Wed·Jan 24, 2024Wednesday·January 24, 2024

1. 01*

   New Physics couplings from angular coefficient functions of $\bar{B}\to D^{\ast }(D\pi )\ell {\bar{\nu }}_{\ell }$

   Pietro Colangelo🇮🇹 · Fulvia De Fazio🇮🇹 · Francesco Loparco🇮🇹 · Nicola Losacco🇮🇹

   The Belle Collaboration has recently measured the complete set of angular coefficient functions for the exclusive decays $\bar{B}\to D^{\ast }(D\pi )\ell {\bar{\nu }}_{\ell }$, with $\ell =e,\mu$, in four bins of the parameter $w=\frac{m_B^2+m_{D^{\ast }}^2-q^2}{2m_B{m}_{D^{\ast }}}$, with $q$ the lepton pair momentum. Under the assumption that physics beyond the Standard Model does not contribute to such modes, the measurements are useful to determine the hadronic form factors describing the $B\to D^{\ast }$ matrix elements of the Standard Model weak current, and to improve the determination of $|V_{cb}|$. On the other hand, they can be used to assess the impact of possible new physics contributions. In a bottom-up approach, we extend the Standard Model effective Hamiltonian governing this mode with the inclusion of the full set of Lorentz invariant d=6 operators compatible with the gauge symmetry of the theory. The measured angular coefficient functions can tightly constrain the couplings in the generalized Hamiltonian. We present the first results of this analysis, discussing how improvements can be achieved when more complete data on the angular coefficient functions will be available.

   hep-phhep-exhep-latPRD(2024)·14 citations
2. 02*

   Scale Invariant Extension of the Standard Model: A Nightmare Scenario in Cosmology

   Mayumi Aoki🇯🇵 · Jisuke Kubo🇩🇪 · Jinbo Yang🇨🇳

   Inflationary observables of a classically scale invariant model, in which the origin of the Planck mass and the electroweak scale including the right-handed neutrino mass is chiral symmetry breaking in a QCD-like hidden sector, are studied. Despite a three-field inflation the initial-value-dependence is strongly suppressed thanks to a river-valley like potential. The model predicts the tensor-to-scalar ratio $r$ of cosmological perturbations smaller than that of the $R^2$ inflation, i.e., $0.0044\text{gsim}r\text{gsim}0.0017$ for e-foldings between $50$ and $60$: The model will be consistent even with a null detection at LiteBird/CMB-S4. We find that the non-Gaussianity parameter $f_{NL}$ is $O(10^{-2})$, the same size as that of single-field inflation. The dark matter particles are the lightest Nambu-Goldstone bosons associated with chiral symmetry breaking, which are decay products of one of the inflatons and are heavier than $10^9$ GeV with a strongly suppressed coupling with the standard model, implying that the dark matter will be unobservable in direct as well as indirect measurements.

   hep-phJCAP(2024)·9 citations
3. 03*

   The $B_c$ meson and its scalar cousin with the QCD sum rules

   Zhi-Gang Wang🇨🇳

   In the present work, we use optical theorem to calculate the next-to-leading order corrections to the QCD spectral densities directly in the QCD sum rules for the pseudoscalar and scalar $B_c$ mesons. We take the experimental data as guides to perform updated analysis, and obtain the masses and decay constants, especially the decay constants, which are the fundamental input parameters in the high energy physics, therefore the pure leptonic decay widths, which can be confronted to the experimental data in the future.

   hep-phCPC(2024)·22 citations
4. 04*

   Development of the fully Geant4 compatible package for the simulation of Dark Matter in fixed target experiments

   B. Banto Oberhauser🇨🇭 · P. Bisio🇮🇹 · A. Celentano🇮🇹 · E. Depero🇨🇭 · R. R. Dusaev🇷🇺 · D. V. Kirpichnikov🇷🇺 · M. M. Kirsanov🇷🇺 · N. V. Krasnikov🇷🇺 · A. Marini🇮🇹 · L. Marsicano🇮🇹 · L. Molina-Bueno🇪🇸 · M. Mongillo🇨🇭 and 3 other authors

   The search for new comparably light (well below the electroweak scale) feebly interacting particles is an exciting possibility to explain some mysterious phenomena in physics, among them the origin of Dark Matter. The sensitivity study through detailed simulation of projected experiments is a key point in estimating their potential for discovery. Several years ago we created the DMG4 package for the simulation of DM (Dark Matter) particles in fixed target experiments. The natural approach is to integrate this simulation into the same program that performs the full simulation of particles in the experiment setup. The Geant4 toolkit framework was chosen as the most popular and versatile solution nowadays. The simulation of DM particles production by this package accommodates several possible scenarios, employing electron, muon or photon beams and involving various mediators, such as vector, axial vector, scalar, pseudoscalar, or spin 2 particles. The bremsstrahlung, annihilation or Primakoff processes can be simulated. The package DMG4 contains a subpackage DarkMatter with cross section methods weakly connected to Geant4. It can be used in different frameworks. In this paper, we present the latest developments of the package, such as extending the list of possible mediator particle types, refining formulas for the simulation and extending the mediator mass range. The user interface is also made more flexible and convenient. In this work, we also demonstrate the usage of the package, the improvements in the simulation accuracy and some cross check validations.

   hep-phComput.Phys.Commun.(2024)·16 citations
5. 05*

   Analysis of the isospin eigenstate $\bar{D}{\Sigma }_c$, ${\bar{D}}^{\ast }{\Sigma }_c$, and $\bar{D}{\Sigma }_c^{\ast }$ pentaquarks by their electromagnetic properties

   U. Özdem🇹🇷

   To shed light on the nature of the controversial and not yet fully understood exotic states, we are carrying out a systematic study of their electromagnetic properties. The magnetic moment of a hadron state is as fundamental a dynamical quantity as its mass and contains valuable information on the deep underlying structure. In this study, we use the QCD light-cone sum rule to extract the magnetic moments of the ${\mathrm{P}}_{\mathrm{c}}(4312)$, ${\mathrm{P}}_{\mathrm{c}}(4380)$, and ${\mathrm{P}}_{\mathrm{c}}(4440)$ pentaquarks by considering them as the molecular picture with spin-parity ${\mathrm{J}}^{\mathrm{P}}={\frac{1}{2}}^{-}$, ${\mathrm{J}}^{\mathrm{P}}={\frac{3}{2}}^{-}$, and ${\mathrm{J}}^{\mathrm{P}}={\frac{3}{2}}^{-}$, respectively. We define the isospin of the interpolating currents of these states, which is the key to solving the puzzle of the hidden-charm pentaquark states, to make these analyses more precise and reliable. We have compared our results with other theoretical predictions that could be a useful complementary tool for the interpretation of the hidden-charm pentaquark sector, and we observe that they are not in mutual agreement with each other. We have also calculated higher multipole moments for spin-3/2 ${\bar{D}}^{\ast }{\Sigma }_c$ and $\bar{D}{\Sigma }_c^{\ast }$ pentaquarks, indicating a non-spherical charge distribution.

   hep-phhep-exhep-latEPJC(2024)·22 citations
6. 06*

   FeynGame-2.1 -- Feynman diagrams made easy

   Robert Harlander🇩🇪 · Sven Yannick Klein🇩🇪 · Magnus Schaaf🇩🇪

   FeynGame is an open-source software tool to draw Feynman diagrams, but also to get acquainted with their structure. This article reports on a number of new features which have been added to FeynGame since its first release. These include full support of LaTeX for the line and vertex labels, the possibility to automatically include momentum arrows, new graphical elements, and new pedagogical features. FeynGame is freely available as jar or MacOS app file from https://web.physik.rwth-aachen.de/user/harlander/software/feyngame, and as source code from https://gitlab.com/feyngame/FeynGame.

   hep-phphysics.ed-phPoS(2024)·38 citations
7. 07*

   Light-cone and quasi generalized parton distributions in the 't Hooft model

   Yu Jia🇨🇳 · Zhewen Mo🇨🇳 · Xiaonu Xiong🇨🇳 · Rui Yu🇨🇳

   We present a comprehensive study of the light-cone generalized parton distribution (GPD) and quasi-GPD of a flavor-neutral meson in the 't Hooft model, {\it i.e.}, two-dimensional QCD (\QCDtw) in the $N_c\to \infty$ limit. With the aid of the Hamiltonian approach, we construct the light-cone GPD in terms of the meson's light-cone wave function in the framework of light-front quantization, and express the quasi-GPD in terms of the meson's Bars-Green wave functions and the chiral angle in the framework of equal-time quantization. We show that, both analytically and numerically, the quasi-GPD does approach the light-cone GPD when the meson is boosted to the infinite momentum frame, which justifies the tenet underlying the large momentum effective theory for the off-forward parton distribution. Upon taking the forward limit, the light-cone and quasi-GPDs reduce to the light-cone and quasi-PDFs. As a bonus, we take this chance to correct the incomplete expression of the quasi-PDFs in the 't Hooft model reported in our preceding work [Y. Jia et al. Phys. Rev. D 98, 054011 (2018)].

   hep-phPRD(2024)·5 citations
8. 08*

   A non-unitary solar constraint for long-baseline neutrino experiments

   Andres Lopez Moreno🇬🇧

   Long-baseline neutrino oscillation experiments require external constraints on ${\sin }^2{\theta }_{12}$ and $\Delta m_{21}^2$ to make precision measurements of the leptonic mixing matrix. These constraints come from measurements of the Mikheyev-Smirnov-Wolfenstein (MSW) mixing in solar neutrinos. Here we develop an MSW large mixing angle approximation in the presence of heavy neutral leptons which adds a single new parameter (${\alpha }_{11}$) representing the magnitude of the mixing between the ${\nu }_e$ state and the heavy sector. We use data from the Borexino, SNO and KamLAND collaborations to find a solar constraint appropriate for heavy neutral lepton searches in long-baseline oscillation experiments. Solar data limits the magnitude of the non-unitary parameter to $(1-{\alpha }_{11})<0.046$ at the $99\%$ credible interval and yields a strongly correlated constraint on the solar mass splitting and the magnitude of ${\nu }_e$ non-unitary mixing.

   hep-phPRD(2026)·5 citations
9. 09*

   Understanding Gravitational Form Factors with the Weizsäcker-Williams Method

   Yoshikazu Hagiwara🇨🇳 · Xuan-Bo Tong🇫🇮 · Bo-Wen Xiao🇨🇳

   Understanding the internal structure of nucleons and nuclei has been a topic of enduring interest in high-energy physics. Gravitational form factors (GFFs) provide an important portal for us to probe the energy-momentum/mass distribution of nucleons and nuclei. This letter presents the study of the photon and gluon momentum GFFs, also known as the A-GFFs, of relativistic hadrons using the Weizsäcker-Williams method. To begin, we express the photon A-GFFs in terms of charge form factors and discuss the corresponding photon radius. Furthermore, an integral relation between the gluon A-GFF and the Laplacian of dipole scattering amplitude is derived in the small-$x$ framework, and it allows us to unravel the gluon energy momentum distribution inside hadrons through measurements at the upcoming Electron-Ion Collider. In addition, we generalize the analysis to study the A-GFF of nuclei and propose employing the nuclear gluon mean square radius, together with the charge distribution, to constrain the neutron distribution for large nuclei. This work provides an interesting perspective into the fundamental structure of high-energy hadrons.

   hep-phnucl-exnucl-thPRD(2025)·17 citations
10. 10*

    Optimization and Stabilization of Functional Renormalization Group Flows

    Niklas Zorbach🇩🇪 · Jonas Stoll🇩🇪 · Jens Braun🇩🇪

    We revisit optimization of functional renormalization group flows by analyzing regularized loop integrals. This leads us to a principle, the Principle of Strongest Singularity, and a corresponding order relation which allows to order existing regularization schemes with respect to the stability of renormalization group flows. Moreover, the order relation can be used to construct new regulators in a systematic fashion. For studies of critical behavior, which require to follow renormalization group flows down to the deep infrared regime, such new regulators may turn out to be particularly useful. The general application of this principle is demonstrated with the aid of a scalar field theory which is solved over a wide range of scales with novel methods borrowed from numerical fluid dynamics.

    hep-phhep-thnucl-thPRD(2025)·18 citations
11. 11*

    Di-electron production at the LHC: Unravelling virtual-photon and heavy-flavour contributions

    Anton Andronic🇩🇪 · Tomáš Ježo🇩🇪 · Michael Klasen🇩🇪 · Christian Klein-Bösing🇩🇪 · Alexander Puck Neuwirth🇩🇪

    The production of virtual photons is a very sensitive probe of the properties of the quark-gluon plasma. As they are experimentally detected by lepton pairs, they suffer from a large background arising from hadron decays. Light-flavour hadrons dominate at low invariant masses below $m_{ee}\sim 0.5$ GeV and heavy flavours above. These contributions must therefore also be taken into account in experimental analyses at the LHC. In this paper, we calculate the direct contribution from virtual photons produced in the Drell-Yan process with an additional jet in POWHEG and find that it is significant at low invariant masses. We also simulate the background contributions from $c\bar{c}$ and $b\bar{b}$ production with POWHEG and quantify the theoretical uncertainties due to variations of the perturbative scales and parton distribution functions. We find larger relative and absolute uncertainties for the lighter $c$ quarks than for heavier $b$ quarks.

    hep-phJHEP(2024)·5 citations
12. 12*

    NICA prospects in searches for light exotics from hidden sectors: the cases of hidden photons and axion-like particles

    Dmitry Gorbunov🇷🇺 · Dmitry Kalashnikov🇷🇺

    We present first estimates of NICA sensitivity to Standard Model extensions with light hypothetical particles singlet under the known gauge transformations. Our analysis reveals that NICA can explore new regions in the parameter spaces of models with a hidden vector and models with an axion-like particle of masses about 30-500\,MeV. Some of these regions seem unreachable by other ongoing and approved future projects. NICA has good prospects in discovery ($5\sigma$) of the new physics after 1 year of data taking.

    hep-phPLB(2024)·5 citations
13. 13*

    Light vector bosons and the weak mixing angle in the light of future germanium-based reactor CE$\nu$NS experiments

    Manfred Lindner🇩🇪 · Thomas Rink🇩🇪 · Manibrata Sen🇩🇪

    In this work, the sensitivity of future germanium-based reactor neutrino experiments to the weak mixing angle ${\sin }^2{\theta }_W$, and to the presence of new light vector bosons is investigated. By taking into account key experimental features with their uncertainties and the application of a data-driven and state-of-the-art reactor antineutrino spectrum, the impact of detection threshold and experimental exposure is assessed in detail for an experiment relying on germanium semiconductor detectors. With the established analysis framework, the precision on the Weinberg angle, and capability of probing the parameter space of a universally coupled mediator model, as well as a U(1)${}_{\mathrm{B}-\mathrm{L}}$-symmetric model are quantified. Our investigation finds the next-generation of germanium-based reactor neutrino experiments in good shape to determine the Weinberg angle ${\sin }^2{\theta }_W$ with $<10$ % precision using the low-energetic neutrino channel of CE$\nu$NS. In addition, the current limits on new light vector bosons determined by reactor experiments can be lowered by about an order of magnitude via the combination of both CE$\nu$NS and E$\nu$eS. Consequently, our findings provide strong phenomenological support for future experimental endeavours close to a reactor site.

    hep-phhep-exJHEP(2024)·16 citations
14. 14*

    Global Portraits of Nonminimal Inflation: Metric and Palatini

    Laur Järv🇪🇪 · Sotirios Karamitsos🇬🇷 · Margus Saal🇪🇪

    In this paper, we study the global phase space dynamics of single nonminimally coupled scalar field inflation models in the metric and Palatini formalisms. Working in the Jordan frame, we derive the scalar-tensor general field equations and flat FLRW cosmological equations, and present the Palatini and metric equations in a common framework. We show that inflation is characterized by a "master" trajectory from a saddle-type de Sitter fixed point to a stable node fixed point, approximated by slow roll conditions (presented for the first time in the Palatini formalism). We show that, despite different underlying equations, the fixed point structure and properties of many models are congruent in metric and Palatini, which explains their qualitative similarities and their suitability for driving inflation. On the other hand, the global phase portraits reveal how even models which predict the same values for observable perturbations differ, both to the extent of the phase space physically available to their trajectories, as well as their past asymptotic states. We also note how the slow roll conditions tend to underestimate the end of inflationary accelerated expansion experienced by the true nonlinear "master" solution. The explicit examples we consider range from the metric and Palatini induced gravity quintic potential with a Coleman-Weinberg correction factor to Starobinsky, metric and Palatini nonminimal Higgs, second order pole, and several nontrivial Palatini models.

    ↳ gr-qchep-phPRD(2024)·15 citations
15. 15*

    Exploring magnetic fluctuations effects in QED gauge fields: implications for mass generation

    Jorge David Castaño-Yepes🇨🇱 · Enrique Muñoz🇨🇱

    In this work, we calculate the one-loop contribution to the polarization tensor for photons (and gluons) in the presence of a classical background magnetic field with white-noise stochastic fluctuations. The magnetic field fluctuations are incorporated into the fermion propagator in a quasi-particle picture, which we developed in previous works using the {\it replica trick}. By focusing on the strong-field limit, here we explicitly calculate the polarization tensor. Our results reveal that it does not satisfy the transversality conditions outlined by the Ward identity, thus breaking the $U(1)$ symmetry. As a consequence, in the limit of vanishing photon four-momenta, the tensor coefficients indicate the emergence of an effective magnetic mass induced on photons (and gluons) by these stochastic fluctuations, leading to the interpretation of a dispersive medium with a noise-dependent index of refraction.

    ↳ hep-thhep-phPRD(2024)·14 citations
16. 16*

    Universal relations for anisotropic interacting quark stars

    Juan M. Z. Pretel🇧🇷 · Chen Zhang🇨🇳

    Interacting quark stars, which are entirely composed of interacting quark matter including perturbative QCD corrections and color superconductivity, can meet constraints from various pulsar observations. In realistic scenarios, pressure anisotropies are expected in the star's interior. Recently, the stellar structural properties of anisotropic interacting quark stars have been investigated. In this study, we further explore the universal relations (URs) related to the moment of inertia $I$, tidal deformability $\Lambda$, compactness $C$, and the $f$-mode nonradial pulsation frequency for such stars. Our results reveal that these approximate URs generally hold, being insensitive to both the EOS variations as well as to the presence of anisotropy. In contrast to previous studies on anisotropic neutron stars, we find that more positive anisotropy tends to enhance the $I-\Lambda$ and $I-C$ URs, but weakens the $C-\Lambda$ UR. For all the URs involving $f$-mode frequency, we find that they are enhanced by the inclusion of anisotropy (whether positive or negative). Utilizing these URs and the tidal deformability constraint from the GW170817 event, we put limits on the structural properties of isotropic and anisotropic quark stars, such as the moment of inertia $I_{1.4}$, the canonical radius $R_{1.4}$ and the canonical $f$-mode frequency $f_{f,1.4}$, all of which are very different compared to those of neutron stars.

    ↳ nucl-thastro-ph.HEgr-qchep-phJCAP(2024)·21 citations
17. 17*

    Negative cosmological constant in the dark energy sector: tests from JWST photometric and spectroscopic observations of high-redshift galaxies

    Nicola Menci🇮🇹 · Shahnawaz A. Adil🇮🇳 · Upala Mukhopadhyay🇮🇳 · Anjan A. Sen🇮🇳 · Sunny Vagnozzi🇮🇹

    Early observations with the James Webb Space Telescope (JWST) have revealed the existence of an unexpectedly large abundance of extremely massive galaxies at redshifts $z\gtrsim 5$: these observations are in tension with the predictions not only of the standard $\Lambda$CDM cosmology, but also with those of a wide class of dynamical dark energy (DE) models, and are generally in better agreement with models characterized by a phantom behaviour. Here we consider a model, inspired by string theory and the ubiquity of anti-de Sitter vacua therein, featuring an evolving DE component with positive energy density on top of a negative cosmological constant, argued in an earlier exploratory analysis to potentially be able to explain the JWST observations. We perform a robust comparison of this model against JWST data, considering both photometric observations from the CEERS program, and spectroscopic observations from the FRESCO survey. We show that the model is able to accommodate the JWST observations, with a consistency probability of up to $98\%$, even in the presence of an evolving component with a quintessence-like behaviour (easier to accommodate theoretically compared to phantom DE), while remaining consistent with standard low-redshift probes. Our results showcase the tremendous potential of measurements of high-redshift galaxy abundances in tests of fundamental physics, and their valuable complementarity with standard cosmological probes.

    ↳ astro-ph.COgr-qchep-phhep-thJCAP(2024)·88 citations
18. 18*

    Uncertainty quantification in the machine-learning inference from neutron star probability distribution to the equation of state

    Yuki Fujimoto🇺🇸 · Kenji Fukushima🇯🇵 · Syo Kamata🇯🇵 · Koichi Murase🇯🇵

    We discuss the machine-learning inference and uncertainty quantification for the equation of state (EoS) of the neutron star (NS) matter directly using the NS probability distribution from the observations. We previously proposed a prescription for uncertainty quantification based on ensemble learning by evaluating output variance from independently trained models. We adopt a different principle for uncertainty quantification to confirm the reliability of our previous results. To this end, we carry out the MC sampling of data to infer an EoS and take the convolution with the probability distribution of the observational data. In this newly proposed method, we can deal with arbitrary probability distribution not relying on the Gaussian approximation. We incorporate observational data from the recent multimessenger sources including precise mass measurements and radius measurements. We also quantify the importance of data augmentation and the effects of prior dependence.

    ↳ nucl-thastro-ph.HEhep-phPRD(2024)·41 citations
19. 19*

    Modern nuclear and astrophysical constraints of dense matter in a renormalized chiral approach

    Rajesh Kumar🇺🇸 · Yuhan Wang🇺🇸 · Nikolas Cruz Camacho🇺🇸 · Arvind Kumar🇮🇳 · Jacquelyn Noronha-Hostler🇺🇸 · Veronica Dexheimer🇺🇸

    We explore the Quantum Chromodynamics (QCD) phase diagram's complexities, including quark deconfinement transitions, liquid-gas phase changes, and critical points, using the chiral mean-field (CMF) model that is able to capture all these features. We introduce a vector meson renormalization within the CMF framework, enabling precise adjustments of meson masses and coupling strengths related to vector meson interactions. Performing a new fit to the deconfinement potential, we are able to replicate recent lattice QCD results, low energy nuclear physics properties, neutron star observational data, and key phase diagram features as per modern constraints. This approach enhances our understanding of vector mesons' roles in mediating nuclear interactions and their impact on the equation of state, contributing to a more comprehensive understanding of the QCD phase diagram and its implications for nuclear and astrophysical phenomena.

    ↳ nucl-thastro-ph.HEhep-phPRD(2024)·17 citations
20. 20*

    Non-Gaussianity consistency relations and their consequences for the peaks

    Mohammad Hossein Namjoo🇮🇷 · Bahar Nikbakht🇮🇷

    Strong deviations from scale invariance and the appearance of high peaks in the primordial power spectrum have been extensively studied for generating primordial black holes (PBHs) or gravitational waves (GWs). It is also well-known that the effect of non-linearities can be significant in both phenomena. In this paper, we advocate the existence of a general single-field consistency relation that relates the amplitude of non-Gaussianity in the squeezed limit $f_{\text{NL}}$ to the power spectrum and remains valid when almost all other consistency relations are violated. In particular, it is suitable for studying scenarios where scale invariance is strongly violated. We discuss the general and model-independent consequences of the consistency relation on the behavior of $f_{\text{NL}}$ at different scales. Specifically, we study the size, sign and slope of $f_{\text{NL}}$ at the scales where the power spectrum peaks and argue that generally the peaks of $f_{\text{NL}}$ and the power spectrum occur at different scales. As an implication of our results, we argue that non-linearities can shift or extend the range of scales responsible for the production of PBHs or GWs, relative to the window as determined by the largest peak of the power spectrum, and may also open up new windows for both phenomena.

    ↳ astro-ph.COhep-phhep-thJCAP(2024)·13 citations
21. 21*

    Framework for the Quantum Mechanical Sum of Possibilities and Meaning for Field Theory and Gravity

    Artem Averin🇩🇪

    In quantum mechanics, the measureable quantities of a given theory are predicted by performing a weighted sum over possibilities. We show how to arrange the possibilities into bundles such that the associated subsums can be viewed as well-defined theories on their own right. These bundles are submani$\text{folds}$ of $\text{possi}$bilities which we call possifolds. We collect and prove some basic facts about possifolds. Especially, we show that possifolds are ensembles of what in a certain broadly defined sense that we explain can be regarded as soliton excitations (soliton-possifold correspondence). We provide an outlook on some applications. Among other things, we illustrate the use of the developed framework for the example of the Lieb-Liniger model. It describes non-relativistic bosons with an attractive interaction. We derive a dual theory describing the lowest-lying energy excitation modes. While the standard Bogoliubov-approximation breaks down at the critical point, our derived summation prescription stays regular. In the Bogoliubov-limit we observe the summation to possess an enhanced symmetry at this point while the summation cannot be ignored there. We finally provide a glimpse on the restrictions black hole physics implies in this context for the gravitational path integral.

    ↳ hep-thgr-qchep-phPRD(2025)·3 citations
22. 22*

    Analysis of BOSS Galaxy Data with Weighted Skew-Spectra

    Shu-Fan Chen🇺🇸 · Priyesh Chakraborty🇺🇸 · Cora Dvorkin🇺🇸

    We present the first application of the weighted skew-spectra to analyze non-Gaussian information in galaxy survey data. Using the tree-level galaxy skew-spectra together with the one-loop power spectrum multipoles, we analyze the Sloan Digital Sky Survey (SDSS)-III Baryon Oscillation Spectroscopic Survey (BOSS) galaxy clustering data, and target our search towards the equilateral bispectrum shape of primordial non-Gaussianity. We use the Effective Field Theory model for the galaxy power spectrum and bispectrum, and account for systematic effects, such as the survey geometry. From our likelihood analysis, we find $f_{\mathrm{NL}}^{\mathrm{equil}}=-34_{-334}^{+296}$ at $68\%$ CL, consistent with previous works, while systematic errors from our treatment of the survey geometry lead to an unreliable estimation of $f_{\mathrm{NL}}^{\mathrm{ortho}}$. We further constrain the bias and counterterm parameters, while keeping the cosmology fixed to $\text{Planck }2018$ values. As a check, we also validate our analysis pipeline using the $\mathtt{Nseries}$ simulation suite.

    ↳ astro-ph.COgr-qchep-phJCAP(2024)·16 citations
23. 23*

    Ejecta-circumstellar medium interaction in high-density environment contribution to kilonova emission: Application to GRB 191019A

    Suo-Ning Wang · Hou-Jun Lü🇨🇳 · Yong Yuan🇨🇳 · Hao-Yu Yuan🇨🇳 · Jared Rice🇺🇸 · Meng-Hua Chen🇨🇳 · En-Wei Liang🇨🇳

    The nearby long-duration GRB 191019A recently detected by Swift lacks an associated supernova and belongs to a host galaxy with little star formation activity, suggesting that the origin of this burst is the result of a merger of two compact objects with dynamical interactions in a high-density medium of an active galactic nucleus. Given the potential motivation of this event, and given that it occurs in such a high-density environment, the ejecta-circumstellar medium (CSM) interaction cannot be ignored as possibly contributing to the kilonova emission. Here, we theoretically calculate the kilonova emission by considering the contribution of the ejecta-CSM interaction in a high-density environment. We find that the contribution to the kilonova emission from the ejecta-CSM interaction will dominate at a later time, and a smaller ejecta mass will have a stronger kilonova emission from the ejecta-CSM interaction. Moreover, we try to apply it to GRB 191019A, but we find that it is difficult to identify the possible kilonova emission from the observations, due to the contribution of the bright host galaxy. On the other hand, less injected mass (less than $M_{\mathrm{ej}}=2\times 10^{-5}{M}_{\odot }$) will be required if one can detect the kilonova emission associated with a GRB 191019A-like event in the future. The {\em r}-process-powered and spin energy contributions from the magnetar are also discussed.

    ↳ astro-ph.HEhep-phApJ(2024)·7 citations
24. 24*

    Constraining the mass of fermionic dark matter from its feeble interaction with hadronic matter via dark mediators in neutron stars

    Atanu Guha🇰🇷 · Debashree Sen🇰🇷

    Considering ten well-known relativistic mean field models, we invoke feeble interaction between hadronic matter and fermionic dark matter (DM) $\chi$ via new physics scalar ($\varphi$) and vector ($\xi$) mediators in neutron star core, thereby forming DM admixed neutron stars (DMANSs). The chosen masses of the DM fermion ($m_{\chi }$) and the mediators ($m_{\varphi }$ and $m_{\xi }$) are consistent with the self-interaction constraint from Bullet cluster while their respective couplings ($y_{\varphi }$ and $y_{\xi }$) are also constrained by the present day relic abundance. Assuming that both $\varphi$ and $\xi$ contribute equally to the relic abundance, we compute the equation of state of the DMANSs and consequently their structural properties. We found that for a particular (constant) DM density, the presence of lighter DM results in more massive DMANSs with larger radius. In the light of the various recent constraints like those from the massive pulsar PSR J0740+6620, the gravitational wave (GW170817) data and the results of NICER experiments for PSR J0030+0451 and PSR J0740+6620, we provide a bound on $m_{\chi }$ within the framework of the present work as $m_{\chi }\approx$ (0.1 $-$ 30) GeV for a wide range of fixed DM Fermi momenta $k_F^{\chi }$=(0.01 $-$ 0.07) GeV. In the case of the hadronic models that yield larger radii corresponding to the low mass neutron stars in the no-DM scenario, interaction with comparatively heavier DM fermion is necessary in order to ensure that the DMANSs obtained with such models satisfy the radius constraints from both GW170817 and NICER data for PSR J0030+0451.

    ↳ astro-ph.HEhep-phnucl-thPRD(2024)·28 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.