The European Physical Journal C最新文献

{"title":"Traversable wormholes in constant curvature black holes","authors":"Ankit Anand,&nbsp;Ruben Campos Delgado,&nbsp;Daris Samart","doi":"10.1140/epjc/s10052-025-14038-8","DOIUrl":"10.1140/epjc/s10052-025-14038-8","url":null,"abstract":"<div><p>This paper investigates the massive gauge field within spacetime context from a <span>(mathbb {Z}_2)</span> quotient of the constant curvature black hole. We investigate how the matter field’s back reaction affects the spacetime geometry, considering perturbations in the metric up to the first order. The stress-energy tensor’s expectation value can be precisely calculated by evaluating its pull-back onto the covering space. By appropriately selecting boundary conditions for the massive vector field along a non-contractible cycle of the quotient manifold, achieving a negative average energy along a null geodesic becomes feasible, enabling a traversable wormhole.\u0000</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 3","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-14038-8.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143716824","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}

{"title":"The spectroscopy of Kerr–Einstein–Maxwell-dilaton-axion: exact quasibound states, scalar cloud, horizon’s Boson statistics and superradiant","authors":"David Senjaya,&nbsp;Supakchai Ponglertsakul","doi":"10.1140/epjc/s10052-025-14014-2","DOIUrl":"10.1140/epjc/s10052-025-14014-2","url":null,"abstract":"<div><p>In the present study, we investigate the quasibound states, scalar cloud and superradiant of relativistic scalar fields bound to a rotating black hole in Kerr–Einstein–Maxwell-dilaton-axion theory (Kerr-EMDA). We present the exact eigensolutions of the governing Klein–Gordon equation in the black hole background. By imposing boundary conditions on the quasibound states, we are able to find the exact complex quasibound state frequencies of the corresponding radial wave functions in terms of the confluent Heun polynomial. Considering the light scalar field limit of the obtained solution, we investigate the scalar–black hole resonance configuration known as the scalar cloud. In addition, we obtain an analytical relationship between the light scalar mass and black hole spin for the scalar cloud. We explore a boson distribution function by linearly expanding the radial wave function near the black hole’s event horizon. Moreover, by applying the Damour–Ruffini method, we are able to calculate the Hawking radiation flux. In the final section, we consider a propagating wave in a slowly rotating Kerr-EMDA black hole for bosons with a much larger Compton wavelength than the size of the rotating black hole. This condition allows us to use asymptotic matching to calculate the amplification factor for scalar fields in the Kerr-EMDA black hole. We present the dependence of the amplification factor on the black hole parameters by graphical analysis.\u0000</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 3","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-14014-2.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143716815","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}

{"title":"Gluon Wigner distributions in a light-cone spectator model","authors":"Chentao Tan,&nbsp;Zhun Lu","doi":"10.1140/epjc/s10052-025-14054-8","DOIUrl":"10.1140/epjc/s10052-025-14054-8","url":null,"abstract":"<div><p>We study the gluon Wigner distributions of the proton which are the phase-space distributions containing the most general one-parton information. Using the proton wave functions deduced from a light-cone spectator model that contains the gluonic degree of freedom, we calculate the Wigner distributions of the unpolarized and longitudinally polarized gluon inside the unpolarized/longitudinally polarized proton via the Fock-state overlap representation, respectively. We present the numerical results of the transverse Wigner distributions in which the longitudinal momentum fraction is integrated out. We also provide the gluon orbital angular momentum and spin-orbit correlations deduced from the gluon Wigner distribution.\u0000</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 3","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-14054-8.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143726740","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}

{"title":"The Fierz–Pauli theory on curved spacetime at one-loop and its counterterms","authors":"Leonardo Farolfi,&nbsp;Filippo Fecit","doi":"10.1140/epjc/s10052-025-14083-3","DOIUrl":"10.1140/epjc/s10052-025-14083-3","url":null,"abstract":"<div><p>We compute the first four heat-kernel coefficients required for the renormalization of Linearized Massive Gravity. We focus on the Fierz–Pauli theory in a curved spacetime, describing the propagation of a massive spin 2 field in a non-flat background. The background must be on-shell, i.e. must be an Einstein space, in order to ensure a consistent extension of the Fierz–Pauli theory beyond Minkowski space. Starting from the Stückelberg formulation with restored gauge invariance, we apply suitable gauge-fixing procedures to simplify the complicated non-minimal kinetic operators of the scalar, vector, and tensor sectors of the theory, reducing them into manageable minimal forms. Using standard techniques, we then compute the Seeley–DeWitt coefficients, with particular emphasis on the fourth coefficient, <span>(a_3(D))</span>, in arbitrary spacetime dimensions. This result constitutes our main contribution, as it has not been previously reported in full generality in the literature.\u0000</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 3","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-14083-3.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143726741","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}

{"title":"Investigating the role of new physics in semileptonic (varUpsilon (nS) rightarrow B_c l^-{bar{nu }}_{l} ) weak decays","authors":"Jin-Huan Sheng,&nbsp;Feng-Zi Zhou,&nbsp;Yuan-Yuan Li,&nbsp;Yuan-Guo Xu","doi":"10.1140/epjc/s10052-025-14044-w","DOIUrl":"10.1140/epjc/s10052-025-14044-w","url":null,"abstract":"<div><p>Recently, the excess in the measurement of the branching fractions of <span>({bar{B}} rightarrow D^{(*)} tau ^- {bar{nu }}_{tau })</span> and <span>(B_c rightarrow J/varPsi tau ^-{bar{nu }}_{tau })</span> compared to the standard model expectation hints the existence of new physics beyond the standard model. Motivated by these inspiring anomalies, which may imply hints of new physics, as well as abundant <span>(varUpsilon (nS))</span> data samples, in this work, we perform the analysis of the semileptonic decays <span>(varUpsilon (nS) rightarrow B_c l^- bar{nu _{l}}(n=1,2,3))</span>, which is also induced by <span>( b rightarrow c l^- bar{nu _{l}})</span> transitions at the quark level, both within the standard model and beyond. Starting with the most general effective Hamiltonian relevant for the <span>(b rightarrow c l^-bar{nu _{l}})</span> transition, we report the prediction of standard model for various observables, such as branching ratios, the ratio of branching fractions, the lepton side forward-backward asymmetries, the initial hadron and final lepton longitudinal polarization asymmetries and the convexity parameter, as well as for some new observable that is similar to lepton non-universality, <span>(R_{B_c}(q^2))</span>, which is related to the processes <span>(varUpsilon (nS) rightarrow B_c l^- bar{nu _{l}}(n=1,2,3))</span>. These predictions are made using transition form factors which are calculated in the Bauer Stech Wirbel framework. Using previously obtained significant fits of the new physics couplings, predictions for the <span>(q^2)</span> dependence of different observable within various new physics scenarios are also presented. Some observable of the decay modes are sizeable and deviate significantly from their corresponding prediction of the standard model, especially in new physics scenarios with <span>(S_R)</span> coupling parameter. We hope that the corresponding investigation in this work will be testified by future experiments. Additionally, the study of the meson decays will also enhance the study of b hadron decay processes, as they provide good complementary environment for searching new physics signal. \u0000</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 3","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-14044-w.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143706980","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}

{"title":"AdS Ellis wormholes with scalar field","authors":"Chen-Hao Hao,&nbsp;Xin Su,&nbsp;Yong-Qiang Wang","doi":"10.1140/epjc/s10052-025-13937-0","DOIUrl":"10.1140/epjc/s10052-025-13937-0","url":null,"abstract":"<div><p>In this paper, we study the spherically symmetric traversable wormholes supported by a phantom field in the anti-de Sitter (AdS) asymptotic spacetime. We couple an additional complex scalar field into this wormhole spacetime and study the physical properties of this model. Despite coupling the scalar matter field, these wormholes remain massless and symmetric for reflection of the radial coordinate <span>(r rightarrow -r.)</span> The solution possesses a finite Noether charge <i>Q</i>,  which varies as a function of frequency <span>(omega )</span> with changes in the cosmological constant <span>(Lambda )</span> and the throat size <span>(r_0.)</span> Under specific conditions, an approximate “event horizon” will appear at the throat.</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 3","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-13937-0.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143706978","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}

{"title":"Hydrodynamical properties of baryon rich thermal plasma with flavour quarks","authors":"Rishi Pokhrel,&nbsp;Tanay K. Dey","doi":"10.1140/epjc/s10052-025-14039-7","DOIUrl":"10.1140/epjc/s10052-025-14039-7","url":null,"abstract":"<div><p>In this work, we holographically study the hydrodynamical properties of <span>(mathcal {N} = 4)</span> strongly coupled Super Yang–Mills baryon rich thermal plasma with large number of flavour quarks. Specifically, we study the drag force acting on the moving heavy probe quark and corresponding energy loss. We also study the jet quenching parameter, screening length and binding energy of the quark–antiquark pair. Due to the presence of finite baryon density and flavour quarks the drag force, energy loss, jet quenching parameter and binding energy of the quark–antiquark pair are enhanced for the increase in temperature. However, the screening length of the quark–antiquark pair is reduced, leading to the thermal plasma phase being achieved at a lower temperature, which is consistent with the thermal phase diagram of the quark–gluon plasma. We observed that the perpendicular orientation of quark–antiquark pair with respect to the direction of motion deconfined early compare to the parallel orientation once temperature raises.\u0000</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 3","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-14039-7.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143706977","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}

{"title":"Erratum: Nonstatic Reissner–Nordström metric in the perturbative f(R) theory: embedding in the background of the FLRW cosmology, uniqueness of solutions, the TOV equation","authors":"Pham Van Ky","doi":"10.1140/epjc/s10052-025-14093-1","DOIUrl":"10.1140/epjc/s10052-025-14093-1","url":null,"abstract":"","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 3","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-14093-1.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143707182","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}

{"title":"Aspects of supersymmetry breaking driven inflation in orbifold models","authors":"G. A. Diamandis,&nbsp;K. Kaskavelis,&nbsp;A. B. Lahanas,&nbsp;G. Pavlopoulos","doi":"10.1140/epjc/s10052-025-14061-9","DOIUrl":"10.1140/epjc/s10052-025-14061-9","url":null,"abstract":"<div><p>We consider gravitationally induced corrections to inflaton potentials driven by supersymmetry breaking in a five-dimensional supergravity, compactified on a <span>( S_1/Z_2 )</span> orbifold. The supersymmetry breaking takes place on the hidden brane and is transmitted to the visible brane through finite one loop graphs giving rise to an inflaton potential which includes gravitationally induced terms. These corrections are significant for inflationary cosmology and have the potential to modify the predictions of widely studied supergravity models if the latter are embedded in this framework. To explore these effects we examine two classes of models those inspired by no-scale supergravity models and <span>(alpha )</span>-attractors. Both models are compatible with current cosmological observations but face chalenges in reconciling enhanced values for the scalar power spectrum <span>( P_zeta )</span> with cosmological data, particularly regarding the tensor to scalar ratio <i>r</i>. In fact <span>( P_zeta gtrsim 10^{-2})</span> results to <span>( r &gt; {mathcal {O}} (0.1) )</span>, outside the limits put by current data.\u0000</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 3","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-14061-9.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143706976","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}

{"title":"Higgs-portal dark matter in Brane-world cosmology","authors":"Taoli Liu,&nbsp;Nobuchika Okada,&nbsp;Digesh Raut","doi":"10.1140/epjc/s10052-025-14031-1","DOIUrl":"10.1140/epjc/s10052-025-14031-1","url":null,"abstract":"<div><p>The Higgs-portal scalar dark matter (DM) model is a simple extension of the Standard Model (SM) to incorporate a DM particle to the SM, where a <span>(Z_2)</span>-odd real scalar field is introduced as a DM candidate. We consider this DM model in the context of 5-dimensional brane-world cosmology, where our 3-dimensional space is realized as a hyper-surface embedded in 4-dimensional space. In the setup, all the SM and DM fields reside on the hyper-surface while graviton lives in the bulk. We consider two well-known brane-world cosmologies, namely, the Randall–Sundrum (RS) and the Gauss–Bonnet (GB) brane-world cosmologies, in which the standard Big Bang cosmology is reproduced at low temperatures below the so-called “transition temperature” while at high temperatures the expansion law of the universe is significantly modified. Such a non-standard expansion law directly impacts the prediction for the relic density of the Higgs-portal DM. We investigate the brane-world cosmological effects and identify the allowed model parameter region by combining the constraints from the observed DM relic density, and the direct and indirect DM detection experiments. It is well-known that only DM masses in the vicinity of half the Higgs boson mass are allowed in the Higgs-portal scalar DM model. We find that the allowed parameter region becomes more severely constrained and even disappears in the RS cosmology, while the GB cosmological effect significantly enlarges the allowed region. Upon discovering Higgs-portal DM, we can determine transition temperature in the GB brane-world cosmology.\u0000</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 3","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-14031-1.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143707065","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}