Pub Date : 2024-06-14DOI: 10.1016/j.nuclphysb.2024.116601
Jun Guo , Qiang Yuan , Bin Zhu
Primordial black holes (PBHs), originating from the gravitational collapse of large overdensities in the early Universe, emerge as a compelling dark matter (DM) candidate across a broad mass range. Of particular interest are ultra-light PBHs with masses around 1014 to 1017 g, which are typically probed by searching their evaporation products. Using the soft X-ray signal measured by the XMM telescopes, we derive constraints on the fraction of PBHs dark matter with masses in the range 1015-1016 g. We find that observations exclude fraction at 95% C.L. for mass g.
原始黑洞(PBHs)起源于早期宇宙中大超密度的引力坍缩,在广泛的质量范围内是一种引人注目的暗物质(DM)候选物质。质量在1014克到1017克之间的超轻黑洞尤其引人关注,人们通常通过搜索它们的蒸发产物来探测它们。利用 XMM 望远镜测量到的软 X 射线信号,我们推导出了质量在 1015-1016 g 范围内的 PBHs 暗物质分数的约束条件。我们发现,观测结果排除了质量 MPBH=1015 g 的分数 f>10-6 (95% C.L.)。
{"title":"Probing ultralight primordial black hole dark matter with XMM telescopes","authors":"Jun Guo , Qiang Yuan , Bin Zhu","doi":"10.1016/j.nuclphysb.2024.116601","DOIUrl":"10.1016/j.nuclphysb.2024.116601","url":null,"abstract":"<div><p>Primordial black holes (PBHs), originating from the gravitational collapse of large overdensities in the early Universe, emerge as a compelling dark matter (DM) candidate across a broad mass range. Of particular interest are ultra-light PBHs with masses around 10<sup>14</sup> to 10<sup>17</sup> g, which are typically probed by searching their evaporation products. Using the soft X-ray signal measured by the XMM telescopes, we derive constraints on the fraction of PBHs dark matter with masses in the range 10<sup>15</sup>-10<sup>16</sup> g. We find that observations exclude fraction <span><math><mi>f</mi><mo>></mo><msup><mrow><mn>10</mn></mrow><mrow><mo>−</mo><mn>6</mn></mrow></msup></math></span> at 95% C.L. for mass <span><math><msub><mrow><mi>M</mi></mrow><mrow><mi>PBH</mi></mrow></msub><mo>=</mo><msup><mrow><mn>10</mn></mrow><mrow><mn>15</mn></mrow></msup></math></span> g.</p></div>","PeriodicalId":54712,"journal":{"name":"Nuclear Physics B","volume":null,"pages":null},"PeriodicalIF":2.8,"publicationDate":"2024-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0550321324001676/pdfft?md5=a8e18cc72e8c5b9534b830b150a57934&pid=1-s2.0-S0550321324001676-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141393104","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-06-14DOI: 10.1016/j.nuclphysb.2024.116599
Hiroyuki Takata
We have discovered two unconstrained forms of free Lagrangian for continuous spin(CS) theory in arbitrary flat spacetime dimension for bosonic case. These Lagrangians, unlike that by Schuster and Toro, do not include delta functions and are conventional. The first form consists of five kinds of totally symmetric helicity fields and one kind of gauge parameter. By introducing auxiliary creation and annihilation operators, each is combined into a state vector in Fock space, including all ranks one by one. The Lagrangian imposes no constraints, such as trace conditions, on these fields or the gauge parameter field. Additionally, the Lagrangian does not contain higher-order derivative terms. In the limit as CS parameter μ approaches zero, it naturally reproduces a Lagrangian for helicity fields in higher spin(HS) theory, known as unconstrained quartet formulation. Permitting third-order derivatives, we also obtain the second unconstrained form of Lagrangian that can be written in terms of three kinds of fields, including μ, similar to the formulation by Francia and Sagnotti. Partial gauge fixing and partial use of equations of motion (EOM) on this Lagrangian yield a Fronsdal-like Lagrangian with a single double-traceless field, including μ. By imposing further gauge fixing on the field in the EOM with respect to divergence and trace, we confirm the reproduction of the modified Wigner equations already known in literature.
{"title":"Unconstrained Lagrangian formulation for bosonic continuous spin theory in flat spacetime of arbitrary dimension","authors":"Hiroyuki Takata","doi":"10.1016/j.nuclphysb.2024.116599","DOIUrl":"https://doi.org/10.1016/j.nuclphysb.2024.116599","url":null,"abstract":"<div><p>We have discovered two unconstrained forms of free Lagrangian for continuous spin(CS) theory in arbitrary flat spacetime dimension for bosonic case. These Lagrangians, unlike that by Schuster and Toro, do not include delta functions and are conventional. The first form consists of five kinds of totally symmetric helicity fields and one kind of gauge parameter. By introducing auxiliary creation and annihilation operators, each is combined into a state vector in Fock space, including all ranks one by one. The Lagrangian imposes no constraints, such as trace conditions, on these fields or the gauge parameter field. Additionally, the Lagrangian does not contain higher-order derivative terms. In the limit as CS parameter <em>μ</em> approaches zero, it naturally reproduces a Lagrangian for helicity fields in higher spin(HS) theory, known as unconstrained quartet formulation. Permitting third-order derivatives, we also obtain the second unconstrained form of Lagrangian that can be written in terms of three kinds of fields, including <em>μ</em>, similar to the formulation by Francia and Sagnotti. Partial gauge fixing and partial use of equations of motion (EOM) on this Lagrangian yield a Fronsdal-like Lagrangian with a single double-traceless field, including <em>μ</em>. By imposing further gauge fixing on the field in the EOM with respect to divergence and trace, we confirm the reproduction of the modified Wigner equations already known in literature.</p></div>","PeriodicalId":54712,"journal":{"name":"Nuclear Physics B","volume":null,"pages":null},"PeriodicalIF":2.5,"publicationDate":"2024-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0550321324001652/pdfft?md5=54075bd96bdc99b71262c07e7b8f3fbc&pid=1-s2.0-S0550321324001652-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141543683","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-06-14DOI: 10.1016/j.nuclphysb.2024.116600
I. Andrade , M.A. Marques , R. Menezes , D.C. Moreira
In this work, we investigate probe scalar field models preserving covariance on fixed, static background geometries that present hyperscaling violation properties. We develop a first-order framework that rises from restrictions on the dynamical and hyperscaling violating exponents. The results show that stable, analytical kink-like solutions and their respective energy densities can be obtained for a general class of models. In the canonical model, in particular, these solutions minimize the energy of the system.
{"title":"Spatially localized scalar structures on hyperscaling violating geometries","authors":"I. Andrade , M.A. Marques , R. Menezes , D.C. Moreira","doi":"10.1016/j.nuclphysb.2024.116600","DOIUrl":"https://doi.org/10.1016/j.nuclphysb.2024.116600","url":null,"abstract":"<div><p>In this work, we investigate probe scalar field models preserving covariance on fixed, static background geometries that present hyperscaling violation properties. We develop a first-order framework that rises from restrictions on the dynamical and hyperscaling violating exponents. The results show that stable, analytical kink-like solutions and their respective energy densities can be obtained for a general class of models. In the canonical model, in particular, these solutions minimize the energy of the system.</p></div>","PeriodicalId":54712,"journal":{"name":"Nuclear Physics B","volume":null,"pages":null},"PeriodicalIF":2.8,"publicationDate":"2024-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0550321324001664/pdfft?md5=643350c2791a7c26747012da98b835f2&pid=1-s2.0-S0550321324001664-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141428810","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-06-14DOI: 10.1016/j.nuclphysb.2024.116602
Wenming Chen , Yu Gao , Qiaoli Yang
Cosmological axions/axion-like particles can compose a significant part of dark matter; however, the uncertainty of their mass is large. Here, we propose to search the axions using a cylindrical capacitor, in which the static electric field converts dark matter axions into an oscillating magnetic field. Due to the odd CPs, the axions couple to the electric field differently compared to the magnetic field. The axion couples to the electric field via a derivative that carries spatial information of incoming dark matter flux, while the coupling to the magnetic field depends on the dark matter density. This difference could be helpful in searching the axions and studies of the integrity of the theory, especially when the axions are very light, in which case the magnetic field-induced signal is DC-like. Orientation dependence could also be used to reduce the kinetic fluctuation-induced noise when multiple detectors operate simultaneously. In addition, a cylindrical setup shields the electric field to the laboratory and encompasses the axion-induced magnetic field within the capacitor. The induced oscillating magnetic field can then be picked up by a sensitive magnetometer. Adding a superconductor ring-coil system into the scheme can further boost the sensitivity and maintain the axion dark matter inherent bandwidth. This proposed setup could be capable of wide mass range searches.
{"title":"Broadband dark matter axion detection using a cylindrical capacitor","authors":"Wenming Chen , Yu Gao , Qiaoli Yang","doi":"10.1016/j.nuclphysb.2024.116602","DOIUrl":"https://doi.org/10.1016/j.nuclphysb.2024.116602","url":null,"abstract":"<div><p>Cosmological axions/axion-like particles can compose a significant part of dark matter; however, the uncertainty of their mass is large. Here, we propose to search the axions using a cylindrical capacitor, in which the static electric field converts dark matter axions into an oscillating magnetic field. Due to the odd CPs, the axions couple to the electric field differently compared to the magnetic field. The axion couples to the electric field via a derivative that carries spatial information of incoming dark matter flux, while the coupling to the magnetic field depends on the dark matter density. This difference could be helpful in searching the axions and studies of the integrity of the theory, especially when the axions are very light, in which case the magnetic field-induced signal is DC-like. Orientation dependence could also be used to reduce the kinetic fluctuation-induced noise when multiple detectors operate simultaneously. In addition, a cylindrical setup shields the electric field to the laboratory and encompasses the axion-induced magnetic field within the capacitor. The induced oscillating magnetic field can then be picked up by a sensitive magnetometer. Adding a superconductor ring-coil system into the scheme can further boost the sensitivity and maintain the axion dark matter inherent bandwidth. This proposed setup could be capable of wide mass range searches.</p></div>","PeriodicalId":54712,"journal":{"name":"Nuclear Physics B","volume":null,"pages":null},"PeriodicalIF":2.8,"publicationDate":"2024-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0550321324001688/pdfft?md5=f0c3a44037947be68b0803bf04cef3c8&pid=1-s2.0-S0550321324001688-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141428809","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-06-13DOI: 10.1016/j.nuclphysb.2024.116605
Tommaso Morone , Stefano Negro , Roberto Tateo
We study systems in arbitrary space-time dimensions where matter, deformed by -like irrelevant operators, is coupled to gravity in the Palatini formalism. The dynamically equivalent perspective is investigated, wherein the deformation transitions from the matter action to the gravitational one or vice versa. This alternative viewpoint leads to the emergence of Ricci-based gravity theories, thus providing a high-dimensional generalisation of the well-known equivalence between two-dimensional deformations and coupling to Jackiw-Teitelboim gravity. This dynamical equivalence is examined within the framework of the recently introduced Lagrangian flow equation, which notably led to the discovery of a direct link between Nambu-Goto theory and in , as well as significant insights into nonlinear electrodynamics models in . The investigation involves explicit examples in dimensions; it builds upon earlier research concerning the metric interpretation of -like perturbations, incorporates and extends recent findings in the cosmology-related literature associated to the concept of reframing. We focus on scenarios where the resulting modified gravity theories manifest as Born-Infeld and Starobinsky types.
{"title":"Gravity and TT‾ flows in higher dimensions","authors":"Tommaso Morone , Stefano Negro , Roberto Tateo","doi":"10.1016/j.nuclphysb.2024.116605","DOIUrl":"10.1016/j.nuclphysb.2024.116605","url":null,"abstract":"<div><p>We study systems in arbitrary space-time dimensions where matter, deformed by <span><math><mi>T</mi><mover><mrow><mi>T</mi></mrow><mo>‾</mo></mover></math></span>-like irrelevant operators, is coupled to gravity in the Palatini formalism. The dynamically equivalent perspective is investigated, wherein the deformation transitions from the matter action to the gravitational one or vice versa. This alternative viewpoint leads to the emergence of Ricci-based gravity theories, thus providing a high-dimensional generalisation of the well-known equivalence between two-dimensional <span><math><mi>T</mi><mover><mrow><mi>T</mi></mrow><mo>‾</mo></mover></math></span> deformations and coupling to Jackiw-Teitelboim gravity. This dynamical equivalence is examined within the framework of the recently introduced Lagrangian flow equation, which notably led to the discovery of a direct link between Nambu-Goto theory and <span><math><mi>T</mi><mover><mrow><mi>T</mi></mrow><mo>‾</mo></mover></math></span> in <span><math><mi>d</mi><mo>=</mo><mn>2</mn></math></span>, as well as significant insights into nonlinear electrodynamics models in <span><math><mi>d</mi><mo>=</mo><mn>4</mn></math></span>. The investigation involves explicit examples in <span><math><mi>d</mi><mo>=</mo><mn>4</mn></math></span> dimensions; it builds upon earlier research concerning the metric interpretation of <span><math><mi>T</mi><mover><mrow><mi>T</mi></mrow><mo>‾</mo></mover></math></span>-like perturbations, incorporates and extends recent findings in the cosmology-related literature associated to the concept of reframing. We focus on scenarios where the resulting modified gravity theories manifest as Born-Infeld and Starobinsky types.</p></div>","PeriodicalId":54712,"journal":{"name":"Nuclear Physics B","volume":null,"pages":null},"PeriodicalIF":2.8,"publicationDate":"2024-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0550321324001718/pdfft?md5=9412976a6ccba7b93bcd80e0f55a0d59&pid=1-s2.0-S0550321324001718-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141401168","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-06-11DOI: 10.1016/j.nuclphysb.2024.116596
Pujian Mao, Weicheng Zhao
In this paper, we revisit the no black hole theorem in three dimensional (3D) gravity in the Newman-Penrose formalism in a generalized Newman-Unti gauge. After adapting the well established 4D NP formalism and its gauge and coordinates system to 3D gravity, we show that the no black hole theorem is manifest in the NP equations. We further study in detail the horizon properties of the 3D charged rotating solutions and confirm that a black hole solution requires a negative cosmological constant.
{"title":"Notes on no black hole theorem in three dimensional gravity","authors":"Pujian Mao, Weicheng Zhao","doi":"10.1016/j.nuclphysb.2024.116596","DOIUrl":"https://doi.org/10.1016/j.nuclphysb.2024.116596","url":null,"abstract":"<div><p>In this paper, we revisit the no black hole theorem in three dimensional (3D) gravity in the Newman-Penrose formalism in a generalized Newman-Unti gauge. After adapting the well established 4D NP formalism and its gauge and coordinates system to 3D gravity, we show that the no black hole theorem is manifest in the NP equations. We further study in detail the horizon properties of the 3D charged rotating solutions and confirm that a black hole solution requires a negative cosmological constant.</p></div>","PeriodicalId":54712,"journal":{"name":"Nuclear Physics B","volume":null,"pages":null},"PeriodicalIF":2.8,"publicationDate":"2024-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0550321324001627/pdfft?md5=d3c4e5340bf10a5f56ed55d222d1aec7&pid=1-s2.0-S0550321324001627-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141424356","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-06-11DOI: 10.1016/j.nuclphysb.2024.116595
Kazuki Hasebe
Exploiting analogies between the precessing quantum spin system and the charge-monopole system, we construct Bloch hyper-spheres with exact spherical symmetries in arbitrary dimensions. Such Bloch hyper-spheres are realized as a collection of the orbits of a precessing quantum spin. The geometry of Bloch hyper-spheres is exactly equal to the quantum Nambu geometry of higher dimensional fuzzy spheres. The stabilizer group symmetry of the Bloch hyper-sphere necessarily introduces degenerate spin-coherent states, giving rise to the Wilczek-Zee geometric phase of non-Abelian monopoles associated with the hyper-sphere holonomy. The degenerate spin-coherent states induce matrix-valued quantum geometric tensors. While the minimal spin Bloch hyper-spheres exhibit similar properties in even and odd dimensions, their large spin counterparts differ qualitatively depending on the parity of the dimensions. Exact correspondences between spin-coherent states and monopole harmonics in higher dimensions are established. We also investigate density matrices described by Bloch hyper-balls and elucidate their corresponding statistical and geometric properties, such as von Neumann entropies and Bures quantum metrics.
{"title":"Perfectly spherical Bloch hyper-spheres from quantum matrix geometry","authors":"Kazuki Hasebe","doi":"10.1016/j.nuclphysb.2024.116595","DOIUrl":"https://doi.org/10.1016/j.nuclphysb.2024.116595","url":null,"abstract":"<div><p>Exploiting analogies between the precessing quantum spin system and the charge-monopole system, we construct Bloch hyper-spheres with <em>exact</em> spherical symmetries in arbitrary dimensions. Such Bloch hyper-spheres are realized as a collection of the orbits of a precessing quantum spin. The geometry of Bloch hyper-spheres is exactly equal to the quantum Nambu geometry of higher dimensional fuzzy spheres. The stabilizer group symmetry of the Bloch hyper-sphere necessarily introduces degenerate spin-coherent states, giving rise to the Wilczek-Zee geometric phase of non-Abelian monopoles associated with the hyper-sphere holonomy. The degenerate spin-coherent states induce matrix-valued quantum geometric tensors. While the minimal spin Bloch hyper-spheres exhibit similar properties in even and odd dimensions, their large spin counterparts differ qualitatively depending on the parity of the dimensions. Exact correspondences between spin-coherent states and monopole harmonics in higher dimensions are established. We also investigate density matrices described by Bloch hyper-balls and elucidate their corresponding statistical and geometric properties, such as von Neumann entropies and Bures quantum metrics.</p></div>","PeriodicalId":54712,"journal":{"name":"Nuclear Physics B","volume":null,"pages":null},"PeriodicalIF":2.5,"publicationDate":"2024-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0550321324001615/pdfft?md5=188373ef7e2f33bd6b091e20f5180522&pid=1-s2.0-S0550321324001615-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141486389","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-06-11DOI: 10.1016/j.nuclphysb.2024.116593
R. Benbrik , M. Boukidi , B. Manaut
In this study, we investigate the anomalous magnetic moment of the muon as reported by Fermilab (FNAL), along with the recent measurement of the W-boson mass by the CDF-II collaboration. Both findings show significant deviations from the predictions of the Standard Model (SM), hinting at the possibility of new physics. Our focus is on the Type III two-Higgs-doublet model (2HDM), wherein both Higgs doublets couple with all fermions, leading to the induction of flavour-changing neutral currents (FCNCs) at the tree level. Within this framework, we investigate a lepton-flavour-violating (LFV) scenario, aiming to explain both observed anomalies, while satisfying the up-to-date theoretical and experimental constraints.
在这项研究中,我们研究了费米实验室(FNAL)报告的μ介子反常磁矩(gμ-2),以及 CDF-II 协作最近测量的 W 玻色子质量。这两项发现都显示出与标准模型(SM)预测的重大偏差,暗示了新物理学的可能性。我们的重点是第三类双希格斯双重模型(2HDM),其中两个希格斯双重与所有费米子耦合,导致在树级诱导出味变中性电流(FCNCs)。在这一框架内,我们研究了一种轻子-味道侵犯(LFV)情景,旨在解释观测到的两种反常现象,同时满足最新的理论和实验约束。
{"title":"Interpreting the W-mass and muon (gμ − 2) anomalies within a 2-Higgs doublet model","authors":"R. Benbrik , M. Boukidi , B. Manaut","doi":"10.1016/j.nuclphysb.2024.116593","DOIUrl":"10.1016/j.nuclphysb.2024.116593","url":null,"abstract":"<div><p>In this study, we investigate the anomalous magnetic moment of the muon <span><math><mo>(</mo><msub><mrow><mi>g</mi></mrow><mrow><mi>μ</mi></mrow></msub><mo>−</mo><mn>2</mn><mo>)</mo></math></span> as reported by Fermilab (FNAL), along with the recent measurement of the <em>W</em>-boson mass by the CDF-II collaboration. Both findings show significant deviations from the predictions of the Standard Model (SM), hinting at the possibility of new physics. Our focus is on the Type III two-Higgs-doublet model (2HDM), wherein both Higgs doublets couple with all fermions, leading to the induction of flavour-changing neutral currents (FCNCs) at the tree level. Within this framework, we investigate a lepton-flavour-violating (LFV) scenario, aiming to explain both observed anomalies, while satisfying the up-to-date theoretical and experimental constraints.</p></div>","PeriodicalId":54712,"journal":{"name":"Nuclear Physics B","volume":null,"pages":null},"PeriodicalIF":2.8,"publicationDate":"2024-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0550321324001597/pdfft?md5=914e68bf933431d321849d56b7f19b5a&pid=1-s2.0-S0550321324001597-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141403564","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-06-07DOI: 10.1016/j.nuclphysb.2024.116587
Gesualdo Delfino , Marianna Sorba
We consider d-dimensional quantum systems which for positive times evolve with a time-independent Hamiltonian in a nonequilibrium state that we keep generic in order to account for arbitrary evolution at negative times. We show how the one-point functions of local operators depend on the coefficients of the expansion of the nonequilibrium state on the basis of energy eigenstates. We express in this way the asymptotic offset and show under which conditions oscillations around this value stay undamped at large times. We also show how, in the case of small quenches, the structure of the general results simplifies and reproduces that known perturbatively.
我们考虑了 d 维量子系统,这些系统在正时间内以非平衡态中与时间无关的哈密顿演化,为了考虑负时间内的任意演化,我们将该非平衡态保持为通用态。我们展示了局部算子的单点函数如何取决于非平衡态在能量特征状态基础上的展开系数。我们用这种方式表达了渐近偏移量,并展示了在哪些条件下,围绕该值的振荡在大时间内保持无阻尼。我们还展示了在小淬火的情况下,一般结果的结构是如何简化并重现扰动已知结果的。
{"title":"On unitary time evolution out of equilibrium","authors":"Gesualdo Delfino , Marianna Sorba","doi":"10.1016/j.nuclphysb.2024.116587","DOIUrl":"https://doi.org/10.1016/j.nuclphysb.2024.116587","url":null,"abstract":"<div><p>We consider <em>d</em>-dimensional quantum systems which for positive times evolve with a time-independent Hamiltonian in a nonequilibrium state that we keep generic in order to account for arbitrary evolution at negative times. We show how the one-point functions of local operators depend on the coefficients of the expansion of the nonequilibrium state on the basis of energy eigenstates. We express in this way the asymptotic offset and show under which conditions oscillations around this value stay undamped at large times. We also show how, in the case of small quenches, the structure of the general results simplifies and reproduces that known perturbatively.</p></div>","PeriodicalId":54712,"journal":{"name":"Nuclear Physics B","volume":null,"pages":null},"PeriodicalIF":2.8,"publicationDate":"2024-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0550321324001536/pdfft?md5=9a50aaf53d1cea46ed4ebd58bff1ba02&pid=1-s2.0-S0550321324001536-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141424357","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-06-07DOI: 10.1016/j.nuclphysb.2024.116580
Zhi-Gang Wang
We suppose that there exist three vector hidden-charm tetraquark states with the at the energy about , and investigate the two-body strong decays systematically. We obtain thirty QCD sum rules for the hadronic coupling constants based on rigorous quark-hadron duality, then obtain the partial decay widths, therefore the total widths approximately, which are compatible with the experimental data of the from the BESIII collaboration. The may be one vector tetraquark state having three main Fock components, or consists of three different vector tetraquark states. We can search for the typical decays , , ,
{"title":"Strong decays of the vector tetraquark states with the masses about 4.5 GeV via the QCD sum rules","authors":"Zhi-Gang Wang","doi":"10.1016/j.nuclphysb.2024.116580","DOIUrl":"https://doi.org/10.1016/j.nuclphysb.2024.116580","url":null,"abstract":"<div><p>We suppose that there exist three vector hidden-charm tetraquark states with the <span><math><msup><mrow><mi>J</mi></mrow><mrow><mi>P</mi><mi>C</mi></mrow></msup><mo>=</mo><msup><mrow><mn>1</mn></mrow><mrow><mo>−</mo><mo>−</mo></mrow></msup></math></span> at the energy about <span><math><mn>4.5</mn><mspace></mspace><mrow><mi>GeV</mi></mrow></math></span>, and investigate the two-body strong decays systematically. We obtain thirty QCD sum rules for the hadronic coupling constants based on rigorous quark-hadron duality, then obtain the partial decay widths, therefore the total widths approximately, which are compatible with the experimental data of the <span><math><mi>Y</mi><mo>(</mo><mn>4500</mn><mo>)</mo></math></span> from the BESIII collaboration. The <span><math><mi>Y</mi><mo>(</mo><mn>4500</mn><mo>)</mo></math></span> may be one vector tetraquark state having three main Fock components, or consists of three different vector tetraquark states. We can search for the typical decays <span><math><mi>Y</mi><mo>→</mo><mfrac><mrow><msubsup><mrow><mover><mrow><mi>D</mi></mrow><mrow><mo>¯</mo></mrow></mover></mrow><mrow><mn>1</mn></mrow><mrow><mn>0</mn></mrow></msubsup><msup><mrow><mi>D</mi></mrow><mrow><mn>0</mn></mrow></msup><mo>−</mo><msup><mrow><mover><mrow><mi>D</mi></mrow><mrow><mo>¯</mo></mrow></mover></mrow><mrow><mn>0</mn></mrow></msup><msubsup><mrow><mi>D</mi></mrow><mrow><mn>1</mn></mrow><mrow><mn>0</mn></mrow></msubsup></mrow><mrow><msqrt><mrow><mn>2</mn></mrow></msqrt></mrow></mfrac></math></span>, <span><math><mfrac><mrow><msubsup><mrow><mover><mrow><mi>D</mi></mrow><mrow><mo>¯</mo></mrow></mover></mrow><mrow><mn>1</mn></mrow><mrow><mo>−</mo></mrow></msubsup><msup><mrow><mi>D</mi></mrow><mrow><mo>+</mo></mrow></msup><mo>−</mo><msup><mrow><mover><mrow><mi>D</mi></mrow><mrow><mo>¯</mo></mrow></mover></mrow><mrow><mo>−</mo></mrow></msup><msubsup><mrow><mi>D</mi></mrow><mrow><mn>1</mn></mrow><mrow><mo>+</mo></mrow></msubsup></mrow><mrow><msqrt><mrow><mn>2</mn></mrow></msqrt></mrow></mfrac></math></span>, <span><math><mfrac><mrow><msubsup><mrow><mover><mrow><mi>D</mi></mrow><mrow><mo>¯</mo></mrow></mover></mrow><mrow><mn>0</mn></mrow><mrow><mn>0</mn></mrow></msubsup><msup><mrow><mi>D</mi></mrow><mrow><mo>⁎</mo><mn>0</mn></mrow></msup><mo>−</mo><msup><mrow><mover><mrow><mi>D</mi></mrow><mrow><mo>¯</mo></mrow></mover></mrow><mrow><mo>⁎</mo><mn>0</mn></mrow></msup><msubsup><mrow><mi>D</mi></mrow><mrow><mn>0</mn></mrow><mrow><mn>0</mn></mrow></msubsup></mrow><mrow><msqrt><mrow><mn>2</mn></mrow></msqrt></mrow></mfrac></math></span>, <span><math><mfrac><mrow><msubsup><mrow><mover><mrow><mi>D</mi></mrow><mrow><mo>¯</mo></mrow></mover></mrow><mrow><mn>0</mn></mrow><mrow><mo>−</mo></mrow></msubsup><msup><mrow><mi>D</mi></mrow><mrow><mo>⁎</mo><mo>+</mo></mrow></msup><mo>−</mo><msup><mrow><mover><mrow><mi>D</mi></mrow><mrow><mo>¯</mo></mrow></mover></mrow><mrow><mo>⁎</mo><mo>−</mo></mrow></msup><msubsup><mrow><mi>D</mi></mrow><mrow><mn>0</mn></mr","PeriodicalId":54712,"journal":{"name":"Nuclear Physics B","volume":null,"pages":null},"PeriodicalIF":2.8,"publicationDate":"2024-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0550321324001469/pdfft?md5=47be404d5fdf91267f491db09942efa6&pid=1-s2.0-S0550321324001469-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141308338","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}