Nuclear Physics B最新文献

英文中文

Magnetic suppression of cosmic rays' flux in f(R) and f(Q) theories of gravity

IF 2.5 3区物理与天体物理 Q2 PHYSICS, PARTICLES & FIELDS

Nuclear Physics B

Pub Date : 2025-02-27 DOI: 10.1016/j.nuclphysb.2025.116851

Swaraj Pratim Sarmah, Umananda Dev Goswami

We investigate the effects of magnetic diffusion on the spectrum of ultra-high energy cosmic rays (UHECRs) from a cosmological perspective. To this end, we consider two modified theories of gravity (MTGs), namely, the

f (R)

gravity and a symmetric teleparallel gravity, also known as

f (Q)

gravity. Utilizing these two MTGs, we calculate the suppression in the flux of UHECRs for a collection of sources. Non-evolution (NE) and cosmic star formation rate (SFR) scenarios have been considered in our calculation of the suppression factor. This study also includes a mixed composition scenario involving the nuclei upto iron (Fe). Furthermore, we provide a parameterization of the suppression factor for the proton and also for the mixed compositions within the

f (R)

and

f (Q)

theories, considering both NE and SFR scenarios. The influence of the turbulent magnetic field on the suppression factor is also incorporated in our work. Comparative analysis of all our results with the standard ΛCDM model reveals significant effects of MTGs on the suppression factor that the

f (R)

power-law model predicts the lowest suppression factor, while the

f (Q)

model predicts the highest, and interestingly the results from the standard model fall within the range predicted by these two cosmological models.

{"title":"Magnetic suppression of cosmic rays' flux in f(R) and f(Q) theories of gravity","authors":"Swaraj Pratim Sarmah, Umananda Dev Goswami","doi":"10.1016/j.nuclphysb.2025.116851","DOIUrl":"10.1016/j.nuclphysb.2025.116851","url":null,"abstract":"<div><div>We investigate the effects of magnetic diffusion on the spectrum of ultra-high energy cosmic rays (UHECRs) from a cosmological perspective. To this end, we consider two modified theories of gravity (MTGs), namely, the <span><math><mi>f</mi><mo>(</mo><mi>R</mi><mo>)</mo></math></span> gravity and a symmetric teleparallel gravity, also known as <span><math><mi>f</mi><mo>(</mo><mi>Q</mi><mo>)</mo></math></span> gravity. Utilizing these two MTGs, we calculate the suppression in the flux of UHECRs for a collection of sources. Non-evolution (NE) and cosmic star formation rate (SFR) scenarios have been considered in our calculation of the suppression factor. This study also includes a mixed composition scenario involving the nuclei upto iron (Fe). Furthermore, we provide a parameterization of the suppression factor for the proton and also for the mixed compositions within the <span><math><mi>f</mi><mo>(</mo><mi>R</mi><mo>)</mo></math></span> and <span><math><mi>f</mi><mo>(</mo><mi>Q</mi><mo>)</mo></math></span> theories, considering both NE and SFR scenarios. The influence of the turbulent magnetic field on the suppression factor is also incorporated in our work. Comparative analysis of all our results with the standard ΛCDM model reveals significant effects of MTGs on the suppression factor that the <span><math><mi>f</mi><mo>(</mo><mi>R</mi><mo>)</mo></math></span> power-law model predicts the lowest suppression factor, while the <span><math><mi>f</mi><mo>(</mo><mi>Q</mi><mo>)</mo></math></span> model predicts the highest, and interestingly the results from the standard model fall within the range predicted by these two cosmological models.</div></div>","PeriodicalId":54712,"journal":{"name":"Nuclear Physics B","volume":"1013 ","pages":"Article 116851"},"PeriodicalIF":2.5,"publicationDate":"2025-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143519973","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}

引用次数: 0

Bouncing cosmology and the dynamical stability analysis in f(R,Lm)-gravity

IF 2.5 3区物理与天体物理 Q2 PHYSICS, PARTICLES & FIELDS

Nuclear Physics B

Pub Date : 2025-02-27 DOI: 10.1016/j.nuclphysb.2025.116854

Shaily , J.K. Singh , Dimple Sethi , Rita Rani , Kazuharu Bamba

We study the bouncing cosmology in the

f (R, L_{m})

theory of gravity. In this model, we consider a specific function of

f (R, L_{m})

which contains the higher order curvature term along with the matter Lagrangian. Here, we parameterize the Hubble parameter with the motivation that it creates a model with bouncing behavior and solves the initial singularity problem during the universe's early evolution. This model achieves a bounce instead, where the universe rapidly contracts and then quickly expands again. The EoS parameter crosses the quintom line in the vicinity of the bouncing position indicating significant changes in the energy density, isotropic pressure, and temperature in the model. The model is highly unstable near the bouncing point. Finally, we analyze the model's dynamic stability in the neighborhood of the bouncing point by examining the sound velocity and the adiabatic index depictions.

{"title":"Bouncing cosmology and the dynamical stability analysis in f(R,Lm)-gravity","authors":"Shaily , J.K. Singh , Dimple Sethi , Rita Rani , Kazuharu Bamba","doi":"10.1016/j.nuclphysb.2025.116854","DOIUrl":"10.1016/j.nuclphysb.2025.116854","url":null,"abstract":"<div><div>We study the bouncing cosmology in the <span><math><mi>f</mi><mo>(</mo><mi>R</mi><mo>,</mo><msub><mrow><mi>L</mi></mrow><mrow><mi>m</mi></mrow></msub><mo>)</mo></math></span> theory of gravity. In this model, we consider a specific function of <span><math><mi>f</mi><mo>(</mo><mi>R</mi><mo>,</mo><msub><mrow><mi>L</mi></mrow><mrow><mi>m</mi></mrow></msub><mo>)</mo></math></span> which contains the higher order curvature term along with the matter Lagrangian. Here, we parameterize the Hubble parameter with the motivation that it creates a model with bouncing behavior and solves the initial singularity problem during the universe's early evolution. This model achieves a bounce instead, where the universe rapidly contracts and then quickly expands again. The EoS parameter crosses the quintom line in the vicinity of the bouncing position indicating significant changes in the energy density, isotropic pressure, and temperature in the model. The model is highly unstable near the bouncing point. Finally, we analyze the model's dynamic stability in the neighborhood of the bouncing point by examining the sound velocity and the adiabatic index depictions.</div></div>","PeriodicalId":54712,"journal":{"name":"Nuclear Physics B","volume":"1013 ","pages":"Article 116854"},"PeriodicalIF":2.5,"publicationDate":"2025-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143534378","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}

引用次数: 0

Emergent large flavor mixing from canonical and inverse seesaws?

IF 2.5 3区物理与天体物理 Q2 PHYSICS, PARTICLES & FIELDS

Nuclear Physics B

Pub Date : 2025-02-26 DOI: 10.1016/j.nuclphysb.2025.116853

Zhi-zhong Xing

While the canonical seesaw mechanism provides a most natural qualitative interpretation of tiny masses for the three active neutrinos, it offers no explanation for their large flavor mixing effects. The latter can be regarded as an emergent consequence of this mechanism, in which case we are left with an intriguing cross seesaw framework in the mass basis of all the six Majorana neutrinos. To lower the mass scales of heavy neutrinos, one is motivated to invoke the inverse seesaw mechanism but has to pay the price for a fine-tuned cancellation between its two sets of new degrees of freedom, in which case the largeness of active flavor mixing is an emergent phenomenon as well. A comparison between the approximate seesaw relations in the flavor basis and those exact ones in the mass basis is also made.

引用次数: 0

Z and Higgs boson decays with doubly-charged scalars at one-loop: Current constraints, future sensitivities, and application to lepton-triality models

IF 2.5 3区物理与天体物理 Q2 PHYSICS, PARTICLES & FIELDS

Nuclear Physics B

Pub Date : 2025-02-25 DOI: 10.1016/j.nuclphysb.2025.116850

Gabriela Lichtenstein , Michael A. Schmidt , German Valencia , Raymond R. Volkas

We analyse the Z and Higgs boson decays

Z \to ℓ^{+} ℓ^{-}

(

ℓ = e, μ, τ

H \to γ γ

and

H \to Z γ

that are induced at one-loop level in models with a doubly-charged isosinglet scalar. After discussing current constraints, we derive the parameter space that will be probed by the HL-LHC and the possible future colliders the ILC, CEPC and FCC. We then apply those constraints to lepton triality models which are based on a discrete

Z_{3}

family symmetry and were recently studied in the context of charged-lepton flavour-violating processes at Belle II and the proposed

μ^{+} μ^{+}

and

μ^{+} e^{-}

collider known as μTRISTAN. We find that the future constraints that can be imposed by

Z \to ℓ^{+} ℓ^{-}

on the lepton flavour conserving couplings of the triality models reduce the viable parameter space to probe lepton flavour violating processes. The constraints from Higgs boson decays are the first on the Higgs portal sector of the triality models.

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引用次数: 0

Interpretation of complexity for spherically symmetric fluid composition within the context of modified gravity theory

IF 2.5 3区物理与天体物理 Q2 PHYSICS, PARTICLES & FIELDS

Nuclear Physics B

Pub Date : 2025-02-25 DOI: 10.1016/j.nuclphysb.2025.116852

A. Rehman , Tayyab Naseer , Baiju Dayanandan

Regardless of the adequate descriptions of complexity in distinct alternative gravity theories, its elaboration in the framework of

f (R, L_{m}, T)

theory remains uncertain. The orthogonal splitting of the curvature tensor yields the complexity factor as suggested by Herrera [1]. To commence our study, the inner spacetime is assumed to be spherically symmetric static composition comprised of the anisotropic fluid. In this context, we derive the modified field equations for the considered theory and take into account the established relationship between the conformal and curvature tensors to interpret the complexity. Furthermore, we determine the correspondence of the mass functions with the complexity factor, represented by a specific scalar

Y_{T F}

. Certain solutions complying with the precedent of diminishing

Y_{T F}

are also evaluated. It is noted that celestial formations having anisotropic and non-uniform compositions of matter assert the utmost complexity. Nevertheless, the spherically symmetric matter distribution may not exhibit complexity in the scenario of vanishing impacts of non-homogenous energy density and anisotropic pressure due to the presence of dark source terms associated with this extended gravity theory.

{"title":"Interpretation of complexity for spherically symmetric fluid composition within the context of modified gravity theory","authors":"A. Rehman , Tayyab Naseer , Baiju Dayanandan","doi":"10.1016/j.nuclphysb.2025.116852","DOIUrl":"10.1016/j.nuclphysb.2025.116852","url":null,"abstract":"<div><div>Regardless of the adequate descriptions of complexity in distinct alternative gravity theories, its elaboration in the framework of <span><math><mi>f</mi><mo>(</mo><mi>R</mi><mo>,</mo><msub><mrow><mi>L</mi></mrow><mrow><mi>m</mi></mrow></msub><mo>,</mo><mi>T</mi><mo>)</mo></math></span> theory remains uncertain. The orthogonal splitting of the curvature tensor yields the complexity factor as suggested by Herrera <span><span>[1]</span></span>. To commence our study, the inner spacetime is assumed to be spherically symmetric static composition comprised of the anisotropic fluid. In this context, we derive the modified field equations for the considered theory and take into account the established relationship between the conformal and curvature tensors to interpret the complexity. Furthermore, we determine the correspondence of the mass functions with the complexity factor, represented by a specific scalar <span><math><msub><mrow><mi>Y</mi></mrow><mrow><mi>T</mi><mi>F</mi></mrow></msub></math></span>. Certain solutions complying with the precedent of diminishing <span><math><msub><mrow><mi>Y</mi></mrow><mrow><mi>T</mi><mi>F</mi></mrow></msub></math></span> are also evaluated. It is noted that celestial formations having anisotropic and non-uniform compositions of matter assert the utmost complexity. Nevertheless, the spherically symmetric matter distribution may not exhibit complexity in the scenario of vanishing impacts of non-homogenous energy density and anisotropic pressure due to the presence of dark source terms associated with this extended gravity theory.</div></div>","PeriodicalId":54712,"journal":{"name":"Nuclear Physics B","volume":"1013 ","pages":"Article 116852"},"PeriodicalIF":2.5,"publicationDate":"2025-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143508811","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}

引用次数: 0

Padé approximated traversable wormholes in f(R,T) gravity

IF 2.5 3区物理与天体物理 Q2 PHYSICS, PARTICLES & FIELDS

Nuclear Physics B

Pub Date : 2025-02-20 DOI: 10.1016/j.nuclphysb.2025.116838

Abdul Malik Sultan , Aliya Batool , G. Abbas , Abdul Jawad , Sanjar Shaymatov

In this paper, we center our attention on exploring wormhole solutions within

f (R, T)

gravity theory, with R symbolizing the curvature in scalar form and T denoting trace of stress-energy tensor associated with matter. With the intention of probing this, we assess a geometric setup characterized by static spherically symmetric conditions featuring anisotropic matter distributions. A distinctive shape function, which utilizes the Padé approximation, is adopted to ensure compliance with constraints. Incorporating the

f (R) = α R^{m} - β R^{n}

model, we assess the behavior of energy conditions. Moreover, we provided a graphical analysis for all energy conditions, presenting the examination of physically feasible wormhole geometries by highlighting the valid regions associated with each condition. A diagram illustrating the potential traversable wormhole is depicted through embedding. Moreover, we have analyzed the equilibrium state of our system by employing the Tolman-Oppenheimer-Volkoff equation. It is inferred that viable traversable wormholes may potentially exist within this framework.

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引用次数: 0

Embedding integrable spin models in solvable vertex models on the square lattice

IF 2.5 3区物理与天体物理 Q2 PHYSICS, PARTICLES & FIELDS

Nuclear Physics B

Pub Date : 2025-02-20 DOI: 10.1016/j.nuclphysb.2025.116849

M.J. Martins

Exploring a mapping among n-state spin and vertex models on the square lattice, we argue that a given integrable spin model with edge weights satisfying the rapidity difference property can be formulated in the framework of an equivalent solvable vertex model. The Lax operator and the R-matrix associated to the vertex model are built in terms of the edge weights of the spin model and these operators are shown to satisfy the Yang-Baxter algebra. The unitarity of the R-matrix follows from an assumption that the vertical edge weights of the spin model satisfy certain local identities known as inversion relation. We apply this embedding to the scalar n-state Potts model and we argue that the corresponding R-matrix can be written in terms of the underlying Temperley-Lieb operators. We also consider our construction for the integrable Ashkin-Teller model and the respective R-matrix is expressed in terms of sixteen distinct weights parametrized by theta functions. We comment on the possible extension of our results to spin models whose edge weights are not expressible in terms of the difference of spectral parameters.

{"title":"Embedding integrable spin models in solvable vertex models on the square lattice","authors":"M.J. Martins","doi":"10.1016/j.nuclphysb.2025.116849","DOIUrl":"10.1016/j.nuclphysb.2025.116849","url":null,"abstract":"<div><div>Exploring a mapping among <em>n</em>-state spin and vertex models on the square lattice, we argue that a given integrable spin model with edge weights satisfying the rapidity difference property can be formulated in the framework of an equivalent solvable vertex model. The Lax operator and the R-matrix associated to the vertex model are built in terms of the edge weights of the spin model and these operators are shown to satisfy the Yang-Baxter algebra. The unitarity of the R-matrix follows from an assumption that the vertical edge weights of the spin model satisfy certain local identities known as inversion relation. We apply this embedding to the scalar <em>n</em>-state Potts model and we argue that the corresponding R-matrix can be written in terms of the underlying Temperley-Lieb operators. We also consider our construction for the integrable Ashkin-Teller model and the respective R-matrix is expressed in terms of sixteen distinct weights parametrized by theta functions. We comment on the possible extension of our results to spin models whose edge weights are not expressible in terms of the difference of spectral parameters.</div></div>","PeriodicalId":54712,"journal":{"name":"Nuclear Physics B","volume":"1013 ","pages":"Article 116849"},"PeriodicalIF":2.5,"publicationDate":"2025-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143480633","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}

引用次数: 0

Universality in the quantum nature of spacetime in Wheeler-DeWitt black holes

IF 2.5 3区物理与天体物理 Q2 PHYSICS, PARTICLES & FIELDS

Nuclear Physics B

Pub Date : 2025-02-19 DOI: 10.1016/j.nuclphysb.2025.116848

Harpreet Singh, Malay K. Nandy

The essential singularity in the interior spacetime of a black hole occurs as a vacuum solution of the Einstein field equation. This singularity emerges as a result of treating the spacetime classically, and it can be resolved upon treating the spacetime quantum mechanically with simple metric ansatzes. This leads to the obvious question: Is the singularity resolution a universal feature with respect to arbitrariness of the metric ansatz? In this paper, we address this question by representing the black hole interior with a generalized Kantowski-Sachs metric characterized by two inbuilt arbitrary parameters, in addition to including a Klein-Gordon field. We quantize this system and solve the resulting Wheeler-DeWitt equation exactly to obtain a general form of the wave function in the black hole interior. Upon analyzing this wave function in light of the DeWitt boundary condition, three types of solutions emerge exhibiting universal behavior in the vicinity of the singularity with respect to the arbitrary metric parameters. In two of those types of solutions, regular quantum black holes would always occur as a universal feature. Within the same context, the third type of solutions, having no regular quantum black holes, must also occur as another universal feature. Importantly, these wave functions are found to carry clear imprints of the arbitrary metric parameters, discernible prominently upon moving away from the singularity, and their near-singularity behaviors remain universal with respect to the arbitrariness in the metric ansatz. This is an emergent new feature of quantum gravity irrespective of how the metric ansatz is made. Furthermore, we show how the regularity conditions for the expectation values of the Kretschmann operator, as well as other relevant operators, carry imprints of the arbitrary metric parameters.

{"title":"Universality in the quantum nature of spacetime in Wheeler-DeWitt black holes","authors":"Harpreet Singh, Malay K. Nandy","doi":"10.1016/j.nuclphysb.2025.116848","DOIUrl":"10.1016/j.nuclphysb.2025.116848","url":null,"abstract":"<div><div>The essential singularity in the interior spacetime of a black hole occurs as a vacuum solution of the Einstein field equation. This singularity emerges as a result of treating the spacetime classically, and it can be resolved upon treating the spacetime quantum mechanically with simple metric ansatzes. This leads to the obvious question: Is the singularity resolution a universal feature with respect to arbitrariness of the metric ansatz? In this paper, we address this question by representing the black hole interior with a generalized Kantowski-Sachs metric characterized by two inbuilt arbitrary parameters, in addition to including a Klein-Gordon field. We quantize this system and solve the resulting Wheeler-DeWitt equation exactly to obtain a general form of the wave function in the black hole interior. Upon analyzing this wave function in light of the DeWitt boundary condition, three types of solutions emerge exhibiting universal behavior in the vicinity of the singularity with respect to the arbitrary metric parameters. In two of those types of solutions, regular quantum black holes would always occur as a universal feature. Within the same context, the third type of solutions, having no regular quantum black holes, must also occur as another universal feature. Importantly, these wave functions are found to carry clear imprints of the arbitrary metric parameters, discernible prominently upon moving away from the singularity, and their near-singularity behaviors remain universal with respect to the arbitrariness in the metric ansatz. This is an emergent new feature of quantum gravity irrespective of how the metric ansatz is made. Furthermore, we show how the regularity conditions for the expectation values of the Kretschmann operator, as well as other relevant operators, carry imprints of the arbitrary metric parameters.</div></div>","PeriodicalId":54712,"journal":{"name":"Nuclear Physics B","volume":"1013 ","pages":"Article 116848"},"PeriodicalIF":2.5,"publicationDate":"2025-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143454986","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}

引用次数: 0

Functional BRST-invariant approach to the Siegel-Zwiebach symmetric rank-two tensor action in the critical dimension – massive gravity clues from string theory

IF 2.5 3区物理与天体物理 Q2 PHYSICS, PARTICLES & FIELDS

Nuclear Physics B

Pub Date : 2025-02-19 DOI: 10.1016/j.nuclphysb.2025.116845

Vipul Kumar Pandey , Ronaldo Thibes

We discuss the rank-two tensorial Siegel-Zwiebach action from string field theory within a BRST-invariant functional framework in the bosonic critical dimension. We obtain a new family of generalized proper gauge-fixing conditions. Gauge attainability and all corresponding nillpotent BRST symmetries are explicitly worked out. Finite-field-dependent BRST transformations (FFBRST) are shown to connect the effective ghost-dependent actions in different gauges. The massive Fierz-Pauli Lagrangian can be obtained from the gauge-invariant Siegel-Zwiebach one in the unitary gauge as a particular case, however, due to the well-known van Dam-Veltman-Zakharov (vDVZ) discontinuity, possessing a ill-defined propagator in the massless limit. Nevertheless, alternatively working in a more suitable generalized Lorenz type gauge, including the transverse-traceless case, the graviton propagator within the Siegel-Zwiebach Lagrangian context can be made finite in the massless limit. We write down the complete Green's functions generating functional, including the auxiliary fields and ghosts sectors. By taking into account the corresponding change in the Feynman integral Jacobian, we construct a convenient FFBRST transformation connecting the unitary gauge to a new bi-parametrized class of gauge-fixings containing the transverse-traceless case.

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Softly broken hidden symmetry in every renormalizable field theory

IF 2.5 3区物理与天体物理 Q2 PHYSICS, PARTICLES & FIELDS

Nuclear Physics B

Pub Date : 2025-02-18 DOI: 10.1016/j.nuclphysb.2025.116847

Ernest Ma

It is pointed out that every renomalizable field theory has a symmetry which is hidden in plain sight. In all practical cases, it is also broken softly, either explicitly or spontaneously. The soft explicit breaking mass terms may be assumed naturally small compared to the scalar mass-squared terms. Implications for extensions of the standard model are discussed. New left-right model of two-loop radiative Dirac neutrino mass is proposed.

引用次数: 0

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