Pub Date : 2024-04-09DOI: 10.1088/1674-1137/ad3c2c
Husan Alibekov, Farruh Atamurotov, A. Abdujabbarov, Vokhid Khamidov
In this paper, we have investigated the mathematical components of the Dirac equation in curved space-time and how it can be applied to the analysis of neutrino oscillations. More specifically, we have developed a method for calculating the phase shift in flavor neutrino oscillations by utilizing a Taylor series expansion of the action, taking into account $Delta m^4$ orders. In addition, we have used this method to assess how the phase difference in neutrino mass eigenstates changes due to the gravitational field described by the Johannsen spacetime.
{"title":"Neutrino oscillations in the Non-Kerr black hole with quantum phenomenon","authors":"Husan Alibekov, Farruh Atamurotov, A. Abdujabbarov, Vokhid Khamidov","doi":"10.1088/1674-1137/ad3c2c","DOIUrl":"https://doi.org/10.1088/1674-1137/ad3c2c","url":null,"abstract":"\u0000 In this paper, we have investigated the mathematical components of the Dirac equation in curved space-time and how it can be applied to the analysis of neutrino oscillations. More specifically, we have developed a method for calculating the phase shift in flavor neutrino oscillations by utilizing a Taylor series expansion of the action, taking into account $Delta m^4$ orders. In addition, we have used this method to assess how the phase difference in neutrino mass eigenstates changes due to the gravitational field described by the Johannsen spacetime.","PeriodicalId":504778,"journal":{"name":"Chinese Physics C","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140725255","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}
ccurate and reliable nuclear decay database is essential for fundamental and applied nuclear relative researches. However, the decay data is not as accurate as usual impression and still need improvement. Hence, the new Chinese nuclear decay database in fission product mass region (A=66-172) has been developed under the joint efforts of CNDC working group, based on several major national evaluated data libraries. Totally 2358 nuclides have been included in this decay database. Two main data formats, ENSDF and ENDF, are adopted. For the total mean and energies, data from total absorption gamma ray spectroscopy measurement are adopted when available. For some nuclides without experimental measurements, theoretically calculated values were added.
{"title":"The nuclear decay database in fission product mass region","authors":"Xiaolong Huang, Dong Yang, Zhigang Ge, Xianghan Wang, Yangyang Liu, Yongli Jin, Jian Li","doi":"10.1088/1674-1137/ad3b9d","DOIUrl":"https://doi.org/10.1088/1674-1137/ad3b9d","url":null,"abstract":"\u0000 ccurate and reliable nuclear decay database is essential for fundamental and applied nuclear relative researches. However, the decay data is not as accurate as usual impression and still need improvement. Hence, the new Chinese nuclear decay database in fission product mass region (A=66-172) has been developed under the joint efforts of CNDC working group, based on several major national evaluated data libraries. Totally 2358 nuclides have been included in this decay database. Two main data formats, ENSDF and ENDF, are adopted. For the total mean and energies, data from total absorption gamma ray spectroscopy measurement are adopted when available. For some nuclides without experimental measurements, theoretically calculated values were added.","PeriodicalId":504778,"journal":{"name":"Chinese Physics C","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140728278","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}
Pub Date : 2024-04-03DOI: 10.1088/1674-1137/ad39cd
Gang Yang, Jia-Lun 平加伦 Ping, Jorge Segovia
The $S$-wave $bar{q}qbar{s}Q$ $(q=u,,d;,Q=c,,b)$ tetraquarks, with spin-parity $J^P=0^+$, $1^+$ and $2^+$, in both isoscalar and isovector sectors are systematically studied in a chiral quark model. The meson-meson, diquark-antidiquark and K-type arrangements of quarks, along with all possible color wave functions, are comprehensively considered. The four-body system is solved by means of a highly efficient computational approach, the Gaussian expansion method, along with a complex-scaling formulation of the problem to disentangle bound, resonance and scattering states. This theoretical framework has already been successfully applied in various tetra- and penta-quark systems. In the complete coupled-channel case, and within the complex-range formulation, several narrow resonances of $bar{q}qbar{s}c$ and $bar{q}qbar{s}b$ systems are obtained, in each allowed $I(J^P)$-channels, within the energy regions $2.4-3.4$ GeV and $5.7-6.7$ GeV, respectively. The predicted exotic states, which are an indication of a richer color structure when going towards multiquark systems beyond mesons and baryons, are expected to be confirmed in future high-energy particle and nuclear experiments.Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Article funded by SCOAP3 and published under licence by Chinese Physical Society and the Institute of High Energy Physics of the Chinese Academy of Science and the Institute of Modern Physics of the Chinese Academy of Sciences and IOP Publishing Ltd.
{"title":"The $mathbf{bar{q}qbar{s}Q}$ $mathbf{(q=u,,d;,Q=c,,b)}$ tetraquark system in a chiral quark model","authors":"Gang Yang, Jia-Lun 平加伦 Ping, Jorge Segovia","doi":"10.1088/1674-1137/ad39cd","DOIUrl":"https://doi.org/10.1088/1674-1137/ad39cd","url":null,"abstract":"\u0000 The $S$-wave $bar{q}qbar{s}Q$ $(q=u,,d;,Q=c,,b)$ tetraquarks, with spin-parity $J^P=0^+$, $1^+$ and $2^+$, in both isoscalar and isovector sectors are systematically studied in a chiral quark model. The meson-meson, diquark-antidiquark and K-type arrangements of quarks, along with all possible color wave functions, are comprehensively considered. The four-body system is solved by means of a highly efficient computational approach, the Gaussian expansion method, along with a complex-scaling formulation of the problem to disentangle bound, resonance and scattering states. This theoretical framework has already been successfully applied in various tetra- and penta-quark systems. In the complete coupled-channel case, and within the complex-range formulation, several narrow resonances of $bar{q}qbar{s}c$ and $bar{q}qbar{s}b$ systems are obtained, in each allowed $I(J^P)$-channels, within the energy regions $2.4-3.4$ GeV and $5.7-6.7$ GeV, respectively. The predicted exotic states, which are an indication of a richer color structure when going towards multiquark systems beyond mesons and baryons, are expected to be confirmed in future high-energy particle and nuclear experiments.Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Article funded by SCOAP3 and published under licence by Chinese Physical Society and the Institute of High Energy Physics of the Chinese Academy of Science and the Institute of Modern Physics of the Chinese Academy of Sciences and IOP Publishing Ltd.","PeriodicalId":504778,"journal":{"name":"Chinese Physics C","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140748520","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}
Pub Date : 2024-04-01DOI: 10.1088/1674-1137/ad3942
Guixiang Chen, Xin Li
Fast radio bursts (FRBs) are useful cosmological probes with numerous applications in cosmology. The distribution of the dispersion measure contribution from the intergalactic medium is a key issue. A quasi-Gaussian distribution has been used to replace the traditional Gaussian distribution, which yields promising results. However, our work suggests that there may be additional challenges in its application. Here we use 35 well-localized FRBs to constrain the Hubble constant H0 along with two FRB-related parameters, yielding H0 =60.99+4.57 −4.90 km s-1 Mpc-1. The best-fitting Hubble constant H0 is smaller than the value obtained from the Cosmic Microwave Background (CMB), which may be caused by the small sample size of current FRB data. Monte Carlo simulations indicate that a set of 100 simulated FRBs provides a more precise fitting result for the Hubble constant. But the precision of the Hubble constant does not improve when further enlarging the FRB sample. Further simulations reveal a systematic deviation in the fitting results of H0, attributed to the quasi-Gaussian distribution of dispersion measure in the intergalactic medium. Despite this, the results remain reliable within the 1σ uncertainty, assuming a sufficient number of FRB data are available.
{"title":"The quasi-Gaussian distribution of DMIGM in fast radio bursts may bias the constraints on the Hubble constant","authors":"Guixiang Chen, Xin Li","doi":"10.1088/1674-1137/ad3942","DOIUrl":"https://doi.org/10.1088/1674-1137/ad3942","url":null,"abstract":"\u0000 Fast radio bursts (FRBs) are useful cosmological probes with numerous applications in cosmology. The distribution of the dispersion measure contribution from the intergalactic medium is a key issue. A quasi-Gaussian distribution has been used to replace the traditional Gaussian distribution, which yields promising results. However, our work suggests that there may be additional challenges in its application. Here we use 35 well-localized FRBs to constrain the Hubble constant H0 along with two FRB-related parameters, yielding H0 =60.99+4.57\u0000 −4.90 km s-1 Mpc-1. The best-fitting Hubble constant H0 is smaller than the value obtained from the Cosmic Microwave Background (CMB), which may be caused by the small sample size of current FRB data. Monte Carlo simulations indicate that a set of 100 simulated FRBs provides a more precise fitting result for the Hubble constant. But the precision of the Hubble constant does not improve when further enlarging the FRB sample. Further simulations reveal a systematic deviation in the fitting results of H0, attributed to the quasi-Gaussian distribution of dispersion measure in the intergalactic medium. Despite this, the results remain reliable within the 1σ uncertainty, assuming a sufficient number of FRB data are available.","PeriodicalId":504778,"journal":{"name":"Chinese Physics C","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140785380","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}
Pub Date : 2024-03-27DOI: 10.1088/1674-1137/ad380f
Qing Lin, Jiafu Li
Signal reconstruction through software processing is a crucial component of the background and signal models in the PandaX-4T experiment, which is a multi-tonne dark matter direct search experiment. The accuracy of signal reconstruction is influenced by various detector artifacts, including noise, dark count of photomultiplier, photoionization of impurities in the detector, and other relevant considerations. In this study, we present a detailed description of a semi-data-driven approach designed to simulate the signal waveform. This work provides a reliable model for the efficiency and bias of the signal reconstruction in the data analysis of PandaX-4T. By comparing critical variables which relate to the temporal shape and hit pattern of the signals, we demonstrate a good agreement between the simulation and data. Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Article funded by SCOAP3 and published under licence by Chinese Physical Society and the Institute of High Energy Physics of the Chinese Academy of Science and the Institute of Modern Physics of the Chinese Academy of Sciences and IOP Publishing Ltd.
{"title":"Waveform Simulation in PandaX-4T","authors":"Qing Lin, Jiafu Li","doi":"10.1088/1674-1137/ad380f","DOIUrl":"https://doi.org/10.1088/1674-1137/ad380f","url":null,"abstract":"\u0000 Signal reconstruction through software processing is a crucial component of the background and signal models in the PandaX-4T experiment, which is a multi-tonne dark matter direct search experiment. The accuracy of signal reconstruction is influenced by various detector artifacts, including noise, dark count of photomultiplier, photoionization of impurities in the detector, and other relevant considerations. In this study, we present a detailed description of a semi-data-driven approach designed to simulate the signal waveform. This work provides a reliable model for the efficiency and bias of the signal reconstruction in the data analysis of PandaX-4T. By comparing critical variables which relate to the temporal shape and hit pattern of the signals, we demonstrate a good agreement between the simulation and data. Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Article funded by SCOAP3 and published under licence by Chinese Physical Society and the Institute of High Energy Physics of the Chinese Academy of Science and the Institute of Modern Physics of the Chinese Academy of Sciences and IOP Publishing Ltd.","PeriodicalId":504778,"journal":{"name":"Chinese Physics C","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140374880","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}
Pub Date : 2024-03-27DOI: 10.1088/1674-1137/ad3814
Dawei Guan, Junchen Pei, Chongji Jiang
The recent measurements on neutron skins via parity violation in electron scattering have extracted an abnormal thick neutron skin for $^{208}$Pb, which has significant consequences in nuclear equation of state (EoS) and neutron star observations. This work performs optimizations of extended Skyrme forces in a consistent manner by including neutron skin thicknesses from PREX-II and CREX experiments and investigates nuclear EoS and neutron stars in the GW170817 event. By varying the fitting weights of neutron skins, several new Skyrme parameterizations are obtained. Our results show the competition in the fitting procedure to simultaneously describe neutron skins, other properties of finite nuclei and neutron star observations. The prospects in resolving the neutron skin issues are also discussed.
{"title":"Implications on Skyrme equations of state from neutron skin measurements","authors":"Dawei Guan, Junchen Pei, Chongji Jiang","doi":"10.1088/1674-1137/ad3814","DOIUrl":"https://doi.org/10.1088/1674-1137/ad3814","url":null,"abstract":"\u0000 The recent measurements on neutron skins via parity violation in electron scattering have extracted an abnormal thick neutron skin for $^{208}$Pb, which has significant consequences in nuclear equation of state (EoS) and neutron star observations. This work performs optimizations of extended Skyrme forces in a consistent manner by including neutron skin thicknesses from PREX-II and CREX experiments and investigates nuclear EoS and neutron stars in the GW170817 event. By varying the fitting weights of neutron skins, several new Skyrme parameterizations are obtained. Our results show the competition in the fitting procedure to simultaneously describe neutron skins, other properties of finite nuclei and neutron star observations. The prospects in resolving the neutron skin issues are also discussed.","PeriodicalId":504778,"journal":{"name":"Chinese Physics C","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140375738","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}
Pub Date : 2024-02-28DOI: 10.1088/1674-1137/ad2dc3
Indrani Ray, Argha Deb
TALYS calculations have been performed to obtain the theoretical proton capture cross-sections on the p-nuclei. A short review has been done on the status of the experimental studies of the same. Some basic properties like the Q-values, Coulomb barrier, Gamow peak, Gamow Window, decay properties of the parent and daughter nuclei have been compiled. The various experimental parameters namely, beam energy, beam current, targets, detectors etc. used in the various experimental investigations reported in the literature have been tabulated. TALYS calculations results in the Gamow region have been compared with the corresponding experimental values wherever available. This work is expected to facilitate the planning of the future experiments.
通过 TALYS 计算获得了 p 核的质子俘获理论截面。我们还对这方面的实验研究现状进行了简短回顾。一些基本特性，如 Q 值、库仑障碍、伽莫峰、伽莫窗口、母核和子核的衰变特性等，都已汇编成册。文献中报道的各种实验研究中使用的各种实验参数，即束流能量、束流电流、目标、探测器等，都已制成表格。TALYS 在伽莫区的计算结果与相应的实验值进行了比较。这项工作有望促进未来实验的规划。
{"title":"TALYS calculation and a short review of the experimental status of proton capture studies on p-nuclei: A guide to future investigation.","authors":"Indrani Ray, Argha Deb","doi":"10.1088/1674-1137/ad2dc3","DOIUrl":"https://doi.org/10.1088/1674-1137/ad2dc3","url":null,"abstract":"\u0000 TALYS calculations have been performed to obtain the theoretical proton capture cross-sections on the p-nuclei. A short review has been done on the status of the experimental studies of the same. Some basic properties like the Q-values, Coulomb barrier, Gamow peak, Gamow Window, decay properties of the parent and daughter nuclei have been compiled. The various experimental parameters namely, beam energy, beam current, targets, detectors etc. used in the various experimental investigations reported in the literature have been tabulated. TALYS calculations results in the Gamow region have been compared with the corresponding experimental values wherever available. This work is expected to facilitate the planning of the future experiments.","PeriodicalId":504778,"journal":{"name":"Chinese Physics C","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140423343","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}
Pub Date : 2024-02-28DOI: 10.1088/1674-1137/ad2dc1
N. Sharma, Ashutosh Kaushik, Manoj K Sharma
Numerous experimental and theoretical observations conclude that the probability of the three fragment emission (ternary fission) or the binary fission increases when one proceeds towards the heavy mass region of nuclear periodic table. The collinear cluster tripartition (CCT) channel of $^{235}$U(n$^{th}$,f) reaction is studied and it was observed that the CCT may be a sequential process or a simultaneous emission phenomena. Till now, different approaches are introduced to study the CCT process as a simultaneous process or sequential process, but the decay dynamics of these modes is not fully explored. It will be of interest to identify the three fragments of the sequential process and to explore their related dynamics using some excitation energy dependent approach. Hence, in present work, an attempt is made to study the sequential decay mechanism of $^{235}$U(n$^{th}$,f) reaction using quantum mechanical fragmentation theory (QMFT). The decay mechanism is considered in two steps, where initially the nucleus splits into an asymmetric channel. In the second step, the heavy fragment obtained in the first step divides into two fragments. Stage I analysis is done by calculating the fragmentation potential and the preformation probability for the spherical and deformed choice of the decaying fragments. The most probable fragment combination of stage I are identified in view the dips in the fragmentation structure, and the corresponding maxima's of the preformation probability ($P_0$). The excitation energy of the decay channel is calculated using an iteration process. The obtained excitation energy of the identified heavy fragments is further used for the fragmentation analysis, and the subsequent binary fragments of the sequential process are obtained. The identified three fragments of the sequential process are in agreement with the experimental observation and are found nearby the neutron or proton shell closure. Finally, the kinetic energy of the observed fragments is calculated and the middle fragment of the CCT mechanism is identified.
{"title":"Sequential decay analysis of $^{235}$U(n$^{th}$,f) reaction using fragmentation approach","authors":"N. Sharma, Ashutosh Kaushik, Manoj K Sharma","doi":"10.1088/1674-1137/ad2dc1","DOIUrl":"https://doi.org/10.1088/1674-1137/ad2dc1","url":null,"abstract":"\u0000 Numerous experimental and theoretical observations conclude that the probability of the three fragment emission (ternary fission) or the binary fission increases when one proceeds towards the heavy mass region of nuclear periodic table. The collinear cluster tripartition (CCT) channel of $^{235}$U(n$^{th}$,f) reaction is studied and it was observed that the CCT may be a sequential process or a simultaneous emission phenomena. Till now, different approaches are introduced to study the CCT process as a simultaneous process or sequential process, but the decay dynamics of these modes is not fully explored. It will be of interest to identify the three fragments of the sequential process and to explore their related dynamics using some excitation energy dependent approach. Hence, in present work, an attempt is made to study the sequential decay mechanism of $^{235}$U(n$^{th}$,f) reaction using quantum mechanical fragmentation theory (QMFT). The decay mechanism is considered in two steps, where initially the nucleus splits into an asymmetric channel. In the second step, the heavy fragment obtained in the first step divides into two fragments. Stage I analysis is done by calculating the fragmentation potential and the preformation probability for the spherical and deformed choice of the decaying fragments. The most probable fragment combination of stage I are identified in view the dips in the fragmentation structure, and the corresponding maxima's of the preformation probability ($P_0$). The excitation energy of the decay channel is calculated using an iteration process. The obtained excitation energy of the identified heavy fragments is further used for the fragmentation analysis, and the subsequent binary fragments of the sequential process are obtained. The identified three fragments of the sequential process are in agreement with the experimental observation and are found nearby the neutron or proton shell closure. Finally, the kinetic energy of the observed fragments is calculated and the middle fragment of the CCT mechanism is identified.","PeriodicalId":504778,"journal":{"name":"Chinese Physics C","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140422485","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}
Pub Date : 2024-02-26DOI: 10.1088/1674-1137/ad2ce5
Hongxin Jiang, Xinyi Du, Qiyuan Pan, Songbai Chen, Jiliang Jing
We investigate the main features of the disformal Kerr black hole merger in quadratic degenerate higher-order scalar-tensor (DHOST) theories. For the ringdown stage of the black hole mergers, we find that, for the prograde orbit, the real part of the quasinormal modes (QNMs) decreases with the increase of the disformal parameter, and imaginary part decreases with it except for the Kerr case for large spin parameter. But for the retrograde orbit, the real part increases with the increase of the disformal parameter and imaginary part always decreases with it. For the approximate final spin, we observe that, regardless of the equal spin merger, unequal spin merger and generic spin configuration merger, the final black hole spin always increases with the increase of the disformal parameter. Our results show that the disformal parameter in the disformal Kerr solution and the MOG parameter in the Kerr-MOG case have obviously different effects on the black hole merger, which suggests the differences of these two spacetime structures.
{"title":"Merger estimates for a disformal Kerr black hole in quadratic degenerate higher-order scalar-tensor theories","authors":"Hongxin Jiang, Xinyi Du, Qiyuan Pan, Songbai Chen, Jiliang Jing","doi":"10.1088/1674-1137/ad2ce5","DOIUrl":"https://doi.org/10.1088/1674-1137/ad2ce5","url":null,"abstract":"\u0000 We investigate the main features of the disformal Kerr black hole merger in quadratic degenerate higher-order scalar-tensor (DHOST) theories. For the ringdown stage of the black hole mergers, we find that, for the prograde orbit, the real part of the quasinormal modes (QNMs) decreases with the increase of the disformal parameter, and imaginary part decreases with it except for the Kerr case for large spin parameter. But for the retrograde orbit, the real part increases with the increase of the disformal parameter and imaginary part always decreases with it. For the approximate final spin, we observe that, regardless of the equal spin merger, unequal spin merger and generic spin configuration merger, the final black hole spin always increases with the increase of the disformal parameter. Our results show that the disformal parameter in the disformal Kerr solution and the MOG parameter in the Kerr-MOG case have obviously different effects on the black hole merger, which suggests the differences of these two spacetime structures.","PeriodicalId":504778,"journal":{"name":"Chinese Physics C","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140431725","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}
Pub Date : 2024-02-21DOI: 10.1088/1674-1137/ad2b50
Wenchang Xiang, Dewen Cao, Dai-Cui 周代翠 Zhou
We use the refined hot spot model to study the valence quark shape of the proton with the deeply virtual Compton scattering at high energies in the framework of Color Glass Condensate. To investigate the individual valence quark shape, a novel treatment of the valence quark width is employed. We calculate the cross-sections for the coherent and incoherent deeply virtual Compton scattering, for the first time, by using different widths ($mathrm{B_u}$ and $mathrm{B_d}$) for the profile density distributions of the up and down quarks instead of using the same width as in the literature. We find that the cross-sections calculated with $mathrm{B_u geq B_d}$ at each collision energy are consistent with each other themselves, which is in agreement with the theoretical expectations. While the ones computed with $mathrm{B_u < B_d}$ show some discrepancies. This outcome implies that the up quark might emit more gluons than the down quark leading to $mathrm{B_u geq B_d}$ at high energy. The energy impact of the outcome is estimated. Our results show that as the collision energy increases, the aforementioned discrepancies are not only significantly broadened, but also shift to relatively smaller momentum transfer range in the future Electron-Ion Collider (EIC) and Large Hadron Electron Collider (LHeC) energies, which indicates that the EIC and LHeC can provide unprecedented chance to access the shape of the valence quark of the proton.
{"title":"Probing valence quark width of the proton in deeply virtual Compton scattering at high energies","authors":"Wenchang Xiang, Dewen Cao, Dai-Cui 周代翠 Zhou","doi":"10.1088/1674-1137/ad2b50","DOIUrl":"https://doi.org/10.1088/1674-1137/ad2b50","url":null,"abstract":"\u0000 We use the refined hot spot model to study the valence quark shape of the proton with the deeply virtual Compton scattering at high energies in the framework of Color Glass Condensate. To investigate the individual valence quark shape, a novel treatment of the valence quark width is employed. We calculate the cross-sections for the coherent and incoherent deeply virtual Compton scattering, for the first time, by using different widths ($mathrm{B_u}$ and $mathrm{B_d}$) for the profile density distributions of the up and down quarks instead of using the same width as in the literature. We find that the cross-sections calculated with $mathrm{B_u geq B_d}$ at each collision energy are consistent with each other themselves, which is in agreement with the theoretical expectations. While the ones computed with $mathrm{B_u < B_d}$ show some discrepancies. This outcome implies that the up quark might emit more gluons than the down quark leading to $mathrm{B_u geq B_d}$ at high energy. The energy impact of the outcome is estimated. Our results show that as the collision energy increases, the aforementioned discrepancies are not only significantly broadened, but also shift to relatively smaller momentum transfer range in the future Electron-Ion Collider (EIC) and Large Hadron Electron Collider (LHeC) energies, which indicates that the EIC and LHeC can provide unprecedented chance to access the shape of the valence quark of the proton.","PeriodicalId":504778,"journal":{"name":"Chinese Physics C","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140442491","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}
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