Wed·Jun 21, 2023Wednesday·June 21, 2023

1. 01*

   When tadpoles matter: One-loop corrections for spectator Higgs in inflation

   Dražen Glavan🇨🇿 · Tomislav Prokopec🇳🇱

   We consider the classical attractor regime of the spectator Abelian Higgs model in power-law inflation, and compute the one-loop corrections to its evolution. For computations we utilize dimensional regularization and the propagators in the unitary gauge. The corrections to both the scalar condensate and the energy-momentum tensor exhibit secular ultraviolet contributions, that tend to slow down the rolling of the scalar down its potential, and drive it away from the classical attractor. These corrections need not be suppressed if the U(1) charge is much larger than the scalar self-coupling, which is seen already in flat space. In addition, at late times the secular corrections necessarily invalidate the perturbative loop expansion. We find the late time secular corrections to be captured by the renormalization group, which opens up the possibility to resum them past the breakdown of perturbativity.

   hep-phastro-ph.COgr-qchep-thJHEP(2023)·11 citations
2. 02*

   Coupled channels and production of near-threshold $B^{(\ast )}{\bar{B}}^{(\ast )}$ resonances in $e^{+}{e}^{-}$ annihilation

   S.G. Salnikov🇷🇺 · A.E. Bondar🇷🇺 · A.I. Milstein🇷🇺

   The effects of final-state interaction of hadrons, produced in $e^{+}{e}^{-}$ annihilation near the threshold, are discussed. If there is a loosely bound state or a virtual state in a system of produced hadrons, then the energy dependence of hadroproduction cross section is very strong. Our approach is based on the use of the effective potentials accounting for the interaction between hadrons in the final state. The cases of a few channels with nonzero transition amplitudes between them are considered. It is shown that these transitions drastically change the energy dependence of the cross sections. In particular, a narrow resonance below the threshold in one channel leads to a broad peak in another channel. We explained the non-trivial energy dependence of the production cross sections of $B\bar{B}$, $B^{\ast }\bar{B}$, $B{\bar{B}}^{\ast }$, $B^{\ast }{\bar{B}}^{\ast }$ near the thresholds in $e^{+}{e}^{-}$ annihilation and obtained good agreement between our predictions and the experimental data available.

   hep-phhep-exNPA(2024)·8 citations
3. 03*

   Horn-array haloscope for volume-efficient broadband axion searches

   Junu Jeong🇰🇷 · Sungwoo Youn🇰🇷 · Yannis K. Semertzidis🇰🇷

   The invisible axion is a hypothetical particle that arises from the Peccei-Quinn mechanism proposed to resolve the CP problem in quantum chromodynamics, and is considered one of the most favoured candidates for cold dark matter. Dish antennas can provide a useful scheme for sensitive search for dark matter axions. The conversion power through axion-photon couplings is proportional to the surface area of the metal plate, rather than the volume of the available magnetic field. To maximize the effect, we propose an advanced concept of haloscope that involves an array of horn antennae to increase the axion-induced photons and a reflector to focus them onto a photo sensor. Compared to other proposed schemes, this configuration can significantly improve the experimental sensitivity, especially in the terahertz region.

   hep-phhep-exPRD(2023)·6 citations
4. 04*

   Neutron Dark Decay

   Bartosz Fornal🇺🇸

   There exists a puzzling disagreement between the results for the neutron lifetime obtained in experiments using the beam technique versus those relying on the bottle method. A possible explanation of this discrepancy postulates the existence of a beyond-Standard-Model decay channel of the neutron involving new particles in the final state, some of which can be dark matter candidates. We review the current theoretical status of this proposal and discuss the particle physics models accommodating such a dark decay. We then elaborate on the efforts undertaken to test this hypothesis, summarizing the prospects for probing neutron dark decay channels in future experiments.

   hep-phUniverse(2023)·19 citations
5. 05*

   Charged Higgs-Boson Decays into Quarks

   Jamie Chang🇨🇭 · Fiona Kirk🇩🇪 · Margarete Mühlleitner🇩🇪 · Michael Spira🇨🇭

   We consider the full genuine next-to-leading order SUSY-QCD corrections to the charged Higgs decays into quarks supplemented by the NNLO corrections to the effective top and bottom Yukawa couplings. The NNLO corrections to the effective top Yukawa coupling are a new ingredient of our analysis. We arrive at an approximate NNLO prediction for MSSM charged Higgs decays after including the N${}^4$LO QCD corrections for large charged Higgs masses. The residual uncertainties are in the percent range or below, depending on the particular MSSM scenario.

   hep-phhep-exNPB(2023)·0 citations
6. 06*

   The Crewther relation, schemes, gauges and fixed points

   J.A. Gracey🇬🇧 · R.H. Mason🇬🇧

   We investigate the Crewther relation at high loop order in a variety of renormalization schemes and gauges. By examining the properties of the relation in schemes other than modified minimal subtraction (MSbar) at the fixed points of Quantum Chromodynamics we propose a generalization of the Crewther relation that extends the MSbar construction of Broadhurst and Kataev. A derivation based on the properties of the renormalization group equation is provided for the generalization which is tested in various scenarios.

   hep-phPRD(2023)·6 citations
7. 07*

   Neutrino Mixing Phenomenology: $A_4$ Discrete Flavor Symmetry with Type-I Seesaw Mechanism

   Animesh Barman🇮🇳 · Ng. K. Francis🇮🇳 · Hrishi Bora🇮🇳

   We study a neutrino mass model with $A_4$ discrete flavor symmetry using a type-I seesaw mechanism. The inclusion of extra flavons in our model leads to the deviations from exact tribimaximal mixing pattern resulting in a nonzero ${\theta }_{13}$ consistent with the recent experimental results and a sum rule for light neutrino masses is also obtained. In this framework, a connection is established among the neutrino mixing angles: reactor mixing angle(${\theta }_{13}$), solar mixing angle(${\theta }_{12}$) and atmospheric mixing angle (${\theta }_{23}$). This model also allows us a prediction of Dirac CP-phase and Jarlskog parameter $J$. The octant of the atmospheric mixing angle ${\theta }_{23}$ occupies the lower octant. Our model prefers normal hierarchy (NH) than inverted hierarchy (IH). We use the parameter space of our model of neutrino masses to study the neutrinoless double beta decay parameter $m_{ee}$. Keywords: Discrete flavor symmetry, Type-I seesaw mechanism, Tribimaximal mixing, Dirac CP-phase, Jarlskog parameter, Neutrinoless double beta decay

   hep-phMod.Phys.Lett.A(2024)·8 citations
8. 08*

   CPT-Odd effects on the electromagnetic properties of charged leptons in the Standard Model Extension

   J. S. Hurtado-Silva🇲🇽 · J. J. Toscano🇲🇽 · O. Vázquez-Hernández🇲🇽

   The impact of the CPT-Odd electroweak gauge sector of the Standard Model Extension on the electromagnetic properties of charged leptons is studied. This gauge sector is characterized by the $(k_1{)}_{\mu }$ and $(k_2{)}_{\mu }$ Lorentz violation (LV) coefficients, which have positive mass dimension because they are associated with a $U_Y(1)$-invariant and with an $S{U}_L(2)$-invariant dimension-three operators, respectively. We present a comprehensive study on the impact of this sector on the magnetic dipole moment (MDM) and the electric dipole moment (EDM) of charged leptons, up to second order in these LV coefficients, both at the tree and one-loop levels.The contributions of $O(k_i)$ to the MDM are found to be suppressed relative to the corresponding contributions to the EDM by approximately three orders of magnitude. Using a recent experimental limit on the electron EDM the $|(k_2{)}_0-|{\mathbf{k}}_2|\cos {\theta }_{\gamma }|<0.86m_e$ bound was obtained. As far as the contributions of $O(k_i^2)$ are concerned, we find that the tree-level contributions are suppressed with respect to the one-loop ones by at least a factor of $\left(m_l^2/m_Z^2\right)$. We find that the contribution to the electron MDM is by far the dominant one, as it can be up to four and seven orders of magnitude greater than those of the muon and tau, respectively. The Lorentz coefficient $(k_{AF}{)}_{\mu }$ of the Carroll-Field-Jackiw's QED is given by a linear combination of $(k_1{)}_{\mu }$ and $(k_2{)}_{\mu }$. Assuming that $|k_1^2|,|k_2^2|\gg |k_{AF}^2|$ and taking $(k_{AF}{)}_{\mu }=0$, which implies that $(k_1{)}_{\mu }$ and $(k_2{)}_{\mu }$ are collinear, we obtain an upper bound of $\left|\frac{k_2^2}{m_e^2}\right|<4.36\times 10^{-10}$. The fact that $k_2^2$ is an observer Lorentz invariant allows us to introduce a new-physics scale through $\sqrt{k_2^2}={\Lambda }_{CPT}$, for which we obtain the upper limit ${\Lambda }_{CPT}<2.08\times 10^{-5}{m}_e$.

   hep-phJ.Phys.G(2025)·3 citations
9. 09*

   Perturbative unitarity constraints on generic vector interactions

   Daniele Barducci🇮🇹 · Marco Nardecchia🇮🇹 · Claudio Toni🇮🇹

   We study perturbative unitarity constraints on generic interactions between fermion and vector fields, which are allowed to have generic quantum numbers under a ${\prod }_{i}SU(N_i)\otimes U(1)$ group. We derive compact expressions for the bounds on the couplings for the cases where the fields transform under the trivial, fundamental or adjoint representation of the various, considering both the case of a complex vector arbitrary interactions with fermionic current and also the case of vectors arising as gauge fields. We apply our results to some specific NP models showing the constraints that can be derived using the tool of perturbative unitarity.

   hep-phJHEP(2023)·12 citations
10. 10*

    Optimized $\mathcal{O}({\alpha }_s^2)$ correction to exclusive double $J/\psi$ production at $B$ factories

    Wen-Long Sang🇨🇳 · Feng Feng🇨🇳 · Yu Jia🇨🇳 · Zhewen Mo🇨🇳 · Jichen Pan🇨🇳 · Jia-Yue Zhang🇨🇳

    The failure of observing the $e^{+}{e}^{-}\to J/\psi +J/\psi$ events at $B$ factories to date is often attributed to the significant negative order-${\alpha }_s$ correction. In this work we compute the $\mathcal{O}({\alpha }_s^2)$ correction to this process for the first time. The magnitude of the next-to-next-to-leading order (NNLO) perturbative correction is substantially negative so that the standard NRQCD prediction would suffer from an unphysical, negative cross section. This dilemma may be traced in the fact that the bulk contribution of the fixed-order radiative corrections stems from the perturbative corrections to the $J/\psi$ decay constant. We thus implement an improved NRQCD factorization framework, by decomposing the amplitude into the photon-fragmentation piece and the non-fragmentation piece. With the measured $J/\psi$ decay constant as input, which amounts to resumming a specific class of radiative and relativistic corrections to all orders, the fragmentation-induced production rate can be predicted accurately and serves a benchmark prediction. The non-fragmentation type of the amplitude is then computed through NNLO in ${\alpha }_s$ and at lowest order in velocity. Both the $\mathcal{O}({\alpha }_s)$ and $\mathcal{O}({\alpha }_s^2)$ corrections in the interference term become positive and exhibit a decent convergence behavior. Our finest prediction is $\sigma (e^{+}{e}^{-}\to J/\psi +J/\psi )=2.13_{-0.06}^{+0.30}$ fb at $\sqrt{s}=10.58$ GeV. With the projected integrated luminosity of 50 ${\mathrm{ab}}^{-1}$, the prospect to observe this exclusive process at \texttt{Belle} 2 experiment appears to be bright.

    hep-phhep-exPRL(2023)·16 citations
11. 11*

    A Hunt for Magnetic Signatures of Hidden-Photon and Axion Dark Matter in the Wilderness

    Ibrahim A. Sulai · Saarik Kalia · Ariel Arza · Itay M. Bloch · Eduardo Castro Muñoz · Christopher Fabian · Michael A. Fedderke · Madison Forseth · Brian Garthwaite · Peter W. Graham · Will Griffith · Erik Helgren and 8 other authors

    Earth can act as a transducer to convert ultralight bosonic dark matter (axions and hidden photons) into an oscillating magnetic field with a characteristic pattern across its surface. Here we describe the first results of a dedicated experiment, the Search for Non-Interacting Particles Experimental Hunt (SNIPE Hunt), that aims to detect such dark-matter-induced magnetic-field patterns by performing correlated measurements with a network of magnetometers in relatively quiet magnetic environments (in the wilderness far from human-generated magnetic noise). Our experiment constrains parameter space describing hidden-photon and axion dark matter with Compton frequencies in the 0.5-5.0 Hz range. Limits on the kinetic-mixing parameter for hidden-photon dark matter represent the best experimental bounds to date in this frequency range.

    hep-phastro-ph.COPRD(2023)·36 citations
12. 12*

    Implications of the DLMA solution of ${\theta }_{12}$ for IceCube data using different astrophysical sources

    Monojit Ghosh🇭🇷 · Srubabati Goswami🇮🇳 · Supriya Pan🇮🇳 · Bartol Pavlović🇭🇷

    In this paper, we study the implications of the Dark Large Mixing Angle (DLMA) solutions of ${\theta }_{12}$ in the context of the IceCube data. We study the consequences in the measurement of the neutrino oscillation parameters namely ${\theta }_{23}$ and ${\delta }_{\mathrm{CP}}$ in light of both Large Mixing Angle (LMA) and DLMA solutions of ${\theta }_{12}$. We find that it will be impossible for IceCube to determine the ${\delta }_{\mathrm{CP}}$ and the true nature of ${\theta }_{12}$ i.e., LMA or DLMA at the same time. This is because of the existence of an intrinsic degeneracy at the Hamiltonian level between these parameters. Apart from that, we also identify a new degeneracy between ${\theta }_{23}$ and two solutions of ${\theta }_{12}$ for a fixed value of ${\delta }_{\mathrm{CP}}$. We perform a chi-square fit using three different astrophysical sources, i.e., $\mu$ source, $\pi$ source, and $n$ source to find that both $\mu$ source and $\pi$ source are allowed within $1\sigma$ whereas the $n$ source is excluded at $2\sigma$. It is difficult to make any conclusion regarding the measurement of ${\theta }_{23}$, ${\delta }_{\mathrm{CP}}$ for $\mu$ source. However, The $\pi$ ($n$) source prefers higher (lower) octant of ${\theta }_{23}$ for both LMA and DLMA solution of ${\theta }_{12}$. The best-fit value of ${\delta }_{\mathrm{CP}}$ is around $180^{\circ }$ ($0^{\circ }/360^{\circ }$) for LMA (DLMA) solution of ${\theta }_{12}$ whereas for DLMA (LMA) solution of ${\theta }_{12}$, the best-fit value is around $0^{\circ }/360^{\circ }$ ($180^{\circ }$) for $\pi$ ($n$) source. If we assume the current best-fit values of ${\theta }_{23}$ and ${\delta }_{\mathrm{CP}}$ to be true, then the $\mu$ and $\pi$ source prefer the LMA solution of ${\theta }_{12}$ whereas the $n$ source prefers the DLMA solution of ${\theta }_{12}$.

    hep-phUniverse(2023)·1 citation
13. 13*

    Evolution of thermodynamic quantities on cosmological horizon in $\Lambda (t)$ model

    Nobuyoshi Komatsu🇯🇵

    The horizon of a flat Friedmann--Robertson--Walker (FRW) universe is considered to be dynamic when the Hubble parameter $H$ and the Hubble radius $r_H$ vary with time, unlike for de Sitter universes. To clarify the thermodynamics on a dynamic horizon, the evolution of a dynamical Kodama--Hayward temperature and Bekenstein--Hawking entropy on the horizon of a flat FRW universe is examined in a $\Lambda (t)$ model similar to time-varying $\Lambda (t)$ cosmologies. The $\Lambda (t)$ model includes both a power-law term proportional to $H^{\alpha }$ (where $\alpha$ is a free variable) and the equation of state parameter $w$, extending a previous analysis [Phys. Rev. D 100, 123545 (2019) (arXiv:1911.08306)]. Using the present model, a matter-dominated universe ($w=0$) and a radiation-dominated universe ($w=1/3$) are examined, setting $\alpha <2$. Both universes tend to approach de Sitter universes and satisfy the maximization of entropy in the last stage. The evolution of several parameters (such as the Bekenstein--Hawking entropy) is similar for both $w=0$ and $w=1/3$, though the dynamical temperature $T_H$ is different. In particular, $T_H$ is found to be constant when $w=1/3$ with $\alpha =1$, although $H$ and $r_H$ vary with time. To discuss this case, the specific conditions required for constant $T_H$ are examined. Applying the specific condition to the present model gives a cosmological model that can describe a universe at constant $T_H$, as if the dynamic horizon is in contact with a heat bath. The relaxation processes for the universe are also discussed.

    ↳ gr-qcastro-ph.COhep-phPRD(2023)·18 citations
14. 14*

    Experimental methods and prospects on the measurement of electroweak $b$ and $c$-quark observables at the ILC operating at 250 GeV

    A. Irles (1)🇪🇸 · R. Pöschl (2)🇫🇷 · F. Richard (2) (on behalf the ILD concept group, (1) IFIC, Universitat de València and CSIC, C./ Catedrático José Beltrán 2, Spain, (2) Université Paris-Saclay, CNRS/IN2P3, IJCLab, France)🇫🇷

    This paper describes a comprehensive experimental study on viability and prospects for the measurement of electroweak observables in $e^{+}{e}^{-}\to b\bar{b}$ and $e^{+}{e}^{-}\to c\bar{c}$ processes at the International Linear Collider (ILC) operating at 250 GeV of centre of mass energy. The ILC will produce electron and positron beams with different degrees of longitudinal polarisation (up to 80$\%$ for electrons and $30\%$ for positrons). The studies are based on a detailed simulation of the International Large Detector (ILD) concept. This will allow to inspect in detail the four independent chirality combinations of the electroweak couplings to electrons and other fermions and also perform background free analysis. The ILD design is based on the particle flow approach and the excellent vertexing and tracking capabilities, including charged hadron identification thanks to the $dE/dx$. We evaluate the main sources of experimental systematic uncertainties and identify the key design aspects of the accelerator and detector that are crucial to achieve the required per mil level accuracy that matches the expected statistical accuracy.

    ↳ hep-exhep-ph13 citations
15. 15*

    The Relation Between KMOC and Worldline Formalisms for Classical Gravity

    Poul H. Damgaard🇩🇰 · Elias Roos Hansen🇩🇰 · Ludovic Planté🇩🇰 · Pierre Vanhove🇫🇷

    We demonstrate the equivalence between KMOC and worldline formalisms for classical general relativity, highlighting how the Keldysh-Schwinger in-in formalism is contained in both of them even though the KMOC representation conventionally leads to the evaluation of scattering amplitudes with Feynman propagators. The relationship between the two approaches is illustrated in detail for the momentum kick at second Post-Minkowskian order.

    ↳ hep-thgr-qchep-phJHEP(2023)·60 citations
16. 16*

    Remarks on the quasi-position representation in models of generalized uncertainty principle

    André H. Gomes🇧🇷

    This note aims to elucidate certain aspects of the quasi-position representation frequently used in the investigation of one-dimensional models based on the generalized uncertainty principle (GUP). We specifically focus on two key points: (i) Contrary to recent claims, the quasi-position operator can possess physical significance even though it is non-Hermitian, and (ii) in the quasi-position representation, operators associated with the position, such as the potential energy, also behave as a derivative operator on the quasi-position coordinate, unless the method of computing expectation values is modified. The development of both points revolves around the observation that the position and quasi-position operators share the same set of eigenvalues and are connected through a non-unitary canonical transformation. This outcome may have implications for widely referenced constraints on GUP parameters.

    ↳ quant-phhep-phClass.Quant.Grav.(2023)·1 citation
17. 17*

    Symplectic lattice gauge theories on Grid: approaching the conformal window

    Ed Bennett🇬🇧 · Peter A. Boyle🇺🇸 · Luigi Del Debbio🇬🇧 · Niccolò Forzano🇬🇧 · Deog Ki Hong🇰🇷 · Jong-Wan Lee🇰🇷 · Julian Lenz🇬🇧 · C.-J. David Lin🇹🇼 · Biagio Lucini🇬🇧 · Alessandro Lupo🇬🇧 · Maurizio Piai🇬🇧 · Davide Vadacchino🇬🇧

    Symplectic gauge theories coupled to matter fields lead to symmetry enhancement phenomena that have potential applications in such diverse contexts as composite Higgs, top partial compositeness, strongly interacting dark matter, and dilaton-Higgs models. These theories are also interesting on theoretical grounds, for example in reference to the approach to the large-N limit. A particularly compelling research aim is the determination of the extent of the conformal window in gauge theories with symplectic groups coupled to matter, for different groups and for field content consisting of fermions transforming in different representations. Such determination would have far-reaching implications, but requires overcoming huge technical challenges. Numerical studies based on lattice field theory can provide the quantitative information necessary to this endeavour. We developed new software to implement symplectic groups in the Monte Carlo algorithms within the Grid framework. In this paper, we focus most of our attention on the Sp(4) lattice gauge theory coupled to four (Wilson-Dirac) fermions transforming in the 2-index antisymmetric representation, as a case study. We discuss an extensive catalogue of technical tests of the algorithms and present preliminary measurements to set the stage for future large-scale numerical investigations. We also include the scan of parameter space of all asymptotically free Sp(4) lattice gauge theories coupled to varying number of fermions transforming in the antisymmetric representation.

    ↳ hep-lathep-phhep-thPRD(2023)·30 citations
18. 18*

    Investigating the Violation of Charge Parity Symmetry Through Top Quark Chromo-Electric Dipole Moments by Using Machine Learning Techniques

    B. Işıldak🇹🇷 · A. Hayreter🇹🇷 · M. Hüdaverdi🇹🇷 · F. Ilgın🇹🇷 · S. Salva🇹🇷 · E. Şimşek🇹🇷 · S. Güyer🇹🇷

    There are a number of studies in the literature on search for Charge-Parity (CP) violating signals in top quark productions at the LHC. In most of these studies, ChromoMagnetic Dipole Moments (CMDM) and ChromoElectric Dipole Moments (CEDM) of top quarks is bounded either by deviations from the Standard Model (SM) cross sections or by T-odd asymmetries in di-muon channels. However, the required precision on these cross section values are far beyond from that of ATLAS or CMS experiments can reach. In this letter, the investigation of CEDM based asymmetries in the semileptonic top pair decays are presented as T-odd asymmetries in CMS experiment. Expected asymmetry values are determined at the detector level using MadGraph5, Pythia8 and Delphes softwares along with the discrimination of the signal and the background with Deep Neural Networks (DNN).

    ↳ hep-exhep-phhep-thActa Phys.Polon.B(2023)·2 citations
19. 19*

    $\text{MultiHypExp}$: A Mathematica Package For Expanding Multivariate Hypergeometric Functions In Terms Of Multiple Polylogarithms

    Souvik Bera🇮🇳

    We present the Mathematica package $\text{MultiHypExp}$ that allows for the expansion of multivariate hypergeometric functions (MHFs), especially those likely to appear as solutions of multi-loop, multi-scale Feynman integrals, in the dimensional regularization parameter. The series expansion of MHFs can be carried out around integer values of parameters to express the series coefficients in terms of multiple polylogarithms. The package uses a modified version of the algorithm prescribed in arXiv:2208.01000v2. In the present work, we relate a given MHF to a Taylor series expandable MHF by a differential operator. The Taylor expansion of the latter MHF is found by first finding the associated partial differential equations (PDEs) from its series representation. We then bring the PDEs to the Pfaffian system and further to the canonical form, and solve them order by order in the expansion parameter using appropriate boundary conditions. The Taylor expansion so obtained and the differential operators are used to find the series expansion of the given MHF. We provide examples to demonstrate the algorithm and to describe the usage of the package, which can be found in https://github.com/souvik5151/MultiHypExp.

    ↳ hep-thhep-phmath-phmath.MPComput.Phys.Commun.(2024)·15 citations
20. 20*

    Signatures of a Parity-Violating Universe

    William R. Coulton🇺🇸 · Oliver H. E. Philcox🇺🇸 · Francisco Villaescusa-Navarro🇺🇸

    What would a parity-violating universe look like? We present a numerical and theoretical study of mirror asymmetries in the late universe, using a new suite of $N$-body simulations: QUIJOTE-Odd. These feature parity-violating initial conditions, injected via a simple ansatz for the imaginary primordial trispectrum and evolved into the non-linear regime. We find that the realization-averaged power spectrum, bispectrum, halo mass function, and matter PDF are not affected by our modifications to the initial conditions, deep into the non-linear regime, which we argue arises from rotational and translational invariance. In contrast, the parity-odd trispectrum of matter (measured using a new estimator), shows distinct signatures proportional to the parity-violating parameter, $p_{\mathrm{NL}}$, which sets the amplitude of the primordial trispectrum. We additionally find intriguing signatures in the angular momentum of halos, with the primordial trispectrum inducing a non-zero correlation between angular momentum and smoothed velocity field, proportional to $p_{\mathrm{NL}}$. Our simulation suite has been made public to facilitate future analyses.

    ↳ astro-ph.COastro-ph.GAgr-qchep-ph+1PRD(2024)·42 citations
21. 21*

    Gravitational Radiation from hyperbolic encounters in the presence of dark matter

    Abhishek Chowdhuri🇮🇳 · Rishabh Kumar Singh🇮🇳 · Kaushik Kangsabanik🇮🇳 · Arpan Bhattacharyya🇮🇳

    In this study, we look into binaries undergoing gravitational radiation during a hyperbolic passage. Such hyperbolic events can be a credible source of gravitational waves in future detectors. We systematically calculate fluxes of gravitational radiation from such events in the presence of dark matter with different profiles, also considering the effects of dynamical friction. We provide an estimate for the braking index and show how it evolves due to the presence of the dark matter medium. We also investigate the binary dynamics through the changes in the orbital parameters by treating the potential due to dark matter spike and the dynamical friction effects as a perturbation term. An insight into the effects of such a medium on the binaries from the corresponding osculating elements opens up avenues to study binary dynamics for such events.

    ↳ gr-qcastro-ph.HEhep-phhep-thPRD(2024)·34 citations
22. 22*

    Observation of microscopic confinement dynamics by a tunable topological $\theta$-angle

    Wei-Yong Zhang🇨🇳 · Ying Liu🇨🇳 · Yanting Cheng🇨🇳 · Ming-Gen He🇨🇳 · Han-Yi Wang🇨🇳 · Tian-Yi Wang🇨🇳 · Zi-Hang Zhu🇨🇳 · Guo-Xian Su🇨🇳 · Zhao-Yu Zhou🇨🇳 · Yong-Guang Zheng🇨🇳 · Hui Sun🇨🇳 · Bing Yang🇨🇳 and 5 other authors

    The topological $\theta$-angle is central to the understanding of a plethora of phenomena in condensed matter and high-energy physics such as the strong CP problem, dynamical quantum topological phase transitions, and the confinement--deconfinement transition. Difficulties arise when probing the effects of the topological $\theta$-angle using classical methods, in particular through the appearance of a sign problem in numerical simulations. Quantum simulators offer a powerful alternate venue for realizing the $\theta$-angle, which has hitherto remained an outstanding challenge due to the difficulty of introducing a dynamical electric field in the experiment. Here, we report on the experimental realization of a tunable topological $\theta$-angle in a Bose--Hubbard gauge-theory quantum simulator, implemented through a tilted superlattice potential that induces an effective background electric field. We demonstrate the rich physics due to this angle by the direct observation of the confinement--deconfinement transition of $(1+1)$-dimensional quantum electrodynamics. Using an atomic-precision quantum gas microscope, we distinguish between the confined and deconfined phases by monitoring the real-time evolution of particle--antiparticle pairs, which exhibit constrained (ballistic) propagation for a finite (vanishing) deviation of the $\theta$-angle from $\pi$. Our work provides a major step forward in the realization of topological terms on modern quantum simulators, and the exploration of rich physics they have been theorized to entail.

    ↳ cond-mat.quant-gashep-lathep-phphysics.atom-ph+1Nat.Phys.(2025)·120 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.