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The Chiral Ring of D=4$D=4$, N=1${\mathcal {N}}=1$ SYM with Exceptional Gauge Groups Fortschr. Phys. (IF 3.9) Pub Date : 2024-03-17 Martin Cederwall, Gabriele Ferretti
The Cachazo–Douglas–Seiberg–Witten conjecture, concerning the algebraic structure of the chiral ring in , supersymmetric Yang–Mills theory, is proven for exceptional gauge groups. This completes the proof of the conjecture.
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On the Relations between Fermion Masses and Isospin Couplings in the Microscopic Model Fortschr. Phys. (IF 3.9) Pub Date : 2024-03-17 Bodo Lampe
Quark and lepton masses and mixings are considered in the framework of the microscopic model. The most general ansatz for the interactions among tetrons leads to a Hamiltonian involving Dzyaloshinskii‐Moriya (DM), Heisenberg and torsional isospin forces. Diagonalization of the Hamiltonian provides for 24 eigenvalues which are identified as the quark and lepton masses. While the masses of the third
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Krylov Complexity of Fermionic and Bosonic Gaussian States Fortschr. Phys. (IF 3.9) Pub Date : 2024-03-16 Kiran Adhikari, Adwait Rijal, Ashok Kumar Aryal, Mausam Ghimire, Rajeev Singh, Christian Deppe
The concept of complexity has become pivotal in multiple disciplines, including quantum information, where it serves as an alternative metric for gauging the chaotic evolution of a quantum state. This paper focuses on Krylov complexity, a specialized form of quantum complexity that offers an unambiguous and intrinsically meaningful assessment of the spread of a quantum state over all possible orthogonal
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The Mass Gap of the Space‐time and its Shape Fortschr. Phys. (IF 3.9) Pub Date : 2024-03-04 Ahmed Farag Ali
Snyder's quantum space‐time which is Lorentz invariant is investigated. It is found that the quanta of space‐time have a positive mass that is interpreted as a positive real mass gap of space‐time. This mass gap is related to the minimal length of measurement which is provided by Snyder's algebra. Several reasons to consider the space‐time quanta as a 24‐cell are discussed. Geometric reasons include
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Particle Dynamics and Matter Accretion onto Non‐linear Charged AdS Black Holes in Massive Gravity Fortschr. Phys. (IF 3.9) Pub Date : 2024-02-27 Adnan Malik, M. Umair Shahzad
This article investigates the dynamics of charged particles and accretion process around nonlinear charged AdS black holes (BHs). the impact of key factors such as angular momentum, specific energy, and magnetic field on the behavior of particles are focused. Firstly, the concept of the effective potential is examined, which provides insights into the forces acting on particles and the escape velocity
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Singularity‐Free Charged Compact Star Model Under F(Q)$F(Q)$‐Gravity Regime Fortschr. Phys. (IF 3.9) Pub Date : 2024-02-27 Sunil Kumar Maurya, Mahmood Khalid Jasim, Abdelghani Errehymy, Kottakkaran Sooppy Nisar, Mona Mahmoud, Riju Nag
In this paper, the possibility of existing a novel class of compact charged spheres based on a charged perfect fluid within the realm of gravity theory is explored. The authors started by proposing physically meaningful explicit formulas for the potential, denoted , and the electric field to find a close‐form solution. More precisely, the change of the dependent variable approach by exploiting the
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New Wormhole Solutions in Quadratic f(Q)$f(\mathcal {Q})$‐Gravity Regime Fortschr. Phys. (IF 3.9) Pub Date : 2024-02-27 Sweeti Kiroriwal, Jitendra Kumar, Sunil Kumar Maurya, Sourav Chaudhary, Abdul Aziz
Nowadays, alternative gravity is a crucial tool for addressing some enduring observational problems, such as the dark universe. Additionally, they can be used to advance the results of general relativity in astrophysics. Wormholes, or imagined passageways through spacetime, have the potential to revolutionize interstellar transport and cosmic interconnection. In the present work, the existence and
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Asymptotically‐Flat Black Hole Solutions in Symmergent Gravity Fortschr. Phys. (IF 3.9) Pub Date : 2024-02-25 Beyhan Puliçe, Reggie C. Pantig, Ali Övgün, Durmuş Demir
Symmergent gravity is an emergent gravity model with an curvature sector and an extended particle sector having new particles beyond the known ones. With constant scalar curvature, asymptotically flat black hole solutions are known to have no sensitivity to the quadratic curvature term (coefficient of ). With variable scalar curvature, however, asymptotically‐flat symmergent black hole solutions turn
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On the Generalized Lemaitre Tolman Bondi Metric: Classical Sensitivities and Quantum Einstein-Vaz Shells Fortschr. Phys. (IF 3.9) Pub Date : 2024-02-18 Mohammadreza Molaei, Christian Corda
In this paper, in the classical framework, the lower bounds for the sensitivities of the generalized Lemaitre Tolman Bondi metric are evaluated. The calculated lower bounds via the linear dynamical systems L∂∂θ$L_{\frac{\partial }{\partial \theta }}$, L∂∂r$L_{\frac{\partial }{\partial r}}$, and L∂∂ϕ$L_{\frac{\partial }{\partial \phi }}$ are −ln2+ln|(ṘB)2−(R′)2|−2ln|B|$-\ln 2+\ln|{(\dot{R}B)}^{2}-{(R^{\prime
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Collapsing Shear-Free Anisotropic Embedding Star Model in f(R) Gravity Fortschr. Phys. (IF 3.9) Pub Date : 2024-02-15 Hammad Nazar, Ghulam Abbas, Athar Abbas, Shahid Qaisar
The current paper studied the dynamics of shear-free and spherically symmetric collapsing stars by incorporating the features of anisotropic dissipative fluid in the realm of f(R)$f(R)$ gravity. A complete radiative star model that describes the early static configuration obeying the embedding class 1 approach is generated. To acquittance the exact solutions of the geometric variables, a specific
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de Sitter Versus Anti-de Sitter in Horndeski-Like Gravity Fortschr. Phys. (IF 3.9) Pub Date : 2024-02-11 Fabiano F. Santos, Behnam Pourhassan, Emmanuel N. Saridakis
The general solutions of Horndeski-like gravity that can interpolate between the de Sitter and anti-de Sitter regimes are presented. In particular, the first-order formalism with two scalar fields is developed, and considering a black hole ansatz with flat slicing, three different cases, namely exponential, vacuum, and smooth superpotential solutions, with no Minkowski extrema are investigated. Furthermore
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Viable and Stable Compact Stellar Structures in f(Q,T) Theory Fortschr. Phys. (IF 3.9) Pub Date : 2024-02-11 M. Zeeshan Gul, M. Sharif, Adeeba Arooj
The main objective of this paper is to investigate the impact of f(Q,T)$f(\mathcal {Q},\mathcal {T})$ gravity on the geometry of anisotropic compact stellar objects, where Q$\mathcal {Q}$ is non-metricity and T$\mathcal {T}$ is the trace of the energy-momentum tensor. In this perspective, the physically viable non-singular solutions to examine the configuration of static spherically symmetric structures
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Nonassociative Geometric and Quantum Information Flows and R-Flux Deformations of Wormhole Solutions in String Gravity Fortschr. Phys. (IF 3.9) Pub Date : 2024-02-11 Laurenţiu Bubuianu, Douglas Singleton, Sergiu I. Vacaru, Elşen Veli Veliev
This article consists of an introduction to the theory of nonassociative geometric classical and quantum information flows defined by star products with R-flux deformations in string gravity. Corresponding nonassociative generalizations of the concepts of classical Shannon entropy, quantum von Neumann entropy, Rényi entropy are formulated. The fundamental geometric and quantum information objects are
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Soft Factors and Interaction Vertices from Light-Cone Actions Fortschr. Phys. (IF 3.9) Pub Date : 2024-02-04 Sudarshan Ananth, Chetan Pandey, Saurabh Pant
Universal factors associated with the emission of a soft boson in gauge theories and gravity, formulated in the light-cone gauge, are presented. The inverse-soft method, for constructing higher-point amplitudes from lower-point ones, using these factors is reviewed. These ideas are then examined in (light-cone) superspace and applied to both the N=4$\mathcal {N}=4$ super Yang–Mills and N=8$\mathcal
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Dynamically Charged Spheres and their Stability in Einstein-Gauss-Bonnet Gravity Fortschr. Phys. (IF 3.9) Pub Date : 2024-01-28 Atteeq ur Rehman, Muhammad Zaeem ul Haq Bhatti, Zeeshan Yousaf
Electrically charged anisotropic fluid spheres with vanishing expansion scalar condition under the influence of a newly established gravitational scheme are investigated in this study, i.e., 4D$4\textsf {D}$ Einstein-Gauss-Bonnet (EGB) gravity. Glavan and Lin introduced this framework, in which they rescaled the coupling factor α$\alpha$ using αD−4$\frac{\alpha }{D-4}$ and derived the gravitational
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Quasinormal Modes and Greybody Factors of de Sitter Black Holes Surrounded by Quintessence in Rastall Gravity Fortschr. Phys. (IF 3.9) Pub Date : 2024-01-25 Dhruba Jyoti Gogoi, Narges Heidari, Jan K̆rí̆z, Hassan Hassanabadi
In this work, the quasinormal mode, greybody factors, and absorption cross section of de Sitter Reissner-Nordström black hole surrounded by quintessence field in Rastall gravity are studied. The violation of energy-momentum conservation has a non-linear effect on the quasinormal modes. With an increase in the black hole charge, both real parts of quasinormal modes i.e. oscillation frequency of ring-down
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Editorial Fortschr. Phys. (IF 3.9) Pub Date : 2024-01-08
The Nobel Prize in Physics 2023 was awarded jointly to Pierre Agostini, Ferenc Krausz, and Anne L'Huillier for groundbreaking experiments in the field of atto-second laser impulses, which provide new tools for exploring the world of electrons inside atoms and molecules. In fact, the interplay and the interaction between light and matter play an important role for many physical applications, like, in
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Exploring Late-Time Cosmic Acceleration with Eos Parameterizations in Horava-Lifshitz Gravity via Baryon Acoustic Oscillations Fortschr. Phys. (IF 3.9) Pub Date : 2024-01-08 Madhur Khurana, Himanshu Chaudhary, Ujjal Debnath, Alok Sardar, Ghulam Mustafa
In this study, the framework of Horava-Lifshitz gravity to model the Universe's dark matter and dark energy (DE) components is adopted. Specifically, two recent parametrizations for DE models: the CBDRM-type and CADMM-type parameterizations is considered. In the analysis, the Hubble parameter is explicitly expressed, denoted as H(z)$H(z)$, for these two distinct dark energy models. By doing so, investigate
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Octonionic Magical Supergravity, Niemeier Lattices, and Exceptional & Hilbert Modular Forms Fortschr. Phys. (IF 3.9) Pub Date : 2024-01-03 Murat Günaydin, Abhiram Kidambi
The quantum degeneracies of Bogomolny-Prasad-Sommerfield (BPS) black holes of octonionic magical supergravity in five dimensions are studied. Quantum degeneracy is defined purely number theoretically as the number of distinct states in charge space with a given set of invariant labels. Quantum degeneracies of spherically symmetric stationary BPS black holes are given by the Fourier coefficients of
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Evolutionary Algorithms for Multi-Center Solutions Fortschr. Phys. (IF 3.9) Pub Date : 2023-12-30 Sami Rawash, David Turton
Large classes of multi-center supergravity solutions have been constructed in the study of supersymmetric black holes and their microstates. Many smooth multi-center solutions have the same charges as supersymmetric black holes, with all centers deep inside a long black-hole-like throat. These configurations are constrained by regularity, absence of closed timelike curves, and charge quantization.
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Constructing and Machine Learning Calabi-Yau Five-Folds Fortschr. Phys. (IF 3.9) Pub Date : 2023-12-21 Rashid Alawadhi, Daniele Angella, Andrea Leonardo, Tancredi Schettini Gherardini
Motivated by their role in M-theory, F-theory, and S-theory compactifications, all possible complete intersections Calabi-Yau five-folds in a product of four or less complex projective spaces are constructed, with up to four constraints. A total of 27 068 spaces are obtained, which are not related by permutations of rows and columns of the configuration matrix, and determine the Euler number for all
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Decoding Nature with Nature's Tools: Heterotic Line Bundle Models of Particle Physics with Genetic Algorithms and Quantum Annealing Fortschr. Phys. (IF 3.9) Pub Date : 2023-12-21 Steve A. Abel, Andrei Constantin, Thomas R. Harvey, Andre Lukas, Luca A. Nutricati
The string theory landscape may include a multitude of ultraviolet embeddings of the Standard Model, but identifying these has proven difficult due to the enormous number of available string compactifications. Genetic Algorithms (GAs) represent a powerful class of discrete optimisation techniques that can efficiently deal with the immensity of the string landscape, especially when enhanced with input
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Entanglement Negativity in de Sitter Biverse from Stringy Axionic Bell Pair: An Analysis Using Bunch-Davies Vacuum Fortschr. Phys. (IF 3.9) Pub Date : 2023-11-27 Sayantan Choudhury
In this work, signatures of quantum entanglement by computing entanglement negativity between two causally unrelated regions in 3 + 1 dimensional global de Sitter space are studied. A bipartite quantum field theoretic setup for this purpose, driven by an axionic Bell pair resulting from Type IIB string compactification on a Calabi-Yau three fold is investigated. A spherical surface that divides the
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Unification of Gravity and Internal Interactions Fortschr. Phys. (IF 3.9) Pub Date : 2023-11-10 Spyros Konitopoulos, Danai Roumelioti, George Zoupanos
In the gauge theoretic approach of gravity, general relativity is described by gauging the symmetry of the tangent manifold in four dimensions. Usually the dimension of the tangent space is considered to be equal to the dimension of the curved manifold. However, the tangent group of a manifold of dimension d is not necessarily SOd$SO_d$. It has been suggested earlier that by gauging an enlarged symmetry
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A Lesson from RττK(*) and RννK(*) at Belle II Fortschr. Phys. (IF 3.9) Pub Date : 2023-11-07 Arturo de Giorgi, Gioacchino Piazza
Within the assumption of Left-Handed (LH) New Physics (NP), the relations between B ( B → K ( * ) τ + τ − ) $\mathcal {B}(B\rightarrow K^{(\ast )} \tau ^+\tau ^-)$ and B ( B → K ( * ) ν ν ¯ ) $\mathcal {B}(B\rightarrow K^{(\ast )} \nu \bar{\nu })$ for several Beyond the Standard Model (BSM) scenarios are reviewed, commonly considered to explain the Lepton flavor Universality (LFU) violation observed
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AdS Black Hole Thermodynamics and Microstructures from f(Q) Gravitation Fortschr. Phys. (IF 3.9) Pub Date : 2023-11-03 Oleksii Sokoliuk, Sneha Pradhan, Alexander Baransky, Pradyumn Kumar Sahoo
The significant properties and phase transition of charged Anti-de Sitter (AdS) black holes have been extensively studied in a variety of modified theories of gravity in the presence of numerous matter fields. The goal of the current research is to investigate the AdS black hole's thermodynamics under the impact of f(Q)$f(Q)$ gravity. Additionally, this paper explores the black hole's local stability
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Cosmology of Metric-Affine R+βR2 Gravity with Pure Shear Hypermomentum Fortschr. Phys. (IF 3.9) Pub Date : 2023-11-02 Damianos Iosifidis, Ratbay Myrzakulov, Lucrezia Ravera
In this paper, cosmological aspects of metric-affine f(R)$f(R)$ gravity with hyperfluid are studied. The equations of motion of the theory are obtained by varying the action with respect to the metric and the independent connection. Subsequently, considering a Friedmann-Lemaître-Robertson-Walker background, the modified Friedmann equations in the presence of a perfect cosmological hyperfluid is derived
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Scalar Perturbations of Gravitational Collapse under Homotopy Perturbation Method: A Critical Study on the Rectangular and Price Potential Fortschr. Phys. (IF 3.9) Pub Date : 2023-10-31 Abdul Aziz, Amit Das, Saibal Ray
In order to unveil different features of gravitational waves due to massive objects like black hole etc., researchers primarily attempt to find the corresponding quasi normal modes from the relevant wave equations. In the present article, homotopy perturbation method (HPM) is employed to obtain the wave functions by solving wave equations for one-dimensional potential barriers. Under this scheme (i)
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Singularity Free Star Model Characterized by Quintessence Field in Quadratic f(Q) Gravity Fortschr. Phys. (IF 3.9) Pub Date : 2023-10-26 Piyali Bhar
In the context of the f ( Q ) $f(Q)$ theory of gravity, a spherically symmetric quintessence DE model in this article is offered. For this reason, f ( Q ) $f(Q)$ has the formula f ( Q ) = a Q 2 + Q $f(Q)=aQ^2+Q$ , where Q stands for the non-metricity scalar and ‘a’ is the coupling constant for modified gravity has been taken into account. It is supposed that the quintessence field defined by the parameter
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Can Charged Stars be Singularity-Free? Fortschr. Phys. (IF 3.9) Pub Date : 2023-10-07 Sudan Hansraj, Chevarra Hansraj, Abdelghani Errehymy, Lushen Moodly
While the configuration of a static spherically symmetric distribution of perfect fluid in an electric field has received extensive attention in the literature, only a few works have investigated the conformally flat case. The model exhibits a remarkable property being regular or singularity free is proposed. This is unexpected given that Coulombic repulsion opposes the collapse of a star to the center
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Black Holes as Frozen Stars: Regular Interior Geometry Fortschr. Phys. (IF 3.9) Pub Date : 2023-10-04 Ram Brustein, Allan Joseph Michael Medved, Tom Shindelman, Tamar Simhon
The authors have proposed a model geometry for the interior of a regular black hole (BH) mimicker, the frozen star, whose most startling feature is that each spherical shell in its interior is a surface of infinite redshift. The geometry is a solution of the Einstein equations which is sourced by an exotic matter with maximally negative radial pressure. The frozen star geometry is previously presented
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Cosmic Evolution of Five-dimensional Einstein Chern-Simons Gravity Through Dark Energy Model Fortschr. Phys. (IF 3.9) Pub Date : 2023-09-30 Abdul Jawad, Fareeha Kiran, Shamaila Rani
In this paper, the cosmic evolution in the context of five-dimensional Einstein Chern-Simons gravity theory by using flat homogeneous and isotropic universe model is studied. The interaction is taken into account between dark sector of the evolving universe along with holographic dark energy model with Hubble horizon. Our study with well-known models EChS -β5 and EChS - β 5 ∼ $\tilde{\beta _5}$ for
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Aspects of Kink-Like Structures in 2D Dilaton Gravity Fortschr. Phys. (IF 3.9) Pub Date : 2023-09-25 Francisco Cleiton E. Lima, Carlos Alberto S. Almeida
The topological structures that arise from two-dimensional (2D) models are relevant physically and the first step toward understanding more complex systems. In this work, one studies the kink-like solutions of the matter field that emerge in a 2D dilaton gravity scenario. Considering this scenario, the linear stability of the matter field and the translational mode is examined. Due to the specific
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Matrix Models and Non-Abelian T Dual of AdS5×S5$AdS_5 \times S^5$ Fortschr. Phys. (IF 3.9) Pub Date : 2023-09-23 Dibakar Roychowdhury
Euclidean Wilson loops for BMN Plane Wave Matrix Models is computed. The stringy counterpart of these Wilson loops corresponds to various semi-classical open string embedding that probe a class of half BPS geometries in Type IIA supergravity. These geometries fall under the general category of Lin-Lunin and Maldacena (LLM). As a special class of solutions within the LLM category, Wilson operators corresponding
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String Model Building on Quantum Annealers Fortschr. Phys. (IF 3.9) Pub Date : 2023-09-20 Steven Abel, Luca A. Nutricati, John Rizos
For the first time the direct construction of string models on quantum annealers has been explored and has been investigated their efficiency and effectiveness in the model discovery process. Through a thorough comparison with traditional methods such as simulated annealing, random scans, and genetic algorithms, it is highlighted the potential advantages offered by quantum annealers, which in this
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Noether Gauge Symmetry Approach Applying for the Non-Minimally Coupled Gravity to the Maxwell Field Fortschr. Phys. (IF 3.9) Pub Date : 2023-09-15 Somayyeh Mahmoudi, Somayeh Hajkhalili, Seyed Hossein Hendi
Taking the Noether gauge symmetry approach into account, spherically symmetric static black hole solutions of the non-minimal gauge-gravity Lagrangian of the R β F 2 $\mathcal {R}^\beta F^2$ model is found. At first, a system of differential equations for the general non-minimal couplings of Y ( R ) F 2 $Y(\mathcal {R})F^2$ type is considered, and then, it is regarded as a particular R β F 2 $\mathcal
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AdS/BCFT Correspondence and Horndeski Gravity in the Presence of Gauge Fields: Holographic Paramagnetism/Ferromagnetism Phase Transition Fortschr. Phys. (IF 3.9) Pub Date : 2023-09-14 Fabiano F. Santos, Moisés Bravo-Gaete, Oleksii Sokoliuk, Alexander Baransky
This paper presents a dual gravity model for a (2+1)-dimensional system with a limit on finite charge density and temperature, which will be used to study the properties of the holographic phase transition to paramagnetism-ferromagnetism in the presence of Horndeski gravity terms. In our model, the non-zero charge density is supported by a magnetic field. As a result, the radius ρ / B $\rho /B$ indicates
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Regular Charged Black Holes, Energy Conditions, and Quasinormal Modes Fortschr. Phys. (IF 3.9) Pub Date : 2023-09-14 Leonardo Balart, Grigoris Panotopoulos, Ángel Rincón
Energy conditions and quasinormal modes (QNMs) for scalar perturbations of regular charged black holes within the framework of General Relativity coupled to non-linear electrodynamics (NLE) are discussed. The frequencies are computed numerically adopting the WKB method, while in the eikonal limit an analytic expression for the spectra is obtained. The impact of the electric charge, the angular degree
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Model-Independent Study for a Quintessence Model of Dark Energy: Analysis and Observational Constraints Fortschr. Phys. (IF 3.9) Pub Date : 2023-09-14 Amine Bouali, Himanshu Chaudhary, Amritansh Mehrotra, Shibesh Kumar Jas Pacif
In this paper, a well-motivated parameterization of the Hubble parameter (H) is revisited that renders two models of dark energy showing some intriguing features of the late-time accelerating Universe. A general quintessence field is considered as a source of dark energy. Tighter constraints using recently updated cosmic observational datasets for the considered models have been obtained. The two models
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Hamiltonian Analysis of f(Q)$f(\mathbb {Q})$ Gravity and the Failure of the Dirac–Bergmann Algorithm for Teleparallel Theories of Gravity Fortschr. Phys. (IF 3.9) Pub Date : 2023-09-12 Fabio D'Ambrosio, Lavinia Heisenberg, Stefan Zentarra
In recent years, f ( Q ) $f(\mathbb {Q})$ gravity has enjoyed considerable attention in the literature and important results have been obtained. However, the question of how many physical degrees of freedom the theory propagates—and how this number may depend on the form of the function f—has not been answered satisfactorily. In this article it is shown that a Hamiltonian analysis based on the Dirac-Bergmann
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Analysis of Accretion Disk Around the Euler-Heisenberg Anti-de Sitter Black Hole Fortschr. Phys. (IF 3.9) Pub Date : 2023-09-12 Ghulam Abbas, Hamza Rehman
The investigation of thin accretion disc surrounding the Einstein- Euler- Heisenberg- Anti- de Sitter black hole is demonstrated. Additionally, the black hole event horizons and compute their effective potential and equations of motion is analyzed. The specific energy, specific angular momentum, and specific angular velocity of the particles that move in circular orbits above the thin accretion disk
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The Timescales of Quantum Breaking Fortschr. Phys. (IF 3.9) Pub Date : 2023-08-18 Marco Michel, Sebastian Zell
Due to the inevitable existence of quantum effects, a classical description generically breaks down after a finite quantum break-time t q $t_q$ . We aim to find criteria for determining t q $t_q$ . To this end, we construct a new prototype model that features numerous dynamically accessible quantum modes. Using explicit numerical time evolution, we establish how t q $t_q$ depends on the parameters
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Evaporation of Dynamical Horizon with the Hawking Temperature in the K-essence Emergent Vaidya Spacetime Fortschr. Phys. (IF 3.9) Pub Date : 2023-08-12 Bivash Majumder, Saibal Ray, Goutam Manna
In the K-essence Vaidya Schwarzschild spacetime, the dynamical horizon equation to measure the mass-loss due to Hawking radiation and the tunneling formalism (Hamilton-Jacobi method) to calculate the hawking temperature is applied. Assuming the Dirac-Born-Infeld kind of non-standard action for the K-essence here, the background physical spacetime is a static spherically symmetric black hole, and the
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Scalar Field Evolution at Background and Perturbation Levels for a Broad Class of Potentials Fortschr. Phys. (IF 3.9) Pub Date : 2023-07-30 Genly Leon, Saikat Chakraborty, Sayantan Ghosh, Raja Solanki, P.K. Sahoo, Esteban González
In this paper, a non-interacting scalar field cosmology with an arbitrary potential using the f-deviser method that relies on the differentiability properties of the potential is investigated. Using this alternative mathematical approach, a unified dynamical system analysis at a scalar field's background and perturbation levels with arbitrary potentials is presented. For illustration, a monomial and
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Black Hole Solutions with Dark Matter Halos in the Four-Dimensional Einstein-Gauss-Bonnet Gravity Fortschr. Phys. (IF 3.9) Pub Date : 2023-07-25 Abdelghani Errehymy, S. K. Maurya, G. Mustafa, Sudan Hansraj, H. I. Alrebdi, Abdel-Haleem Abdel-Aty
Black holes (BHs) convey information about different matter-energy distributions in their immediate environment, as they bear the imprints of the intrinsic spacetime geometry and exotic surrounding matter. In this regard, exact spherically symmetric regular black hole (BH) solutions supported by two phenomenological distributions of dark matter galactic halos in Eintein-Gauss-Bonnet gravity are explored
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Resonance Interaction Due to Quantum Coherence Fortschr. Phys. (IF 3.9) Pub Date : 2023-07-20 Jiawei Hu, Hongwei Yu
The interaction energy between two atoms is crucially dependent on the quantum state of the two-atom system. In this paper, it is demonstrated that a steady resonance interaction energy between two atoms exists when the atoms are in a certain type of coherent superposition of single-excitation states. The interaction is tree-level classical in the sense of the Feynman diagrams. A quantity called quantum
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A Note on Modular Invariant Species Scale and Potentials Fortschr. Phys. (IF 3.9) Pub Date : 2023-07-14 Niccolò Cribiori, Dieter Lüst
The species scale provides an upper bound for the ultraviolet cutoff of effective theories of gravity coupled to a number of light particle species. Modular invariant (super-)potentials provide a simple and computable expression of the species scale as a function of the moduli in toroidal orbifold compactifications of type II and heterotic string are pointed out. Due t o modular symmetry, these functions
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Existence of Dark Energy Stars within Lower Mass Gap in the Realm of f(Q)$f(Q)$ Gravity Fortschr. Phys. (IF 3.9) Pub Date : 2023-07-13 Piyali Bhar
The object of this article is to study a new class of dark energy stars in the background of f ( Q ) $f(Q)$ gravity by using the metric potentials proposed by Krori-Barua [J. Phys. A, Math. Gen. 8:508 (1975)]. To achieve the goal, a quadratic form of f ( Q ) $f(Q)$ as f ( Q ) = a Q 2 + Q $f(Q)=a{Q}^{2}+Q$ is taken into account for the static spherically symmetric spacetime,`a' being a coupling parameter
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Resurgence of a de Sitter Glauber-Sudarshan State: Nodal Diagrams and Borel Resummation Fortschr. Phys. (IF 3.9) Pub Date : 2023-07-12 Suddhasattwa Brahma, Keshav Dasgupta, Mir-Mehedi Faruk, Bohdan Kulinich, Viraj Meruliya, Brent Pym, Radu Tatar
It is shown in this article that an explicit construction of a four-dimensional de Sitter space may be performed using a diagrammatic approach via nodal diagrams emanating from the path integral representation of the Glauber-Sudarshan state. Sum of these diagrams typically leads to an asymptotic series of Gevrey kind which can then be Borel resummed, thus reproducing the non-perturbative structure
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Bounds on Species Scale and the Distance Conjecture Fortschr. Phys. (IF 3.9) Pub Date : 2023-07-11 Damian van de Heisteeg, Cumrun Vafa, Max Wiesner
The species scale Λ s ≤ M pl $\Lambda _s\le M_{\rm pl}$ serves as a UV cutoff in the gravitational sector of an EFT and can depend on the moduli of the theory as the spectrum of the theory varies. It is argued that the dependence of the species scale Λ s ( ϕ ) $\Lambda _s (\phi )$ on massless (or light) modes ϕ i $\phi ^i$ satisfies M pl d − 2 | Λ s ′ / Λ s | 2 < O ( 1 ) $M_{\rm pl}^{d-2} |\Lambda
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Nonassociative Ricci Flows, Star Product and R-flux Deformed Black Holes, and Swampland Conjectures Fortschr. Phys. (IF 3.9) Pub Date : 2023-07-06 Laurenţiu Bubuianu, Sergiu I. Vacaru, Elşen Veli Veliev
A theory of nonassociative geometric flows is formulated as an extension of a string-inspired model of nonassociative gravity determined by star product. The nonassociative Ricci tensor and curvature scalar defined by (non) symmetric metric structures and generalized (non) linear connections are used for defining nonassociative versions of Grigori Perelman F- and W-functionals for Ricci flows and computing
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Passive Quantum Measurement: Arrival Time, Quantum Zeno Effect and Gambler's Fallacy Fortschr. Phys. (IF 3.9) Pub Date : 2023-07-02 Tajron Jurić, Hrvoje Nikolić
Classical measurements are passive, in the sense that they do not affect the physical properties of the measured system. Normally, quantum measurements are not passive in that sense. In the infinite dimensional Hilbert space, however, it is found that quantum projective measurement can be passive in a way which is impossible in finite dimensional Hilbert spaces. Specifically, it is found that expectation
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Bumping into the Species Scale with the Scalar Potential Fortschr. Phys. (IF 3.9) Pub Date : 2023-06-30 David Andriot
As a quantum gravity cut-off, the species scale Λ s $\Lambda _s$ gets naturally compared to the energy scale of a scalar potential V in an EFT. In this note, the species scale, its rate | ∇ Λ s | / Λ s $|\nabla \Lambda _s|/\Lambda _s$ and their field dependence, to those of a scalar potential is compared. To that end, a string compactification leading to a scalar potential with the same properties
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Observational Constraining Study of New Deceleration Parameters in FRW Universe Fortschr. Phys. (IF 3.9) Pub Date : 2023-06-25 Amine Bouali, Himanshu Chaudhary, Saadia Mumtaz, G. Mustafa, S. K. Maurya
In the current paper, a dark energy (DE) model reconstructed from the well-motivated deceleration parameter (DP) q ( z ) = q 0 + q 1 z / ( 1 + z ) 2 $q(z)=q_0+q_1 z/(1+z)^2$ is analyzed. A flat FRW Universe filled with radiation, dark matter (DM), and dark energy fluids is considered. The free parameters are constrained using measurements from Supernovae, Hubble, Gamma Ray Bursts, Quasars, and Baryon
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Compact Bardeen Stars in f(R,T)$f(\mathcal {R}, T)$ Theory with Conformal Motion Fortschr. Phys. (IF 3.9) Pub Date : 2023-06-24 Aisha Rashid, M. Farasat Shamir, Iffat Fayyaz
A set of exact spherically symmetric solutions for describing the interior of a relativistic star in the context of f ( R , T ) $f(\mathcal {R}, T)$ modified theory of gravity is presented. The existence of a Conformal Killing Vectors (CKV) and Bardeen's model to find the boundary conditions as an exterior space-time geometry to achieve the metric potentials for current study is used. Moreover, matching
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Dynamical Analysis in Chameleon Dark Energy Fortschr. Phys. (IF 3.9) Pub Date : 2023-06-21 Andronikos Paliathanasis
A detailed analysis of the phase-space for the field equations in scalar field cosmology with a chameleon cosmology in a spatially flat Friedmann–Lemaître–Robertson–Walker spacetime is presented. For the matter source it is assumed that it is an ideal gas with a constant equation of state parameter, while for the scalar field potential and the coupling function of the chameleon mechanism it is considered
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Perturbative Solution of the Einstein Constraints with Spin and Momentum Far Away From a Binary Source in the Bowen-York Formalism Fortschr. Phys. (IF 3.9) Pub Date : 2023-06-20 Emel Altas, Emine Ertugrul, Bayram Tekin
The momentum and Hamiltonian constraints of vacuum Einstein equations, within the Bowen-York formalism, for two interacting black holes in close separation, with anti-parallel spins and anti-parallel linear momenta is studied. An analytical solution using perturbation theory is given. The location and the shape of the apparent horizon which generically depend on all the parameters, angles, and the
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A Note on Integrability Loss in Fuzzball Geometries Fortschr. Phys. (IF 3.9) Pub Date : 2023-06-14 Maxim Emelin, Stefano Massai
The dynamics of certain string configurations in a class of fivebrane supertube backgrounds is studied. In the decoupling limit of the fivebranes, these solutions are known to admit an exact description in worldsheet string theory and string propagation is integrable. For the asymptotically flat solutions, by using analytic tools of classical Hamiltonian systems, the non-integrability of classical
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Witnessing Quantum Correlations in a Hybrid Qubit-Qutrit System Under Intrinsic Decoherence Fortschr. Phys. (IF 3.9) Pub Date : 2023-06-14 Fadwa Benabdallah, Khadija El Anouz, Atta ur Rahman, Mohammed Daoud, Abderrahim El Allati, Saeed Haddadi
Studying qubit-qutrit systems is crucial to harnessing their quantum advantages, especially in quantum secure technologies. In this regard, the present work consists of considering a qubit-qutrit system under intrinsic decoherence. For this hybrid-spin system, the relationship between negativity, local quantum uncertainty, and local quantum Fisher information is discussed. The results show that it