检索结果-内蒙古大学图书馆

Letter to the editor and comments on: Intravital dynamic and correlative imaging reveals diffusion-dominated canalicular and flow-augmented ductular bile flux

arXiv

引用

arXiv 2020年

作者： Brusch, Lutz Kalaidzidis, Yannis Meyer, Kirstin Sbalzarini, Ivo F. Zerial, Marino Center for Information Services and High Performance Computing Technische Universität Dresden DresdenSaxony01062 Germany Max Planck Institute of Molecular Cell Biology and Genetics DresdenSaxony01307 Germany UCSF Cardiovascular Research Institute Department of Biochemistry and Biophysics California United States Chair of Scientific Computing for Systems Biology Faculty of Computer Science Technische Universität Dresden DresdenSaxony01187 Germany Center for Systems Biology Dresden DresdenSaxony01307 Germany Cluster of Excellence Physics of Life Technische Universität Dresden DresdenSaxony01187 Germany

Bile, the central metabolic product of the liver, is secreted by hepatocytes into bile canaliculi (BC), tubular subcellular structures of 0.5-2 µm diameter which are formed by the apical membranes of juxtaposed hepatocytes. BC interconnect to build a highly ramified 3D network that collects and transports bile towards larger interlobular bile ducts (IBD). The transport mechanism of bile is of fundamental interest and the current text-book model of „osmotic canalicular bile flow", i.e. enforced by osmotic water influx, has recently been quantitatively verified based on flux measurements and BC contractility (Meyer et al., 2017) but challenged in the article entitled "Intravital dynamic and correlative imaging reveals diffusion-dominated canalicular and flow-augmented ductular bile flux" (Vartak et al., 2020). We feel compelled to share a series of arguments that question the key conclusions of this study (Vartak et al., 2020), particularly because it risks to be misinterpreted and misleading for the field in view of potential clinical applications. We summarized the arguments in the following 8 points. © 2020, CC BY-NC-ND.

关键词： Osmosis

来源：评论

学校读者我要写书评

暂无评论

Machine Learning Templates for QCD Factorization in the Search for physics beyond the Standard Model

arXiv

引用

arXiv 2019年

作者： Lin, Joshua Bhimji, Wahid Nachman, Benjamin Department of Physics University of California Berkeley BerkeleyCA94720 United States National Energy Research Scientific Computing Center BerkeleyCA94720 United States Physics Division Lawrence Berkeley National Laboratory BerkeleyCA94720 United States

High-multiplicity all-hadronic final states are an important, but difficult final state for searching for physics beyond the Standard Model. A powerful search method is to look for large jets with accidental substructure due to multiple hard partons falling within a single jet. One way for estimating the background in this search is to exploit an approximate factorization in quantum chromodynamics whereby the jet mass distribution is determined only by its kinematic properties. Traditionally, this approach has been executed using histograms constructed in a background-rich region. We propose a new approach based on Generative Adversarial Networks (GANs). These neural network approaches are naturally unbinned and can be readily conditioned on multiple jet properties. In addition to using vanilla GANs for this purpose, a modification to the traditional WGAN approach has been investigated where weight clipping is replaced by drawing weights from a naturally compact set (in this case, the circle). Both the vanilla and modified WGAN approaches significantly outperform the histogram method, especially when modeling the dependence on features not used in the histogram construction. These results can be useful for enhancing the sensitivity of LHC searches to high-multiplicity final states involving many quarks and gluons and serve as a useful benchmark where GANs may have immediate benefit to the HEP community. Copyright © 2019, The Authors. All rights reserved.

关键词： Graphic methods

来源：评论

学校读者我要写书评

暂无评论

π-anisotropy: A nanocarbon route to hard magnetism

引用

Physical Review B 2020年第6期101卷 060408(R)-060408(R)页

作者： Timothy Moorsom Shoug Alghamdi Sean Stansill Emiliano Poli Gilberto Teobaldi Marijan Beg Hans Fangohr Matt Rogers Zabeada Aslam Mannan Ali B. J. Hickey Oscar Cespedes School of Physics and Astronomy University of Leeds Leeds LS2 9JT United Kingdom Department of Physics Taibah University Medina 42331 Saudi Arabia Scientific Computing Department STFC-UKRI Rutherford Appleton Laboratory OX11 0QX Didcot United Kingdom Beijing Computational Science Research Center 100193 Beijing China Stephenson Institute for Renewable Energy Department of Chemistry University of Liverpool Liverpool L69 3BX United Kingdom School of Chemistry University of Southampton Southampton SO17 1BJ United Kingdom Faculty of Engineering and Physical Sciences University of Southampton Southampton United Kingdom European XFEL GmbH Holzkoppel 4 22869 Schenefeld Germany

High coercivity magnets are an important resource for renewable energy, electric vehicles, and memory technologies. Most hard magnetic materials incorporate rare earths such as neodymium and samarium, but concerns about the environmental impact and supply stability of these materials are prompting research into alternatives. Here, we present a hybrid bilayer of cobalt and the nanocarbon molecule C60 which exhibits significantly enhanced coercivity with minimal reduction in magnetization. We demonstrate how this anisotropy enhancing effect cannot be described by existing models of molecule-metal magnetic interfaces. We outline a form of anisotropy, arising from asymmetric magnetoelectric coupling in the metal-molecule interface. Because this phenomenon arises from π−d hybrid orbitals, we propose calling this effect π-anisotropy. While the critical temperature of this effect is currently limited by the rotational degree of freedom of the chosen molecule, C60, we describe how surface functionalization would allow for the design of room-temperature, carbon-based hard magnetic films.

关键词： Anisotropic magnetoresistance Exchange bias Magnetic anisotropy Magnetism Bilayer films Fullerenes Interfaces Density functional calculations Magnetization measurements Micromagnetic modeling

来源：评论

学校读者我要写书评

暂无评论

Fully Conjugated Benzobisoxazole-Bridged Covalent Organic Frameworks for Boosting Photocatalytic Hydrogen Evolution

引用

Angewandte Chemie 2025年

作者： Dr. Si Ma Dr. Zhongping Li Yuxin Hou Jiali Li Zhenwei Zhang Prof. Dr. Tianqi Deng Prof. Dr. Gang Wu Prof. Dr. Rui Wang Prof. Dr. Shuo-wang Yang Prof. Dr. Xiaoming Liu College of Chemistry Jilin University Changchun 130012 P.R. China Department of Chemical and Biomolecular Engineering Yonsei University Seoul 03722 Republic of Korea State Key Laboratory of Silicon and Advanced Semiconductor Materials & School of Materials Science and Engineering Zhejiang University Hangzhou 310027 P.R. China Institute of Advanced Semiconductors & Zhejiang Provincial Key Laboratory of Power Semiconductor Materials and Devices ZJU-Hangzhou Global Scientific and Technological Innovation Center Zhejiang University Hangzhou 311215 P.R. China Institute of High Performance Computing Agency for Science Technology and Research 1 Fusionopolis Way #16-16 Connexis Singapore 138632 Singapore Key Laboratory of Aerospace Information Materials and Physics (NUAA) College of Physics Nanjing University of Aeronautics and Astronautics Nanjing 211106 P.R. China

2D covalent organic frameworks (2D-COFs) have attracted extensive interest in solar energy to hydrogen conversion. However, insufficient light harvesting and difficult exciton dissociation severely limit the improvement of photocatalytic activity for COFs, thereby impeding the progression of this advanced field. In this work, two benzobisoxazole-bridged and fully conjugated 2D-COFs with triazine (COF-JLU44) and pyrene (COF-JLU45) units were constructed for the first time via Knoevenagel polycondensation, and they hold long-range ordered structures, largely acceptable surface area, and fascinating photoelectric properties. Significantly, COF-JLU45 exhibits an impressive hydrogen evolution rate of 272.5 mmol g −1 h −1 and superior reusability in the presence of 1.0 wt% Pt under light irradiation, coupled with a remarkable apparent quantum yield of 12.9% at a long wavelength of 600 nm. Multiple spectroscopy and theoretical simulation demonstrate the ingenious design of COF-JLU45 widen its light absorption and effectively promote the exciton dissociation. This finding contributes valuable insights for constructing metal-free photocatalysts for solar energy conversion and utilization.

关键词： Benzobisoxazole Covalent organic frameworks Hydrogen evolution Photocatalysis sp2 Carbon linkage

来源：评论

学校读者我要写书评

暂无评论

Cloud shape of a molecular Bose-Einstein condensate in a disordered trap: A case study of the dirty boson problem

arXiv

引用

arXiv 2019年

作者： Nagler, Benjamin Radonjić, Milan Barbosa, Sian Koch, Jennifer Pelster, Axel Widera, Artur Department of Physics and Research Center OPTIMAS Technische Universität Kaiserslautern Kaiserslautern67663 Germany Graduate School Materials Science in Mainz Gottlieb-Daimler-Straße 47 Kaiserslautern67663 Germany Scientific Computing Laboratory Center for the Study of Complex Systems Institute of Physics Belgrade University of Belgrade Serbia

We investigate, both experimentally and theoretically, the static geometric properties of a harmonically trapped Bose-Einstein condensate of 6Li2 molecules in laser speckle potentials. Experimentally, we measure the in-situ column density profiles and the corresponding transverse cloud widths over many laser speckle realizations. We compare the measured widths with a theory that is non-perturbative with respect to the disorder and includes quantum fluctuations. Importantly, for small disorder strengths we find quantitative agreement with the perturbative approach of Huang and Meng, which is based on Bogoliubov theory. For strong disorder our theory perfectly reproduces the geometric mean of the measured transverse widths. However, we also observe a systematic deviation of the individual measured widths from the theoretically predicted ones. In fact, the measured cloud aspect ratio monotonously decreases with increasing disorder strength, while the theory yields a constant ratio. We attribute this discrepancy to the utilized local density approximation, whose failure for strong disorder suggests a potential future improvement. Copyright © 2019, The Authors. All rights reserved.

关键词： Speckle

来源：评论

学校读者我要写书评

暂无评论

Surrogate models for precessing binary black hole simulations with unequal masses

引用

Physical Review research 2019年第3期1卷 033015-033015页

作者： Vijay Varma Scott E. Field Mark A. Scheel Jonathan Blackman Davide Gerosa Leo C. Stein Lawrence E. Kidder Harald P. Pfeiffer TAPIR 350-17 California Institute of Technology 1200 East California Boulevard Pasadena California 91125 USA Department of Mathematics Center for Scientific Computing and Visualization Research University of Massachusetts Dartmouth Massachusetts 02747 USA School of Physics and Astronomy and Institute for Gravitational Wave Astronomy University of Birmingham Birmingham B15 2TT United Kingdom Department of Physics and Astronomy University of Mississippi University Mississippi 38677 USA Center for Radiophysics and Space Research Cornell University Ithaca New York 14853 USA Max Planck Institute for Gravitational Physics (Albert Einstein Institute) Am Mühlenberg 1 Potsdam 14476 Germany

Only numerical relativity simulations can capture the full complexities of binary black hole mergers. These simulations, however, are prohibitively expensive for direct data analysis applications such as parameter estimation. We present two fast and accurate surrogate models for the outputs of these simulations: the first model, NRSur7dq4, predicts the gravitational waveform and the second model, NRSur7dq4Remnant, predicts the properties of the remnant black hole. These models extend previous seven-dimensional, noneccentric precessing models to higher mass ratios and have been trained against 1528 simulations with mass ratios q≤4 and spin magnitudes χ1,χ2≤0.8, with generic spin directions. The waveform model, NRSur7dq4, which begins about 20 orbits before merger, includes all ℓ≤4 spin-weighted spherical harmonic modes, as well as the precession frame dynamics and spin evolution of the black holes. The final black hole model, NRSur7dq4Remnant, models the mass, spin, and recoil kick velocity of the remnant black hole. In their training parameter range, both models are shown to be more accurate than existing models by at least an order of magnitude, with errors comparable to the estimated errors in the numerical relativity simulations. We also show that the surrogate models work well even when extrapolated outside their training parameter space range, up to mass ratios q=6.

关键词： Gravitational waves

来源：评论

学校读者我要写书评

暂无评论

Multiparticle quantum walk with a gaslike interaction

引用

Physical Review A 2019年第4期100卷 042320-042320页

作者： Pedro C. S. Costa Fernando de Melo Renato Portugal Department of Physics and Astronomy Macquarie University Sydney New South Wales 2109 Australia Brazilian Center for Research in Physics (CBPF) Rua Dr. Xavier Sigaud 150 Rio de Janeiro RJ 22290-180 Brazil National Laboratory of Scientific Computing (LNCC) Av. Getúlio Vargas 333 Petrópolis RJ 25680-320 Brazil

We analyze the dynamics of multiparticle discrete-time quantum walk on the two-dimensional lattice, with an interaction inspired on a classical model for gas collision, called the HPP model. In this classical model, the direction of motion changes only when the particles collide head-on, preserving momentum and energy. In our quantum model, the dynamics is driven by the usual quantum-walk evolution operator if the particles are on different nodes, and is driven by the HPP rules if the particles are in the same node, linearly extended for superpositions. Using this form of evolution operator, we numerically analyze three physical quantities for the two-walker case: The probability distribution of the position of one walker, the standard deviation of the position of one walker, and the entanglement between the walkers as a function of the number of steps. The numerical analysis implies that the entanglement between the walkers as a function of the number of steps initially increases and quickly tends to a constant value, which depends on the initial condition. We compare the results obtained using the HPP interaction with the equivalent ones using the phase interaction, which is based on an evolution operator that inverts the sign of the coin operator if the walkers are in the same position.

关键词： Quantum algorithms Quantum simulation Quantum walks

来源：评论

学校读者我要写书评

暂无评论

Erratum: “The NANOGrav 15 yr Data Set: Search for Signals from New physics” (2023, ApJL 951 L11)

引用

Astrophysical Journal. Letters 2024年第1期971卷 L27页

作者： Afzal, Adeela Agazie, Gabriella Anumarlapudi, Akash Freedman, Gabriel E Islo, Kristina Jones, Megan L Kaplan, David L McEwen, Alexander Sardesai, Shashwat C Susobhanan, Abhimanyu Vigeland, Sarah J Archibald, Anne M Arzoumanian, Zaven Baker, Paul T Bécsy, Bence Burnette, Rand Case, Robin DeGan, Dallas Deng, Heling Hazboun, Jeffrey S Laal, Nima Sun, Jerry P Taylor, Jacob Jose Juan Blanco-Pillado Blecha, Laura Boddy, Kimberly K Nay, Jonathan Brazier, Adam Brook, Paul R Burke-Spolaor, Sarah Cheeseboro, Belinda D Fiore, William Fonseca, Emmanuel Garver-Daniels, Nate Gentile, Peter A Glaser, Joseph Jennings, Ross J Kaiser, Andrew R Liu, Tingting Lorimer, Duncan R McLaughlin, Maura A Turner, Jacob E Wahl, Haley M Charisi, Maria Gersbach, Kyle A Lamb, William G McMann, Natasha Petrov, Polina Pol, Nihan S Schult, Levi Taylor, Stephen R Wang, Qiaohong Chatterjee, Shami Cordes, James M Cromartie, H Thankful Stella Koch Ocker Chatziioannou, Katerina Hourihane, Sophie Lee, Vincent S H Meyers, Patrick M Chen, Siyuan Cohen, Tyler Cornish, Neil J Crawford, Fronefield Crowter, Kathryn Stairs, Ingrid H Cutler, Curt J Vallisneri, Michele DeCesar, Megan E Demorest, Paul B Stovall, Kevin Dolch, Timothy Drachler, Brendan Lam, Michael T Young, Olivia Richard von Eckardstein Schmitz, Kai Schröder, Tobias Stratmann, Peter Ferrara, Elizabeth C Good, Deborah C Guertin, Lydia Gültekin, Kayhan Johnson, Aaron D Kelley, Luke Zoltan Kerr, Matthew Ray, Paul S Key, Joey S Lazio, T Joseph W Lewandowska, Natalia Rafael R Lino dos Santos Littenberg, Tyson B Luo, Jing Lynch, Ryan S Chung-Pei, Ma Madison, Dustin R McKee, James W Meyers, Bradley W Mingarelli, Chiara M F Mitridate, Andrea Natarajan, Priyamvada Ng, Cherry Nice, David J Swiggum, Joseph K Olum, Ken D Pennucci, Timothy T Perera, Benetge B P Radovan, Henri A Ransom, Scott M Romano, Joseph D Schmiedekamp, Ann Schmiedekamp, Carl Shapiro-Albert, Brent J Siemens, Xavier Simon, Joseph Siwek, Magdalena S Stinebring, Daniel R Tanner Trickle Unal, Caner Verma, Sonali Witt, Caitlin A Wright, David Zu Institute for Theoretical Physics University of Münster D-48149 Münster Germany comments@*** Department of Physics Quaid-i-Azam University Islamabad 45320 Pakistan Center for Gravitation Cosmology and Astrophysics Department of Physics University of Wisconsin-Milwaukee P.O. Box 413 Milwaukee WI 53201 USA Newcastle University NE1 7RU UK X-Ray Astrophysics Laboratory NASA Goddard Space Flight Center Code 662 Greenbelt MD 20771 USA Department of Physics and Astronomy Widener University One University Place Chester PA 19013 USA Department of Physics Oregon State University Corvallis OR 97331 USA Department of Physics University of Basque Country UPV/EHU E-48080 Bilbao Spain EHU Quantum Center University of Basque Country UPV/EHU Bilbao Spain IKERBASQUE Basque Foundation for Science E-48011 Bilbao Spain Physics Department University of Florida Gainesville FL 32611 USA Department of Physics The University of Texas at Austin Austin TX 78712 USA Cornell Center for Astrophysics and Planetary Science and Department of Astronomy Cornell University Ithaca NY 14853 USA Cornell Center for Advanced Computing Cornell University Ithaca NY 14853 USA Institute for Gravitational Wave Astronomy and School of Physics and Astronomy University of Birmingham Edgbaston Birmingham B15 2TT UK Department of Physics and Astronomy West Virginia University P.O. Box 6315 Morgantown WV 26506 USA Center for Gravitational Waves and Cosmology West Virginia University Chestnut Ridge Research Building Morgantown WV 26505 USA Department of Physics and Astronomy Vanderbilt University 2301 Vanderbilt Place Nashville TN 37235 USA Cornell Center for Astrophysics and Planetary Science and Department of Astronomy Cornell University Ithaca NY 14853 USA Division of Physics Mathematics and Astronomy California Institute of Technology Pasadena CA 91125 USA Kavli Institute for Astronomy and Astrophysics Peking University Beijing 100871 People's Republi

来源：评论

学校读者我要写书评

暂无评论

The NANOGrav 15 yr Data Set: Looking for Signs of Discreteness in the Gravitational-wave Background

引用

The Astrophysical Journal 2024年第1期978卷 31-31页

作者： Gabriella Agazie Akash Anumarlapudi Anne M. Archibald Zaven Arzoumanian Jeremy George Baier Paul T. Baker Bence Bécsy Laura Blecha Adam Brazier Paul R. Brook Lucas Brown Sarah Burke-Spolaor J. Andrew Casey-Clyde Maria Charisi Shami Chatterjee Tyler Cohen James M. Cordes Neil J. Cornish Fronefield Crawford H. Thankful Cromartie Kathryn Crowter Megan E. DeCesar Paul B. Demorest Heling Deng Timothy Dolch Elizabeth C. Ferrara William Fiore Emmanuel Fonseca Gabriel E. Freedman Nate Garver-Daniels Peter A. Gentile Joseph Glaser Deborah C. Good Kayhan Gültekin Jeffrey S. Hazboun Ross J. Jennings Aaron D. Johnson Megan L. Jones Andrew R. Kaiser David L. Kaplan Luke Zoltan Kelley Matthew Kerr Joey S. Key Nima Laal Michael T. Lam William G. Lamb Bjorn Larsen T. Joseph W. Lazio Natalia Lewandowska Tingting Liu Duncan R. Lorimer Jing Luo Ryan S. Lynch Chung-Pei Ma Dustin R. Madison Alexander McEwen James W. McKee Maura A. McLaughlin Natasha McMann Bradley W. Meyers Patrick M. Meyers Chiara M. F. Mingarelli Andrea Mitridate Priyamvada Natarajan Cherry Ng David J. Nice Stella Koch Ocker Ken D. Olum Timothy T. Pennucci Benetge B. P. Perera Nihan S. Pol Henri A. Radovan Scott M. Ransom Paul S. Ray Joseph D. Romano Jessie C. Runnoe Shashwat C. Sardesai Ann Schmiedekamp Carl Schmiedekamp Kai Schmitz Brent Shapiro-Albert Xavier Siemens Joseph Simon Magdalena S. Siwek Sophia V. Sosa Fiscella Ingrid H. Stairs Daniel R. Stinebring Kevin Stovall Abhimanyu Susobhanan Joseph K. Swiggum Stephen R. Taylor Jacob E. Turner Caner Unal Michele Vallisneri Sarah J. Vigeland Haley M. Wahl London Willson Caitlin A. Witt David Wright Olivia Young Center for Gravitation Cosmology and Astrophysics Department of Physics University of Wisconsin-milwaukee P.O. Box 413 Milwaukee WI 53201 USA Newcastle University NE1 7RU UK X-Ray Astrophysics Laboratory NASA Goddard Space Flight Center Code 662 Greenbelt MD 20771 USA Department of Physics Oregon State University Corvallis OR 97331 USA Department of Physics and Astronomy Widener University One University Place Chester PA 19013 USA Physics Department University of Florida Gainesville FL 32611 USA Cornell Center for Astrophysics and Planetary Science and Department of Astronomy Cornell University Ithaca NY 14853 USA Cornell Center for Advanced Computing Cornell University Ithaca NY 14853 USA Institute for Gravitational Wave Astronomy and School of Physics and Astronomy University of Birmingham Edgbaston Birmingham B15 2TT UK Institute of Cosmology Department of Physics and Astronomy Tufts University Medford MA 02155 USA Department of Physics and Astronomy West Virginia University P.O. Box 6315 Morgantown WV 26506 USA Center for Gravitational Waves and Cosmology West Virginia University Chestnut Ridge Research Building Morgantown WV 26505 USA Department of Physics University of Connecticut 196 Auditorium Road U-3046 Storrs CT 06269-3046 USA andrew.casey-clyde@uconn.edu Department of Physics and Astronomy Vanderbilt University 2301 Vanderbilt Place Nashville TN 37235 USA Department of Physics New Mexico Institute of Mining and Technology 801 Leroy Place Socorro NM 87801 USA Department of Physics Montana State University Bozeman MT 59717 USA Department of Physics and Astronomy Franklin & Marshall College P.O. Box 3003 Lancaster PA 17604 USA National Research Council Research Associate National Academy of Sciences Washington DC 20001 USA resident at Naval Research Laboratory Washington DC 20375 USA Department of Physics and Astronomy University of British Columbia 6224 Agricultural Road Vancouver BC V6T 1Z1 Canada George Mason Un

The cosmic merger history of supermassive black hole binaries (SMBHBs) is expected to produce a low-frequency gravitational wave background (GWB). Here we investigate how signs of the discrete nature of this GWB can manifest in pulsar timing arrays through excursions from, and breaks in, the expected $f_{\mathrm{GW}}^{-2/3}$ power-law of the GWB strain spectrum. To do this, we create a semi-analytic SMBHB population model, fit to NANOGrav's 15 yr GWB amplitude, and with 1,000 realizations we study the populations' characteristic strain and residual spectra. Comparing our models to the NANOGrav 15 yr spectrum, we find two interesting excursions from the power-law. The first, at $2 \; \mathrm{nHz}$, is below our GWB realizations with $p$-value significance $p = 0.05$ to $0.06$ ($\approx 1.8 \sigma - 1.9 \sigma$). The second, at $16 \; \mathrm{nHz}$, is above our GWB realizations with $p = 0.04$ to $0.15$ ($\approx 1.4 \sigma - 2.1 \sigma$). We explore the properties of a loud SMBHB which could cause such an excursion. Our simulations also show that the expected number of SMBHBs decreases by three orders of magnitude, from $\sim 10^6$ to $\sim 10^3$, between $2\; \mathrm{nHz}$ and $20 \; \mathrm{nHz}$. This causes a break in the strain spectrum as the stochasticity of the background breaks down at $26^{+28}_{-19} \; \mathrm{nHz}$, consistent with predictions pre-dating GWB measurements. The diminished GWB signal from SMBHBs at frequencies above the $26~\mathrm{nHz}$ break opens a window for PTAs to detect continuous GWs from individual SMBHBs or GWs from the early universe.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Constraining Cosmological Phase Transitions with the Parkes Pulsar Timing Array

引用

Physical Review Letters 2021年第25期127卷 251303-251303页

作者： Xiao Xue Ligong Bian Jing Shu Qiang Yuan Xingjiang Zhu N. D. Ramesh Bhat Shi Dai Yi Feng Boris Goncharov George Hobbs Eric Howard Richard N. Manchester Christopher J. Russell Daniel J. Reardon Ryan M. Shannon Renée Spiewak Nithyanandan Thyagarajan Jingbo Wang CAS Key Laboratory of Theoretical Physics Institute of Theoretical Physics Chinese Academy of Sciences Beijing 100190 China School of Physical Sciences University of Chinese Academy of Sciences Beijing 100049 China II. Institute of Theoretical Physics Universität Hamburg 22761 Hamburg Germany Department of Physics Chongqing University Chongqing 401331 China Chongqing Key Laboratory for Strongly Coupled Physics Chongqing 401331 China School of Fundamental Physics and Mathematical Sciences Hangzhou Institute for Advanced Study University of Chinese Academy of Sciences Hangzhou 310024 China Center for High Energy Physics Peking University Beijing 100871 China International Center for Theoretical Physics Asia-Pacific Beijing/Hanzhou China Key Laboratory of Dark Matter and Space Astronomy Purple Mountain Observatory Chinese Academy of Sciences Nanjing 210023 China School of Astronomy and Space Science University of Science and Technology of China Hefei 230026 China School of Physics and Astronomy Monash University Clayton VIC 3800 Australia OzGrav: The ARC Centre of Excellence for Gravitational Wave Discovery Hawthorn VIC 3122 Australia Advanced Institute of Natural Sciences Beijing Normal University at Zhuhai 519087 China International Centre for Radio Astronomy Research Curtin University Bentley WA 6102 Australia Western Sydney University Locked Bag 1797 Penrith South DC NSW 1797 Australia University of Chinese Academy of Sciences Beijing 100049 China CSIRO Astronomy and Space Science P.O. Box 76 Epping NSW 1710 Australia Macquarie University Department of Physics and Astronomy Sydney NSW 2109 Australia CSIRO Scientific Computing Australian Technology Park Locked Bag 9013 Alexandria NSW 1435 Australia Centre for Astrophysics and Supercomputing Swinburne University of Technology P.O. Box 218 Hawthorn VIC 3122 Australia Jodrell Bank Centre for Astrophysics University of Manchester Manchester M13 9PL United Kingdom CSIRO Astronomy and Space Science

A cosmological first-order phase transition is expected to produce a stochastic gravitational wave background. If the phase transition temperature is on the MeV scale, the power spectrum of the induced stochastic gravitational waves peaks around nanohertz frequencies, and can thus be probed with high-precision pulsar timing observations. We search for such a stochastic gravitational wave background with the latest data set of the Parkes Pulsar Timing Array. We find no evidence for a Hellings-Downs spatial correlation as expected for a stochastic gravitational wave background. Therefore, we present constraints on first-order phase transition model parameters. Our analysis shows that pulsar timing is particularly sensitive to the low-temperature (T∼1–100 MeV) phase transition with a duration (β/H*)−1∼10−2−10−1 and therefore can be used to constrain the dark and QCD phase transitions.

关键词： First order phase transitions Gravitational wave detection

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：