The European Physical Journal C最新文献_第7页

Gravitational Faraday holonomy

IF 4.2 2区物理与天体物理

The European Physical Journal C Pub Date : 2025-04-02 DOI: 10.1140/epjc/s10052-025-14086-0

Blake A. Parvin, Mark T. Lusk

引用次数: 0

Some simple theories of gravity with propagating nonmetricity

IF 4.2 2区物理与天体物理

The European Physical Journal C Pub Date : 2025-04-02 DOI: 10.1140/epjc/s10052-025-14036-w

Yusuke Mikura, Roberto Percacci

引用次数: 0

Nonmetricity-based hybrid self-gravitating compact stars with embedded class-one symmetry

IF 4.2 2区物理与天体物理

The European Physical Journal C Pub Date : 2025-04-02 DOI: 10.1140/epjc/s10052-025-14102-3

Naveed Iqbal, S. Khan, Mohammad Alshammari, Wael W. Mohammed, M. Ilyas

{"title":"Nonmetricity-based hybrid self-gravitating compact stars with embedded class-one symmetry","authors":"Naveed Iqbal, S. Khan, Mohammad Alshammari, Wael W. Mohammed, M. Ilyas","doi":"10.1140/epjc/s10052-025-14102-3","DOIUrl":"10.1140/epjc/s10052-025-14102-3","url":null,"abstract":"<div>This work aims to explore the novel characteristics of a static hybrid transitional star with a spherical distribution of relativistic matter under the embedded class one metric framework. This theoretical stellar model is derived using the nonmetricity-inspired (f(mathbb {Q})) gravity, featuring a core-crust structure: a strange matter core embedded in a normal matter crust. Our model incorporates pressure anisotropy as an intrinsic characteristic of highly compact strange stars, a feature expected to arise in the super-dense regime. The equation of state, in its basic form, using the MIT bag model is employed to represent correlation between pressure and density in quark matter inside the star’s core. The development of this model involves selecting the temporal gravitational potential based on the Tolman–Kuchowicz ansatz, while the radial gravitational potential is determined using the Class One embedding formalism. We employed both analytical and graphical methods to assess the robustness and equilibrium of the presented stellar solution. We provide an in-depth description of the astrophysical features of the model and show that they fulfill regularity requirements. A key finding of this investigation is the absence of a core singularity within the anisotropic stellar formation. The solution matches the properties of the observed self-gravitating pulsar objects: SAX J1804.4-3658 (SS1), EXO1745-248, 4U1820-30, 4U1608-52, PSR J0740+6620, PSR J0030+0451, Cen X-4, and SAX J1804.4-3658 (SS2). \u0000</div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 4","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-14102-3.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143749130","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

Reconciling fractional entropy and black hole entropy compositions

IF 4.2 2区物理与天体物理

The European Physical Journal C Pub Date : 2025-04-02 DOI: 10.1140/epjc/s10052-025-14107-y

Manosh T. Manoharan, N. Shaji

{"title":"Reconciling fractional entropy and black hole entropy compositions","authors":"Manosh T. Manoharan, N. Shaji","doi":"10.1140/epjc/s10052-025-14107-y","DOIUrl":"10.1140/epjc/s10052-025-14107-y","url":null,"abstract":"<div>This study investigates the implications of adopting fractional entropy in the area law framework and demonstrates its natural alignment with an isothermal description of black hole composition. We discuss the Zeroth law compatibility of the fractional entropy and define an empirical temperature for the horizon. We highlight the distinction between the empirical and conventional Hawking temperatures associated with the black holes. Unlike the Hawking temperature, this empirical temperature appears universal, and its proximity to the Planck temperature suggests a possible quantum gravity origin. We also establish the connection between these temperatures. Furthermore, extending the conventional fractional parameter q, constrained between 0 and 1, we establish that any positive real number can bound q under the concavity condition, provided the log of micro-state dimensionality exceeds (q-1). Specifically, for black holes, (q = 2), necessitating micro-state dimensionality greater than e, thereby excluding the construction of black hole horizon states with two level bits or qubits. We also identify the connection between the validity of the second law and information fluctuation complexity. The second law requires that the variance of information content remain smaller than the area of the black hole horizon. This constraint naturally gives rise to a Boltzmann–Gibbs-like entropy for the black hole, which, in contrast to the canonical formulation, is associated with its mass rather than its area. Equilibrium distribution analysis uncovers multiple configurations, in which the one satisfying the prerequisites of probability distribution exhibits an exponent stretched form, revealing apparent deviation from the Boltzmann distribution.</div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 4","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-14107-y.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143749132","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

Information conservation in de Sitter tunneling

IF 4.2 2区物理与天体物理

The European Physical Journal C Pub Date : 2025-04-02 DOI: 10.1140/epjc/s10052-025-14101-4

Baoyu Tan

引用次数: 0

Energy conditions in (f(Q, L_m)) gravity f(Q, L_m)) 引力中的能量条件

IF 4.2 2区物理与天体物理

The European Physical Journal C Pub Date : 2025-04-02 DOI: 10.1140/epjc/s10052-025-14112-1

Y. Myrzakulov, O. Donmez, M. Koussour, S. Muminov, D. Ostemir, J. Rayimbaev

{"title":"Energy conditions in (f(Q, L_m)) gravity","authors":"Y. Myrzakulov, O. Donmez, M. Koussour, S. Muminov, D. Ostemir, J. Rayimbaev","doi":"10.1140/epjc/s10052-025-14112-1","DOIUrl":"10.1140/epjc/s10052-025-14112-1","url":null,"abstract":"<div>We are experiencing a golden age of experimental cosmology, with exact and accurate observations being used to constrain various gravitational theories like never before. Alongside these advancements, energy conditions play a crucial theoretical role in evaluating and refining new proposals in gravitational physics. We investigate the energy conditions (WEC, NEC, DEC, and SEC) for two (f(Q, L_m)) gravity models using the FLRW metric in a flat geometry. Model 1, (f(Q, L_m) = -alpha Q + 2L_m + beta ), features linear parameter dependence, satisfying most energy conditions while selectively violating the SEC to explain cosmic acceleration. The EoS parameter transitions between quintessence, a cosmological constant, and phantom energy, depending on (alpha ) and (beta ). Model 2, (f(Q, L_m) = -alpha Q + lambda (2L_m)^2 + beta ), introduces nonlinearities, ensuring stronger SEC violations and capturing complex dynamics like dark energy transitions. While Model 1 excels in simplicity, Model 2’s robustness makes it ideal for accelerated expansion scenarios, highlighting the potential of (f(Q, L_m)) gravity in explaining cosmic phenomena.\u0000</div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 4","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-14112-1.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143761722","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 bosonic string spectrum and the explicit states up to level 10 from the lightcone and the chaotic behavior of certain string amplitudes

IF 4.2 2区物理与天体物理

The European Physical Journal C Pub Date : 2025-04-02 DOI: 10.1140/epjc/s10052-025-13955-y

Igor Pesando

{"title":"The bosonic string spectrum and the explicit states up to level 10 from the lightcone and the chaotic behavior of certain string amplitudes","authors":"Igor Pesando","doi":"10.1140/epjc/s10052-025-13955-y","DOIUrl":"10.1140/epjc/s10052-025-13955-y","url":null,"abstract":"<div>We compute the irreps and their multiplicities of bosonic string spectrum up to level 10 and we give explicitly the on shell top level lightcone states which make the irreps. For the irreps up to three indexes and all the totally antisymmetric ones we give the general recipe and the full irreps. It turns out that lightcone is quite efficient in building these low indexes irreps once the top level states are known. For scalars and vectors we compute the multiplicity up to level 22 and 19 respectively. The first scalar at odd level appears at level 11. For the bosonic string in non critical dimensions we argue that at level N there are always states transforming as tensors with (sge frac{1}{2} N) indices. Only in critical dimensions there are states with (sle frac{1}{2} N). Looking at the explicit coefficients of the combinations needed to make the irreps from the lightcone states we trace the origin of the chaotic behavior of certain cubic amplitudes considered in literature to the extremely precise and sensitive mixtures of states. For example the vectors at level (N=19) are a linear combinations of states and when the coefficients are normalized to be integer some of them have more than 1200 figures.\u0000</div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 4","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-13955-y.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143749129","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

Probing light scalars and vector-like quarks at the high-luminosity LHC 在高亮度大型强子对撞机上探测轻标量和类矢量夸克

IF 4.2 2区物理与天体物理

The European Physical Journal C Pub Date : 2025-04-02 DOI: 10.1140/epjc/s10052-025-14085-1

U. S. Qureshi, A. Gurrola, A. Flórez, C. Rodriguez

{"title":"Probing light scalars and vector-like quarks at the high-luminosity LHC","authors":"U. S. Qureshi, A. Gurrola, A. Flórez, C. Rodriguez","doi":"10.1140/epjc/s10052-025-14085-1","DOIUrl":"10.1140/epjc/s10052-025-14085-1","url":null,"abstract":"<div>A model based on a (U(1)_{T^3_R}) extension of the Standard Model can address the mass hierarchy between generations of fermions, explain thermal dark matter abundance, and the muon (g - 2), (R_{(D)}), and (R_{(D^*)}) anomalies. The model contains a light scalar boson (phi ') and a heavy vector-like quark (chi _textrm{u}) that can be probed at CERN’s large hadron collider (LHC). We perform a phenomenology study on the production of (phi ') and ({chi }_u) particles from proton–proton ((textrm{pp})) collisions at the LHC at (sqrt{s}=13.6) TeV, primarily through (g{-g}) and (t{-chi _textrm{u}}) fusion. We work under a simplified model approach and directly take the (chi _textrm{u}) and (phi ') masses as free parameters. We perform a phenomenological analysis considering (chi _textrm{u}) final states to b-quarks, muons, and neutrinos, and (phi ') decays to (mu ^+mu ^-). A machine learning algorithm is used to maximize the signal sensitivity, considering an integrated luminosity of 3000 (text {fb}^{-1}). The proposed methodology can be a key mode for discovery over a large mass range, including low masses, traditionally considered difficult due to experimental constraints.\u0000\u0000</div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 4","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-14085-1.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143761724","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

Transport phenomena and KSS bound in quantum-corrected AdS black holes

IF 4.2 2区物理与天体物理

The European Physical Journal C Pub Date : 2025-04-01 DOI: 10.1140/epjc/s10052-025-14103-2

Behnam Pourhassan, İzzet Sakallı

{"title":"Transport phenomena and KSS bound in quantum-corrected AdS black holes","authors":"Behnam Pourhassan, İzzet Sakallı","doi":"10.1140/epjc/s10052-025-14103-2","DOIUrl":"10.1140/epjc/s10052-025-14103-2","url":null,"abstract":"<div>In this paper, we study quantum effects on transport properties of charged anti-de Sitter (AdS) black holes, focusing on non-perturbative corrections to the shear viscosity-to-entropy ratio. We consider exponential corrections to both the entropy and transport coefficients, examining their impact on the Kovtun–Son–Starinets (KSS) bound. Through detailed analysis, we demonstrate that quantum corrections significantly modify transport phenomena, particularly in the small-horizon-radius regime. We explore three scenarios: unmodified shear viscosity with quantum-corrected entropy, quantum corrections to both quantities, and preservation of the universal ratio. Our results show that electrical conductivity, bulk viscosity, and thermal conductivity receive substantial modifications from quantum effects while maintaining consistency with established transport laws. The analysis reveals that for the positive correction coefficient, the KSS bound can be violated, while for the negative correction coefficient, it remains valid. We demonstrate these effects through numerical analysis and graphical representations, providing insight into quantum transport phenomena in strongly coupled systems.\u0000</div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 4","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-14103-2.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143749097","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

Bound states of a fermion-dyon system

IF 4.2 2区物理与天体物理

The European Physical Journal C Pub Date : 2025-04-01 DOI: 10.1140/epjc/s10052-025-14073-5

A. Yu. Loginov

引用次数: 0