arXiv (Cornell University)最新文献_第3页

The disk of the eruptive protostar V900 Mon; a MATISSE/VLTI and MUSE/VLT perspective 爆发的原恒星V900月亮的盘;马蒂斯/VLTI和缪斯/VLT透视

arXiv (Cornell University) Pub Date : 2023-11-13 DOI: 10.48550/arxiv.2311.07250

Lykou, F., Ábrahám, P., de Miera, F. Cruz-Sáenz, Varga, J., Kóspál, Á., Bouwman, J., Chen, L., Kraus, S., Sitko, M. L., Russell, R. W., Pikhartova, M.

{"title":"The disk of the eruptive protostar V900 Mon; a MATISSE/VLTI and MUSE/VLT\u0000 perspective","authors":"Lykou, F., Ábrahám, P., de Miera, F. Cruz-Sáenz, Varga, J., Kóspál, Á., Bouwman, J., Chen, L., Kraus, S., Sitko, M. L., Russell, R. W., Pikhartova, M.","doi":"10.48550/arxiv.2311.07250","DOIUrl":"https://doi.org/10.48550/arxiv.2311.07250","url":null,"abstract":"In this work, we study the silicate dust content in the disk of one of the youngest eruptive stars, V900 Mon, at the highest angular resolution probing down to the inner 10 au of said disk, and study the historical evolution of the system traced in part by a newly discovered emission clump. We performed high-angular resolution mid-infrared interferometric observations of V900 Mon with MATISSE/VLTI with a spatial coverage ranging from 38-m to 130-m baselines, and compared them to archival MIDI/VLTI data. We also mined and re-analyzed archival optical and infrared photometry of the star to study its long-term evolution since its eruption in the 1990s. We complemented our findings with integral field spectroscopy data from MUSE/VLT. The MATISSE/VLTI data suggest a radial variation of the silicate feature in the dusty disk, whereby at large spatial scales ($geq10$ au) the protostellar disk's emission is dominated by large-sized ($geq1,mu m$) silicate grains, while at smaller spatial scales and closer to the star ($leq5$ au), silicate emission is absent suggesting self-shielding. We propose that the self-shielding may be the result of small dust grains at the base of the collimated CO outflow previously detected by ALMA. A newly discovered knot in the MUSE/VLT data, located at a projected distance approximately 27,000 au from the star, is co-aligned with the molecular gas outflow at a P.A. of $250^o$ ($pm5^o$) consistent with the position angle and inclination of the disk. The knot is seen in emission in H$alpha$, [N II], and the [S II] doublet and its kinematic age is about 5150 years. This ejected material could originate from a previous eruption.","PeriodicalId":496270,"journal":{"name":"arXiv (Cornell University)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136352657","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Hydrodynamical approach to chirality production during axion inflation 轴子膨胀过程中手性产生的流体力学方法

arXiv (Cornell University) Pub Date : 2023-11-13 DOI: 10.48550/arxiv.2311.07429

Gorbar, E. V., Momot, A. I., Prikhodko, O. O., Teslyk, O. M.

引用次数: 0

Transpose Attack: Stealing Datasets with Bidirectional Training 转置攻击:用双向训练窃取数据集

arXiv (Cornell University) Pub Date : 2023-11-13 DOI: 10.48550/arxiv.2311.07389

Amit, Guy, Levy, Mosh, Mirsky, Yisroel

引用次数: 0

Smith-Purcell radiation from time grating 时间光栅的史密斯-珀塞尔辐射

arXiv (Cornell University) Pub Date : 2023-11-13 DOI: 10.48550/arxiv.2311.07381

Zhu, Juan-Feng, Nussupbekov, Ayan, Zhou, Wenjie, Song, Zicheng, Wang, Xuchen, Zhang, Zi-Wen, Du, Chao-Hai, Bai, Ping, Png, Ching Eng, Qiu, Cheng-Wei, Wu, Lin

引用次数: 0

Cylindric Schur functions 圆柱舒尔函数

arXiv (Cornell University) Pub Date : 2023-11-13 DOI: 10.48550/arxiv.2311.07382

Alexandersson, Per, Oğuz, Ezgi Kantarci

引用次数: 0

Neutron calibrations in dark matter searches: the ANAIS-112 case 暗物质搜索中的中子校准:ANAIS-112案例

arXiv (Cornell University) Pub Date : 2023-11-13 DOI: 10.48550/arxiv.2311.07290

Pardo, T., Amaré, J., Apilluelo, J., Cebrián, S., Cintas, D., Coarasa, I., García, E., Martínez, M., Oliván, M. A., Ortigoza, Y., de Solórzano, A. Ortiz, Pellicer, M., Puimedón, J., Salinas, A., Sarsa, M. L., Villar, P.

{"title":"Neutron calibrations in dark matter searches: the ANAIS-112 case","authors":"Pardo, T., Amaré, J., Apilluelo, J., Cebrián, S., Cintas, D., Coarasa, I., García, E., Martínez, M., Oliván, M. A., Ortigoza, Y., de Solórzano, A. Ortiz, Pellicer, M., Puimedón, J., Salinas, A., Sarsa, M. L., Villar, P.","doi":"10.48550/arxiv.2311.07290","DOIUrl":"https://doi.org/10.48550/arxiv.2311.07290","url":null,"abstract":"ANAIS is a direct dark matter detection experiment whose goal is to confirm or refute in a model independent way the positive annual modulation signal claimed by DAMA/LIBRA. Consisting of 112.5 kg of NaI(Tl) scintillators, ANAIS-112 is taking data at the Canfranc Underground Laboratory in Spain since August, 2017. Results corresponding to the analysis of three years of data are compatible with the absence of modulation and incompatible with DAMA/LIBRA. However, testing this signal relies on the knowledge of the scintillation quenching factors (QF), which measure the relative efficiency for the conversion into light of the nuclear recoil energy with respect to the same energy deposited by electrons. Previous measurements of the QF in NaI(Tl) show a large dispersion. Consequently, in order to better understand the response of the ANAIS-112 detectors to nuclear recoils, a specific neutron calibration program has been developed. This program combines two different approaches: on the one hand, QF measurements were carried out in a monoenergetic neutron beam; on the other hand, the study presented here aims at the evaluation of the QF by exposing directly the ANAIS-112 crystals to neutrons from low activity $^{252}$Cf sources, placed outside the lead shielding. Comparison between these onsite neutron measurements and detailed GEANT4 simulations will be presented, confirming that this approach allows testing different QF models.","PeriodicalId":496270,"journal":{"name":"arXiv (Cornell University)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136352796","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Observation of quantum entanglement in top-quark pairs using the ATLAS detector 用ATLAS探测器观察顶夸克对中的量子纠缠

arXiv (Cornell University) Pub Date : 2023-11-13 DOI: 10.48550/arxiv.2311.07288

ATLAS Collaboration

{"title":"Observation of quantum entanglement in top-quark pairs using the ATLAS\u0000 detector","authors":"ATLAS Collaboration","doi":"10.48550/arxiv.2311.07288","DOIUrl":"https://doi.org/10.48550/arxiv.2311.07288","url":null,"abstract":"We report the highest-energy observation of entanglement, in top$-$antitop quark events produced at the Large Hadron Collider, using a proton$-$proton collision data set with a center-of-mass energy of $sqrt{s}=13$ TeV and an integrated luminosity of 140 fb$^{-1}$ recorded with the ATLAS experiment. Spin entanglement is detected from the measurement of a single observable $D$, inferred from the angle between the charged leptons in their parent top- and antitop-quark rest frames. The observable is measured in a narrow interval around the top$-$antitop quark production threshold, where the entanglement detection is expected to be significant. It is reported in a fiducial phase space defined with stable particles to minimize the uncertainties that stem from limitations of the Monte Carlo event generators and the parton shower model in modelling top-quark pair production. The entanglement marker is measured to be $D=-0.547 pm 0.002~text{(stat.)} pm 0.021~text{(syst.)}$ for $340 < m_{tbar{t}} < 380 $ GeV. The observed result is more than five standard deviations from a scenario without entanglement and hence constitutes both the first observation of entanglement in a pair of quarks and the highest-energy observation of entanglement to date.","PeriodicalId":496270,"journal":{"name":"arXiv (Cornell University)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136352799","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

SOLPS-ITER simulation of an X-point radiator in TCV TCV中x点辐射体的SOLPS-ITER模拟

arXiv (Cornell University) Pub Date : 2023-11-13 DOI: 10.48550/arxiv.2311.07295

Sun, G.

{"title":"SOLPS-ITER simulation of an X-point radiator in TCV","authors":"Sun, G.","doi":"10.48550/arxiv.2311.07295","DOIUrl":"https://doi.org/10.48550/arxiv.2311.07295","url":null,"abstract":"SOLPS-ITER simulation is performed to reproduce the X-point radiator recently observed in nitrogen-seeded TCV experiments, which is a scenario that may be favorable to solve the power exhaust problems in future fusion devices. The simulations reveal the transition from the detached regime without XPR to the XPR regime, when increasing the nitrogen seeding rate. A cold X-point core surrounded by ionizing and radiative mentals is formed inside the separatrix and slightly above the X-point, where more than 90% of the total input power is dissipated. The cold X-point core exhibits a temperature of approximately 1eV and features high recombination rate to host the convective fluxes from the ionizing mental. Increasing nitrogen seeding rate also moves the nitrogen ionization front away from the target faster than the nitrogen stagnation point, which enhances the divertor nitrogen leakage to the main chamber and benefits the XPR region cooling. Carbon radiation decreases as the nitrogen seeding increases, and carbon radiation contributes to above 5% of the core impurity radiation before entering the XPR, which decreases to 2.8% when reaching the XPR. Both baffled and unbaffled divertor geometries are simulated and compared, showing that baffles facilitate the access to XPR by increasing the X-point neutral density, but requires higher seeding rate to enter the XPR regime.","PeriodicalId":496270,"journal":{"name":"arXiv (Cornell University)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136352801","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Learning Arithmetic Formulas in the Presence of Noise: A General Framework and Applications to Unsupervised Learning 存在噪声的算术公式学习:一个通用框架及其在无监督学习中的应用

arXiv (Cornell University) Pub Date : 2023-11-13 DOI: 10.48550/arxiv.2311.07284

Chandra, Pritam, Garg, Ankit, Kayal, Neeraj, Mittal, Kunal, Sinha, Tanmay

引用次数: 0

Unusual chemical bond and spectrum of beryllium dimer in ground $X^1Sigma_g^+$ state 铍二聚体在X^1Sigma_g^+$基态下的异常化学键和光谱

arXiv (Cornell University) Pub Date : 2023-11-13 DOI: 10.48550/arxiv.2311.07378

Mitin, A. V., Gusev, A. A., Chuluunbaatar, O., Vinitsky, S. I., Derbov, V. L., Hai, Luong Le

{"title":"Unusual chemical bond and spectrum of beryllium dimer in ground\u0000 $X^1Sigma_g^+$ state","authors":"Mitin, A. V., Gusev, A. A., Chuluunbaatar, O., Vinitsky, S. I., Derbov, V. L., Hai, Luong Le","doi":"10.48550/arxiv.2311.07378","DOIUrl":"https://doi.org/10.48550/arxiv.2311.07378","url":null,"abstract":"This review outlines the main results which show the dual nature of the chemical bond in diatomic beryllium molecule in the ground $X^1Sigma_g^+$ state. It has been shown that the beryllium atoms are covalently bound at low-lying vibrational energy levels ({nu}=0-4), while at higher ones ({nu}=5-11) they are bound by van der Waals forces near the right turning points. High precision ab initio quantum calculations of Be$_2$ resulted in the development of the modified expanded Morse oscillator potential function which contains all twelve vibrational energy levels [A.V. Mitin, Chem. Phys. Lett. 682, 30 (2017)]. The dual nature of chemical bond in Be$_2$ is evidenced as a sharp corner on the attractive branch of the ground state potential curve. Moreover, it has been found that the Douglas-Kroll-Hess relativistic corrections also show a sharp corner when presented in dependence on the internuclear separation. The difference in energy between the extrapolated and calculated multi-reference configuration interaction energies in dependence on the internuclear separation also exhibits singular point in the same region. The other problems of ab initio quantum calculations of the beryllium dimer are also discussed. Calculated spectrum of vibrational-rotational bound states and new metastable states of the beryllium dimer in the ground state important for laser spectroscopy are presented. The vibration problem was solved for the modified expanded Morse oscillator potential function and for the potential function obtained with Slater-type orbitals [M. Lesiuk et al, Chem. Theory Comput. 15, 2470 (2019)]. The theoretical upper and lower estimates of the spectrum of vibrational-rotational bound states and the spectrum of rotational-vibrational metastable states with complex-valued energy eigenvalues and the scattering length in the beryllium dimer are presented.","PeriodicalId":496270,"journal":{"name":"arXiv (Cornell University)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136352811","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0