In this study, we explore the impact of the interacting parameter on dark matter in a model resulting from a parametrization of dark energy density. To ensure a model-independent approach, we treat as a free parameter, avoiding assumptions about the physics of the early Universe or specific recombination models. This approach allows late-time cosmological observations to directly constrain along with other parameters. Using recent measurements from the Dark Energy Spectroscopic Instrument (DESI) Year 1, cosmic chronometers (CC) and Pantheon supernova (SNe Ia) data, we uncover a significant effect of the interacting parameter on dark matter. Our analysis reveals that while non-interacting models attribute 68.2% of the cosmic energy density to dark energy, interacting models increase this share to 73.4%. To further probe these differences, we evaluate the evolution of the deceleration parameter for each model, contrasting them against the CDM paradigm and observational data from CC and SNe Ia measurements. Finally, we apply various statistical metrics to rigorously assess the performance of these models.
{"title":"Dark sector interactions: Probing the Hubble parameter and the sound horizon","authors":"Ritika Nagpal , S.K.J. Pacif , Farruh Atamurotov , Rasmikanta Pati","doi":"10.1016/j.aop.2025.170249","DOIUrl":"10.1016/j.aop.2025.170249","url":null,"abstract":"<div><div>In this study, we explore the impact of the interacting parameter on dark matter in a model resulting from a parametrization of dark energy density. To ensure a model-independent approach, we treat <span><math><msub><mrow><mi>r</mi></mrow><mrow><mi>d</mi></mrow></msub></math></span> as a free parameter, avoiding assumptions about the physics of the early Universe or specific recombination models. This approach allows late-time cosmological observations to directly constrain <span><math><msub><mrow><mi>r</mi></mrow><mrow><mi>d</mi></mrow></msub></math></span> along with other parameters. Using recent measurements from the Dark Energy Spectroscopic Instrument (DESI) Year 1, cosmic chronometers (CC) and Pantheon<span><math><msup><mrow></mrow><mrow><mo>+</mo></mrow></msup></math></span> supernova (SNe Ia) data, we uncover a significant effect of the interacting parameter on dark matter. Our analysis reveals that while non-interacting models attribute 68.2% of the cosmic energy density to dark energy, interacting models increase this share to 73.4%. To further probe these differences, we evaluate the evolution of the deceleration parameter for each model, contrasting them against the <span><math><mi>Λ</mi></math></span>CDM paradigm and observational data from CC and SNe Ia measurements. Finally, we apply various statistical metrics to rigorously assess the performance of these models.</div></div>","PeriodicalId":8249,"journal":{"name":"Annals of Physics","volume":"483 ","pages":"Article 170249"},"PeriodicalIF":3.0,"publicationDate":"2025-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145360157","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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}
Pub Date : 2025-10-21DOI: 10.1016/j.aop.2025.170275
Archana Dixit , Manish Yadav , Anirudh Pradhan , M.S. Barak
In this work, we investigate a cosmological scenario with a time-dependent cosmological constant (t) within the spatially flat Friedmann–Lemaître–Robertson–Walker (FLRW) framework. Here we study a power-law CDM model characterized by a dynamic cosmological constant expressed as a function of the Hubble parameter and its derivative Using recent observational datasets (DESI BAO, OHD, and PP&SH0ES), we constrain the model’s free parameters and analyze their impact on key cosmological quantities. A Markov chain Monte Carlo (MCMC) analysis of the best-fit value of km/s/Mpc from PP&SH0ES analysis only, which substantially alleviates the existing tension between early and late-time determinations of the Hubble constant, reducing it to . The reconstructed diagnostic exhibits a negative slope, indicating a dynamic dark energy behavior with quintessence-like characteristics (). These results suggest that the proposed model provides a viable alternative to the standard CDM paradigm to explain the late-time acceleration of the universe. Our findings show that this model alleviates the Hubble tension more effectively than the standard CDM. The model also demonstrates compatibility with late-time Hubble parameter observations and offers a compelling framework to address the limitations of CDM.
在这项工作中，我们在空间平坦的friedman - lema - robert - walker （FLRW）框架中研究了具有时间依赖的宇宙学常数Λ(t)的宇宙学场景。本文研究了一个幂律Λ(t)CDM模型，其特征是动力学宇宙常数表示为哈勃参数的函数及其导数Λ(t) =α（Ḣ+H2）+ Λ H2+4π ρη。利用最近的观测数据集（DESI BAO， OHD和pp&&； SH0ES），我们约束了模型的自由参数（H0,α,λ,η），并分析了它们对关键宇宙学量的影响。马尔可夫链蒙特卡罗(密度)的最佳价值分析H0 = 71.9±0.23 km / s / Mpc PP& SH0ES分析,这大大减轻现有的早期和后期数据决定的哈勃常数之间的紧张关系,减少∼1.5σ。重构的Om诊断曲线呈现负斜率，表明暗能量的动态行为具有类似精粹的特征（ω>−1）。这些结果表明，提出的Λ(t)模型提供了一个可行的替代标准ΛCDM范式来解释宇宙的后期加速。我们的发现表明，这个模型比标准模型更有效地缓解了哈勃张力ΛCDM。该模型还证明了与后期哈勃参数观测的兼容性，并提供了一个令人信服的框架来解决ΛCDM的局限性。
{"title":"Beyond ΛCDM: Exploring a dynamical cosmological constant framework consistent with late-time observations","authors":"Archana Dixit , Manish Yadav , Anirudh Pradhan , M.S. Barak","doi":"10.1016/j.aop.2025.170275","DOIUrl":"10.1016/j.aop.2025.170275","url":null,"abstract":"<div><div>In this work, we investigate a cosmological scenario with a time-dependent cosmological constant <span><math><mi>Λ</mi></math></span>(t) within the spatially flat Friedmann–Lemaître–Robertson–Walker (FLRW) framework. Here we study a power-law <span><math><mrow><mi>Λ</mi><mrow><mo>(</mo><mi>t</mi><mo>)</mo></mrow></mrow></math></span>CDM model characterized by a dynamic cosmological constant expressed as a function of the Hubble parameter and its derivative <span><math><mrow><mi>Λ</mi><mrow><mo>(</mo><mi>t</mi><mo>)</mo></mrow></mrow></math></span> <span><math><mrow><mo>=</mo><mi>α</mi><mrow><mo>(</mo><mover><mrow><mi>H</mi></mrow><mrow><mo>̇</mo></mrow></mover><mo>+</mo><msup><mrow><mi>H</mi></mrow><mrow><mn>2</mn></mrow></msup><mo>)</mo></mrow><mo>+</mo><mi>λ</mi><msup><mrow><mi>H</mi></mrow><mrow><mn>2</mn></mrow></msup><mo>+</mo><mn>4</mn><mi>π</mi><mi>G</mi><mi>ρ</mi><mi>η</mi><mo>.</mo></mrow></math></span> Using recent observational datasets (DESI BAO, OHD, and PP&SH0ES), we constrain the model’s free parameters <span><math><mrow><mo>(</mo><msub><mrow><mi>H</mi></mrow><mrow><mn>0</mn></mrow></msub><mo>,</mo><mi>α</mi><mo>,</mo><mi>λ</mi><mo>,</mo><mi>η</mi><mo>)</mo></mrow></math></span> and analyze their impact on key cosmological quantities. A Markov chain Monte Carlo (MCMC) analysis of the best-fit value of <span><math><mrow><msub><mrow><mi>H</mi></mrow><mrow><mn>0</mn></mrow></msub><mo>=</mo><mn>71</mn><mo>.</mo><mn>9</mn><mo>±</mo><mn>0</mn><mo>.</mo><mn>23</mn></mrow></math></span> km/s/Mpc from PP&SH0ES analysis only, which substantially alleviates the existing tension between early and late-time determinations of the Hubble constant, reducing it to <span><math><mrow><mo>∼</mo><mn>1</mn><mo>.</mo><mn>5</mn><mi>σ</mi></mrow></math></span>. The reconstructed <span><math><mrow><mi>O</mi><mi>m</mi></mrow></math></span> diagnostic exhibits a negative slope, indicating a dynamic dark energy behavior with quintessence-like characteristics (<span><math><mrow><mi>ω</mi><mo>></mo><mo>−</mo><mn>1</mn></mrow></math></span>). These results suggest that the proposed <span><math><mrow><mi>Λ</mi><mrow><mo>(</mo><mi>t</mi><mo>)</mo></mrow></mrow></math></span> model provides a viable alternative to the standard <span><math><mi>Λ</mi></math></span>CDM paradigm to explain the late-time acceleration of the universe. Our findings show that this model alleviates the Hubble tension more effectively than the standard <span><math><mi>Λ</mi></math></span>CDM. The model also demonstrates compatibility with late-time Hubble parameter observations and offers a compelling framework to address the limitations of <span><math><mi>Λ</mi></math></span>CDM.</div></div>","PeriodicalId":8249,"journal":{"name":"Annals of Physics","volume":"483 ","pages":"Article 170275"},"PeriodicalIF":3.0,"publicationDate":"2025-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145360156","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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}
Pub Date : 2025-10-21DOI: 10.1016/j.aop.2025.170265
Azadeh Faridi , Reza Asgari
We investigate both intrinsic and extrinsic orbital Hall effects (OHE) in bilayer transition metal dichalcogenides (TMDs) in the presence of short-range disorder using quantum kinetic theory. Bilayer TMDs provide an ideal platform to study the effects of inversion symmetry breaking on transport properties due to their unique structural and electronic characteristics. While bilayer TMDs are naturally inversion symmetric, applying a finite gate voltage to create a bias between the layers effectively breaks this symmetry. Our findings reveal that slightly away from the band edges, the extrinsic OHE eventually becomes the dominant contribution in both inversion-symmetric and asymmetric cases, with its prominence increasing significantly as a function of Fermi energy. Furthermore, we demonstrate that breaking inversion symmetry greatly enhances the extrinsic OHE. This enhancement arises from the fundamentally distinct behavior of orbital angular momentum (OAM) in centrosymmetric systems, where intraband components vanish due to symmetry constraints. As a result, in centrosymmetric systems, only the off-diagonal components of the density matrix contribute to the extrinsic OHE. In contrast, in noncentrosymmetric systems, both diagonal and off-diagonal components play a role. Our study suggests that in experimentally relevant highly doped systems, the OHE becomes predominantly extrinsic in both centrosymmetric and noncentrosymmetric although the contribution is much more pronounced in the latter. Importantly, we infer that even a weakly breaking of inversion symmetry can lead to a dramatic enhancement of the OHE, a finding with significant implications for experimental investigations.
{"title":"Comparing the extrinsic orbital Hall effect in centrosymmetric and noncentrosymmetric systems: Insights from bilayer transition metal dichalcogenides","authors":"Azadeh Faridi , Reza Asgari","doi":"10.1016/j.aop.2025.170265","DOIUrl":"10.1016/j.aop.2025.170265","url":null,"abstract":"<div><div>We investigate both intrinsic and extrinsic orbital Hall effects (OHE) in bilayer transition metal dichalcogenides (TMDs) in the presence of short-range disorder using quantum kinetic theory. Bilayer TMDs provide an ideal platform to study the effects of inversion symmetry breaking on transport properties due to their unique structural and electronic characteristics. While bilayer TMDs are naturally inversion symmetric, applying a finite gate voltage to create a bias between the layers effectively breaks this symmetry. Our findings reveal that slightly away from the band edges, the extrinsic OHE eventually becomes the dominant contribution in both inversion-symmetric and asymmetric cases, with its prominence increasing significantly as a function of Fermi energy. Furthermore, we demonstrate that breaking inversion symmetry greatly enhances the extrinsic OHE. This enhancement arises from the fundamentally distinct behavior of orbital angular momentum (OAM) in centrosymmetric systems, where intraband components vanish due to symmetry constraints. As a result, in centrosymmetric systems, only the off-diagonal components of the density matrix contribute to the extrinsic OHE. In contrast, in noncentrosymmetric systems, both diagonal and off-diagonal components play a role. Our study suggests that in experimentally relevant highly doped systems, the OHE becomes predominantly extrinsic in both centrosymmetric and noncentrosymmetric although the contribution is much more pronounced in the latter. Importantly, we infer that even a weakly breaking of inversion symmetry can lead to a dramatic enhancement of the OHE, a finding with significant implications for experimental investigations.</div></div>","PeriodicalId":8249,"journal":{"name":"Annals of Physics","volume":"483 ","pages":"Article 170265"},"PeriodicalIF":3.0,"publicationDate":"2025-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145360161","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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}
Pub Date : 2025-10-20DOI: 10.1016/j.aop.2025.170268
Mohamed Amazioug , Mohammed Daoud
The extraction of work from quantum systems is critical in quantum thermodynamics. In the case of homodyne/heterodyne measurement in de Sitter space (dS), we demonstrate that it is possible to achieve entanglement through extracted work in bi- and tripartite Gaussian states. We show that the entanglement detected by extracted work is in good agreement with that quantified by logarithmic negativity. The results indicate that the influence of de Sitter space curvature results in a distribution of quantum entanglement between modes in different open charts. Particularly, we show that the quantum entanglement of the initially correlated state persists up to infinite curvature.
{"title":"Extracting work as a witness of entanglement in de Sitter spacetime","authors":"Mohamed Amazioug , Mohammed Daoud","doi":"10.1016/j.aop.2025.170268","DOIUrl":"10.1016/j.aop.2025.170268","url":null,"abstract":"<div><div>The extraction of work from quantum systems is critical in quantum thermodynamics. In the case of homodyne/heterodyne measurement in de Sitter space (dS), we demonstrate that it is possible to achieve entanglement through extracted work in bi- and tripartite Gaussian states. We show that the entanglement detected by extracted work is in good agreement with that quantified by logarithmic negativity. The results indicate that the influence of de Sitter space curvature results in a distribution of quantum entanglement between modes in different open charts. Particularly, we show that the quantum entanglement of the initially correlated state persists up to infinite curvature.</div></div>","PeriodicalId":8249,"journal":{"name":"Annals of Physics","volume":"483 ","pages":"Article 170268"},"PeriodicalIF":3.0,"publicationDate":"2025-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145360160","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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}
Pub Date : 2025-10-16DOI: 10.1016/j.aop.2025.170242
Muhamad Ashraf Azman, Siti Najihah Ramlay
This work investigates compact stellar models composed of a mixture of ordinary matter and dark energy within the Tolman IV spacetime, assuming an isotropic matter distribution and a linear equation of state (EoS) for the ordinary matter. The dark energy component is modeled via a negative-pressure fluid obeying , and is confined entirely within the star. We focus on identifying the maximum proportion of DE-like matter that can be tolerated by neutron star data while maintaining physical viability. Using observational constraints, we show that up to approximately 11% of the total energy density may consist of DE-like matter, with ordinary matter remaining dominant across the stellar interior. All resulting configurations satisfy energy conditions, causality, and equilibrium without invoking anisotropic forces or exotic gravity theories. Although we adopt a simplified linear EoS, the model provides a minimal framework to test the astrophysical compatibility of dark energy in compact objects, and suggests that DE-like components can be physically admissible at small fractions in admixed star models.
{"title":"Modeling dark-energy admixed stars in Tolman IV spacetime","authors":"Muhamad Ashraf Azman, Siti Najihah Ramlay","doi":"10.1016/j.aop.2025.170242","DOIUrl":"10.1016/j.aop.2025.170242","url":null,"abstract":"<div><div>This work investigates compact stellar models composed of a mixture of ordinary matter and dark energy within the Tolman IV spacetime, assuming an isotropic matter distribution and a linear equation of state (EoS) for the ordinary matter. The dark energy component is modeled via a negative-pressure fluid obeying <span><math><mrow><msub><mrow><mi>p</mi></mrow><mrow><mi>d</mi><mi>e</mi></mrow></msub><mo>=</mo><mo>−</mo><msub><mrow><mi>ρ</mi></mrow><mrow><mi>d</mi><mi>e</mi></mrow></msub></mrow></math></span>, and is confined entirely within the star. We focus on identifying the maximum proportion of DE-like matter that can be tolerated by neutron star data while maintaining physical viability. Using observational constraints, we show that up to approximately 11% of the total energy density may consist of DE-like matter, with ordinary matter remaining dominant across the stellar interior. All resulting configurations satisfy energy conditions, causality, and equilibrium without invoking anisotropic forces or exotic gravity theories. Although we adopt a simplified linear EoS, the model provides a minimal framework to test the astrophysical compatibility of dark energy in compact objects, and suggests that DE-like components can be physically admissible at small fractions in admixed star models.</div></div>","PeriodicalId":8249,"journal":{"name":"Annals of Physics","volume":"483 ","pages":"Article 170242"},"PeriodicalIF":3.0,"publicationDate":"2025-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145360158","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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}
Pub Date : 2025-10-14DOI: 10.1016/j.aop.2025.170263
A.I. Milstein , I.S. Terekhov
The scattering of a nonrelativistic electron on a narrow solenoid of finite length is considered. In this case, the magnetic field outside the solenoid is not zero. Using the eikonal approximation, the differential and total cross sections of the process are found. It is shown that the total cross section is finite, in contrast to the case of scattering on an infinitely long solenoid (Aharonov-Bohm effect). An asymmetry in the scattering cross section is also found, which can be observed in an experiment.
{"title":"Skew scattering and the Aharonov-Bohm effect","authors":"A.I. Milstein , I.S. Terekhov","doi":"10.1016/j.aop.2025.170263","DOIUrl":"10.1016/j.aop.2025.170263","url":null,"abstract":"<div><div>The scattering of a nonrelativistic electron on a narrow solenoid of finite length is considered. In this case, the magnetic field outside the solenoid is not zero. Using the eikonal approximation, the differential and total cross sections of the process are found. It is shown that the total cross section is finite, in contrast to the case of scattering on an infinitely long solenoid (Aharonov-Bohm effect). An asymmetry in the scattering cross section is also found, which can be observed in an experiment.</div></div>","PeriodicalId":8249,"journal":{"name":"Annals of Physics","volume":"483 ","pages":"Article 170263"},"PeriodicalIF":3.0,"publicationDate":"2025-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145322987","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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}
We argue that Planck-scale fluctuations “planckeons” realize a network of non-traversable Einstein–Rosen bridges and act as holographic devices. Modeling planckeons as wormhole mouths on extremal (RT) surfaces ties spacetime connectivity directly to entanglement. Using the Ryu–Takayanagi framework, we derive an entanglement entropy that governs the thermodynamics of the planckeon ensemble. The resulting partition function exhibits a high-temperature logarithmic entropy consistent with holographic scaling, while at low temperature the network freezes into a sparse remnant-like phase. A characteristic temperature (set by the planckeon gap) separates these regimes; in the noninteracting edge-mode description this marks a crossover (and becomes a genuine phase transition once interactions/pairing are included). Embedding a minimal length in the wormhole throat yields a quantum-corrected Bekenstein entropy in which the area term is supplemented by edge-mode contributions, thereby linking wormhole geometry with quantum-information flow and suggesting a holographic origin of spacetime and black-hole microstructure.
{"title":"Planckeons as mouths of quantum wormholes and holographic origin of spacetime","authors":"Ignazio Licata , Fabrizio Tamburini , Davide Fiscaletti","doi":"10.1016/j.aop.2025.170248","DOIUrl":"10.1016/j.aop.2025.170248","url":null,"abstract":"<div><div>We argue that Planck-scale fluctuations “planckeons” realize a network of non-traversable Einstein–Rosen bridges and act as holographic devices. Modeling planckeons as wormhole mouths on extremal (RT) surfaces ties spacetime connectivity directly to entanglement. Using the Ryu–Takayanagi framework, we derive an entanglement entropy that governs the thermodynamics of the planckeon ensemble. The resulting partition function exhibits a high-temperature logarithmic entropy consistent with holographic scaling, while at low temperature the network freezes into a sparse remnant-like phase. A characteristic temperature <span><math><msub><mrow><mi>T</mi></mrow><mrow><mi>c</mi></mrow></msub></math></span> (set by the planckeon gap) separates these regimes; in the noninteracting edge-mode description this marks a <em>crossover</em> (and becomes a genuine phase transition once interactions/pairing are included). Embedding a minimal length in the wormhole throat yields a quantum-corrected Bekenstein entropy in which the area term is supplemented by edge-mode contributions, thereby linking wormhole geometry with quantum-information flow and suggesting a holographic origin of spacetime and black-hole microstructure.</div></div>","PeriodicalId":8249,"journal":{"name":"Annals of Physics","volume":"483 ","pages":"Article 170248"},"PeriodicalIF":3.0,"publicationDate":"2025-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145323003","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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}
Pub Date : 2025-10-11DOI: 10.1016/j.aop.2025.170247
Jiadu Lin, Qing-Dong Jiang
We study the ponderomotive potential of a bosonic Josephson junction periodically modulated by a high-frequency electromagnetic field. Within the small population difference approximation, the ponderomotive drive induces the well-known Kapitza pendulum effect, stabilizing a -phase mode. We discuss the parameter dependence of the dynamical transition from macroscopic quantum self-trapping to -Josephson oscillations. Furthermore, we examine the situation where the small population difference approximation fails. In this case, an essential momentum-shortening effect emerges, leading to a stabilized -phase mode under certain conditions. By mapping this to a classical pendulum scenario, we highlight the uniqueness and limitations of the -phase mode in bosonic Josephson junctions.
{"title":"Engineering ponderomotive potential for realizing π and π/2 Bosonic Josephson junctions","authors":"Jiadu Lin, Qing-Dong Jiang","doi":"10.1016/j.aop.2025.170247","DOIUrl":"10.1016/j.aop.2025.170247","url":null,"abstract":"<div><div>We study the ponderomotive potential of a bosonic Josephson junction periodically modulated by a high-frequency electromagnetic field. Within the small population difference approximation, the ponderomotive drive induces the well-known Kapitza pendulum effect, stabilizing a <span><math><mi>π</mi></math></span>-phase mode. We discuss the parameter dependence of the dynamical transition from macroscopic quantum self-trapping to <span><math><mi>π</mi></math></span>-Josephson oscillations. Furthermore, we examine the situation where the small population difference approximation fails. In this case, an essential momentum-shortening effect emerges, leading to a stabilized <span><math><mrow><mi>π</mi><mo>/</mo><mn>2</mn></mrow></math></span>-phase mode under certain conditions. By mapping this to a classical pendulum scenario, we highlight the uniqueness and limitations of the <span><math><mrow><mi>π</mi><mo>/</mo><mn>2</mn></mrow></math></span>-phase mode in bosonic Josephson junctions.</div></div>","PeriodicalId":8249,"journal":{"name":"Annals of Physics","volume":"483 ","pages":"Article 170247"},"PeriodicalIF":3.0,"publicationDate":"2025-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145322986","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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}
Pub Date : 2025-10-11DOI: 10.1016/j.aop.2025.170258
J. Aldair Pantoja-González, D. Vanessa Castro-Luna, Alberto Escalante
A detailed Hamilton–Jacobi analysis for linearized gravity is developed. The model is constructed by rewriting linearized gravity in terms of a parameter and new variables. The set of all hamiltonians is identified successfully, and the fundamental differential is established. The non-involutive hamiltonians are eliminated, and the Hamilton–Jacobi generalized brackets are calculated. Such brackets are used to report the characteristic equations, and the counting of the number of degrees of freedom is performed. We fixed the gauge to indicate an intimate closeness between the model under study and linearized gravity.
{"title":"Characteristic equations of linearized λR gravity","authors":"J. Aldair Pantoja-González, D. Vanessa Castro-Luna, Alberto Escalante","doi":"10.1016/j.aop.2025.170258","DOIUrl":"10.1016/j.aop.2025.170258","url":null,"abstract":"<div><div>A detailed Hamilton–Jacobi analysis for linearized <span><math><mrow><mi>λ</mi><mi>R</mi></mrow></math></span> gravity is developed. The model is constructed by rewriting linearized gravity in terms of a parameter <span><math><mi>λ</mi></math></span> and new variables. The set of all hamiltonians is identified successfully, and the fundamental differential is established. The non-involutive hamiltonians are eliminated, and the Hamilton–Jacobi generalized brackets are calculated. Such brackets are used to report the characteristic equations, and the counting of the number of degrees of freedom is performed. We fixed the gauge to indicate an intimate closeness between the model under study and linearized gravity.</div></div>","PeriodicalId":8249,"journal":{"name":"Annals of Physics","volume":"483 ","pages":"Article 170258"},"PeriodicalIF":3.0,"publicationDate":"2025-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145322985","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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}
Pub Date : 2025-10-10DOI: 10.1016/j.aop.2025.170240
Deepak Vaid , Lin Teixeira de Sousa
We propose a modification of the Nambu–Goto action for the bosonic string which is compatible with the existence of a minimum area at the Planck scale. The result is a phenomenological action based on the observation that LQG tells us that areas of two-surfaces are operators in quantum geometry and are bounded from below. This leads us to a string action which is similar to that of bimetric gravity. We provide formulations of the bimetric string action for both the Nambu–Goto (second order) and Polyakov (first order) formulations. We explore the classical solutions of this action and its quantization and relate it to the conventional string solutions.
We further construct a string action in which the effect of the background geometry is described in terms of the pullback of the bulk connection, which encodes the bulk geometry, to the worldsheet. The resulting string action is in the form of a gauged sigma model, where the spacetime co-ordinates are now vectors which transform under the Poincaré group . This requires the introduction of an auxiliary bulk co-ordinate which has a natural interpretation as a holographic or scale direction. We discuss possible cosmological implications of such a large scale emergent dimension.
{"title":"A loop quantum gravity inspired action for the bosonic string and emergent dimensions at large scales","authors":"Deepak Vaid , Lin Teixeira de Sousa","doi":"10.1016/j.aop.2025.170240","DOIUrl":"10.1016/j.aop.2025.170240","url":null,"abstract":"<div><div>We propose a modification of the Nambu–Goto action for the bosonic string which is compatible with the existence of a minimum area at the Planck scale. The result is a phenomenological action based on the observation that LQG tells us that areas of two-surfaces are operators in quantum geometry and are bounded from below. This leads us to a string action which is similar to that of bimetric gravity. We provide formulations of the bimetric string action for both the Nambu–Goto (second order) and Polyakov (first order) formulations. We explore the classical solutions of this action and its quantization and relate it to the conventional string solutions.</div><div>We further construct a string action in which the effect of the background geometry is described in terms of the pullback of the bulk connection, which encodes the bulk geometry, to the worldsheet. The resulting string action is in the form of a gauged sigma model, where the spacetime co-ordinates are now vectors which transform under the Poincaré group <span><math><mrow><mi>I</mi><mi>S</mi><mi>O</mi><mrow><mo>(</mo><mi>D</mi><mo>,</mo><mn>1</mn><mo>)</mo></mrow></mrow></math></span>. This requires the introduction of an auxiliary bulk co-ordinate which has a natural interpretation as a holographic or scale direction. We discuss possible cosmological implications of such a large scale emergent dimension.</div></div>","PeriodicalId":8249,"journal":{"name":"Annals of Physics","volume":"483 ","pages":"Article 170240"},"PeriodicalIF":3.0,"publicationDate":"2025-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145322989","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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}
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