Progress of Theoretical and Experimental Physics最新文献_第8页

The Petz (lite) recovery map for scrambling channel 用于争夺通道的 Petz（精简版）恢复地图

IF 3.5 4区物理与天体物理

Progress of Theoretical and Experimental Physics Pub Date : 2023-12-06 DOI: 10.1093/ptep/ptad147

Yasuaki Nakayama, Akihiro Miyata, Tomonori Ugajin

{"title":"The Petz (lite) recovery map for scrambling channel","authors":"Yasuaki Nakayama, Akihiro Miyata, Tomonori Ugajin","doi":"10.1093/ptep/ptad147","DOIUrl":"https://doi.org/10.1093/ptep/ptad147","url":null,"abstract":"We study properties of the Petz recovery map in chaotic systems, such as the Hayden-Preskill setup for evaporating black holes and the SYK model. Since these systems exhibit the phenomenon called scrambling, we expect that the expression of the recovery channel $mathcal {R}$ gets simplified, given by just the adjoint $mathcal {N}^{dagger }$ of the original channel $mathcal {N}$ which defines the time evolution of the states in the code subspace embedded into the physical Hilbert space. We check this phenomenon in two examples. The first one is the Hayden-Preskill setup described by Haar random unitaries. We compute the relative entropy $S(mathcal {R}left[mathcal {N}[rho ]right] ||rho )$ and show that it vanishes when the decoupling is archived. We further show that the simplified recovery map is equivalent to the protocol proposed by Yoshida and Kitaev. The second example is the SYK model where the two-dimensional code subspace is defined by an insertion of a fermionic operator, and the system is evolved by the SYK Hamiltonian. We check the recovery phenomenon by relating some matrix elements of an output density matrix $langle {T}|{R}[mathcal {N}[rho ]]|{T^{prime }}rangle$ to Rényi-two modular flowed correlators, and show that they coincide with the elements for the input density matrix with small error after twice the scrambling time.","PeriodicalId":20710,"journal":{"name":"Progress of Theoretical and Experimental Physics","volume":"4 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2023-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138556328","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}

引用次数: 1

Global density-dependent α-nucleon interaction for α-nucleus elastic scattering α-核弹性散射的全局密度依赖性α-核子相互作用

IF 3.5 4区物理与天体物理

Progress of Theoretical and Experimental Physics Pub Date : 2023-12-06 DOI: 10.1093/ptep/ptad148

T Furumoto, K Tsubakihara, S Ebata, W Horiuchi

引用次数: 0

Topologically nontrivial three-body contact interaction in one dimension 一维拓扑非三维三体接触相互作用

IF 3.5 4区物理与天体物理

Progress of Theoretical and Experimental Physics Pub Date : 2023-12-06 DOI: 10.1093/ptep/ptad149

Satoshi Ohya

引用次数: 0

Impurity and hybridization effects on the symmetry classification and magnetic response function of a two-band superconductor with inter-band pairing order 杂化和杂化对带间配对有序双带超导体对称分类和磁响应函数的影响

IF 3.5 4区物理与天体物理

Progress of Theoretical and Experimental Physics Pub Date : 2023-12-05 DOI: 10.1093/ptep/ptad142

F Aghamohammadi Renani, H Yavari

{"title":"Impurity and hybridization effects on the symmetry classification and magnetic response function of a two-band superconductor with inter-band pairing order","authors":"F Aghamohammadi Renani, H Yavari","doi":"10.1093/ptep/ptad142","DOIUrl":"https://doi.org/10.1093/ptep/ptad142","url":null,"abstract":"The effects of hybridization and impurities (magnetic and nonmagnetic) potentials on the pairing symmetries and magnetic response of a two-band superconductor with equal-time s-wave inter-band pairing order parameter in the framework of Green's function technique are investigated theoretically. First, the effects of spin-independent and spin-dependent hybridization on the generation of even- or odd-frequency Cooper pairs which determines the symmetry classification and the response of superconductor are studied. Next, the impurity effect on creating different symmetry classes and the kernel response function of a two-band superconductor are discussed. By separating the contributions of even- and odd-frequency pairing to the Meissner kernel, it is shown that the competition between these two terms determines the total Meissner effect of the superconductor. For a two-band spin-singlet superconductor, nonmagnetic impurity scatterings do not change transition temperature according to Anderson's theorem, while both intra- and inter-band magnetic impurity scattering cause the superconducting transition temperature suppression with the rate following the Abrikosov-Gor'kov theory. For spin-triplet pairing, inter-band magnetic scattering has no impact on pair breaking, while intra-band magnetic scattering acts as a pair breaker and suppresses the transition temperature in the Born limit. In this case, the odd-frequency superconducting pairs can be induced in the simultaneous presence of both intra-and inter-band magnetic impurities. Thus by controlling the concentration of magnetic impurities, it is possible to engineer triplet-paring odd-frequency superconductors with the total diamagnetic Meissner response which stabilizes the superconducting state. This technique opens a road for designing stable odd-frequency superconductors.","PeriodicalId":20710,"journal":{"name":"Progress of Theoretical and Experimental Physics","volume":"17 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2023-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138531452","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}

引用次数: 0

High-pressure xenon gas time projection chamber with scalable design and its performance at around the Q value of 136Xe double-beta decay 采用可伸缩设计的高压氙气时间投影室及其在136Xe双β衰变Q值附近的性能

IF 3.5 4区物理与天体物理

Progress of Theoretical and Experimental Physics Pub Date : 2023-12-04 DOI: 10.1093/ptep/ptad146

Masashi Yoshida, Kazuhiro Nakamura, Shinichi Akiyama, Sei Ban, Junya Hikida, Masanori Hirose, Atsuko K Ichikawa, Yoshihisa Iwashita, Yukimasa Kashino, Tatsuya Kikawa, Akihiro Minamino, Kentaro Miuchi, Yasuhiro Nakajima, Kiseki D Nakamura, Tsuyoshi Nakaya, Shuhei Obara, Ken Sakashita, Hiroyuki Sekiya, Hibiki Shinagawa, Bungo Sugashima, Soki Urano

{"title":"High-pressure xenon gas time projection chamber with scalable design and its performance at around the Q value of 136Xe double-beta decay","authors":"Masashi Yoshida, Kazuhiro Nakamura, Shinichi Akiyama, Sei Ban, Junya Hikida, Masanori Hirose, Atsuko K Ichikawa, Yoshihisa Iwashita, Yukimasa Kashino, Tatsuya Kikawa, Akihiro Minamino, Kentaro Miuchi, Yasuhiro Nakajima, Kiseki D Nakamura, Tsuyoshi Nakaya, Shuhei Obara, Ken Sakashita, Hiroyuki Sekiya, Hibiki Shinagawa, Bungo Sugashima, Soki Urano","doi":"10.1093/ptep/ptad146","DOIUrl":"https://doi.org/10.1093/ptep/ptad146","url":null,"abstract":"We have been developing a high-pressure xenon gas time projection chamber (TPC) to search for neutrinoless double beta (0νββ) decay of 136Xe. The unique feature of this TPC is in the detection part of ionization electrons, called ELCC. ELCC is composed of multiple units, and one unit covers 48.5cm2. A 180L size prototype detector with 12 units, 672 channels, of ELCC was constructed and operated with 7.6bar natural xenon gas to evaluate the performance of the detector at around the Q value of 136Xe 0νββ. The obtained FWHM energy resolution is 0.73+-0.11% at 1836keV. This corresponds to 0.60+-0.03% to 0.70+-0.21% of energy resolution at the Q value of 136Xe 0νββ. This result shows the scalability of the AXEL detector with ELCC while maintaining high energy resolution. Factors determining the energy resolution were quantitatively evaluated and the result indicates further improvement is feasible. Reconstructed track images show distinctive structures at the endpoint of electron tracks, which will be an important feature to distinguish 0νββ signals from gamma-ray backgrounds.","PeriodicalId":20710,"journal":{"name":"Progress of Theoretical and Experimental Physics","volume":"7 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2023-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138543175","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}

引用次数: 0

Unitarity Violation in Field Theories of Lee-Wick’s Complex Ghost 李-威克复鬼场理论中的单一性违反

IF 3.5 4区物理与天体物理

Progress of Theoretical and Experimental Physics Pub Date : 2023-12-02 DOI: 10.1093/ptep/ptad143

Jisuke Kubo, Taichiro Kugo

{"title":"Unitarity Violation in Field Theories of Lee-Wick’s Complex Ghost","authors":"Jisuke Kubo, Taichiro Kugo","doi":"10.1093/ptep/ptad143","DOIUrl":"https://doi.org/10.1093/ptep/ptad143","url":null,"abstract":"Theories with fourth-order derivatives, including the Lee-Wick finite QED model and Quadratic Gravity, have a better UV behaviour, but the presence of negative metric ghost modes endanger unitarity. Noticing that the ghost acquires a complex mass by radiative corrections, Lee and Wick, in particular, claimed that such complex ghosts would never be created by collisions of physical particles because of energy conservation, so that the physical S-matrix unitarity must hold. We investigate the unitarity problem faithfully working in the operator formalism of quantum field theory. When complex ghosts participate, a complex delta function (generalization of Dirac delta function) appears at each interaction vertex, which enforces a specific conservation law of complex energy. Its particular property implies that the naive Feynman rule is wrong if the four-momenta are assigned to the internal lines after taking account of the conservation law in advance. We show that the complex ghosts are actually created and unitarity is violated in such fourth-order derivative theories. We also find a definite energy threshold below which the ghosts cannot be created: The theories are unitary and renormalizable below the threshold.","PeriodicalId":20710,"journal":{"name":"Progress of Theoretical and Experimental Physics","volume":"55 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2023-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138531450","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}

引用次数: 2

Energy-Momentum and Angular Momentum Densities in Poincaré Gauge Theory of Gravity 庞卡洛引力规范理论中的能量-动量和角动量密度

IF 3.5 4区物理与天体物理

Progress of Theoretical and Experimental Physics Pub Date : 2023-11-30 DOI: 10.1093/ptep/ptad141

Toshiharu Kawai

引用次数: 0

Constraining the cosmological model of modified f(Q) gravity: Phantom dark energy and observational insights 约束修正f(Q)引力的宇宙学模型:幻影暗能量和观测见解

4区物理与天体物理

Progress of Theoretical and Experimental Physics Pub Date : 2023-11-09 DOI: 10.1093/ptep/ptad133

M Koussour, N Myrzakulov, Alnadhief H A Alfedeel, Amare Abebe

{"title":"Constraining the cosmological model of modified <i>f</i>(<i>Q</i>) gravity: Phantom dark energy and observational insights","authors":"M Koussour, N Myrzakulov, Alnadhief H A Alfedeel, Amare Abebe","doi":"10.1093/ptep/ptad133","DOIUrl":"https://doi.org/10.1093/ptep/ptad133","url":null,"abstract":"Abstract Despite the significant accomplishments of general relativity, numerous unresolved issues persist in our understanding of the cosmos. One of the most perplexing challenges is the ongoing accelerated expansion of the Universe, which continues to elude a complete explanation. Consequently, scientists have proposed various alternative theories to GR in pursuit of a deeper understanding. In our analysis, we delve into the recently proposed modified f(Q) gravity, where Q represents the non-metricity scalar responsible for gravitational effects. Specifically, we investigate a cosmological model characterized by the functional form f(Q) = Q + αQn, where α (with α ≠ 0) and n serve as free parameters. Utilizing this functional form, we construct our Hubble rate, incorporating a specific equation of state to describe the cosmic fluid. Furthermore, we leverage a dataset consisting of 31 data points from Hubble measurements and an additional 1048 data points from the Pantheon dataset. These data serve as crucial constraints for our model parameters, and we employ the Markov Chain Monte Carlo (MCMC) method to explore the parameter space and derive meaningful results. With our parameter values constrained, our analysis yields several noteworthy findings. The deceleration parameter suggests a recent accelerated phase in the cosmic expansion. In addition, the EoS parameter paints a portrait of dark energy exhibiting phantom-like characteristics. Furthermore, we delve into the application of cosmological diagnostic tools, specifically the statefinder and the Om(z) diagnostics. Both of these tools align with our previous conclusions, confirming the phantom-like behavior exhibited by our cosmological model. These results collectively contribute to our understanding of the dynamic interplay between gravity, dark energy, and the expanding cosmos.","PeriodicalId":20710,"journal":{"name":"Progress of Theoretical and Experimental Physics","volume":" 36","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135292582","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}

引用次数: 0

A meta-analysis of distance measurements to M87 对M87距离测量的meta分析

4区物理与天体物理

Progress of Theoretical and Experimental Physics Pub Date : 2023-11-08 DOI: 10.1093/ptep/ptad137

Ramakrishnan, Gunasekar, Desai, Shantanu

引用次数: 0

Representation of degree correlation using eigenvalue decomposition and its application to epidemic models 特征值分解的关联度表示及其在流行病模型中的应用

4区物理与天体物理

Progress of Theoretical and Experimental Physics Pub Date : 2023-11-02 DOI: 10.1093/ptep/ptad132

Satoru Morita

引用次数: 0