Thu·Jun 6, 2024Thursday·June 6, 2024

1. 01*

   Random fluctuation walk in the boson star formation process

   G.A. Kozlov🇷🇺

   We construct the mechanism of formation of the scalar boson star (BS) having a hierarchy of self-similar "lumps" of dark matter (DM) built into the probability distribution function of allowed steps. It can ensure to study the dynamics of the BS formation through the "cross-over" between the free scalar DM and the compact condensate (CC) phase in one-dimensional model of the random fluctuation walk. The main inputs are the random fluctuating weight $\lambda <1$, the fundamental fluctuating length $\xi (\lambda )$ and the parameter $a>1$ of the spatial separation between the DM "lumps" inside the BS. The solution to the functional equation for the characteristic probability to find the free scalar DM and the CC phase is obtained. The time evolution of the probability to form the DM "lump" (growth of the BS) is presented with the power-law cascades expression depending on $\lambda$ and $a$. The special cases for $\lambda$ in terms of the energy densities of the BS (${\rho }_{\star }$) and the DM (${\rho }_{\odot }$), as well as the Bose-Einstein correlation function for two scalar DM particles, are considered. The lower bounds on the critical temperature at the "cross-over" depending on ${\rho }_{\odot }$, ${\rho }_{\star }$, the average multiplicities of the scalar DM particles and the parameters related to the chaotically behaviour of the particles are obtained.

   hep-ph0 citations
2. 02*

   Neutrino mass textures and associated phenomenology in modular left-right symmetric model

   Ankita Kakoti🇮🇳 · Happy Borgohain🇮🇳 · Mrinal Kumar Das🇮🇳

   Neutrino mass textures play a crucial role in the study of various neutrino mass models and the associated phenomenology. The present work focuses on neutrino phenomenology in the framework of left-right symmetric model (LRSM) augmented by $A_4$ modular symmetry. More specifically we concentrated on the implementation of modular group of level 3 ($\Gamma (3)$). As the use of modular symmetry demands the assignment of different modular weights to the particle content of the model, we consider modular weights $k_Y$ = 4, 6, 8, 10 in LRSM which gives rise to different neutrino textures (texture zero structures) and study its consequent neutrino phenomenologies. Observables like resonant leptogenesis (RL), new physics contributions to neutrinoless double beta decay (NDBD)(momentum dependent ($\lambda$ and $\eta$) and right-handed neutrino contributions of NDBD and lepton flavor violation (LFV) has been deliberated. The study has been carried out for both normal and inverted ordering of neutrino mass and the correlations among the neutrino parameters for the present model has been elaborated for the TeV scale LRSM which can be tested in the experiments.

   hep-ph0 citations
3. 03*

   Exploring active-sterile neutrino mixings models in MES mechanism using modular $S_3$ symmetry

   Mayengbam Kishan Singh🇮🇳 · N. Nimai Singh🇮🇳

   We study the minimal extended seesaw mechanism with one sterile neutrino in a 3+1 framework using modular $S_3$ symmetry. The active-sterile neutrino models are classified based on the assignments of $S_3$ representations and modular weights of the left-handed lepton doublets, triplet right-handed neutrino, and sterile neutrino. No scalar flavons are considered, and the flavor symmetry is broken by the vacuum expectation value (vev) of the modulus $\tau$. For a particular set of representations of the Leptons and Higgs field, we obtain eleven (11) different models based on different modular weights of charged lepton $(k_L)$ and right-handed neutrino ($k_N$). Out of these, we consider two models, which are discriminated by carrying out the numerical analysis so that the parameter space in each model can fit the latest neutrino oscillation data at 3$\sigma$. The Planck cosmological bound on the upper limit of the sum of the active neutrino masses $\sum m_i<0.12$eV is also considered. Finally, the best-fit parameters of the neutrino observables and model predictions are evaluated using the minimum ${\chi }^2$ analysis.

   hep-phSpringer Proc.Phys.(2025)·0 citations
4. 04*

   Learning to see R-parity violating scalar top decays

   Gerrit Bickendorf🇩🇪 · Manuel Drees🇩🇪

   With this article we introduce recent, improved machine learning methods from computer vision to the problem of event classification in particle physics. Supersymmetric scalar top decays to top quarks and weak scale bino-like neutralinos, where the neutralinos decay via the $UDD$ operator to three quarks, are difficult to search for and therefore weakly constrained. The jet substructure of the boosted decay products can be used to differentiate signal from background events. We apply transformer-based computer vision models CoAtNet and MaxViT to images built from jet constituents and compare the classification performance to a more classical convolutional neural network (CNN). We find that results from computer vision translate well onto physics applications and both transformer-based models perform better than the CNN. By replacing the CNN with MaxViT we find an improvement of $S/\sqrt{B}$ by a factor of almost 2 for some neutralino masses. We show that combining this classifier with additional features results in a strong separation of background and signal. We also find that replacing a CNN with a MaxViT model in a simple mock analysis can push the 95% C.L. exclusion limit of stop masses by about $100$ GeV and $60$ GeV for neutralino masses of $100$ GeV and $500$ GeV.

   hep-phhep-exPRD(2024)·2 citations
5. 05*

   Exploring the Dark Frontier: White Dwarf-Based Constraints on Light Dark Matter

   Jia-Shu Niu🇨🇳

   In the vast expanse of our galaxy, white dwarfs (WDs) are natural sentinels, capturing the enigmatic dark matter (DM) particles that incessantly traverse their interiors. These celestial bodies provide a unique vantage point for probing interactions between DM particles and their constituents-nuclei or electrons-should such interactions exist. The captured DM particles may accumulate, undergo mutual annihilation, or be evaporated by the WD's own nuclei or electrons, thereby perturbing the standard cooling sequence predicted by stellar evolution theory. This letter reports pioneering constraints on DM-electron interactions derived from an in-depth analysis of four pulsating WDs. By leveraging the period variation rates of their pulsation modes, we delineate the following constraints: for a form factor $F(q)=1$, in the DM mass range $20\mathrm{MeV}/c^2\lesssim m_{\chi }\lesssim 80\mathrm{MeV}/c^2$ with a cross-section limit of ${\sigma }_{\chi ,e}\lesssim 10^{-56}{\mathrm{cm}}^2$; for a form factor $F(q)=(\alpha m_e{)}^2/q^2$, in a the DM mass range $20\mathrm{MeV}/c^2\lesssim m_{\chi }\lesssim 70\mathrm{MeV}/c^2$ with a limit of ${\sigma }_{\chi ,e}\lesssim 10^{-52}{\mathrm{cm}}^2$. These newly established constraints surpass current direct detection experiments by over fifteen orders of magnitude, forging a path into the uncharted territories of the DM parameter space. This work not only advances our understanding of light dark matter-electron interactions but also exemplifies the potential of WDs as important astrophysical laboratories for probing the elusive nature of DM.

   hep-phastro-ph.COastro-ph.HEastro-ph.SR0 citations
6. 06*

   Lepton flavor violating decays $Z\to l_i^{\pm }{l}_j^{\mp }$ in the B-L Supersymmetric Standard Model

   Jia-Peng Huo🇨🇳 · Xing-Xing Dong🇨🇳 · Jiao Ma🇨🇳 · Shu-Min Zhao🇨🇳 · Cai Guo🇨🇳 · Hai-Bin Zhang🇨🇳 · Jin-Lei Yang🇨🇳 · Tai-Fu Feng🇨🇳

   Lepton flavor violation (LFV) represents a clear new physics (NP) signal beyond the standard model (SM). In this paper, we study LFV decays $Z\to l_i^{\pm }{l}_j^{\mp }$ in the B-L Supersymmetric Standard Model(B-LSSM). We calculate these processes separately in the mass eigenstate basis and the electroweak interaction basis, and the latter adopt the mass insertion approximation (MIA) method. The MIA clearly shows the effect of parameters on the LFV decays $Z\to l_i^{\pm }{l}_j^{\mp }$ in the analytic level, which provides a new way for us to analyze the LFV processes. At the same time, the corresponding constraints from the LFV decays $l_j^{-}\to l_i^{-}\gamma$ and $(g-2{)}_{\mu }$ are considered to analyze the numerical results.

   hep-phJ.Phys.G(2025)·3 citations
7. 07*

   The Amaterasu particle: constraining the superheavy dark matter origin of UHECRs

   Prantik Sarmah🇮🇳 · Nayan Das🇮🇳 · Debasish Borah🇮🇳 · Sovan Chakraborty🇮🇳 · Poonam Mehta🇮🇳

   Amaterasu, the second most energetic ($244$ EeV) cosmic ray particle has been recently detected by the Telescope Array (TA) surface detector. The origin of the TA Amaterasu event is puzzling, as its arrival direction points back to a void in the local Universe, lacking conventional astrophysical ultra-high-energy (UHE) cosmic ray sources. Hence, we explore the possibility if this TA Amaterasu event could have originated from the decay of superheavy dark matter (SHDM) in the Milky Way. Such an origin also opens up multi-messenger detection channels in both UHE gamma-rays and UHE neutrinos. In this present work, using the TA Amaterasu event and the multi-messenger limits/sensitivities from various UHE telescopes, we place stringent constraints on the lifetime and mass of the SHDM. We find that the non-detection of the corresponding gamma-rays at the Pierre Auger Observatory (PAO) and the TA is in severe tension with the SHDM parameter space required to explain the TA Amaterasu event. Additionally, we extend the multi-messenger analysis to the future UHE gamma-ray and UHE neutrino telescopes such as PAO upgrade, GRAND 200k and IceCube-Gen2. We find that the bounds from the future neutrino telescopes will be able to compete with the present UHECR bounds. However, compared to the existing UHE gamma-ray bounds, the future PAO upgrade and the GRAND 200k gamma-ray detectors will improve the bounds on SHDM lifetime by at least one order of magnitude.

   hep-phastro-ph.HEPRD(2025)·16 citations
8. 08*

   Baryogenesis via QCD preheating with nonadiabatic baryon chemical potential

   Jimin Wang🇨🇳 · Xin-Ru Wang🇨🇳 · Shinya Matsuzaki🇨🇳

   The chiral phase transition in QCD can be supercooled in the thermal history of the universe to be instantaneously out-of equilibrium, if QCD is coupled to a dark QCD sector exhibiting the dark chiral phase transition of the first order. In that case the QCD sigma meson field (as the chiral order parameter, or the light quark condensate) starts to roll in a nonadiabatic way down to the true QCD vacuum. Meanwhile a dynamic baryonic chemical potential can be generated solely within QCD, which is governed by the dynamic motion of the QCD sigma meson field, analogously to the spontaneous baryogenesis or the leptogenesis via the Higgs or axionlike relaxation scenario. When QCD is further allowed to communicate with a dark fermion with mass of order of 1 GeV and the baryon number violating coupling to neutron, the nonadiabatic QCD sigma motion along with the nonadiabatic baryon chemical potential can trigger the preheating and produce the baryon number asymmetry. We discuss this scenario in details to find that the QCD-induced dynamic baryon chemical potential plays a significant role for the QCD preheating and the baryogenesis, which yields the desired amount of the asymmetry today consistently with current astrophysical, cosmological, and terrestrial experimental constraints. Cosmological and phenomenological consequences characteristic to the present scenario are also addressed.

   hep-phJHEP(2024)·3 citations
9. 09*

   Production of $B\bar{B}$ bound state via ${\rm Y}(4S)$ radiative decays

   André L. M. Britto🇧🇷 · Luciano M. Abreu🇧🇷

   Motivated by recent theoretical predictions about the existence of a $B\bar{B}$ bound state (also denoted as $X(10550)$), in this work we estimate the production of the $S$-wave $B^{+}{B}^{-}$ molecule via ${\rm Y}(4S)$ radiative decays. In particular, we make use of effective Lagrangian approach and the compositeness condition to calculate the $X(10550)$ production rate via ${\rm Y}(4S)\to \gamma X(10550)$ decays employing triangle diagrams. Our results show that the partial decay width of this reaction is of the order of $0.5-192\text{keV}$ for a respective binding energy of $1-100$ MeV, corresponding to a branching fraction of $10^{-5}-10^{-3}$. These findings suggest that the existence of the $X(10550)$ might be checked via the analysis of the mentioned decay in present and future experiments.

   hep-phPRD(2024)·2 citations
10. 10*

    Minimal U(1) two-Higgs-doublet models for quark and lepton flavour

    J. R. Rocha🇵🇹 · H. B. Câmara🇵🇹 · R. G. Felipe🇵🇹 · F. R. Joaquim🇵🇹

    In the context of the 2HDM, and assuming that neutrinos acquire masses via the Weinberg operator, we perform a systematic analysis to determine the minimal quark and lepton flavour patterns, compatible with masses, mixing and CP violation data, realisable by Abelian symmetries. We determine four minimal models for quarks, where the number of independent parameters matches the number of observables. For the lepton sector, three minimal predictive models are identified. Namely, we find scenarios with a preference for the upper/lower octant of the ${\theta }_{23}$ atmospheric mixing angle, that exhibit lower bounds on the lightest neutrino masses currently probed by cosmology and testable at future neutrinoless double beta decay experiments, even for a normally-ordered neutrino masses. We investigate the phenomenology of each model taking into account all relevant theoretical, electroweak precision observables, scalar sector constraints, as well as stringent quark flavour processes such as $\overline{B}\to X_s\gamma$, $B_s\to {\mu }^{-}{\mu }^{+}$ and meson oscillations, and the charged lepton flavour-violating decays $e_{\alpha }^{-}\to e_{\beta }^{-}{e}_{\gamma }^{+}{e}_{\delta }^{-}$ and $e_{\alpha }\to e_{\beta }\gamma$. We show that, in some cases, Abelian flavour symmetries provide a natural framework to suppress flavour-changing neutral couplings and lead to scenarios featuring heavy neutral/charged scalar masses below the TeV scale within the reach of current experiments.

    hep-phPRD(2024)·4 citations
11. 11*

    Nonlocal chiral contributions to generalized parton distributions of the proton at nonzero skewness

    Zhengyang Gao🇨🇳 · Fangcheng He🇺🇸 · Chueng-Ryong Ji🇺🇸 · W. Melnitchouk🇺🇸 · Y. Salamu🇨🇳 · P. Wang🇨🇳

    We compute the one-loop contributions to spin-averaged generalized parton distributions (GPDs) in the proton from pseudoscalar mesons with intermediate octet and decuplet baryon states at nonzero skewness. Our framework is based on nonlocal covariant chiral effective theory, with ultraviolet divergences regularized by introducing a relativistic regulator derived consistently from the nonlocal Lagrangian. Using the splitting functions calculated from the nonlocal Lagrangian, we find the nonzero skewness GPDs from meson loops by convoluting with the phenomenological pion GPD and the generalized distribution amplitude, and verify that these satisfy the correct polynomiality properties. We also compute the lowest two moments of GPDs to quantify the meson loop effects on the Dirac, Pauli and gravitational form factors of the proton.

    hep-phnucl-thPRD(2024)·6 citations
12. 12*

    The polarized photon distribution function

    Daniel de Florian🇦🇷 · Lucas Palma Conte🇦🇷 · Gabriel Fernando Volonnino🇦🇷

    We employ the LuxQED approach to compute the polarized photon PDF (photon pPDF). This approach expresses the pPDF in terms of the structure functions $g_1$ and $g_2$. Different models for the structure functions are employed according to the parameter space region. The resulting pPDF is approximately of the order of $x$ times the unpolarized PDF. The relative uncertainty in the photon pPDF reaches up to $50\%$ for $x\sim 10^{-3}$, decreasing to approximately $10\%$ for higher values of $x$. The computation of the photon pPDF will be essential for improving the precision of polarized calculations and will have fundamental implications for studies at the future Electron-Ion Collider (EIC).

    hep-phEPJC(2024)·3 citations
13. 13*

    Analysis of experimental data on neutron decay for the possibility of the existence of the right vector boson $W_R$

    A.P. Serebrov🇷🇺 · O.M. Zherebtsov🇷🇺 · A.K. Fomin🇷🇺 · R. M. Samoilov🇷🇺 · N.S. Budanov🇷🇺

    The analysis of the latest most accurate experimental data on neutron decay for the possibility of the existence of the right vector boson $W_R$ is carried out. As a result of the analysis within the framework of the left-right symmetric model, it was found that there is an indication of the existence of the right vector boson $W_R$ with a mass of $M_{W_R}=304_{-20}^{+24}\text{GeV}$, and a mixing angle with $W_L:\zeta =-0.039\pm 0.014$. It is shown that this result does not contradict the experiments at colliders to search for a hypothetical vector boson. In addition, it is shown that it is possible to describe the effects of CP violation in decays of neutral $K$-mesons, $D$-mesons and $B_s^0$ using the parameters of the extended left-right symmetric model obtained from neutron decay, i.e. squared masses of the left and right bosons ratio and the mixing angle. The formation of baryon-lepton asymmetry of the Universe is considered within the framework of the left-right model of weak interaction with CP violation. A new experimental design for measuring neutron decay asymmetries with increased accuracy is presented.

    hep-phhep-exPhys.Part.Nucl.Lett.(2025)·3 citations
14. 14*

    Energy Growth in $V_L{V}_L\to V_L{V}_L,V_L{V}_{L}h$ Scattering to Probe Higgs Cubic and HEFT Interactions

    Shameran Mahmud🇺🇸 · Kohsaku Tobioka🇺🇸

    We compute the energy scales of perturbative unitarity violation in $V_L{V}_L\to V_L{V}_{L}h$ processes and compare them to $V_L{V}_L\to hhh$ process, where $V_L$ refers to a longitudinal mode of $Z$ or $W$ boson, and $h$ the Higgs boson. Using these energy scales, we determine which process is more sensitive to potential modifications in the Higgs sector at high-energy colliders. Within the Higgs Effective Field Theory (HEFT), we consider the Higgs cubic coupling and other interactions with and without derivatives. Any HEFT interactions predict the perturbative unitarity violation at a finite scale, and in a generic case, the minimalistic process is $2\to 3$ scattering. Our analysis reveals that the energy scales for unitarity violation in $V_L{V}_L\to V_L{V}_{L}h$ and $V_L{V}_L\to hhh$ processes are similar across all scenarios considered. If the backgrounds are similar, $V_L{V}_{L}h$ final states are more feasible because $V_L{V}_{L}h$ has higher branching ratios in cleaner decay modes than $hhh$. We also investigate HEFT derivative interactions derived from various UV models. In these cases, both $V_L{V}_L\to V_L{V}_L$ and $V_L{V}_L\to hh$ processes exhibit unitarity violating behavior. We demonstrate that the energy scales for unitarity violation in $V_L{V}_L$ final states are comparable to or even lower than those in the $hh$ final state.

    hep-phhep-exJHEP(2024)·8 citations
15. 15*

    Astrometric Detection of Ultralight Dark Matter

    Jeff A. Dror🇺🇸 · Sarunas Verner🇺🇸

    Ultralight dark matter induces time-dependent perturbations in the spacetime metric, enabling its gravitational direct detection. In this work, we propose using astrometry to detect dark matter. After reviewing the calculation of the metric in the presence of scalar dark matter, we study the influence of the perturbations on the apparent motion of astrophysical bodies. We apply our results to angular position measurements of quasars, whose vast distances from Earth present an opportunity to discover dark matter with a mass as low as $10^{-33}\mathrm{eV}$. We explore the prospects of very long baseline interferometry and optical astrometric survey measurements for detecting ultralight relics, finding that for the smallest masses, current astrometric surveys can detect dark matter moving locally with a velocity of $10^{-3}$ with energy density as low as $10^{-4}\mathrm{GeV}/{\mathrm{cm}}^3$.

    hep-phastro-ph.COgr-qcPRL(2025)·15 citations
16. 16*

    $\text{Pyresias}$: How To Write a Toy Parton Shower

    Andreas Papaefstathiou🇺🇸

    The aim of this article is to provide an educational introduction to the parton shower approach used in particle physics Monte carlo event generators to simulate radiation via quantum chromodynamics. Following a description of the fundamental theoretical underpinnings, instructions on how to build a toy parton shower are given. The associated $\text{Python}$ code, along with a detailed JupyterLab notebook, are publicly available at https://github.com/apapaefs/pyresias.

    hep-phhep-ex2 citations
17. 17*

    Precise interpretations of traditional fine-tuning measures

    Andrew Fowlie🇨🇳 · Gonzalo Herrera🇺🇸

    We uncover two precise interpretations of traditional electroweak fine-tuning (FT) measures that were historically missed. (i) a statistical interpretation: the traditional FT measure shows the change in plausibility of a model in which a parameter was exchanged for the $Z$ boson mass relative to an untuned model in light of the $Z$ boson mass measurement. (ii) an information-theoretic interpretation: the traditional FT measure shows the exponential of the extra information, measured in nats, relative to an untuned model that you must supply about a parameter in order to fit the $Z$ mass. We derive the mathematical results underlying these interpretations, and explain them using examples from weak scale supersymmetry. These new interpretations allow us to rigorously define FT in particle physics and beyond; shed fresh light on the status of extensions to the Standard Model; and lastly, allow us to precisely reinterpret historical and recent studies using traditional FT measures.

    hep-phhep-thphysics.data-anPRD(2025)·6 citations
18. 18*

    Towards a Real-Time Computation of Timelike Hadronic Vacuum Polarization and Light-by-Light Scattering: Schwinger Model Tests

    João Barata🇺🇸 · Kazuki Ikeda🇺🇸 · Swagato Mukherjee🇺🇸 · Jonathan Raghoonanan🇺🇸

    Hadronic vacuum polarization (HVP) and light-by-light scattering (HLBL) are crucial for evaluating the Standard Model predictions concerning the muon's anomalous magnetic moment. However, direct first-principle lattice gauge theory-based calculations of these observables in the timelike region remain challenging. Discrepancies persist between lattice quantum chromodynamics (QCD) calculations in the spacelike region and dispersive approaches relying on experimental data parametrization from the timelike region. Here, we introduce a methodology employing 1+1-dimensional quantum electrodynamics (QED), i.e. the Schwinger Model, to investigate the HVP and HLBL. To that end, we use both tensor network techniques, specifically matrix product states, and classical emulators of digital quantum computers. Demonstrating feasibility in a simplified model, our approach sets the stage for future endeavors leveraging digital quantum computers.

    hep-phhep-latquant-phJHEP(2025)·13 citations
19. 19*

    Astrometric Search for Ultralight Dark Matter

    Hyungjin Kim🇩🇪

    Precision astrometry offers a way to probe new physics. By measuring the angular position of light sources at unprecedented precision, astrometry could probe minuscule fluctuations of underlying spacetime. This work explores the possibility of probing ultralight dark matter candidates using precision astrometry. Through the coherent and stochastic density fluctuations over the scale of its wavelength, ultralight dark matter perturbs the propagation of light and the geodesics of the observer and source, leading to unique time-dependent signatures in the angular position of background light sources. With detector specifications similar to the current and future astrometry observations, such as Gaia and Roman Space Telescope, it is shown that the ultralight scalar dark matter of mass $10^{-18}\mathrm{eV}\text{–}10^{-16}\mathrm{eV}$ could be probed when its density near the solar system is about a few thousand times larger than the nominal dark matter density measured on a much larger kpc-scale. This sensitivity is comparable to current pulsar timing array observations at a similar mass range. Explicit expressions for the angular deflection induced by most generic metric perturbations are derived and its gauge invariance is explicitly checked at the linear order.

    hep-phastro-ph.COastro-ph.GAPRD(2024)·24 citations
20. 20*

    Recursion for Wilson-line Form Factors

    Timothy Cohen🇨🇭 · Marc Riembau🇨🇭

    Matrix elements of Wilson-line dressed operators play a central role in the factorization of soft and collinear modes in gauge theories. When expressed using spinor helicity variables, these so-called form factors admit a classification starting from a Maximally Helicity Violating configuration, in close analogy with gauge theory amplitudes. We show that a single-line complex momentum shift can be used to derive recursion relations that efficiently compute these helicity form factors at tree-level: a combination of lower point form factors and on-shell amplitudes serve as the input building blocks. We obtain novel compact expressions for the $1\to 2$ and $1\to 3$ splitting functions in QCD, which also serves to validate our methods.

    hep-phhep-thJHEP(2024)·3 citations
21. 21*

    Dark magnetohydrodynamics: Black hole accretion in superradiant dark photon clouds

    Shuo Xin🇺🇸 · Elias R. Most🇺🇸

    Black holes threaded by massive vector fields can be subject to a superradiant instability, growing a cloud of massive vector particles around it. In this work, we consider what happens if such a dark matter candidate field mimicking a dark photon interacts with an accretion flow onto the black hole. By including a kinetic mixing term with the standard model photon, we extend the commonly used equations of general-relativistic magnetohydrodynamics to a dark photon constituent. The coupling to the dark photon then appears as an effective dynamo term together with a dark Lorentz force acting on the accreting matter. We numerically study the interactions between the superradiant dark photon cloud and the inner accretion flow by solving the coupled system in full numerical relativity. By parameterically varying the mixing parameter between dark and standard model sector, we provide a first investigation of how the accretion flow could be modified. Depending on the coupling strength, our solutions exhibit increased wind launching, as well as oscillation modes in the disk.

    ↳ astro-ph.HEgr-qchep-phPRD(2025)·11 citations
22. 22*

    Strange Dwarfs: a review on the (in)stability

    Francesco Di Clemente🇮🇹 · Alessandro Drago🇮🇹 · Giuseppe Pagliara🇮🇹

    White dwarfs are the remnants of stars not massive enough to become supernovae. This review explores the concept of strange dwarfs, a unique class of white dwarfs which contain cores of strange quark matter. Strange dwarfs have different sizes, masses, and evolutionary paths with respect to white dwarfs. They might form through the accumulation of normal matter on strange quark stars or by capture of strangelets. The stability of strange dwarfs has been debated, with initial studies suggesting stability, while later analyses indicated potential instability. This review revisits these discussions, focusing on the critical role of boundary conditions between nuclear and quark matter in determining stability. It also offers insights into their formation, structure, and possible detection in the universe.

    ↳ astro-ph.SRastro-ph.HEhep-phnucl-thUniverse(2024)·5 citations
23. 23*

    Study of hybrid stars with nonstrange quark matter cores

    Cheng-Ming Li🇨🇳 · He-Rui Zheng🇨🇳 · Shu-Yu Zuo🇨🇳 · Ya-Peng Zhao🇨🇳 · Fei Wang🇨🇳 · Yong-Feng Huang🇨🇳

    In this work, under the hypothesis that quark matter may not be strange (Holdom et al. 2018), we adopt a modification of the coupling constant of the four-quark scalar interaction $G\to G_1+G_2⟨\bar{\psi }\psi ⟩$ in the 2-flavor Nambu-Jona-Lasinio (NJL) model to study nonstrange hybrid stars, where $G_1$ and $G_2$ are two parameters constrained by using the lattice QCD simulation results at the critical temperature and zero chemical potential. The Maxwell construction is used to describe the first-order confinement-deconfinement phase transition in hybrid stars. With recent measurements on neutron star mass, radius, and tidal deformability, the hybrid equation of states are constrained. It is found that pure nonstrange quark matter cores can exist in hybrid stars, possessing $0.026-0.04$ solar mass. The maximum hybrid star mass in the framework of the modified NJL model is about 0.1 solar mass lighter than that in the conventional 2-flavor NJL model. It is argued that the binary neutron stars in GW170817 should be hadron stars.

    ↳ nucl-thhep-phApJ(2025)·5 citations
24. 24*

    Holographic drag force with translational symmetry breaking

    Sara Tahery🇨🇳 · Kazem Bitaghsir Fadafan🇮🇷 · Sahar Mojarrad Lamanjouei🇮🇷

    In order to investigate how the drag force is affected by translational symmetry breaking (TSB), we utilize a holographic model in which the background metric remains translational symmetric while a graviton mass or other fields in the theory break this symmetry. We calculate analytically the drag force, considering an asymptotic $Ad{S}_5$ in which parameter {\alpha} arises from TSB. This parameter can be intuitively understood as a measure of TSB strength and we anticipate that non-zero values of it will affect the drag force. In this asymptotic AdS5 background, we will demonstrate that a decrease in {\alpha} results in a reduction of the drag force. Moreover, we study the diffusion constant, which falls with increasing {\alpha}. It will eventually be shown that at lower values of {\alpha} or {\mu} (chemical potential), the transverse diffusion coefficient is larger than the longitudinal one, and the speed of the heavy quark has minimal impact on the ratio.

    ↳ hep-thhep-phEPJC(2024)·1 citation
25. 25*

    Inhomogeneous SU(2) gluon matter under rotation

    Yin Jiang🇨🇳

    In this work a rotating SU(2) gluon system have been studied with the dyon ensemble in dilute limit. By solving the rotation-modified Yang-Mills equation we have obtained rotational corrections to the so-called dyon solutions with arbitrary centers to $\mathcal{O}({\omega }^2)$ order and the corresponding semi-classical potential. The radial position dependent deconfinement temperature have been obtained by minimizing the semi-classical potential in both real and imaginary angular velocity cases. Although without the $\omega$-dependent coupling constant the critical temperature behaves different from the lattice simulation at each radial position as the rotation goes faster, its radial dependence is qualitatively the same as the lattice. That is in the real velocity case the outer layer will deconfine more difficult while the reverse is true in the imaginary velocity case.

    ↳ nucl-thhep-phhep-thPRD(2024)·12 citations

* Reconstructed cohort: no mailing for this day survives in the archive. Papers are grouped by their submission times and arXiv's announcement cut-off, assuming announcement without delay; positions follow identifier order. Validated at ~91% exact-day agreement against the archived era.