Wed·Nov 22, 2023Wednesday·November 22, 2023

1. 01*

   Heavy-Light and Doubly-Strange Diquark Spectrum from QCD Laplace Sum-Rules and Diagrammatic Renormalization Methods

   Thamirys de Oliveira🇨🇦

   In addition to the conventional $q\bar{q}$ and $qqq$ bound states of quarks $q$, exotic hadrons, such as the four-quark $q\bar{q}q\bar{q}$ and the five-quark $qqqq\bar{q}$ bound states, can be constructed by assuming colour confinement in strong interactions. In particular, one of the possible internal structure for a four-quark state is the tetraquark $[qq][\bar{q}\bar{q}]$, where diquarks $[qq]$ and antidiquarks $[\bar{q}\bar{q}]$ are bound due to the colour force. In this thesis, heavy-light $[Qq]$, where $Q\in \{c,b\}$ (charm, bottom) and $q\in \{u,d,s\}$ (up, down, strange), and doubly-strange $[ss]$ diquarks are examined using QCD Laplace sum-rules. The diquark two-point correlation function is renormalized using diagrammatic renormalization methods for QCD correlation functions that are developed and compared to the conventional renormalization method. It is shown that the mixing of composite operators induced by the conventional renormalization approach is avoided by the diagrammatic renormalization method. The strange quark condensate parameter $\kappa =⟨\bar{s}s⟩/⟨\bar{n}n⟩$, where $n\in \{u,d\}$, is shown to have an important role on the $[Qs]$ and $[Qn]$ diquark mass splitting.

   hep-ph0 citations
2. 02*

   The Chiral Lagrangian of CP-Violating Axion-Like Particles

   Luca Di Luzio🇮🇹 · Gabriele Levati🇮🇹 · Paride Paradisi🇮🇹

   We discuss the construction of the most general CP-violating chiral Lagrangian for an axion-like particle (ALP). Starting with an effective Lagrangian containing light quarks and gluons, we provide its matching onto a chiral effective Lagrangian at $\mathcal{O}(p^2)$ described in terms of mesons and baryons, identifying the correspondence between the Jarlskog invariants of the two theories. After deriving the ALP interactions with mesons and baryons, we analyse a few relevant phenomenological implications such as the permanent electric dipole moments of nucleons and the CP-violating ALP and kaon decays.This work provides the necessary tools for further phenomenological analyses connecting low-energy observables with the couplings of the underlying ultraviolet complete theory.

   hep-phhep-exJHEP(2024)·46 citations
3. 03*

   Sensitivity of polarizations and spin correlations of Z boson to anomalous neutral triple gauge couplings at lepton collider with polarized beams

   Amir Subba🇮🇳 · Ritesh K. Singh🇮🇳

   We investigate the effects of anomalous neutral triple gauge couplings in $ZZ$ and $Z\gamma$ production processes, followed by the leptonic decay of the $Z$ boson, at a lepton collider with center-of-mass energy $\sqrt{s}=250$~GeV and polarized beams. We use an effective Lagrangian formalism to parameterize the anomalous couplings in terms of dimension-8 operators $c_{\tilde{B}W}$, $c_{BW}$, $c_{WW}$, and $c_{BB}$, and study the sensitivity of observables such as cross~section, polarization, and spin correlation as functions of these couplings. We perform a Bayesian statistical analysis using Markov Chain Monte Carlo methods to determine simultaneous limits on the anomalous couplings, taking into account various luminosities $\mathcal{L}\in \{0.1{\text{ab}}^{-1},0.3{\text{ab}}^{-1},1{\text{ab}}^{-1},3{\text{ab}}^{-1},10{\text{ab}}^{-1}\}$ and systematic uncertainties. We find that polarization and spin correlation observables significantly enhance the sensitivity to anomalous couplings, providing stringent constraints on these couplings.

   hep-phPRD(2024)·3 citations
4. 04*

   Novel Cross Section Ratios as Possible Signals of Saturation in UPCs

   Yuri V. Kovchegov🇺🇸 · Huachen Sun🇺🇸 · Zhoudunming Tu🇺🇸

   We propose new cross section ratios in ultra-peripheral A$+$A and $p+$A collisions (UPCs) as a potential experimental signal of saturation physics. We consider the ratio $R_1$ of elastic vector meson photoproduction cross section to the inclusive hadron or jet photoproduction cross section. The ratio can be measured in the $\gamma +$A and $\gamma +p$ collisions taking place in the UPCs. We label the ratios $R_1(\mathrm{A})$ and $R_1(p)$, respectively. Constructing the double ratio $R_{\mathrm{UPC}}(\mathrm{A})=R_1(\mathrm{A})/R_1(p)$, and performing a small-$x$ calculation both in the quasi-classical approximation and by including small-$x$ evolution, we observe that $R_{\mathrm{UPC}}(\mathrm{A})$ exhibits a markedly different dependence on the nuclear atomic number inside and outside the saturation region. This result indicates that $R_{\mathrm{UPC}}(\mathrm{A})$ and $R_1(\mathrm{A})$ measurements in UPCs may help in the experimental searches for the evidence of saturation physics.

   hep-phhep-exnucl-exnucl-thPRD(2024)·11 citations
5. 05*

   Reclassifying Feynman integrals as special functions

   Zhi-Feng Liu🇨🇳 · Yan-Qing Ma🇨🇳 · Chen-Yu Wang🇩🇪

   Although Feynman integrals in general cannot be expressed as well-studied special functions, they can be calculated systematically and efficiently using the \texttt{AMFlow} method in combination with differential equations in the kinematic space. Therefore, it is constructive to define Feynman integrals as a new class of special functions (or transcedental numbers if there is no kinematic variable). Several crucial avenues for further exploration in this direction are outlined.

   hep-phhep-thSci.Bull.(2024)·2 citations
6. 06*

   Searching for doubly charmed baryon from ${\overline{B}}_c$ meson decays

   Ye Xing🇨🇳 · Ji Xu🇨🇳

   In this paper, we study the production of doubly charmed baryon from anti-bottom charmed meson. Using the effective Lagrangian approach, we discuss triangle diagrams in hadronic level to get access to the branching ratios of ${\overline{B}}_c\to {\mathcal{B}}_{ccq}+{\mathcal{B}}_{\bar{c}\bar{q}\bar{q}}$. It seems that the specific process ${\overline{B}}_c\to {\Xi }_{cc}^{++}{\overline{\Xi }}_{\bar{c}}^{{}^{\prime }-}$ occupies the largest possibility in the order of $6.68\times 10^{-6}$. In addition, although the production of undiscovered ${\Omega }_{cc}^{+}$ is Cabibbo suppressed in ${\overline{B}}_c\to {\Omega }_{cc}^{+}{\overline{\Xi }}_{\bar{c}}^0$, it's branching ratio can still reach $10^{-7}$ level. These results are excepted to be fairly valuable supports for future experiments.

   hep-phCPC(2025)·3 citations
7. 07*

   SU(3) analysis of non-factorizable contributions to decays of Bottom mesons emitting two pseudoscalar mesons

   Maninder Kaur🇮🇳 · R. C. Verma🇮🇳

   Two-body weak decays of bottom mesons into two pseudoscalar mesons are examined employing SU(3) flavor symmetry for the nonfactorizable matrix elements. Using certain measured Cabibo-favored modes, we fix the reduced matrix elements and predict the branching ratios of the Cabibbo-angle favored and suppressed decays of B and Bs mesons.

   hep-ph0 citations
8. 08*

   Quantum Gravity Effects on Fermionic Dark Matter and Gravitational Waves

   Stephen F. King🇬🇧 · Rishav Roshan🇬🇧 · Xin Wang🇬🇧 · Graham White🇬🇧 · Masahito Yamazaki🇯🇵

   We explore the phenomenological consequences of breaking discrete global symmetries in quantum gravity (QG). We extend a previous scenario where discrete global symmetries are responsible for scalar dark matter (DM) and domain walls (DWs), to the case of fermionic DM, considered as a feebly interacting massive particle, which achieves the correct DM relic density via the freeze-in mechanism. Due to the mixing between DM and the standard model neutrinos, various indirect DM detection methods can be employed to constrain the QG scale, the scale of freeze-in, and the reheating temperature simultaneously. Since such QG symmetry breaking leads to DW annihilation, this may generate the characteristic gravitational wave background, and hence explain the recent observations of the gravitational wave spectrum by pulsar timing arrays. This work therefore highlights a tantalizing possibility of probing the effective scale of QG from observations.

   hep-phastro-ph.HEhep-thJCAP(2024)·17 citations
9. 09*

   Probing light quark Yukawa couplings through angularity distributions in Higgs boson decay

   Bin Yan🇨🇳 · Christopher Lee🇺🇸

   We propose to utilize angularity distributions in Higgs boson decay to probe light quark Yukawa couplings at $e^{+}{e}^{-}$ colliders. Angularities ${\tau }_a$ are a class of 2-jet event shapes with variable and tunable sensitivity to the distribution of radiation in hadronic jets in the final state. Using soft-collinear effective theory (SCET), we present a prediction of angularity distributions from Higgs decaying to quark and gluon states at $e^{+}{e}^{-}$ colliders to $\mathrm{NNLL}+\mathcal{O}({\alpha }_s)$ accuracy. Due to the different color structures in quark and gluon jets, the angularity distributions from $H\to q\bar{q}$ and $H\to gg$ show different behaviors and can be used to constrain the light quark Yukawa couplings. We show that the upper limit of light quark Yukawa couplings could be probed to the level of $\sim 15\%$ of the bottom quark Yukawa coupling in the Standard Model in a conservative analysis window far away from nonperturbative effects and other uncertainties; the limit can be pushed to $\lesssim 7-9\%$ with better control of the nonperturbative effects especially on gluon angularity distributions and/or with multiple angularities.

   hep-phhep-exJHEP(2024)·11 citations
10. 10*

    Exotic $Qq\bar{q}\bar{q}$ states in the chiral quark model

    Yuheng Wu🇨🇳 · Ye Yan🇨🇳 · Yue Tan🇨🇳 · Hongxia Huang🇨🇳 · Jialun Ping🇨🇳 · Xinmei Zhu🇨🇳

    In the framework of the chiral quark model, we investigate the $Qq\bar{q}\bar{q}$ ($Q=c,b$ and $q=u,d$) tetraquark system with two structures: $Q\bar{q}$-$q\bar{q}$ and $Qq$-$\bar{q}\bar{q}$. The bound-state calculation shows that for the single channel, there is no evidence for any bound state below the minimum threshold in both $cq\bar{q}\bar{q}$ and $bq\bar{q}\bar{q}$ systems. However, after coupling all channels of two structures, we obtain a bound state below the minimum threshold in the $cq\bar{q}\bar{q}$ system with the energy of $1998$ MeV, and the quantum number is $I{J}^P=\frac{1}{2}{0}^{+}$. Meanwhile, in the $bq\bar{q}\bar{q}$ system, two bound states with energies of $5414$ MeV and $5456$ MeV are obtained, and the quantum numbers are $I{J}^P=\frac{1}{2}{0}^{+}$ and $I{J}^P=\frac{1}{2}{1}^{+}$, respectively. Besides, we also employe the real-scaling method to search for resonance states in the $cq\bar{q}\bar{q}$ and $bq\bar{q}\bar{q}$ systems. Unfortunately, no genuine resonance states were obtained in both systems. We suggest future experiments to search for these three possible bound states.

    hep-phPRD(2024)·5 citations
11. 11*

    Probing Reheating with Graviton Bremsstrahlung

    Nicolás Bernal🇦🇪 · Simon Cléry🇫🇷 · Yann Mambrini🇫🇷 · Yong Xu🇩🇪

    We investigate the stochastic gravitational wave (GW) spectrum resulting from graviton bremsstrahlung during inflationary reheating. We focus on an inflaton $\varphi$ oscillating around a generic monomial potential $V(\varphi )\propto {\varphi }^n$, considering two different reheating scenarios: $i)$ inflaton decay and $ii)$ inflaton annihilation. We show that in the case of a quadratic potential, the scattering of the inflatons can give rise to larger GW amplitude than the decay channel. On the other hand, the GW spectrum exhibits distinct features and redshifts in each scenario, which makes it possible to distinguish them in the event of a discovery. Specifically, in the case of annihilation, the GW frequency can be shifted to values higher than those of decay, whereas the GW amplitude generated by annihilation turns out to be smaller than that in the decay case for $n\ge 4$, due to the different scaling of radiation during reheating. We also show that the differences in the GW spectrum become more prominent with increasing $n$. Finally, we highlight the potential of future high-frequency GW detectors to distinguish between the different reheating scenarios.

    hep-phastro-ph.COJCAP(2024)·57 citations
12. 12*

    One-loop Effective Action up to any Mass-dimension for Non-degenerate Scalars and Fermions including Light-Heavy Mixing

    Upalaparna Banerjee🇮🇳 · Joydeep Chakrabortty🇮🇳 · Shakeel Ur Rahaman🇬🇧 · Kaanapuli Ramkumar🇮🇳

    We propose a Heat-Kernel-based method to compute one-loop effective action up to any mass-dimension with arbitrary numbers of non-degenerate scalars and fermions. We demonstrate our prescription by computing the dimension six effective action for arbitrary numbers of non-degenerate scalars, which are consistent with degenerate results presented in prior studies. We have further shown that the effective action for any partially degenerate mass-spectrum can be easily derived from that for the non-degenerate case by employing suitable limits for masses. Our prescription allows us to express the effective action in terms of local operators for the scenarios that involve light-heavy mixing as well, simply by employing an infrared regulator in the non-degenerate action. Along with the formalism, we have also provided the algorithm and outlined the Mathematica program to compute the result up to any mass dimension.

    hep-phEur.Phys.J.Plus(2024)·19 citations
13. 13*

    No-$\pi$ schemes for multi-coupling theories

    I. Jack🇬🇧

    We show that even $\zeta$-functions may be removed from the $\beta$-functions of general multi-coupling theories up to high loop order by means of coupling redefinitions. For theories whose $\beta$-function is determined by the anomalous dimensions of the fields, such as supersymmetric theories, this corresponds to a renormalisation scheme change to a momentum subtraction scheme.

    hep-phhep-thPRD(2024)·5 citations
14. 14*

    Subleading power corrections for event shape variables in $e^{+}{e}^{-}$ annihilation

    Luca Buonocore🇨🇭 · Massimiliano Grazzini🇨🇭 · Flavio Guadagni🇨🇭 · Luca Rottoli🇨🇭

    We consider subleading power corrections to event shape variables in $e^{+}{e}^{-}$ collisions at the first order in the QCD coupling ${\alpha }_s$. We start from the jettiness variable ${\tau }_2$ and the $y_{23}$ resolution variable for the $k_T$ jet clustering algorithm and we analytically compute the corresponding cumulative cross section. We investigate the origin of the different power suppressed contributions in the two-jet limit and trace it back to their different coverage of the phase space. We extend our analysis to the case of thrust and of the $C$-parameter, and we finally discuss a class of observables that depend on a continuous parameter giving different weight to central and forward emissions and we evaluate the corresponding subleading power corrections.

    hep-phEPJC(2024)·7 citations
15. 15*

    Non-resonant Anomaly Detection with Background Extrapolation

    Kehang Bai🇺🇸 · Radha Mastandrea🇺🇸 · Benjamin Nachman🇺🇸

    Complete anomaly detection strategies that are both signal sensitive and compatible with background estimation have largely focused on resonant signals. Non-resonant new physics scenarios are relatively under-explored and may arise from off-shell effects or final states with significant missing energy. In this paper, we extend a class of weakly supervised anomaly detection strategies developed for resonant physics to the non-resonant case. Machine learning models are trained to reweight, generate, or morph the background, extrapolated from a control region. A classifier is then trained in a signal region to distinguish the estimated background from the data. The new methods are demonstrated using a semi-visible jet signature as a benchmark signal model, and are shown to automatically identify the anomalous events without specifying the signal ahead of time.

    hep-phhep-exphysics.data-anJHEP(2024)·12 citations
16. 16*

    Long-lived Searches of Vector-like Lepton and Its Accompanying Scalar at Colliders

    Qing-Hong Cao🇨🇳 · Jinhui Guo🇨🇳 · Jia Liu🇨🇳 · Yan Luo🇨🇳 · Xiao-Ping Wang🇨🇳

    Recently, the vector-like leptons (VLLs) as a simple extension to the standard model (SM) have attracted widespread attention both in theory and experiments. The present collider searches mainly focus on the studies of their prompt decays, which prefer a relatively large coupling. In this paper, we concentrate on searches for long-lived signatures of the singlet VLLs $F$ or their accompanying scalar particles $\varphi$ both in the hadronic and electronic colliders. The long-lived signatures are naturally induced from small chiral mass mixing between VLLs and SM leptons. Two specific models distinguished by whether the VLLs couple to scalar particles are introduced to realize the aforementioned features. For long-lived VLLs case, we find that with the kink track method the sensitivities at future HL-LHC with $\sqrt{s}=14\text{TeV}$ can reach the regions for VLL mass $m_F\in [200,1100]\text{GeV}$ and the mass mixing parameter ${\theta }_L\in [10^{-10},3\times 10^{-8}]$. For the long-lived accompanying scalar particle case, by fixing VLLs or scalar mass, or the mass ratio between VLL and the accompanying scalar, we explore the projected sensitivities through the time delay and displaced vertex strategies, which can probe the regions for $m_F\in [200,1200]\text{GeV}$ and coupling $y{\theta }_L\in [10^{-11},10^{-6}]$. Furthermore, we also explore the long-lived accompanying scalars at the future CEPC provided that the VLLs can couple to the SM first-generation leptons. We find that CEPC has good performances for $m_{\varphi }<120\text{GeV}$ and $m_F<1200\text{GeV}$. These long-lived searches are complementary to previous studies, which opens the door towards the smaller coupling regions.

    hep-phPRD(2024)·19 citations
17. 17*

    Measurements and EFT fits on detector level

    Kelci Mohrman (for the ATLAS and CMS Collaborations)🇺🇸

    The framework of standard model effective field theory (SMEFT) provides a relatively model-agnostic tool with which to parameterize the off-shell effects of potential heavy new physics. In the top quark sector, the ATLAS and CMS experiments make use of data collected by the CERN LHC to search for these off-shell effects by probing dimension-six SMEFT operators involving top quarks. The analyses employ a variety of approaches, which range from relatively indirect (e.g. reinterpretations of unfolded measurements) to relatively direct (in which the SMEFT effects are propagated all the way to detector-level predictions). These proceedings discuss the landscape of detector-level SMEFT analyses in ATLAS and CMS, describe the methodology of the direct detector-level approach, and summarize several recent experimental results.

    ↳ hep-exhep-ph0 citations
18. 18*

    Analytical models of supermassive black holes in galaxies surrounded by dark matter halos

    Zibo Shen🇺🇸 · Anzhong Wang🇺🇸 · Yungui Gong🇨🇳 · Shaoyu Yin🇨🇳

    In this Letter, we present five analytical models in closed forms, each representing a supermassive black hole (SMBH) located at the center of a galaxy surrounded by dark matter (DM) halo. The density profile of the halo vanishes inside twice the Schwarzschild radius of the hole and satisfies the weak, strong, and dominant energy conditions. The spacetime are asymptotically flat, and the difference among the models lies in the slopes of the density profiles in the spike and regions far from the center of the galaxy. Three of them represent cusp models, whereas the other two represent core models. With the well-known (generalized) Newman-Janis algorithm, rotating SMBHs with DM halos can be easily constructed from these models.

    ↳ gr-qcastro-ph.COhep-phhep-thPLB(2024)·64 citations
19. 19*

    Gravitational Wave Signals From Early Matter Domination: Interpolating Between Fast and Slow Transitions

    Matthew Pearce🇦🇺 · Lauren Pearce🇺🇸 · Graham White🇬🇧 · Csaba Balázs🇦🇺

    An epoch of matter domination in the early universe can enhance the primordial stochastic gravitational wave signal, potentially making it detectable to upcoming gravitational wave experiments. However, the resulting gravitational wave signal is quite sensitive to the end of the early matter-dominated epoch. If matter domination ends gradually, a cancellation results in an extremely suppressed signal, while in the limit of an instantaneous transition, there is a resonant-like enhancement. The end of the matter dominated epoch cannot be instantaneous, however, and previous analyses have used a Gaussian smoothing technique to account for this, and consider only a limited regime around the fast transition limit. In this work, we present a study of the enhanced gravitational wave signal from early matter domination without making either approximation and show how the signal smoothly evolves from the strongly suppressed to strongly enhanced regimes.

    ↳ astro-ph.COgr-qchep-phJCAP(2024)·50 citations
20. 20*

    Flux Landscape with Enhanced Symmetry Not on $SL(2,\mathbb{Z})$ Elliptic Points

    Keiya Ishiguro🇯🇵 · Takafumi Kai🇯🇵 · Tatsuo Kobayashi🇯🇵 · Hajime Otsuka🇯🇵

    We study structures of solutions for SUSY Minkowski F-term equations on two toroidal orientifolds with $h^{2,1}=1$. Following our previous study \cite{Ishiguro:2020tmo}, with fixed upper bounds of a flux D3-brane charge $N_{\mathrm{flux}}$, we obtain a whole Landscape and a distribution of degeneracies of physically-distinct solutions for each case. In contrast to our previous study, we consider a non-factorizable toroidal orientifold and its Landscape on which $SL(2,\mathbb{Z})$ is violated into a certain congruence subgroup, as it had been known in past studies. We find that it is not the entire duality group that a complex-structure modulus $U$ enjoys but its outer semi-direct product with a "scaling" outer automorphism group. The fundamental region is enlarged to include the $|U|<1$ region. In addition, we find that high degeneracy is observed at an elliptic point, not of $SL(2,Z)$ but of the outer automorphism group. Furthermore, ${\mathbb{Z}}_2$-enhanced symmetry is realized on the elliptic point. The outer automorphism group is exceptional in the sense that it is consistent with a symplectic basis transformation of background three-cycles, as opposed to the outer automorphism group of $SL(2,\mathbb{Z})$. We also compare this result with Landscape of another factorizable toroidal orientifold.

    ↳ hep-thhep-phJHEP(2024)·10 citations
21. 21*

    Magnetic helicity in rotating neutron stars

    Maxim Dvornikov (IZMIRAN)🇷🇺

    We study the magnetic helicity evolution in neutron stars (NSs). First, we analyze how the surface terms affect the conservation law for the sum of the chiral imbalance of the charged particle densities and the density of the magnetic helicity. Our results are applied to a system with a finite volume, which can be a magnetized NS. We show that the contribution of these surface terms can potentially lead to the reconnection of magnetic field lines followed by X-ray or gamma bursts observed in magnetars. Comparing the new quantum surface term with the classical contribution known in the standard magnetic hydrodynamics, we obtain that its contribution dominates over the classical term only for NS with a rigid rotation. Second, we study the dynamics of chiral electrons which interact electroweakly with a background fermions having the velocity, arbitrarily depending on spatial coordinates, and the nonuniform density. We derive the the kinetic equations and the effective action for right and left particles. The correction to the Adler anomaly and to the anomalous electric current are obtained in the case of a rotating matter. Then, the obtained results are applied for the study of the magnetic helicity flow inside a magnetized rotating NS. We compute the characteristic time of the helicity change and demonstrate that it coincides with the the magnetic cycle period of certain pulsars.

    ↳ astro-ph.HEhep-ph0 citations
22. 22*

    Phi4tools: Compilation of Feynman diagrams for Landau-Ginzburg-Wilson theories

    Giacomo Sberveglieri🇮🇹 · Gabriele Spada🇮🇹

    Scalar field theories with quartic interactions are of central interest in the study of second-order phase transitions. For three-dimensional theories, numerous studies make use of the fixed-dimensional perturbative computation of [B. Nickel, D. Meiron, and G. Baker Jr, Compilation of 2-pt and 4-pt graphs for continuous spin model, University of Guelph report (1977)], unfortunately left unpublished. We independently verify the results of Nickel et al., and we extend the computation to the eighth order in the coupling constant. The results of our calculations, together with the tools developed, are made available in Phi4tools, a user-friendly package that allows displaying the information about the individual Feynman diagrams, including the numerical values for the diagrams for zero, two, and four-point functions. We also provide the perturbative series up to order eight for the renormalization-group functions for the $O(N)$ and cubic anisotropic models.

    ↳ hep-thcond-mat.stat-mechhep-phJHEP(2024)·5 citations
23. 23*

    Weyl orbits as probe of chiral separation effect in magnetic Weyl semimetals

    M.A.Zubkov🇮🇱

    We consider magnetic Weyl semimetals. First of all we review relation of intrinsic anomalous Hall conductivity, band contribution to intrinsic magnetic moment, and the conductivity of chiral separation effect (CSE) to the topological invariants written in terms of the Wigner transformed Green functions (with effects of interaction and disorder taken into account). Next, we concentrate on the CSE. The corresponding bulk axial current is accompanied by the flow of the states in momentum space along the Fermi arcs. Together with the bulk CSE current this flow forms closed Weyl orbits. Their detection can be considered as experimental discovery of chiral separation effect. Previously it was proposed to detect Weyl orbits through the observation of quantum oscillations \cite{Potter_2014} . We propose the alternative way to detect existence of Weyl orbits through the observation of their contributions to Hall conductance.

    ↳ cond-mat.mes-hallhep-phJ.Phys.Condens.Matter(2024)·6 citations
24. 24*

    One consistency relation for all single-field inflationary models

    Mohammad Hossein Namjoo🇮🇷

    In this paper, we present a non-Gaussianity consistency relation that enables the calculation of the squeezed limit bispectrum of the curvature perturbation in single-field inflationary models by carefully inspecting the background evolution and the linear perturbation theory. The consistency relation is more general than others in the literature since it does not require any specific symmetry, conservation of the curvature perturbation at large scales, attractor background evolution or canonical kinetic energy of the inflaton field. We demonstrate that all known examples of the squeezed limit bispectrum in single-field models of inflation can be reproduced within this framework.

    ↳ astro-ph.COhep-phhep-thJCAP(2024)·9 citations
25. 25*

    Propagator zeros and lattice chiral gauge theories

    Maarten Golterman🇺🇸 · Yigal Shamir🇮🇱

    Symmetric mass generation (SMG) has been advocated as a mechanism to render mirror fermions massive without symmetry breaking, ultimately aiming for the construction of lattice chiral gauge theories. It has been argued that in an SMG phase, the poles in the mirror fermion propagators are replaced by zeros. Using an effective lagrangian approach, we investigate the role of propagator zeros when the gauge field is turned on, finding that they act as coupled ghost states. In four dimensions, a propagator zero makes an opposite-sign contribution to the one-loop beta function as compared to a normal fermion. In two dimensional abelian theories, a propagator zero makes a negative contribution to the photon mass squared. In addition, propagator zeros generate the same anomaly as propagator poles. Thus, gauge invariance will always be maintained in an SMG phase, in fact, even if the target chiral gauge theory is anomalous, but unitarity of the gauge theory is lost.

    ↳ hep-latcond-mat.str-elhep-phhep-thPRL(2024)·18 citations
26. 26*

    Modified Kerr black holes surrounded by dark matter spike

    Salvatore Capozziello🇮🇹 · Soroush Zare🇪🇸 · Luis M. Nieto🇪🇸 · Hassan Hassanabadi🇨🇿

    We study supermassive black holes (SMBH), surrounded by a dark matter (DM) spike, that can be found at the centers of Milky Way and $\text{M87}$ galaxies and are accompanied by a specific kind of topological defect. The investigation is developed within the framework of Bumblebee Gravity with a global monopole (BGGM). The dark matter spike is described by a power-law density profile. Our main objective is to assess how the background arising from spontaneous Lorentz symmetry breaking and the presence of a global monopole influence the properties of the Kerr BH within the region affected by the spike. Using a spherically symmetric static BH with BGGM properties as the seed metric, we construct a non-rotating spacetime with a DM spike, resulting in a BGGM-motivated Schwarzschild-like BH by solving the modified Tolman-Oppenheimer-Volkoff equations (TOV). Next, we extend this approach to the case of a rotating spacetime resulting in the BGGM-motivated Kerr-like BH (BGMKLBH). This approach allows us to explore the spacetime structure, and the BGMKLBH shadows. Then, using available observational data for the DM spike density and considering the effects of BGGM on ${\text{Sgr A}}^{\ast }$ and ${\text{M87}}^{\ast }$ SMBHs, we analyse the shapes of their shadows and put constraints on the BGGM parameter. Thus, we infer that the BGMKLBHs could be reliable candidates for the astrophysical BHs.

    ↳ gr-qchep-phPhys.Dark Univ.(2025)·51 citations
27. 27*

    Determining the spin of light primordial black holes with Hawking radiation II: high spin regime

    Marco Calzà🇵🇹 · João G.Rosa🇵🇹

    We propose a method to determine the mass and spin of primordial black holes based on measuring the energy and emission rate at the dipolar and quadrupolar peaks in the primary photon Hawking spectrum, applicable for dimensionless spin parameters $\tilde{a}\gtrsim 0.6$. In particular, we show that the ratio between the energies of the two peaks is only a function of the black hole spin, while the ratio between their emission rates depends also on the line-of-sight inclination. The black hole mass and distance from the Earth may then be inferred from the absolute values of the peak energies and emission rates. This method is relevant for primordial black holes born with large spin parameters that are presently still in the early stages of their evaporation process.

    ↳ gr-qcastro-ph.HEhep-phJHEP(2024)·11 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.