlns:q=\"http://www.w3.org/1998/Math/MathML\"&gt;&lt;q:mi&gt;c&lt;/q:mi&gt;&lt;/q:math&gt; axis, &lt;r:math xmlns:r=\"http://www.w3.org/1998/Math/MathML\"&gt;&lt;r:msub&gt;&lt;r:mi&gt;ξ&lt;/r:mi&gt;&lt;r:mi mathvariant=\"normal\"&gt;c&lt;/r:mi&gt;&lt;/r:msub&gt;&lt;/r:math&gt;(0), and the region of SC fluctuations, &lt;t:math xmlns:t=\"http://www.w3.org/1998/Math/MathML\"&gt;&lt;t:mrow&gt;&lt;t:mi mathvariant=\"normal\"&gt;Δ&lt;/t:mi&gt;&lt;t:msub&gt;&lt;t:mi&gt;T&lt;/t:mi&gt;&lt;t:mi&gt;fl&lt;/t:mi&gt;&lt;/t:msub&gt;&lt;/t:mrow&gt;&lt;/t:math&gt;, increase sharply, and the two-dimensional contribution of the Maki-Thompson fluctuations (2D-MT) unexpectedly changes to the two-dimensional contribution of the Aslamazov-Larkin (2D-AL). Surprisingly, no features in ρ(φ) and &lt;v:math xmlns:v=\"http://www.w3.org/1998/Math/MathML\"&gt;&lt;v:msub&gt;&lt;v:mi&gt;T&lt;/v:mi&gt;&lt;v:mi&gt;c&lt;/v:mi&gt;&lt;/v:msub&gt;&lt;/v:math&gt;(φ) indicating the AG-EK crossover are observed. At the same time, at &lt;w:math xmlns:w=\"http://www.w3.org/1998/Math/MathML\"&gt;&lt;w:msub&gt;&lt;w:mi&gt;φ&lt;/w:mi&gt;&lt;w:mn&gt;3&lt;/w:mn&gt;&lt;/w:msub&gt;&lt;/w:math&gt;, a sharp increase in the opening temperature of PG, *, as well as the value of PG, Δ*, is observed, whic","PeriodicalId":20082,"journal":{"name":"Physical Review B","volume":"43 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143909720","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Altermagnetic instabilities from quantum geometry","authors":"Niclas Heinsdorf","doi":"10.1103/physrevb.111.174407","DOIUrl":"https://doi.org/10.1103/physrevb.111.174407","url":null,"abstract":"Altermagnets are a newly identified type of collinear antiferromagnetism with vanishing net magnetic moment, characterized by lifted Kramers' degeneracy in parts of the Brillouin zone. Their time-reversal symmetry-broken band structure has been observed experimentally and is theoretically well understood. On the contrary, altermagnetic fluctuations and the formation of the corresponding instabilities remains largely unexplored. We establish a correspondence between the quantum metric of normal and the altermagnetic spin-splitting of ordered phases. We analytically derive a criterion for the formation of instabilities and show that the quantum metric favors altermagnetism. We recover the expression for conventional q</a:mi>=</a:mo>0</a:mn></a:mrow></a:math> instabilities where the spin-splitting terms of the normal-state model are locally absent. As an example, we construct an effective model of MnTe and illustrate the relationship between quantum geometry and altermagnetic fluctuations by explicitly computing the quantum metric and the generalized magnetic susceptibility. <jats:supplementary-material> <jats:copyright-statement>Published by the American Physical Society</jats:copyright-statement> <jats:copyright-year>2025</jats:copyright-year> </jats:permissions> </jats:supplementary-material>","PeriodicalId":20082,"journal":{"name":"Physical Review B","volume":"110 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143909721","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Synthetic cells get into shape","authors":"Jaime Agudo-Canalejo, Hanumantha Rao Vutukuri","doi":"10.1038/s41567-025-02906-9","DOIUrl":"https://doi.org/10.1038/s41567-025-02906-9","url":null,"abstract":"Shape changes in biological cells are driven by an active network of biopolymers. Now, similar deformations are observed in synthetic cell membranes.","PeriodicalId":19100,"journal":{"name":"Nature Physics","volume":"2 1","pages":""},"PeriodicalIF":19.6,"publicationDate":"2025-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143909804","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Topological momentum skyrmions in Mie scattering fields","authors":"Peiyang Chen, Kai Xiang Lee, Tim Colin Meiler, Yijie Shen","doi":"10.1515/nanoph-2025-0071","DOIUrl":"https://doi.org/10.1515/nanoph-2025-0071","url":null,"abstract":"How topologies play a role in light–matter interaction is of great interest in control and transfer of topologically-protected structures. These topological structures such as skyrmions and merons have not yet been found in canonical momentum fields, which are fundamental in mechanical transfer between optical and matter fields. Here, we reveal the universality of generating skyrmionic structures in the canonical momentum of light in multipole Mie scattering fields. We demonstrate the distinct topological stability of canonical momentum skyrmions and merons, and compare with well-studied Poynting vector and optical spin fields. The study of these fields allow for a clean and direct approach to measuring and quantifying energetic structures in optical fields, through observable radiation pressure. Our work lays the foundation for exploring new topologically nontrivial phenomena in optical forces, metamaterial design, and light–matter interaction.","PeriodicalId":19027,"journal":{"name":"Nanophotonics","volume":"43 1","pages":""},"PeriodicalIF":7.5,"publicationDate":"2025-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143910077","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}