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}
Pub Date : 2025-10-10DOI: 10.1016/j.aop.2025.170245
Ratul Mandal , Ujjal Debnath , Anirudh Pradhan
In theoretical cosmology, symmetric teleparallel gravity or gravity based on nonmetricity tensor has become an interesting alternative to General relativity in recent years. The present research paper contains a rigorous dynamical system analysis of coincident gravity in the presence of a generalized DBI essence scalar field. We have considered two different models of coincident gravity, such as power law model and exponential model respectively, where are constant parameter and is the nonmetricity component. In this study, the generalized DBI essence scalar field acts as an additional dark energy component. After obtaining the field equation for the corresponding cosmological model, we employed several dynamical variables to form the dynamical system. The critical points of these dynamical systems are influenced by cosmological parameters and associated with particular epochs in the cosmological timeline. For different combinations of cosmological parameters, the critical points exhibit different cosmological eras, starting from the accelerated stiff matter era to late-time acceleration phenomena. The stability criteria of each critical point are studied by using linear stability theory, and the physical constraints on the cosmological parameters are also considered during this analysis. Furthermore, the current values of energy densities, deceleration parameters, and equation of state parameters obtained from the evolution diagram are compatible with observational data.
{"title":"Exploring the dynamics of coincident f(Q) gravity in the presence of DBI-essence scalar field","authors":"Ratul Mandal , Ujjal Debnath , Anirudh Pradhan","doi":"10.1016/j.aop.2025.170245","DOIUrl":"10.1016/j.aop.2025.170245","url":null,"abstract":"<div><div>In theoretical cosmology, symmetric teleparallel gravity or <span><math><mrow><mi>f</mi><mrow><mo>(</mo><mi>Q</mi><mo>)</mo></mrow></mrow></math></span> gravity based on nonmetricity tensor <span><math><mi>Q</mi></math></span> has become an interesting alternative to General relativity in recent years. The present research paper contains a rigorous dynamical system analysis of coincident <span><math><mrow><mi>f</mi><mrow><mo>(</mo><mi>Q</mi><mo>)</mo></mrow></mrow></math></span> gravity in the presence of a generalized DBI essence scalar field. We have considered two different models of coincident <span><math><mrow><mi>f</mi><mrow><mo>(</mo><mi>Q</mi><mo>)</mo></mrow></mrow></math></span> gravity, such as power law model <span><math><mrow><mi>f</mi><mrow><mo>(</mo><mi>Q</mi><mo>)</mo></mrow><mo>=</mo><mi>Q</mi><mo>+</mo><mi>n</mi><msup><mrow><mi>Q</mi></mrow><mrow><mi>m</mi></mrow></msup></mrow></math></span> and exponential model <span><math><mrow><mi>f</mi><mrow><mo>(</mo><mi>Q</mi><mo>)</mo></mrow><mo>=</mo><mi>Q</mi><msup><mrow><mi>e</mi></mrow><mrow><mfrac><mrow><mi>β</mi><msub><mrow><mi>Q</mi></mrow><mrow><mn>0</mn></mrow></msub></mrow><mrow><mi>Q</mi></mrow></mfrac></mrow></msup></mrow></math></span> respectively, where <span><math><mrow><mi>n</mi><mo>,</mo><mi>m</mi><mo>,</mo><mi>β</mi></mrow></math></span> are constant parameter and <span><math><mi>Q</mi></math></span> is the nonmetricity component. In this study, the generalized DBI essence scalar field acts as an additional dark energy component. After obtaining the field equation for the corresponding cosmological model, we employed several dynamical variables to form the dynamical system. The critical points of these dynamical systems are influenced by cosmological parameters and associated with particular epochs in the cosmological timeline. For different combinations of cosmological parameters, the critical points exhibit different cosmological eras, starting from the accelerated stiff matter era to late-time acceleration phenomena. The stability criteria of each critical point are studied by using linear stability theory, and the physical constraints on the cosmological parameters are also considered during this analysis. Furthermore, the current values of energy densities, deceleration parameters, and equation of state parameters obtained from the evolution diagram are compatible with observational data.</div></div>","PeriodicalId":8249,"journal":{"name":"Annals of Physics","volume":"483 ","pages":"Article 170245"},"PeriodicalIF":3.0,"publicationDate":"2025-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145322984","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 : 2025-10-08DOI: 10.1016/j.aop.2025.170246
José Weberszpil
We present a comprehensive functional deformation framework for modified gravity, based on an operator that continuously interpolates between a field and its spatial derivative. This approach naturally generates a deformed velocity profile for circular orbits, capable of accurately reproducing galactic rotation curves without invoking dark matter. A variational formulation is constructed, revealing the deformation as a modification of inertia rather than gravity itself. We introduce both standard and hybrid q-deformed profiles that successfully model a range of spiral and dwarf galaxies. The model demonstrates empirical viability for spiral galaxies and theoretical consistency within a geometric-thermodynamic context. The framework provides clear physical interpretation through information theory while maintaining mathematical rigor through variational principles.
{"title":"Functional q-deformation of orbital velocity in emergent gravitation: Extended framework and galactic applications","authors":"José Weberszpil","doi":"10.1016/j.aop.2025.170246","DOIUrl":"10.1016/j.aop.2025.170246","url":null,"abstract":"<div><div>We present a comprehensive functional deformation framework for modified gravity, based on an operator that continuously interpolates between a field and its spatial derivative. This approach naturally generates a deformed velocity profile for circular orbits, capable of accurately reproducing galactic rotation curves without invoking dark matter. A variational formulation is constructed, revealing the deformation as a modification of inertia rather than gravity itself. We introduce both standard and hybrid q-deformed profiles that successfully model a range of spiral and dwarf galaxies. The model demonstrates empirical viability for spiral galaxies and theoretical consistency within a geometric-thermodynamic context. The framework provides clear physical interpretation through information theory while maintaining mathematical rigor through variational principles.</div></div>","PeriodicalId":8249,"journal":{"name":"Annals of Physics","volume":"483 ","pages":"Article 170246"},"PeriodicalIF":3.0,"publicationDate":"2025-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145248006","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 : 2025-10-04DOI: 10.1016/j.aop.2025.170244
Manda Malekpour, Kourosh Nozari
Since the discovery of the Higgs particle in the LHC, numerous inflationary models utilize it as the inflaton. In this study, after establishing that Higgs inflation can be a viable model in the context of unimodular gravity, we address a scenario related to reheating, which plays a crucial role in connecting the inflationary era to a hot Big Bang universe. Also, we calculate essential parameters such as the temperature and the e-folds number according to the equation of the state parameter () in this regime of reheating. The physics behind the reheating process are extremely imprecise at present, and we have only a very limited range of acceptable values for . We analyze the compatibility with Planck2018, BICEP/Keck2021, DESI2024, and ACT array bounds and find that within this model, is restricted to the range .
{"title":"Reheating after the Higgs inflation","authors":"Manda Malekpour, Kourosh Nozari","doi":"10.1016/j.aop.2025.170244","DOIUrl":"10.1016/j.aop.2025.170244","url":null,"abstract":"<div><div>Since the discovery of the Higgs particle in the LHC, numerous inflationary models utilize it as the inflaton. In this study, after establishing that Higgs inflation can be a viable model in the context of unimodular gravity, we address a scenario related to reheating, which plays a crucial role in connecting the inflationary era to a hot Big Bang universe. Also, we calculate essential parameters such as the temperature and the e-folds number according to the equation of the state parameter (<span><math><msub><mrow><mi>ω</mi></mrow><mrow><mi>r</mi><mi>e</mi></mrow></msub></math></span>) in this regime of reheating. The physics behind the reheating process are extremely imprecise at present, and we have only a very limited range of acceptable values for <span><math><msub><mrow><mi>ω</mi></mrow><mrow><mi>r</mi><mi>e</mi></mrow></msub></math></span>. We analyze the compatibility with Planck2018, BICEP/Keck2021, DESI2024, and ACT array bounds and find that within this model, <span><math><msub><mrow><mi>ω</mi></mrow><mrow><mi>r</mi><mi>e</mi></mrow></msub></math></span> is restricted to the range <span><math><mrow><mo>−</mo><mn>1</mn><mo>≤</mo><msub><mrow><mi>ω</mi></mrow><mrow><mi>r</mi><mi>e</mi></mrow></msub><mo>≤</mo><mfrac><mrow><mn>1</mn></mrow><mrow><mn>6</mn></mrow></mfrac></mrow></math></span>.</div></div>","PeriodicalId":8249,"journal":{"name":"Annals of Physics","volume":"482 ","pages":"Article 170244"},"PeriodicalIF":3.0,"publicationDate":"2025-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145262443","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 : 2025-10-04DOI: 10.1016/j.aop.2025.170243
Da-Wei Luo, Ting Yu
Non-Markovian effects in the dynamics of an open system are typically characterized by non-monotonic information flows from the system to its environment or by information backflows from the environment to the system. Using a two-level system (TLS) coupled to a dissipative single-mode cavity, we demonstrate that the geometric decoherence of the open quantum system can serve as a reliable indicator of non-Markovian dynamics. This geometric approach also reveals finer details of the dynamics, such as the specific time points when non-Markovian behavior emerges. In particular, we show that the divergence of the geometric decoherence factor of the TLS can serve as a sufficient condition for non-Markovian dynamics, and in certain cases, it can even be both a necessary and sufficient condition.
{"title":"Geometric signature of non-Markovian dynamics","authors":"Da-Wei Luo, Ting Yu","doi":"10.1016/j.aop.2025.170243","DOIUrl":"10.1016/j.aop.2025.170243","url":null,"abstract":"<div><div>Non-Markovian effects in the dynamics of an open system are typically characterized by non-monotonic information flows from the system to its environment or by information backflows from the environment to the system. Using a two-level system (TLS) coupled to a dissipative single-mode cavity, we demonstrate that the geometric decoherence of the open quantum system can serve as a reliable indicator of non-Markovian dynamics. This geometric approach also reveals finer details of the dynamics, such as the specific time points when non-Markovian behavior emerges. In particular, we show that the divergence of the geometric decoherence factor of the TLS can serve as a sufficient condition for non-Markovian dynamics, and in certain cases, it can even be both a necessary and sufficient condition.</div></div>","PeriodicalId":8249,"journal":{"name":"Annals of Physics","volume":"483 ","pages":"Article 170243"},"PeriodicalIF":3.0,"publicationDate":"2025-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145248007","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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