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Unitary evolution and cosmic acceleration in Loop Quantum Cosmology
IF 4.3 2区 物理与天体物理
Physics Letters B Pub Date : 2025-03-26 DOI: 10.1016/j.physletb.2025.139419
Omar Gallegos , Tonatiuh Matos , Hugo A. Morales-Técotl
{"title":"Unitary evolution and cosmic acceleration in Loop Quantum Cosmology","authors":"Omar Gallegos ,&nbsp;Tonatiuh Matos ,&nbsp;Hugo A. Morales-Técotl","doi":"10.1016/j.physletb.2025.139419","DOIUrl":"10.1016/j.physletb.2025.139419","url":null,"abstract":"<div><div>Loop quantum cosmology was shown to interpolate between de Sitter and FLRW Universe phases through a bounce by including Euclidean and Lorentzian terms of the Hamiltonian constraint with weight one -that corresponding to classical General Relativity. Unitary evolution required self-adjoint extensions of the constraint and a Planckian cosmological constant was obtained. Independent work took a positive weight to get a cosmological constant with the observed value, without considering unitarity. In this work we address the unitary evolution of the model for arbitrary weight. For non positive weight parameter unitary holds but for positive values self-adjoint extensions are required. To encompass observations the extensions here provided are mandatory. These are implemented in a propagator. Finally, we discuss our results and perspectives.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"864 ","pages":"Article 139419"},"PeriodicalIF":4.3,"publicationDate":"2025-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143716344","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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
Addendum to “Herrera complexity and shadows of spherically symmetric compact objects” [Phys. Lett. B 861 (2025) 139261]
IF 4.3 2区 物理与天体物理
Physics Letters B Pub Date : 2025-03-26 DOI: 10.1016/j.physletb.2025.139428
Subhasis Nalui, Subhra Bhattacharya
{"title":"Addendum to “Herrera complexity and shadows of spherically symmetric compact objects” [Phys. Lett. B 861 (2025) 139261]","authors":"Subhasis Nalui,&nbsp;Subhra Bhattacharya","doi":"10.1016/j.physletb.2025.139428","DOIUrl":"10.1016/j.physletb.2025.139428","url":null,"abstract":"<div><div>Omitted citations have been provided.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"864 ","pages":"Article 139428"},"PeriodicalIF":4.3,"publicationDate":"2025-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143716347","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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
Bounce cosmologies in generalized coupling theories
IF 4.3 2区 物理与天体物理
Physics Letters B Pub Date : 2025-03-26 DOI: 10.1016/j.physletb.2025.139426
Antonio Troisi , Sante Carloni
{"title":"Bounce cosmologies in generalized coupling theories","authors":"Antonio Troisi ,&nbsp;Sante Carloni","doi":"10.1016/j.physletb.2025.139426","DOIUrl":"10.1016/j.physletb.2025.139426","url":null,"abstract":"<div><div>We describe an exact solution representing a bouncing cosmology in the Minimal Exponential Measure (MEMe) model. Such a solution, obtained by means of the linearization around small values of the characteristic energy scale <em>q</em> of the theory, has the peculiarity of representing a complete bounce model that can be used to explore quantitative processes in non-singular cosmologies.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"864 ","pages":"Article 139426"},"PeriodicalIF":4.3,"publicationDate":"2025-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143739072","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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
Bayesian method for quantifying the non-Gaussian fluctuations in low-intermediate energy heavy ion collisions
IF 4.3 2区 物理与天体物理
Physics Letters B Pub Date : 2025-03-26 DOI: 10.1016/j.physletb.2025.139427
Xinyu Wang , Xiang Chen , Junping Yang , Ying Cui , Zhuxia Li , Kai Zhao , Yingxun Zhang
{"title":"Bayesian method for quantifying the non-Gaussian fluctuations in low-intermediate energy heavy ion collisions","authors":"Xinyu Wang ,&nbsp;Xiang Chen ,&nbsp;Junping Yang ,&nbsp;Ying Cui ,&nbsp;Zhuxia Li ,&nbsp;Kai Zhao ,&nbsp;Yingxun Zhang","doi":"10.1016/j.physletb.2025.139427","DOIUrl":"10.1016/j.physletb.2025.139427","url":null,"abstract":"<div><div>In this work, we present a model-independent method to quantify the non-Gaussian fluctuations in the observable distributions, which are assessed by the difference between the measured observable distributions and reconstructed observable distributions via the Bayesian method. Our results indicate that the strength of non-Gaussian fluctuation increases with the beam energy, and is primarily driven by non-central collision mechanisms. The experimental measurement of the strength of non-Gaussian fluctuation of the observable distributions will provide valuable insights into understanding the nonequilibrium effects in heavy ion collisions and the liquid-gas phase transition in finite nuclei.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"864 ","pages":"Article 139427"},"PeriodicalIF":4.3,"publicationDate":"2025-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143716342","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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
Observational constraints on entropic cosmology
IF 4.3 2区 物理与天体物理
Physics Letters B Pub Date : 2025-03-25 DOI: 10.1016/j.physletb.2025.139415
Javier Chagoya , I. Díaz-Saldaña , Mario H. Amante , J.C. López-Domínguez , M. Sabido
{"title":"Observational constraints on entropic cosmology","authors":"Javier Chagoya ,&nbsp;I. Díaz-Saldaña ,&nbsp;Mario H. Amante ,&nbsp;J.C. López-Domínguez ,&nbsp;M. Sabido","doi":"10.1016/j.physletb.2025.139415","DOIUrl":"10.1016/j.physletb.2025.139415","url":null,"abstract":"<div><div>In this work, we derive a generalized modified Friedmann equation based on an entropy-area relation that incorporates established modifications, such as volumetric, linear, and logarithmic terms, in addition to novel entropic modifications that might yield to relevant cosmological implications at different stages of the evolution of the Universe. Some of these modifications are capable of mimicking the effects of dark energy and describing the current state of accelerated expansion of the Universe. We study particular cases of the generalized Friedmann equation and constrain the free parameters using observational datasets, including Hubble parameter measurements, baryon acoustic oscillations, and strong lensing systems. Our findings indicate that the proposed models align well with current observational data, particularly in low-redshift regimes; furthermore, these models are compatible with the value of <span><math><msub><mrow><mi>H</mi></mrow><mrow><mn>0</mn></mrow></msub></math></span> obtained by the SH0ES program.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"864 ","pages":"Article 139415"},"PeriodicalIF":4.3,"publicationDate":"2025-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143739037","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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
The charge and magnetic radii of the nucleons from the generalized parton distributions
IF 4.3 2区 物理与天体物理
Physics Letters B Pub Date : 2025-03-25 DOI: 10.1016/j.physletb.2025.139423
{"title":"The charge and magnetic radii of the nucleons from the generalized parton distributions","authors":"","doi":"10.1016/j.physletb.2025.139423","DOIUrl":"10.1016/j.physletb.2025.139423","url":null,"abstract":"<div><div>The proton-radius puzzle refers to the discrepancy observed in measurements of the proton's charge radius when using different methods. This inconsistency has prompted extensive research and debate within the physics community, as it challenges the understanding of quantum electrodynamics and the fundamental properties of protons. In the present study, we determine the charge and magnetic radii of the proton and neutron through a global analysis of the generalized parton distributions (GPDs) at zero skewness. We emphasize the importance of a simultaneous analysis of all available experimental data related to nucleon radii, rather than relying on individual experiments, specific observables, or limited kinematic regions. This comprehensive approach ensures robust and consistent results, avoiding values that are either too small or too large. Our analysis yields the following results: <span><math><msub><mrow><mi>r</mi></mrow><mrow><mi>p</mi><mi>E</mi></mrow></msub><mo>=</mo><mn>0.8558</mn><mo>±</mo><mn>0.0135</mn><mspace></mspace><mtext>fm</mtext></math></span>, <span><math><msub><mrow><mi>r</mi></mrow><mrow><mi>p</mi><mi>M</mi></mrow></msub><mo>=</mo><mn>0.8268</mn><mo>±</mo><mn>0.0533</mn><mspace></mspace><mtext>fm</mtext></math></span>, <span><math><mrow><mo>〈</mo><msubsup><mrow><mi>r</mi></mrow><mrow><mi>n</mi><mi>E</mi></mrow><mrow><mn>2</mn></mrow></msubsup><mo>〉</mo></mrow><mo>=</mo><mo>−</mo><mn>0.1181</mn><mo>±</mo><mn>0.0270</mn><mspace></mspace><msup><mrow><mtext>fm</mtext></mrow><mrow><mn>2</mn></mrow></msup></math></span>, and <span><math><msub><mrow><mi>r</mi></mrow><mrow><mi>n</mi><mi>M</mi></mrow></msub><mo>=</mo><mn>0.8367</mn><mo>±</mo><mn>0.0845</mn><mspace></mspace><mtext>fm</mtext></math></span>.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"864 ","pages":"Article 139423"},"PeriodicalIF":4.3,"publicationDate":"2025-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143716343","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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
Hadronic scattering effects on ψ(2S) suppression in relativistic heavy-ion collisions
IF 4.3 2区 物理与天体物理
Physics Letters B Pub Date : 2025-03-24 DOI: 10.1016/j.physletb.2025.139407
L.M. Abreu , F.S. Navarra , H.P.L. Vieira
{"title":"Hadronic scattering effects on ψ(2S) suppression in relativistic heavy-ion collisions","authors":"L.M. Abreu ,&nbsp;F.S. Navarra ,&nbsp;H.P.L. Vieira","doi":"10.1016/j.physletb.2025.139407","DOIUrl":"10.1016/j.physletb.2025.139407","url":null,"abstract":"<div><div>In this work we estimate the <span><math><msub><mrow><mi>N</mi></mrow><mrow><mi>ψ</mi><mo>(</mo><mn>2</mn><mi>S</mi><mo>)</mo></mrow></msub><mo>/</mo><msub><mrow><mi>N</mi></mrow><mrow><mi>J</mi><mo>/</mo><mi>ψ</mi></mrow></msub></math></span> yield ratio in heavy-ion collisions, considering the interactions of the <span><math><mi>ψ</mi><mo>(</mo><mn>2</mn><mi>S</mi><mo>)</mo></math></span> and <span><math><mi>J</mi><mo>/</mo><mi>ψ</mi></math></span> states with light mesons in the hadron gas formed at the late stages of these collisions. Starting from the appropriate effective Lagrangians, we first compute the thermally-averaged cross sections for the production and absorption of the mentioned states, and then use them as input in the rate equations to determine the time evolution of <span><math><msub><mrow><mi>N</mi></mrow><mrow><mi>ψ</mi><mo>(</mo><mn>2</mn><mi>S</mi><mo>)</mo></mrow></msub></math></span>, <span><math><msub><mrow><mi>N</mi></mrow><mrow><mi>J</mi><mo>/</mo><mi>ψ</mi></mrow></msub></math></span> and <span><math><msub><mrow><mi>N</mi></mrow><mrow><mi>ψ</mi><mo>(</mo><mn>2</mn><mi>S</mi><mo>)</mo></mrow></msub><mo>/</mo><msub><mrow><mi>N</mi></mrow><mrow><mi>J</mi><mo>/</mo><mi>ψ</mi></mrow></msub></math></span>. The main conclusion of our study is that the <span><math><mi>ψ</mi><mo>(</mo><mn>2</mn><mi>S</mi><mo>)</mo></math></span> and <span><math><mi>J</mi><mo>/</mo><mi>ψ</mi></math></span> multiplicities do not change much in the hadron gas phase and that the <span><math><mi>ψ</mi><mo>(</mo><mn>2</mn><mi>S</mi><mo>)</mo></math></span> is more absorbed than the <span><math><mi>J</mi><mo>/</mo><mi>ψ</mi></math></span>. The obtained final ratio is in agreement with recent experimental data.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"864 ","pages":"Article 139407"},"PeriodicalIF":4.3,"publicationDate":"2025-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143696014","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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
Circular orbits and thin accretion disk around a quantum corrected black hole
IF 4.3 2区 物理与天体物理
Physics Letters B Pub Date : 2025-03-24 DOI: 10.1016/j.physletb.2025.139411
Yu-Heng Shu , Jia-Hui Huang
{"title":"Circular orbits and thin accretion disk around a quantum corrected black hole","authors":"Yu-Heng Shu ,&nbsp;Jia-Hui Huang","doi":"10.1016/j.physletb.2025.139411","DOIUrl":"10.1016/j.physletb.2025.139411","url":null,"abstract":"<div><div>In this paper, we first consider the shadow radius of a quantum corrected black hole proposed recently, and provide a bound on the correction parameter <em>ξ</em> based on the observational data of Sgr A*. Then, the effects of the correction parameter on the energy, angular momenta and angular velocities of particles on circular orbits in the accretion disk are discussed. It is found that the correction parameter has significant effects on the angular momenta of particles on the circular orbits even in the far region from the black hole. It would be possible to identify the value of <em>ξ</em> by the observations of the angular momenta of particles in the disk. We also consider the impact of <em>ξ</em> on the radius of the innermost stable circular orbit and the radiative efficiency of the black hole. Then, the radiation properties of the accretion disk around the black hole are studied. The dependence of the observed radiation flux on the polar angle on the observation plane and the observed radiation flux of the direct image of the quantum black hole are illustrated. Finally, we consider how the correction parameter affect the emitted and observed radiation fluxes from a thin accretion disk around the black hole. Polynomial fitting functions are identified for the relations between the maxima of three typical radiation fluxes and the correction parameter.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"864 ","pages":"Article 139411"},"PeriodicalIF":4.3,"publicationDate":"2025-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143696015","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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
Two- versus three-body approach to femtoscopic hadron-deuteron correlations
IF 4.3 2区 物理与天体物理
Physics Letters B Pub Date : 2025-03-22 DOI: 10.1016/j.physletb.2025.139413
Stanisław Mrówczyński
{"title":"Two- versus three-body approach to femtoscopic hadron-deuteron correlations","authors":"Stanisław Mrówczyński","doi":"10.1016/j.physletb.2025.139413","DOIUrl":"10.1016/j.physletb.2025.139413","url":null,"abstract":"<div><div>The three-body approach to hadron-deuteron correlations is shown to turn into a two-body approach if the three-particle hadron-deuteron wave function factorizes into the deuteron wave-function and the wave function of a hadron motion relative to the deuteron. Then, the hadron-deuteron correlation function is as in the two-body approach only the source radius somewhat changes. For this reason, as we argue, the two-body approach works well for kaon-deuteron correlations but it fails for proton-deuteron ones in case of small sources. Applying the three-body approach generalized to the case where the radius of the hadron source is different from the nucleon source radius, we derive the source radius formula which used in the two-body approach gives the correlation function as in the ‘factorized’ three-body one. The formula is discussed in the context of existing and future experimental data.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"864 ","pages":"Article 139413"},"PeriodicalIF":4.3,"publicationDate":"2025-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143687982","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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
Angular analysis of the B0 → K⁎(892)0μ+μ− decay in proton-proton collisions at s=13TeV
IF 4.3 2区 物理与天体物理
Physics Letters B Pub Date : 2025-03-21 DOI: 10.1016/j.physletb.2025.139406
{"title":"Angular analysis of the B0 → K⁎(892)0μ+μ− decay in proton-proton collisions at s=13TeV","authors":"","doi":"10.1016/j.physletb.2025.139406","DOIUrl":"10.1016/j.physletb.2025.139406","url":null,"abstract":"<div><div>A full set of optimized observables is measured in an angular analysis of the decay <span><math><msup><mrow><mi>B</mi></mrow><mrow><mn>0</mn></mrow></msup><mo>→</mo><msup><mrow><mi>K</mi></mrow><mrow><mo>⁎</mo></mrow></msup><msup><mrow><mo>(</mo><mn>892</mn><mo>)</mo></mrow><mrow><mn>0</mn></mrow></msup><msup><mrow><mi>μ</mi></mrow><mrow><mo>+</mo></mrow></msup><msup><mrow><mi>μ</mi></mrow><mrow><mo>−</mo></mrow></msup></math></span> using a sample of proton-proton collisions at <span><math><msqrt><mrow><mi>s</mi></mrow></msqrt><mo>=</mo><mn>13</mn><mspace></mspace><mtext>TeV</mtext></math></span>, collected with the CMS detector at the LHC, corresponding to an integrated luminosity of 140<!--> <span><math><msup><mrow><mtext>fb</mtext></mrow><mrow><mo>−</mo><mn>1</mn></mrow></msup></math></span>. The analysis is performed in six bins of the squared invariant mass of the dimuon system, <span><math><msup><mrow><mi>q</mi></mrow><mrow><mn>2</mn></mrow></msup></math></span>, over the range <span><math><mn>1.1</mn><mo>&lt;</mo><msup><mrow><mi>q</mi></mrow><mrow><mn>2</mn></mrow></msup><mo>&lt;</mo><mn>16</mn><mspace></mspace><msup><mrow><mtext>GeV</mtext></mrow><mrow><mn>2</mn></mrow></msup></math></span>. The results are among the most precise experimental measurements of the angular observables for this decay and are compared to a variety of predictions based on the standard model. Some of these predictions exhibit tension with the measurements.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"864 ","pages":"Article 139406"},"PeriodicalIF":4.3,"publicationDate":"2025-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143716341","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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
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