Wed·Feb 5, 2025Wednesday·February 5, 2025

1. 01*

   Type-II Seesaw Mechanism for Dirac Neutrinos and its Implications on $N_{\text{eff}}$ and Lepton Flavor Violation in a 3-3-1 model

   Vinícius Oliveira🇵🇹 · Patricio Escalona🇧🇷 · Lucia Angel🇧🇷 · C. A. de S. Pires🇧🇷 · Farinaldo S. Queiroz🇧🇷

   In this study, we implement the type-II seesaw mechanism for Dirac neutrino masses within the framework of a 3-3-1 model. To this end, we introduce a scalar sextet and impose both lepton number conservation and invariance under a discrete $Z_2$ symmetry in the Lagrangian. This mechanism naturally generates small Dirac neutrino masses by allowing the soft breaking of the $Z_2$ symmetry through a unique term in the scalar potential, while preserving lepton number. Specifically, we explore the realization of this model at low-energy scales. Regarding flavor implications, we analyze its contributions to the rare decay processes $\mu \to e\gamma$ and $\mu \to \bar{e}ee$. In the cosmological context, we analyze the influence of right-handed neutrinos on the effective number of neutrino species, $N_{\text{eff}}$, through interactions mediated by the $Z^{\prime }$ boson. Our findings establish a lower bound of $m_{Z^{\prime }}>4.4$ TeV, which slightly exceeds the current lower limit set by the Large Hadron Collider (LHC).

   hep-phJHEP(2025)·5 citations
2. 02*

   Dynamical Solution to the Eta Problem in Spectator Field Models

   Sana Elgamal🇺🇸 · Keisuke Harigaya🇺🇸

   We study a class of spectator field models that addresses the eta problem while providing a natural explanation for the observed slight deviation of the spectrum of curvature perturbations from scale-invariance. In particular, we analyze the effects of quantum corrections on the quadratic potential of the spectator field given by its gravitational coupling to the Ricci scalar and the inflaton energy, so-called the Hubble-induced mass term. These quantum corrections create a minimum around which the potential is flatter and to which the spectator field is attracted. We demonstrate that this attractor dynamics can naturally generate the observed slightly red-tilted spectrum of curvature perturbations. Furthermore, focusing on a curvaton model with a quadratic vacuum potential, we compute the primordial non-Gaussianity parameter $f_{\text{NL}}$ and derive a predictive relationship between $f_{\text{NL}}$ and the running of the scalar spectral index. This relationship serves as a testable signature of the model. Finally, we extend the idea to a broader class of models where the spectator field is an angular component of a complex scalar field.

   hep-phastro-ph.COJCAP(2025)·1 citation
3. 03*

   Lévy $\alpha$-stable generalization of the ReBB model of elastic proton-proton and proton-antiproton scattering

   T. Csörgő🇭🇺 · S. Hegyi🇭🇺 · I. Szanyi🇭🇺

   The Lévy $\alpha$-stable generalization of the ReBB model of elastic proton-proton and proton-antiproton scattering is presented. The motivation for the future use of this model in describing experimental data is discussed.

   hep-phActa Phys.Polon.Supp.(2025)·0 citations
4. 04*

   Renormalization of the Next-to-Leading-Power Soft Function for the Drell-Yan Off-diagonal Channel

   Martin Beneke🇩🇪 · Yao Ji🇩🇪 · Erik Sünderhauf🇩🇪 · Xing Wang🇩🇪

   We renormalize the soft function entering the factorization and resummation of the $qg$ parton-scattering channel of the Drell-Yan process near the kinematic threshold $\hat{s}\to Q^2$ at next-to-leading power in the expansion around $z\equiv Q^2/\hat{s}=1$, and solve its renormalization-group equation.

   hep-phhep-thJHEP(2025)·4 citations
5. 05*

   Finite temperature QCD crossover at non-zero chemical potential: A Dyson-Schwinger approach

   Arpan Chatterjee🇪🇪 · Marco Frasca🇮🇹 · Anish Ghoshal🇵🇱 · Stefan Groote🇪🇪

   We study QCD at finite temperature and non-zero chemical potential to derive the critical temperature at the chiral phase transition (crossover). We solve a set of Dyson--Schwinger partial differential equations using the exact solution for the Yang--Mills quantum field theory based on elliptical functions. We derive a Nambu-Jona--Lasino (NJL) model of the quarks and obtain a very good agreement with recent lattice computations regarding the dependence of the critical temperature on the strong coupling scale. The solution depends on a single scale parameter, as typical for the theory and already known from studies about asymptotic freedom. The study is analytically derived from QCD.

   hep-phhep-lathep-thNPB(2025)·1 citation
6. 06*

   Model Independent Effective Dimension Six Operators And Scattering Unitarity

   Swagata Ghosh🇮🇳 · Rashidul Islam🇮🇳

   The effective field theory containing higher dimensional operators violates the unitarity of the $2\to 2$ scattering processes in the Standard Model. This unitarity violation depends on the values of the Wilson coefficients corresponding to a higher dimensional operator. We showed that even a small values of some of the Wilson coefficients lead to the unitarity violation at the LHC centre of mass energies. Considering the final states as the gauge bosons in the longitudinal mode, the scalars, and the $t\overline{t}$, we showed that the unitarity violation in $WW\to WW$, $WW\to ZZ$, and $ZZ\to hh$ scattering amplitudes sets bounds on the Wilson coefficients of the dimension six effective operators.

   hep-phSpringer Proc.Phys.(2026)·0 citations
7. 07*

   Probing New Physics with Multi-Messenger Astronomy

   P. S. Bhupal Dev🇺🇸

   The burgeoning field of multi-messenger astronomy is poised to revolutionize our understanding of the most enigmatic astrophysical phenomena in the Universe. At the same time, it has opened a new window of opportunity to probe various particle physics phenomena. This is illustrated here with a few example new physics scenarios, namely, decaying heavy dark matter, pseudo-Dirac neutrinos and light dark sector physics, for which new constraints are derived using recent multi-messenger observations.

   hep-phastro-ph.HESpringer Proc.Phys.(2026)·0 citations
8. 08*

   The real corrections to the Higgs impact factor at next-to-leading order with finite top mass

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

   This work presents the computation of real corrections to the impact factor for forward Higgs boson production, preserving the full dependence on the top-quark mass. The results are shown to align with the BFKL factorization framework, particularly in reproducing the expected rapidity divergence. Additionally, the subtraction of this divergence has been demonstrated using the appropriate counterterm within the BFKL scheme. In the infinite-top-mass limit, our findings reproduce the previously established result.

   hep-phActa Phys.Polon.Supp.(2025)·4 citations
9. 09*

   Sensitivity of Double Deeply Virtual Compton Scattering observables to Generalized Parton Distributions

   J. S. Alvarado🇫🇷 · M. Hoballah🇫🇷 · E. Voutier🇫🇷

   Double Deeply Virtual Compton Scattering (DDVCS) is a promising channel for Generalized Parton Distribution (GPD) studies as it is a generalization of the Deeply Virtual Compton Scattering (DVCS) and Timelike Compton Scattering (TCS) processes. Contrary to DVCS and TCS, the GPD phase space accessed through DDVCS is not constrained by on-shell conditions on the incoming and outgoing photons thus allowing unrestricted GPD extraction from experimental observables. Considering polarized electron and positron beams directed to a polarized proton target, we study the sensitivity of the DDVCS cross-section asymmetries to the chiral-even proton GPDs from different model predictions. The feasibility of such measurements is further investigated in the context of the CLAS and SoLID spectrometers at the Thomas Jefferson National Accelerator Facility and the future Electron-Ion Collider at the Brookhaven National Laboratory.

   hep-phnucl-exPRC(2025)·10 citations
10. 10*

    The Spectrum of Global Axion Strings

    Mathieu Kaltschmidt🇪🇸 · Javier Redondo🇪🇸 · Ken'ichi Saikawa🇯🇵 · Alejandro Vaquero🇪🇸

    The post-inflationary Peccei-Quinn (PQ) symmetry breaking scenario provides a unique opportunity to pinpoint the QCD axion dark matter mass, which is a crucial input for laboratory experiments that are designed for probing specific mass ranges. Predicting their mass requires a precise knowledge of how axions are produced from the decay of topological defects in the early Universe that are inevitably formed. In this contribution, we present recent results on the analysis of the spectrum of axions radiated from global strings based on large scale numerical simulations of the cosmological evolution of the PQ field on a static lattice. We highlight several systematic effects that have been overlooked in previous works, such as the dependence on the initial conditions, contaminations due to oscillations in the spectrum, and discretisation effects; some of which could explain the discrepancy in the current literature. Taking these uncertainties into account and performing the extrapolation to cosmologically relevant string tensions, we find that the dark matter mass is predicted to be in the range of $95\mu \text{eV}\lesssim m_a\lesssim 450\mu \text{eV}$, which will be probed by some of the next generation direct detection experiments.

    hep-phastro-ph.COPoS(2025)·5 citations
11. 11*

    A short review on the compositeness of the $X(3872)$

    Angelo Esposito🇮🇹 · Alfredo Glioti🇮🇹 · Davide Germani🇮🇹 · Antonio D. Polosa🇮🇹

    The $X(3872)$ could be a shallow $D{\bar{D}}^{\ast }$ bound state, a compact four-quark state, or a partially composite particle, i.e. a superposition of the two. We will review how these hypotheses could be tested experimentally, examining especially the cases in which the $X$ is a pure bound state or a pure compact tetraquark. Data on $X\to D\bar{D}\pi$ decays are compared with the analysis of the $X$ lineshape. The pure bound state hypothesis corresponds to a well-defined region in parameter space defined by the width of the $D^{\ast }$ versus the binding energy of the $X$. As for the $X$ lineshape, we observe that the currently available experimental analysis tests the compatibility with the compact hypothesis for the $X$. We propose how to extend the analysis to examine the molecular or the partially composite hypotheses. We also review the analysis on the radiative decays of the $X$ including pion corrections confirming some conclusions reached in the literature on the use of the universal wave function description for the molecular $X$.

    hep-phRiv.Nuovo Cim.(2025)·20 citations
12. 12*

    Neutrino Induced Charged Current Coherent Pion Production for Constraining the Muon Neutrino Flux at DUNE

    Mun Jung Jung🇺🇸 · Vishvas Pandey🇺🇸 · Gray Putnam🇺🇸 · David W. Schmitz🇺🇸

    We study neutrino induced charge current coherent pion production (${\nu }_{\mu }\text{CC-Coh}\pi$) as a tool for constraining the neutrino flux at the Deep Underground Neutrino Experiment (DUNE). The neutrino energy and flavor in the process can be directly reconstructed from the outgoing particles, making it especially useful to specifically constrain the muon neutrino component of the total flux. The cross section of this process can be obtained using the Adler relation with the $\pi$-Ar elastic scattering cross section, taken either from external data or, as we explore, from a simultaneous measurement in the DUNE near detector. We develop a procedure that leverages ${\nu }_{\mu }\text{CC-Coh}\pi$ events to fit for the neutrino flux while simultaneously accounting for relevant effects in the cross section. We project that this method has the statistical power to constrain the uncertainty on the normalization of the flux at its peak to a few percent. This study demonstrates the potential utility of a ${\nu }_{\mu }\text{CC-Coh}\pi$ flux constraint, though further work will be needed to determine the range of validity and precision of the Adler relation upon which it relies, as well as to measure the $\pi$-Ar elastic scattering cross section to the requisite precision. We discuss the experimental and phenomenological developments necessary to unlock the ${\nu }_{\mu }\text{CC-Coh}\pi$ process as a "standard candle'' for neutrino experiments.

    hep-phhep-exnucl-thPRD(2026)·2 citations
13. 13*

    Small-$x$ factorisation in the target fragmentation region

    Paul Caucal🇫🇷 · Farid Salazar🇺🇸

    We consider the differential cross-section for single-inclusive jet production with transverse momentum $P_{\perp }$ in Deep Inelastic Scattering (DIS) at small Bjorken $x_{\mathrm{Bj}}$, mediated by a virtual photon with virtuality $Q^2$. Unlike most studies at small $x$, which focus on particle production in the current fragmentation region, we investigate the kinematic regime where the jet is produced in the target fragmentation hemisphere of the Breit frame, and with $P_{\perp }\ll Q$. For a longitudinally polarised photon, we demonstrate that this cross-section is not power suppressed in $P_{\perp }/Q$ and we derive a factorised expression in terms of extended quark and gluon jet fracture functions. Our formula, valid at next-to-leading order in ${\alpha }_s$ at small $x$, is akin to the Altarelli-Martinelli identity for the longitudinal DIS structure function. Numerical estimates show that the extended quark jet fracture function is the most sensitive to saturation effects in large nuclei.

    hep-phnucl-thPRL(2026)·13 citations
14. 14*

    Ball Lightning as a profound manifestation of the Dark Matter physics

    Ariel Zhitnitsky🇨🇦

    Ball lighting (BL) has been observed for centuries. There are large number of books, review articles, and original scientific papers devoted to different aspects of BL phenomenon. Yet, the basic features of this phenomenon have never been explained by known physics. The main problem is the source which could power the dynamics of the BL. We advocate an idea that the dark matter (DM) in form of the axion quark nuggets (AQN) made of standard model quarks and gluons (similar to the old idea of the Witten's strangelets) could internally generate the required power. The AQN model was invented long ago without any relation to the BL physics. It was invented with a single motivation to explain the observed similarity ${\Omega }_{\mathrm{DM}}\sim {\Omega }_{\mathrm{visible}}$ between visible and DM components. This relation represents a very generic feature of this framework, not sensitive to any parameters of the construction. However, with the same set of parameters being fixed long ago this model is capable to address the key elements of the BL phenomenology, including the source of the energy powering the BL events. In particular, we argue that the visible size of BL, its typical life time, the frequency of appearance, etc are all consistent with suggested proposal when BL represents a profound manifestation of the DM physics represented by the AQN objects. We also argue that some of the Unidentified Aerial Phenomena (UAP) might be closely related to BL events, and therefore also represent profound manifestations of the DM physics within AQN framework. We also formulate a number of specific possible tests which can refute or unambiguously substantiate this unorthodox proposal on nature of BL and UAP.

    hep-phastro-ph.EPastro-ph.HEphysics.ao-phUniverse(2025)·3 citations
15. 15*

    Theory of resonances

    Maxim Mai🇺🇸

    We give a pedagogical introduction to the theory of resonances, focusing specifically on the spectrum of excited strongly interacting particles. After providing historical context starting from the atomic theory, we summarize the status of theoretical and experimental research. We discuss then the methodology to determine universal resonance parameter through the analytical properties of the transition amplitudes. For this, the main aspects of the $S$-matrix theory are introduced including some explicit calculations in simplified cases. In the last section, we summarize several frequently used amplitude types also making a connection to Effective Field Theories, as well as provide first glimpse into some more advanced applications to further resonance properties.

    hep-phnucl-th13 citations
16. 16*

    Particle Theory and Theoretical Cosmology Dedicated to Professor Paul Howard Frampton on the Occasion of his 80th Birthday

    Thomas W. Kephart🇺🇸 · Paul H. Frampton🇮🇹

    After a Preface written by the Editors, there follow twelve papers submitted by theoretical physicists from Asia, Europe and the USA.

    hep-phEntropy·0 citations
17. 17*

    Simulations of Magnetic Monopole Collisions

    Maximilian Bachmaier🇩🇪 · Gia Dvali🇩🇪 · Josef Seitz🇮🇱 · Juan Sebastián Valbuena-Bermúdez🇪🇸

    In this paper, we investigate the scattering of BPS magnetic monopoles through numerical simulations. We present an ansatz for various multi-monopole configurations suitable for analyzing monopole scattering processes. Our study includes planar scattering scenarios involving two, three, and four monopoles, as well as non-planar processes where three and four monopoles form intermediate tetrahedral and cubic states, respectively. Our observations align with the theoretical predictions of the moduli space approximation. Furthermore, we extend our analysis to relativistic velocities and explore parameters beyond the BPS limit.

    ↳ hep-thhep-phmath-phmath.MPPRD(2025)·13 citations
18. 18*

    Real-Time Scattering Processes with Continuous-Variable Quantum Computers

    Steven Abel🇬🇧 · Michael Spannowsky🇬🇧 · Simon Williams🇬🇧

    We propose a framework for simulating the real-time dynamics of quantum field theories (QFTs) using continuous-variable quantum computing (CVQC). Focusing on ($1+1$)-dimensional ${\phi }^4$ scalar field theory, the approach employs the Hamiltonian formalism to map the theory onto a spatial lattice, with fields represented as quantum harmonic oscillators. Using measurement-based quantum computing, we implement non-Gaussian operations for CQVC platforms. The study introduces methods for preparing initial states with specific momenta and simulating their evolution under the ${\phi }^4$ Hamiltonian. Key quantum objects, such as two-point correlation functions, validate the framework against analytical solutions. Scattering simulations further illustrate how mass and coupling strength influence field dynamics and energy redistribution. Thus, we demonstrate CVQC's scalability for larger lattice systems and its potential for simulating more complex field theories.

    ↳ quant-phhep-lathep-phhep-thPRA(2025)·27 citations
19. 19*

    Zero Modes on the Light Front

    S.S. Chabysheva🇺🇸 · J.R. Hiller🇺🇸

    Modes with zero longitudinal light-front momentum (zero modes) do have roles to play in the analysis of light-front field theories. These range from improvements in convergence for numerical calculations to implications for the light-front vacuum and beyond to fundamental issues in the connection with equal-time quantization. In particular, the discrepancy in values of the critical coupling for ${\varphi }_{1+1}^4$ theory, between equal-time and light-front quantizations, would appear to be resolvable with the proper treatment of zero modes and near-zero modes. We provide a survey of these issues and point to open questions.

    ↳ hep-thhep-phEur.Phys.J.ST(2026)·3 citations
20. 20*

    Renormalon-like factorial enhancements to power expansion/OPE in a super-renormalizable 2D $O(N)$ quartic model

    Yizhuang Liu🇵🇱

    In this work, we investigate the effects of logarithms on the asymptotic behavior of power expansion/OPE in supper-renormalizable QFTs. We performed a careful investigation of the large $p^2$ expansion of a scalar-scalar two-point function at the next-to-leading order in the large-$N$ expansion, in a large-$N$ $O(N)$ quartic model that is populated by logarithms. We show that because the large-$p^2$ logarithms of the individual bubbles can be amplified by bubble-chains, there are factorial enhancements to the power expansion. We show how the factorial enhancements appear separately in the coefficient functions and operator condensates, and demonstrate how they are cancelled off-diagonally across different powers. Restricted to any given power, the factorial enhancements are no-longer canceled. The large-$p^2$ power expansion is divergent.

    ↳ hep-thhep-phmath-phmath.MPJHEP(2025)·3 citations
21. 21*

    A Fuzzy Axiverse from String Theory

    Andreas Schachner🇩🇪

    In this talk, I showcase models for fuzzy axion dark matter within the framework of type IIB string theory, focusing on axions originating from the Ramond-Ramond four-form in compactifications on Calabi-Yau orientifold hypersurfaces. These models are amenable to cosmological tests if a substantial relic abundance of fuzzy dark matter is produced. I present a topologically exhaustive ensemble of more than 350{,}000 Calabi-Yau compactifications with up to seven axions together with a systematic analysis of the misalignment production of fuzzy dark matter. The resulting dark matter composition is generally a mixture of fuzzy axions and heavier axions, including the QCD axion. Dark photons frequently emerge due to the orientifold projection. I will also comment on applications of optimisation strategies based on automatic differentiation for exploring the string axiverse. This talk is partially based on arXiv:2412.12012.

    ↳ hep-thhep-phPoS(2025)·0 citations
22. 22*

    Absorption of $\psi (2S)$ mesons in nuclei

    E. Ya. Paryev🇷🇺

    In the present work we explore the inclusive $\psi (2S)$ meson photoproduction from nuclei near the kinematic threshold within the collision model, based on the nuclear spectral function, for incoherent direct photon--nucleon charmonium creation processes. The model takes into account the final $\psi (2S)$ absorption, target nucleon binding and Fermi motion. We calculate the absolute and relative excitation functions for production of $\psi (2S)$ mesons on ${}^{12}$C and ${}^{184}$W target nuclei at near-threshold photon beam energies of 8.0--16.4 GeV, the absolute momentum differential cross sections for their production off these target nuclei at laboratory polar angles of 0${}^{\circ }$--10${}^{\circ }$, the momentum dependence of the ratio of these cross sections as well as the A-dependences of the ratios (transparency ratios) of the total cross cross sections for $\psi (2S)$ production at photon energy of 13 GeV within the different scenarios for the $\psi (2S)N$ absorption cross section. We also calculate the A-dependence of the ratio of $\psi (2S)$ and $J/\psi$ photoproduction transparency ratios at photon energies around of 11.5 GeV within the adopted scenarios for this cross section. We demonstrate that both the absolute and relative observables considered reveal a definite sensitivity to these scenarios. Therefore, the measurement of such observables in future experiments at the upgraded up to 22 GeV CEBAF facility in the near-threshold energy region might shed light both on the $\psi (2S)N$ absorption cross section and on its part associated with the nondiagonal process $\psi (2S)+N\to J/\psi +N$ at finite momenta, which are of crucial importance in understanding of charmonium production and suppression in high-energy nucleus--nucleus collisions in a search for the quark-gluon plasma.

    ↳ nucl-thhep-phnucl-exNPA(2025)·1 citation
23. 23*

    Primordial Black Hole Formation via Inverted Bubble Collapse

    Kai Murai🇯🇵 · Kodai Sakurai🇯🇵 · Fuminobu Takahashi🇯🇵

    We propose a novel mechanism of primordial black hole (PBH) formation through inverted bubble collapse. In this scenario, bubbles nucleate sparsely in an incomplete first-order phase transition, such that they remain isolated and do not percolate or collide with each other due to the extremely low nucleation rate. This is followed by a bulk phase transition in the rest of the universe that inverts these pre-existing bubbles into false vacuum regions. These spherically symmetric false-vacuum bubbles subsequently collapse to form PBHs. Unlike conventional PBH formation mechanisms associated with domain wall collapse or bubble coalescence, our inverted bubble collapse mechanism naturally ensures spherical collapse. We demonstrate that, when applied to the singlet extension of the Standard Model, this mechanism can produce highly monochromatic PBHs with masses up to $\mathcal{O}(10^{-7}\text{-}10^{-5})M_{\odot }$, which potentially explain the microlensing events observed in the OGLE and Subaru HSC data.

    ↳ astro-ph.COhep-phJHEP(2025)·18 citations
24. 24*

    Extended Effective Field Theory of Dark Energy: Ghost Condensate Dark Energy with Sextic Dispersion Relation in de Sitter Spacetime

    A. Ashoorioon🇮🇷 · M. B. Jahani Poshteh🇮🇷 · A. Yousefi-Sostani🇮🇷

    We continue our studies of the ghost condensate (GC) with sixth-order dispersion relation. Contrary to the GC with quartic dispersion relation, we find that the correction to the Newtonian potential explicitly depends on the space and time dependence of matter density. At late times when the Newtonian potential becomes time-independent, one obtains similar oscillatory behavior at the distance $\frac{M_{\text{Pl}}}{M^2}$, but this time at the time scale $\frac{M^4}{M_{\text{Pl}}^3}$, where $M^2$ is the ghost field velocity. We also show that the speed of gravitational wave is modified in a frequency dependent manner at momenta close to $\frac{M_{\text{Pl}}}{\sqrt{|{\sigma }_1|}}$, where ${\sigma }_1$ is the coefficient of ${\gamma }^{ij}{\nabla }_i{K}_{lr}{\nabla }_j{K}^{lr}$ operator in the unitary gauge action.

    ↳ hep-thastro-ph.COgr-qchep-ph0 citations
25. 25*

    An Alcock-Paczynski Test on Reionization Bubbles for Cosmology

    Emilie Thélie · Franco Del Balso · Julian B. Muñoz🇺🇸 · Adrian Liu🇨🇦

    In this paper, we propose an Alcock-Paczyński (AP) test to constrain cosmology using HII bubbles during the Epoch of Reionization. Similarly to cosmic voids, a stack of HII bubbles is spherically symmetric because ionizing fronts propagate isotropically on average (even if individual bubbles may not be spherical), making them standard spheres to be used in an AP test. Upcoming 21-cm observations, from the Square Kilometer Array (SKA) for instance, will contain tomographic information about HII regions during reionization. However, extracting the bubbles from this signal is made difficult because of instrumental noise and foreground systematics. Here, we use a neural network to reconstruct neutral-fraction boxes from the noisy 21-cm signal, from which we extract bubbles using a watershed algorithm. We then run the purely geometrical AP test on these stacks, showing that a SKA-like experiment will be able to constrain the product of the angular-diameter distance $D_{\text{A}}$ and Hubble parameter $H$ at reionization redshifts with $\sim 2\%$ precision, robustly to astrophysical and cosmological uncertainties within the models tested here. This AP test, whether performed on 21-cm observations or other large surveys of ionized bubbles, will allow us to fill the knowledge gap about the expansion rate of our Universe at reionization redshifts.

    ↳ astro-ph.COastro-ph.GAhep-phPRD(2025)·7 citations
26. 26*

    Phase space fractons

    Ylias Sadki · Abhishodh Prakash · S. L. Sondhi · Daniel P. Arovas

    Perhaps the simplest approach to constructing models with sub-dimensional particles or fractons is to require the conservation of dipole or higher multipole moments. We generalize this approach to allow for moments in phase space and classify all possible classical fracton models with phase-space multipole conservation laws. We focus on a new self-dual model that conserves both dipole and quadrupole moments in position and momentum; we analyze its dynamics and find quasi-periodic orbits in phase space that evade ergodic exploration of the full phase space.

    ↳ cond-mat.stat-mechcond-mat.str-elhep-phphysics.class-phPRL(2026)·4 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.