Fri·Sep 22, 2023Friday·September 22, 2023

1. 01*

   The Quintuplet Annihilation Spectrum

   Matthew Baumgart🇺🇸 · Nicholas L. Rodd🇨🇭 · Tracy R. Slatyer🇺🇸 · Varun Vaidya🇺🇸

   We extend the Effective Field Theory of Heavy Dark Matter to arbitrary odd representations of SU(2) and incorporate the effects of bound states. This formalism is then deployed to compute the gamma-ray spectrum for a 5 of SU(2): quintuplet dark matter. Except at isolated values of the quintuplet mass, the bound state contribution to hard photons with energy near the dark-matter mass is at the level of a few percent compared to that from direct annihilation. Further, compared to smaller representations, such as the triplet wino, the quintuplet can exhibit a strong variation in the shape of the spectrum as a function of mass. Using our results, we forecast the fate of the thermal quintuplet, which has a mass of $\sim$13.6 TeV. We find that existing H.E.S.S. data should be able to significantly test the scenario, however, the final word on this canonical model of minimal dark matter will likely be left to the Cherenkov Telescope Array (CTA).

   hep-phastro-ph.COastro-ph.HEhep-thJHEP(2024)·26 citations
2. 02*

   NLL/NLO${}^{-}$ studies on Higgs-plus-jet production with POWHEG+JETHAD

   Francesco Giovanni Celiberto🇪🇸 · Luigi Delle Rose🇮🇹 · Michael Fucilla🇫🇷 · Gabriele Gatto🇮🇹 · Alessandro Papa🇮🇹

   We consider the semi-inclusive emission of a Higgs boson in association with a light-flavored jet separated by a large rapidity interval at the LHC. The accessed kinematic regimes fall into the so-called semi-hard sector, whose theoretical description lies at the intersection corner between the collinear factorization and the high-energy resummation. We present a prototype version of a matching procedure aimed at combining next-to-leading fixed-order (NLO) calculations from POWHEG with the resummation of next-to-leading energy logarithms (NLL) as obtained from JETHAD.

   hep-phhep-exPoS(2024)·26 citations
3. 03*

   Soft-gluon effective coupling: perturbative results and the large-nF limit to all orders

   Stefano Catani🇮🇹 · Daniel de Florian🇦🇷 · Simone Devoto🇮🇹 · Massimiliano Grazzini🇨🇭 · Javier Mazzitelli🇨🇭

   We consider extensions of the soft-gluon effective coupling that generalize the Catani--Marchesini--Webber (CMW) coupling in the context of soft-gluon resummation beyond the next-to-leading logarithmic accuracy. Starting from the probability density of correlated soft emission in d dimensions we introduce a class of soft couplings relevant for resummed QCD calculations of hard-scattering observables. We show that at the conformal point, where the d-dimensional QCD $\beta$ function vanishes, all these effective couplings are equal and they are also equal to the cusp anomalous dimension. We present explicit results in d dimensions for the soft-emission probability density and the soft couplings at the second-order in the QCD coupling ${\alpha }_s$. In d=4 dimensions we obtain the explicit relation between the soft couplings at $\mathcal{O}({\alpha }_s^3).$ Finally, we study the structure of the soft coupling in the large-$n_F$ limit and we present explicit expressions to all orders in perturbation theory. We also check that, at the conformal point, our large-$n_F$ results agree with the known result of the cusp anomalous dimension.

   hep-phhep-thJHEP(2023)·1 citation
4. 04*

   Bottomonium Dissociation in a Rotating Plasma

   Nelson R. F. Braga🇧🇷 · Yan F. Ferreira🇧🇷

   Heavy vector mesons provide important information about the quark gluon plasma (QGP) formed in heavy ion collisions. This happens because the fraction of quarkonium states that are produced depends on the properties of the medium. The intensity of the dissociation process in a plasma is affected by the temperature, the chemical potential and the presence of magnetic fields. These effects have been studied by many authors in the recent years. Another important factor that can affect the dissociation of heavy mesons, and still lacks of a better understanding, is the rotation of the plasma. Non central collisions form a plasma with angular momentum. Here we use a holographic model to investigate the thermal spectrum of bottomonium quasi-states in a rotating medium in order to describe how a non vanishing angular velocity affects the dissociation process.

   hep-phPRD(2023)·16 citations
5. 05*

   True muonium resonant production at $e^{+}{e}^{-}$ colliders with standard crossing angle

   Ruben Gargiulo🇮🇹 · Elisa Di Meco🇮🇹 · Daniele Paesani🇮🇹 · Stefano Palmisano🇮🇹 · Eleonora Diociaiuti🇮🇹 · Ivano Sarra🇮🇹

   True muonium (${\mu }^{+}{\mu }^{-}$) is the heaviest and smallest bound state not involving quantum chromodynamics, after true tauonium (${\tau }^{+}{\tau }^{-}$) and mu-tauonium (${\mu }^{\pm }{\tau }^{\mp }$). Unlike atoms containing $\tau$ particles, the muon lifetime is long enough to allow observation of true muonium (TM) decays and transitions. One of the proposed methods to observe the spin 1 fundamental state of TM, which has the smallest lifetime among TM spin 1 states, was to build an $e^{+}{e}^{-}$ collider with a large crossing angle ($\theta \sim 30^{\circ }$) in order to provide TM with a large boost and detect its decay vertex in $e^{+}{e}^{-}$. The following paper will instead show that TM excited states ($n\ge 2$) can be observed in relatively large quantities ($\mathcal{O}$(10)/month) at a feasible $e^{+}{e}^{-}$ collider with standard crossing angles, after setting their center-of-mass energy to the TM mass ($\sim 2m_{\mu }=211.4$ MeV).

   hep-phhep-exJ.Phys.G(2024)·11 citations
6. 06*

   On the role of soft gluons in collinear parton densities and parton shower event generators

   M. Mendizabal🇩🇪 · F. Guzman🇨🇺 · H. Jung🇩🇪 · S. Taheri Monfared🇩🇪

   The role of soft (non-perturbative) gluons in collinear parton densities and parton shower event generators is investigated with the Parton Branching method as a solution of the DGLAP evolution equations. It is found that soft gluons play a significant role. Within the Parton Branching frame, the Sudakov form factor can be split into a perturbative and non-perturbative part. The non-perturbative part can be calculated analytically under certain conditions. It is shown that the inclusion of soft (non-perturbative) gluons in the parton density evolution is essential for the proper cancellation of divergent terms. It is argued that the non-perturbative part of the Sudakov form factor has its correspondence in Transverse Momentum Dependent parton distributions. Within the Parton Branching approach, this non-perturbative Sudakov form factor is constrained by fits of inclusive, collinear parton densities. We show that the non-perturbative Sudakov form factor and soft gluon emissions are essential for inclusive distributions (collinear parton densities and Drell-Yan transverse momentum spectra). We also show by using Parton Branching TMD parton shower, that the effect of soft gluons plays essentially no role in final state hadron spectra and jets.

   hep-phEPJC(2024)·21 citations
7. 07*

   The $Y(4230)$ as a $D_1\bar{D}$ molecule

   Leon von Detten🇩🇪 · Christoph Hanhart🇩🇪 · Vadim Baru🇩🇪

   We show that the currently available data are consistent with $Y(4230)$ being a $D_1\bar{D}$ hadronic molecule. By a simultaneous fit to data from $e^{+}{e}^{-}\to D^0{D}^{\ast -}{\pi }^{+},J/\psi {\pi }^{+}{\pi }^{-},J/\psi K^{+}{K}^{-},h_c{\pi }^{+}{\pi }^{-},J/\psi \eta ,{\chi }_{c0}\omega ,{\chi }_{c1}(3872)\gamma$ and ${\mu }^{+}{\mu }^{-}$, we demonstrate that this single state can explain the experimental signals in the mass range from $4.2$ to $4.35\mathrm{GeV}.$

   hep-phEPJ Web Conf.(2024)·5 citations
8. 08*

   Gravitational Wave imprints of the Doublet Left-Right Symmetric Model

   Siddhartha Karmakar🇮🇳 · Dhruv Ringe🇮🇳

   We study the gravitational wave (GW) signature in the doublet left-right symmetric model (DLRSM) resulting from the strong first-order phase transition (SFOPT) associated with $SU(2{)}_R\times U(1{)}_{B-L}$-breaking. For different values of the symmetry-breaking scale $v_R=20,30$, and $50$ TeV, we construct the one-loop finite temperature effective potential to explore the parameter space for regions showing SFOPT. We identify the region where the associated stochastic GW background is strong enough to be detected at planned GW observatories. A strong GW background favors a relatively light neutral CP-even scalar $H_3$, arising from the $SU(2{)}_R$ doublet. The $SU(2{)}_L$ subgroup of DLRSM is broken by three vevs: ${\kappa }_1,{\kappa }_2$, and $v_L$. We observe a preference for $\mathcal{O}(1)$ values of the ratio $w=v_L/{\kappa }_1$, but no clear preference for the ratio $r={\kappa }_2/{\kappa }_1$. A large number of points with strong GW background can be ruled out from precise measurement of the trilinear Higgs coupling and searches for $H_3$ at future colliders.

   hep-phPRD(2024)·8 citations
9. 09*

   Dark Matter Annihilation via Breit-Wigner Enhancement with Heavier Mediator

   Yu Cheng🇨🇳 · Shao-Feng Ge🇨🇳 · Jie Sheng🇨🇳 · Tsutomu T. Yanagida🇨🇳

   We propose a new scenario that both the dark matter freeze-out in the early Universe and its possible annihilation for indirect detection around a supermassive black hole are enhanced by a Breit-Wigner resonance. With the mediator mass larger than the total initial dark matter mass, this annihilation is almost forbidden at late times. Thus, the stringent cosmic microwave background and indirect detection constraints do not apply. However, a supermassive black hole can accelerate the dark matter particles to reactivate this resonant annihilation whose subsequent decay to photons leaves a unique signal. The running Fermi-LAT and the future COSI satellites can test this scenario.

   hep-phastro-ph.HEPLB(2025)·11 citations
10. 10*

    Production rates of hidden-charm pentaquark molecules in ${\Lambda }_b$ decays

    Ya-Wen Pan🇨🇳 · Ming-Zhu Liu🇨🇳 · Li-Sheng Geng🇨🇳

    The partial decay widths and production mechanism of the three pentaquark states, $P_{\psi }^N(4312)$, $P_{\psi }^N(4440)$, and $P_{\psi }^N(4457)$, discovered by the LHCb Collaboration in 2019, are still under debate. In this work, we employ the contact-range effective field theory approach to construct the ${\bar{D}}^{(\ast )}{\Sigma }_c^{(\ast )}$, ${\bar{D}}^{\ast }{\Lambda }_c$, $\bar{D}{\Lambda }_c$, $J/\psi p$, and ${\eta }_{c}p$ coupled-channel interactions to dynamically generate the multiplet of hidde-charm pentaquark molecules by reproducing the masses and widths of $P_{\psi }^N(4312)$, $P_{\psi }^N(4440)$, and $P_{\psi }^N(4457)$. Assuming that the pentaquark molecules are produced in the ${\Lambda }_b$ decay via the triangle diagrams, where ${\Lambda }_b$ firstly decays into $D_s^{(\ast )}{\Lambda }_c$, then $D_s^{(\ast )}$ scatters into ${\bar{D}}^{(\ast )}K$, and finally the molecules are dynamically generated by the ${\bar{D}}^{(\ast )}{\Lambda }_c$ interactions, we calculate the branching fractions of the decays ${\Lambda }_b\to P_{\psi }^{N}K$ using the effective Lagrangian approach. With the partial decay widths of these pentaquark molecules, we further estimate the branching fraction of the decays ${\Lambda }_b\to (P_{\psi }^N\to J/\psi p)K$ and ${\Lambda }_b\to (P_{\psi }^N\to {\bar{D}}^{\ast }{\Lambda }_c)K$. Our results show that the pentaquark states $P_{\psi }^N(4312)$, $P_{\psi }^N(4440)$, and $P_{\psi }^N(4457)$ as hadronic molecules can be produced in the ${\Lambda }_b$ decay, and on the other hand their heavy quark spin symmetry partners are invisible in the $J/\psi p$ invariant mass distribution because of the small production rates. Our studies show that is possible to observe some of the pentaquark states in the ${\Lambda }_b\to {\bar{D}}^{\ast }{\Lambda }_{c}K$ decays.

    hep-phPRD(2023)·16 citations
11. 11*

    Pair Production in time-dependent Electric field at Finite times

    Deepak Sah🇮🇳 · Manoranjan P. Singh🇮🇳

    We investigate the finite-time behavior of pair production from the vacuum by a time-dependent Sauter pulsed electric field. By examining the temporal behavior of the single-particle distribution function, we observe oscillatory patterns in the longitudinal momentum spectrum of the particles at finite times. These oscillations arise due to quantum interference effects resulting from the various dynamical processes/channels leading to the creation of the (quasi-)particle of a given momentum. Furthermore, we derive an approximate and simplified analytical expression for the distribution function at finite times, allowing us to explain these oscillations' origin and behavior. The role of the vacuum polarization function and its counterterm are also discussed in this regard. The transverse momentum spectrum peaked at the nonzero value of the transverse momentum at finite times, which indicates the role of multiphoton transitions in the creation of quasiparticles.

    hep-phcond-mat.otherhep-thphysics.plasm-ph+17 citations
12. 12*

    Scotogenic model from an extended electroweak symmetry

    Phung Van Dong🇻🇳 · Duong Van Loi🇻🇳

    We argue that the higher weak isospin $SU(3{)}_L$ manifestly unifies dark matter and normal matter in its isomultiplets for which dark matter carries a conserved dark charge while normal matter does not. The resultant gauge symmetry is given by $SU(3{)}_C\otimes SU(3{)}_L\otimes U(1{)}_X\otimes U(1{)}_G$, where the first factor is the color group, while the rest defines a theory of scotoelectroweak in which $X$ and $G$ determine electric charge $Q=T_3-1/\sqrt{3}{T}_8+X$ and dark charge $D=-2/\sqrt{3}{T}_8+G$. This setup provides both appropriate scotogenic neutrino masses and dark matter stability as preserved by a residual dark parity $P_D=(-1{)}^D$. Interpretation of the dark charge is further discussed, given that $SU(3{)}_L$ is broken at very high energy scale.

    hep-phhep-thPRD(2024)·7 citations
13. 13*

    Dark Sector Effective Field Theory

    Jin-Han Liang🇨🇳 · Yi Liao🇨🇳 · Xiao-Dong Ma🇨🇳 · Hao-Lin Wang🇨🇳

    We introduce the effective field theory of two different light dark particles interacting with the standard model (SM) light states in a single vertex, termed dark sector effective field theory (DSEFT). We focus on the new light particles with spin up to 1 and being real in essence, namely, new real scalars $\varphi$ and $S$, Majorana fermions $\chi$ and $\psi$, and real vectors $X_{\mu }$ and $V_{\mu }$. In the framework of low energy effective field theory with QED and QCD symmetry, the DSEFT can be classified into six categories, including the scalar-scalar-SM ($\varphi S$-SM), fermion-fermion-SM ($\chi \psi$-SM), vector-vector-SM ($XV$-SM), scalar-fermion-SM ($\varphi \chi$-SM), scalar-vector-SM ($\varphi X$-SM), and fermion-vector-SM ($\chi X$-SM) cases. For each case, we construct the effective operator basis up to canonical dimension 7, which will cover most interesting phenomenology at low energy. As a phenomenological example, we investigate the longstanding neutron lifetime anomaly through the neutron dark decay modes $n\to \chi \varphi \text{ or }\chi X$ from the effective interactions in the fermion-scalar-SM or fermion-vector-SM case. When treating the light fermion as a dark matter candidate, we also explore the constraints from DM-neutron annihilation signal at Super-Kamiokande. We find the neutron dark decay in each scenario can accommodate the anomaly, at the same time, without contradicting with the Super-Kamiokande limit.

    hep-phJHEP(2023)·28 citations
14. 14*

    Impact of scalar NSI on the neutrino mass ordering sensitivity at DUNE, HK and KNO

    Arnab Sarker🇮🇳 · Abinash Medhi🇮🇳 · Dharitree Bezboruah🇮🇳 · Moon Moon Devi🇮🇳 · Debajyoti Dutta🇮🇳

    The study of neutrino non-standard interactions (NSI) is a well-motivated phenomenological scenario to explore new physics beyond the Standard Model. The possible scalar coupling of neutrinos ($\nu$) with matter is one of such new physics scenarios that appears as a sub-dominant effect that can impact the $\nu$-oscillations in matter. The presence of scalar NSI introduces an additional contribution directly to the $\nu$-mass matrix in the interaction Hamiltonian and subsequently to the $\nu$-oscillations. This indicates that scalar NSI may have a significant impact on measurements related to $\nu$-oscillations e.g. leptonic CP phase $({\delta }_{CP})$, ${\theta }_{23}$ octant and neutrino mass ordering (MO). The linear scaling of the effects of scalar NSI with matter density also motivates its exploration in long-baseline (LBL) experiments. In this paper, we study the impact of a scalar-mediated NSI on the MO sensitivity of DUNE, HK and HK+KNO, which are upcoming LBL experiments. We study the impact on MO sensitivities at these experiments assuming that scalar NSI parameters are present in nature and is known from other non-LBL experiments. We observe that the presence of diagonal scalar NSI elements can significantly affect the $\nu$-mass ordering sensitivities. We then also combine the data from DUNE with HK and HK+KNO to explore possible synergy among these experiments in a wider parameter space. We also observe a significant enhancement in the MO sensitivities for the combined analysis.

    hep-phJHEP(2024)·14 citations
15. 15*

    GRB221009A gamma-ray events from non-standard neutrino self-interactions

    Mansi Dhuria🇮🇳

    The flux of high-energy astrophysical neutrinos observed by the present generation of neutrino detectors has already indicated a few hints of new physics beyond the Standard Model. In this work, we show that high-energy gamma-ray observations can also be considered as a complementary probe for unveiling the source of high-energy astrophysical neutrino events and new physics. Recently, the LHAASO collaboration has reported O(5000) gamma-ray events in the energy range between 0.5 TeV -18 TeV from gamma-ray burst GRB221009A within 2000 seconds after the initial outburst. We showed that attenuated high-energy gamma rays can be produced from the interaction of astrophysical neutrinos with CMB neutrinos through non-standard self-interaction of neutrinos mediated by light scalar bosons. The non-standard interaction of neutrinos recently took a lot of attention in cosmology for its role in reducing Hubble tension. We have constrained the parameter space of non-standard self-interacting neutrinos from the flux of photons observed by LHAASO and showed consistency of the same with the resulting parameter space from Hubble tension requirements and other recent constraints from laboratory/cosmology.

    hep-phastro-ph.COastro-ph.HEPRD(2024)·7 citations
16. 16*

    Heavy ${\Xi }_{c/b}$ and ${\Xi }_{c/b}^{\prime }$ baryons in the quark model

    Emmanuel Ortiz-Pacheco🇸🇮 · Roelof Bijker🇲🇽

    We present a study of the low-lying ${\Xi }_{c/b}$ and ${\Xi }_{c/b}^{\prime }$ baryon states based on masses, strong and radiative decays. In a harmonic oscillator quark model analysis it is found that the majority of the detected states can be interpreted as $S$- and $P$-wave excitations.

    hep-phnucl-thJ.Phys.Conf.Ser.(2023)·3 citations
17. 17*

    Simultaneous Resonant and Broadband Detection of Ultralight Dark Matter and High-Frequency Gravitational Waves via Cavities and Circuits

    Yifan Chen🇩🇰 · Chunlong Li🇨🇳 · Yuxin Liu🇨🇳 · Jing Shu🇨🇳 · Yuting Yang🇨🇳 · Yanjie Zeng🇨🇳

    Electromagnetic resonant systems, such as cavities and LC circuits, are widely used to detect ultralight boson dark matter and high-frequency gravitational waves. However, the narrow bandwidth of single-mode resonators necessitates multiple scan steps to cover broad frequency ranges. By incorporating a network of auxiliary modes via beam-splitter-type and non-degenerate parametric couplings, we enable broadband detection with an effective bandwidth of each scan matching the order of the resonant frequency, while maintaining a strong signal response. In heterodyne upconversion detection, where a background cavity mode transitions into another due to a potential background source, multiple orders of the source frequency can be probed with high sensitivity without tuning the cavity frequency. Consequently, our method allows for significantly deeper exploration of the parameter space within the same integration time compared to single-mode detection.

    hep-phgr-qchep-exquant-phRept.Prog.Phys.(2025)·15 citations
18. 18*

    Domain walls in the Two-Higgs-Doublet Model and their charge and CP-violating interactions with Standard Model fermions

    Mohamed Younes Sassi🇩🇪 · Gudrid Moortgat-Pick🇩🇪

    Discrete symmetries play an important role in several extensions of the Standard Model (SM) of particle physics. For instance, in order to avoid flavor changing neutral currents, a discrete $Z_2$ symmetry is imposed on the Two-Higgs-Doublet Model (2HDM). This can lead to the formation of domain walls (DW) as the $Z_2$ symmetry gets spontaneously broken during electroweak symmetry breaking in the early universe and domain walls form between regions whose vacua are related by the discrete symmetry. Due to this simultaneous spontaneous breaking of both the discrete symmetry and the electroweak symmetry, the vacuum manifold consists of two disconnected 3-spheres. Such a non-trivial disconnected vacuum manifold leads to several choices for the vacua at two adjacent regions, in contrast to models where only the discrete symmetry gets spontaneously broken and the vacuum manifold consists of several disconnected points. Due to this, we end up with several classes of DW solutions having different properties localized inside the wall, such as charge and/or CP violating vacua. We discuss the properties of these different classes of DW solutions as well as the interaction of SM fermions with such topological defects leading to different exotic phenomena such as, for example, the top quark being transmitted or reflected off the wall as a bottom quark.

    hep-phJHEP(2024)·15 citations
19. 19*

    Candidate Molecules for Next-Generation Searches of Hadronic Charge-Parity Violation

    Aurélien Marc🇫🇷 · Mickaël Hubert🇫🇷 · Timo Fleig🇫🇷

    We systematically study a set of strongly polar heteronuclear diatomic molecules composed of laser-coolable atoms for their suitability as sensitive probes of new charge-parity violation in the hadron sector of matter. Using relativistic general-excitation-rank configuration interaction theory we single out the molecule francium-silver (FrAg) as the most promising system in this set and calculate its nuclear Schiff-moment interaction constant to $W_{SM}^{\mathrm{FrAg}}(\mathrm{Fr})=30168\pm 2504a.u.$ for the target nucleus Fr. Our work includes the development of system-tailored atomic Gaussian basis sets for the target atom in each respective molecule.

    ↳ physics.atom-phhep-phquant-phPRA(2023)·15 citations
20. 20*

    Higher Derivative Corrections to String Inflation

    Michele Cicoli🇮🇹 · Matteo Licheri🇮🇹 · Pellegrino Piantadosi🇮🇹 · Fernando Quevedo🇬🇧 · Pramod Shukla🇮🇳

    We quantitatively estimate the leading higher derivative corrections to $\mathcal{N}=1$ supergravity derived from IIB string compactifications and study how they may affect moduli stabilisation and LVS inflation models. Using the Kreuzer-Skarke database of 4D reflexive polytopes and their triangulated Calabi-Yau database, we present scanning results for a set of divisor topologies corresponding to threefolds with $1\le h^{1,1}\le 5$. In particular, we find several geometries suitable to realise blow-up inflation, fibre inflation and poly-instantons inflation, together with a classification of the divisors topologies for which the leading higher derivative corrections to the inflationary potential vanish. In all other cases, we instead estimate numerically how these corrections modify the inflationary dynamics, finding that that they do not destroy the predictions for the main cosmological observables.

    ↳ hep-thastro-ph.COhep-phJHEP(2024)·26 citations
21. 21*

    Causality and classical dispersion relations

    Raphael E. Hoult🇨🇦 · Pavel Kovtun🇨🇦

    We explore the consequences of relativistic causality and covariant stability for short-wavelength dispersion relations in classical systems. For excitations described by a finite number of partial differential equations, as is the case in relativistic hydrodynamics, we give causality and covariant stability constraints on the excitation's frequency at large momenta.

    ↳ hep-thhep-phnucl-thPRD(2024)·35 citations
22. 22*

    Stability and causality criteria in linear mode analysis: stability means causality

    Dong-Lin Wang🇨🇳 · Shi Pu🇨🇳

    Causality and stability are fundamental requirements for the differential equations describing predictable relativistic many-body systems. In this work, we investigate the stability and causality criteria in linear mode analysis. We discuss the updated stability criterion in 3+1 dimensional systems and introduce the improved sufficient criterion for causality. Our findings clearly demonstrate that stability implies causality in linear mode analysis. Furthermore, based on the theorems present in this work, we conclude that if updated stability criterion and improved causality criterion are fulfilled in one inertial frame of reference (IFR), they hold for all IFR.

    ↳ hep-thhep-phnucl-thPRD(2024)·30 citations
23. 23*

    Extragalactic Test of General Relativity from Strong Gravitational Lensing by using Artificial Neural Networks

    Jing-Yu Ran🇨🇳 · Jun-Jie Wei🇨🇳

    This study aims to test the validity of general relativity (GR) on kiloparsec scales by employing a newly compiled galaxy-scale strong gravitational lensing (SGL) sample. We utilize the distance sum rule within the Friedmann-Lema\^ıtre-Robertson-Walker metric to obtain cosmology-independent constraints on both the parameterized post-Newtonian parameter ${\gamma }_{\mathrm{PPN}}$ and the spatial curvature ${\Omega }_k$, which overcomes the circularity problem induced by the presumption of a cosmological model grounded in GR. To calibrate the distances in the SGL systems, we introduce a novel nonparametric approach, Artificial Neural Network (ANN), to reconstruct a smooth distance--redshift relation from the Pantheon+ sample of type Ia supernovae. Our results show that ${\gamma }_{\mathrm{PPN}}=1.16_{-0.12}^{+0.15}$ and ${\Omega }_k=0.89_{-1.00}^{+1.97}$, indicating a spatially flat universe with the conservation of GR (i.e., ${\Omega }_k=0$ and ${\gamma }_{\mathrm{PPN}}=1$) is basically supported within $1\sigma$ confidence level. Assuming a zero spatial curvature, we find ${\gamma }_{\mathrm{PPN}}=1.09_{-0.10}^{+0.11}$, representing an agreement with the prediction of 1 from GR to a 9.6\% precision. If we instead assume GR holds (i.e., ${\gamma }_{\mathrm{PPN}}=1$), the curvature parameter constraint can be further improved to be ${\Omega }_k=0.11_{-0.47}^{+0.78}$. These resulting constraints demonstrate the effectiveness of our method in testing GR on galactic scales by combining observations of strong lensing and the distance--redshift relation reconstructed by ANN.

    ↳ astro-ph.COgr-qchep-phPRD(2024)·4 citations
24. 24*

    Standard siren cosmology in the era of the 2.5-generation ground-based gravitational wave detectors: bright and dark sirens of LIGO Voyager and NEMO

    Shang-Jie Jin🇺🇸 · Rui-Qi Zhu🇺🇸 · Ji-Yu Song🇺🇸 · Tao Han🇺🇸 · Jing-Fei Zhang🇺🇸 · Xin Zhang🇺🇸

    The 2.5-generation (2.5G) ground-based gravitational wave (GW) detectors LIGO Voyager and NEMO are expected to be operational in the late 2020s and early 2030s. In this work, we explore the potential of GW standard sirens observed by the 2.5G GW detectors in measuring cosmological parameters, especially for the Hubble constant. Using GWs to measure cosmological parameters is inherently challenging, especially for 2.5G detectors, given their limited capability, which results in weaker constraints on cosmological parameters from the detected standard sirens. However, the measurement of the Hubble constant using standard siren observations from Voyager and NEMO is still promising. For example, using bright sirens from Voyager and NEMO can measure the Hubble constant with a precision of about $2\%$ and $6\%$ respectively, and using the Voyager-NEMO network can improve the precision to about $1.6\%$. Moreover, bright sirens can be used to break the degeneracy of cosmological parameters generated by CMB data, and to a certain extent, 2.5G detectors can also play a role in this aspect. Observations of dark sirens by 2.5G detectors can achieve relatively good results in measuring the Hubble constant, with a precision of within $2\%$, and if combining observations of bright and dark sirens, the precision of the Hubble constant measurement can reach about $1.4\%$. Finally, we also discussed the impact of the uncertainty in the binary neutron star merger rate on the estimation of cosmological parameters. We conclude that the magnificent prospect for solving the Hubble tension is worth expecting in the era of the 2.5G ground-based GW detectors.

    ↳ astro-ph.COgr-qchep-phJCAP(2024)·30 citations
25. 25*

    Primordial Black Hole Neutrinogenesis of Sterile Neutrino Dark Matter

    Muping Chen🇺🇸 · Graciela B. Gelmini🇺🇸 · Philip Lu🇰🇷 · Volodymyr Takhistov🇯🇵

    Sterile neutrinos are well-motivated and actively searched for new particles that would mix with the active neutrinos. We study their phenomenology when they are produced in the evaporation of early Universe black holes, a novel production mechanism that differs from all others and does not depend on the active-sterile mixing. The resulting hotter sterile neutrinos have a distinct spectrum and could be warm dark matter in the 0.3 MeV to 0.3 TeV mass range, distinct from the typical keV range. The possible coincidence of X-rays and gravitational waves is a unique novel signature of our scenario.

    ↳ astro-ph.COastro-ph.HEhep-phPLB(2024)·23 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.