Fri·Sep 10, 2021Friday·September 10, 2021

1. 01*

   Sensitivity of accelerator-based neutrino experiments to neutrino-dark matter interaction: Elko as a viable dark matter candidate

   C. A. Moura🇧🇷 · F. Kamiya🇧🇷 · L. Duarte🇧🇷 · M. Dias🇧🇷 · J. M. Hoff da Silva🇧🇷

   We analyze the potential of accelerator-based neutrino experiments, such as the Deep Underground Neutrino Experiment, to constrain a five dimensional operator mediating a beyond standard model interaction between mass dimension one fermion fields, labeled elko, and neutrino. We identify the parameter space where elko is a viable dark matter candidate.

   hep-phEPL(2022)·6 citations
2. 02*

   Quark condensate from confinement in QCD

   R. A. Abramchuk🇷🇺 · Yu. A. Simonov🇷🇺

   The scalar confinement in QCD is shown to produce the nonzero quark condensate for any current quark mass. Mechanisms for the Chiral Symmetry breaking and for the nonzero quark condensates are revealed. For the light and strange flavors the condensates are essentially chiral (proportional to (string tension)${}^{3/2}$). The expressions for the quark condensates are obtained as a sum over non-chiral meson states, and, using the operator product expansion, as an explicit expression that involves the confining string tension and the current quark mass. The numerical results are fairly close to the lattice data.

   hep-ph4 citations
3. 03*

   A short theoretical review of charmonium production

   An-Ping Chen🇨🇳 · Yan-Qing Ma🇨🇳 · Hong Zhang🇨🇳

   In this paper, we review the current status of the phenomenological study of quarkonium production in high energy collisions. After a brief introduction of several important models and effective field theories for quarkonium production, we discuss the comparisons between theoretical predictions and experimental measurements.

   hep-phAdv.High Energy Phys.(2022)·22 citations
4. 04*

   Leptogenesis and fermion mass fit in a renormalizable $SO(10)$ model

   V. Suryanarayana Mummidi🇮🇳 · Ketan M. Patel🇮🇳

   A non-supersymmetric renormalizable $SO(10)$ model is investigated for its viability in explaining the observed fermion masses and mixing parameters along with the baryon asymmetry produced via thermal leptogenesis. The Yukawa sector of the model consists of complex $10_H$ and ${\overline{126}}_H$ scalars with a Peccei-Quinn like symmetry and it leads to strong correlations among the Yukawa couplings of all the standard model fermions including the couplings and masses of the right-handed (RH) neutrinos. The latter implies the necessity to include the second lightest RH neutrino and flavor effects for the precision computation of leptogenesis. We use the most general density matrix equations to calculate the temperature evolution of flavoured leptonic asymmetry. A simplified analytical solution of these equations, applicable to the RH neutrino spectrum predicted in the model, is also obtained which allows one to fit the observed baryon to photon ratio along with the other fermion mass observables in a numerically efficient way. The analytical and numerical solutions are found to be in agreement within a factor of $\mathcal{O}(1)$. We find that the successful leptogenesis in this model does not prefer any particular value for leptonic Dirac and Majorana CP phases and the entire range of values of these observables is found to be consistent. The model specifically predicts (a) the lightest neutrino mass $m_{{\nu }_1}$ between 2-8 meV, (b) the effective mass of neutrinoless double beta decay $m_{\beta \beta }$ between 4-10 meV, and (c) a particular correlation between the Dirac and one of the Majorana CP phases.

   hep-phJHEP(2021)·44 citations
5. 05*

   Poynting vector controversy in axion modified electrodynamics

   Michael E Tobar🇦🇺 · Ben T McAllister🇦🇺 · Maxim Goryachev🇦🇺

   The most sensitive haloscopes that search for axion dark matter through the two photon electromagnetic anomaly, convert axions into photons through the mixing of axions with a large DC magnetic field. In this work we apply Poynting theorem to the resulting axion modified electrodynamics and identify two possible Poynting vectors, one similar to the Abraham Poynting vector and the other to the Minkowski Poynting vector in electrodynamics. The latter picks up the extra non-conservative terms while the former does not. To understand the source of energy conversion and power flow in the detection systems, we apply the two Poynting theorems to axion modified electrodynamics, for both the resonant cavity and broadband low-mass axion detectors. We show that both Poynting theorems give the same sensitivity for a resonant cavity axion haloscope, but predict markedly different sensitivity for a low-mass broadband capacitive haloscope. Hence we ask the question, can understanding which one is the correct one for axion dark matter detection, be considered under the framework of the Abraham-Minkowski controversy? In reality, this should be confirmed by experiment when the axion is detected. However, many electrodynamic experiments have ruled in favour of the Minkowski Poynting vector when considering the canonical momentum in dielectric media. In light of this, we show that the axion modified Minkowski Poynting vector should indeed be taken seriously for sensitivity calculation for low-mass axion haloscope detectors in the quasi static limit, and predict orders of magnitude better sensitivity than the Abraham Poynting vector equivalent.

   hep-phastro-ph.IMgr-qchep-exPRD(2022)·23 citations
6. 06*

   Linear seesaw model with a modular $S_4$ flavor symmetry

   Takaaki Nomura🇨🇳 · Hiroshi Okada🇰🇷

   We discuss a linear seesaw model with as minimum field content as possible, introducing a modular $S_4$ with the help of gauged $U(1{)}_{B-L}$ symmetries. Due to rank two neutrino mass matrix, we have a vanishing neutrino mass eigenvalue, and only the normal mass hierarchy of neutrinos is favored through the modular $S_4$ symmetry. In our numerical $\Delta {\chi }^2$ analysis, we especially find rather sharp prediction on sum of neutrino masses to be around $60$ meV in addition to the other predictions.

   hep-phCPC(2022)·19 citations
7. 07*

   Baryon magnetic moment in large-$N_c$ chiral perturbation theory: Complete analysis for $N_c=3$

   Ruben Flores-Mendieta🇲🇽 · Carlos Isaac Garcia🇲🇽 · Johann Hernandez🇲🇽 · Maria Anabel Trejo🇲🇽

   Baryon magnetic moments are computed in baryon chiral perturbation theory in the large-$N_c$ limit at one-loop order, where $N_c$ is the number of color charges. Orders $\mathcal{O}(m_q^{1/2})$ and $\mathcal{O}(m_q\ln m_q)$ corrections are both evaluated including all the operator structures that participate at the physical value $N_c=3$. The complete expressions for octet and decuplet baryon magnetic moments in addition to decuplet-octet baryon transition moments are thus compared to their available counterparts obtained in heavy baryon chiral perturbation theory for degenerate intermediate baryons in the loops. Theoretical expressions fully agree at the physical values $N_c=3$ and $N_f=3$ flavors of light quarks. Some numerical evaluations are produced via a least-squares fit to explore the free parameters in the analysis. Results point out the necessity of incorporating the effects of non-degenerate intermediate baryons in the loops for a consistent determination of these free parameters.

   hep-phPRD(2021)·6 citations
8. 08*

   Microlensing constraints on axion stars including finite lens and source size effects

   Kohei Fujikura🇯🇵 · Mark P. Hertzberg🇺🇸 · Enrico D. Schiappacasse🇫🇮 · Masahide Yamaguchi🇯🇵

   A fraction of light scalar dark matter, especially axions, may organize into Bose-Einstein condensates, gravitationally bound clumps, "boson stars", and be present in large number in galactic halos today. We compute the expected number of gravitational microlensing events of clumps composed of the ordinary QCD axion and axion-like-particles and derive microlensing constraints from the EROS-2 survey and the Subaru Hyper Suprime-Cam observation. We perform a detailed lensing calculation, including the finite lens and source size effects in our analysis. We constrain the axion mass in terms of the fraction of dark matter collapsed into clumps, the individual clump densities, and the axion self-coupling. We also consider and constrain clumps composed of a generic scalar dark matter candidate with repulsive self-interactions. Our analysis opens up a new window for the potential discovery of dark matter.

   hep-phastro-ph.COPRD(2021)·31 citations
9. 09*

   Hidden-charm tetraquarks with strangeness in the chiral quark model

   Gang Yang🇨🇳 · Jialun Ping🇨🇳 · Jorge Segovia🇪🇸

   The hidden-charm tetraquarks with strangeness, $c\bar{c}s\bar{q}$ $(q=u,d)$, in $J^P=0^{+}$, $1^{+}$ and $2^{+}$ are systematically investigated in the framework of real- and complex-scaling range of a chiral quark model, whose parameters have been fixed in advance describing hadron, hadron-hadron and multiquark phenomenology. Each tetraquark configuration, compatible with the quantum numbers studied, is taken into account; this includes meson-meson, diquark-antidiquark and K-type arrangements of quarks with all possible color wave functions in four-body sector. Among the different numerical techniques to solve the Schrödinger-like 4-body bound state equation, we use a variational method in which the trial wave function is expanded in complex-range Gaussian basis functions, which is characterized by its simplicity and flexibility. This theoretical framework has already been used to study different kinds of multiquark systems, such as the hidden-charm pentaquarks, $P_c^{+}$, and doubly-charmed tetraquarks, $T_{cc}^{+}$. The recently reported $Z_{cs}$ states by the BESIII and LHCb collaborations are generally compatible with either compact tetraquark or hadronic molecular resonance configurations in our investigation. Moreover, several additional exotic resonances are found in the mass range between 3.8 GeV and 4.6 GeV.

   hep-phhep-exhep-latnucl-ex+1PRD(2021)·36 citations
10. 10*

    Higgs decay into a lepton pair and a photon: a roadmap to $\mathbf{H}\to \mathbf{Z}\gamma$ discovery and probes of new physics

    Aliaksei Kachanovich🇩🇪 · Ulrich Nierste🇩🇪 · Ivan Nišandžić🇭🇷

    The decay $H\to {\ell }^{+}{\ell }^{-}\gamma$, $\ell =e,\mu$, receives contributions from $H\to Z[\to {\ell }^{+}{\ell }^{-}]\gamma$ and a non-resonant contribution, both of which are loop-induced. We describe how one can separate these sub-processes in a gauge-independent way, define the decay rate $\Gamma (H\to Z\gamma )$, and extract the latter from differential $H\to {\ell }^{+}{\ell }^{-}\gamma$ branching ratios. For $\ell =\mu$ also the tree decay rate, which is driven by the muon Yukawa coupling, is important. We propose kinematic cuts optimized to separate the three contributions, paving the way to the milestones (i) discovery of $H\to Z\gamma$, (ii) discovery of $H\to {\mu }^{+}{\mu }^{-}{\gamma |}_{\mathrm{tree}}$, and (iii) quantification of new physics in both the effective $H$-$Z$-$\gamma$ and non-resonant $H$-${\ell }^{+}$-${\ell }^{-}$-$\gamma$ couplings.

    hep-phPRD(2022)·19 citations
11. 11*

    Driving chiral phase transition with ring diagram

    Pok Man Lo🇵🇱 · Michał Szymański🇵🇱 · Krzysztof Redlich🇵🇱 · Chihiro Sasaki🇵🇱

    We study the dressing of four-quark interaction by the ring diagram, and its feeding back to the quark gap equation, in an effective chiral quark model. Implementing such an in-medium coupling naturally reduces the chiral transition temperature in a class of chiral models, and is capable of generating the inverse magnetic catalysis at finite temperatures. We also demonstrate the important role of confining forces, via the Polyakov loop, in a positive feedback mechanism which reinforces the inverse magnetic catalysis.

    hep-phhep-thnucl-thEPJA(2022)·8 citations
12. 12*

    Directional Detection of Light Dark Matter in Superconductors

    Yonit Hochberg🇮🇱 · Eric David Kramer🇮🇱 · Noah Kurinsky🇺🇸 · Benjamin V. Lehmann🇺🇸

    Superconducting detectors have been proposed as outstanding targets for the direct detection of light dark matter scattering at masses as low as a keV. We study the prospects for directional detection of dark matter in isotropic superconducting targets from the angular distribution of excitations produced in the material. We find that dark matter scattering produces initial excitations with an anisotropic distribution, and further show that this directional information can be preserved as the initial excitations relax. Our results demonstrate that directional detection is possible for a wide range of dark matter masses, and pave the way for light dark matter discovery with bulk superconducting targets.

    hep-phastro-ph.COcond-mat.mtrl-scicond-mat.supr-con+1PRD(2023)·51 citations
13. 13*

    Thermal Misalignment of Scalar Dark Matter

    Brian Batell🇺🇸 · Akshay Ghalsasi🇺🇸

    The conventional misalignment mechanism for scalar dark matter depends on the initial field value, which governs the oscillation amplitude and present-day abundance. We present a mechanism by which a feeble (Planck-suppressed) coupling of dark matter to a fermion in thermal equilibrium drives the scalar towards its high-temperature potential minimum at large field values, dynamically generating misalignment before oscillations begin. Unlike conventional misalignment production, the dark matter abundance is dictated by microphysics and not by initial conditions. As an application of the generic mechanism, we discuss a realistic scenario in which dark matter couples to the muon.

    hep-phastro-ph.COPRD(2023)·51 citations
14. 14*

    Cosmic Evolution of Lepton Flavor Charges

    Chee Sheng Fong🇧🇷

    In the early Universe above the weak scale, both baryon $B$ and lepton $L$ numbers are violated by nonperturabive effects in the Standard Model while $B-L$ remains conserved. Introducing new physics which violates perturbatively $L$ and/or $B$, one can generate dynamically a nonzero $B-L$ charge and hence a nonzero $B$ charge. In this work, we focus on the former scenario which is also known as leptogenesis. We show how to describe the evolutions of lepton flavor charges taking into account the complete Standard Model lepton flavor and spectator effects in a unified and lepton flavor basis-independent way. The recipe we develop can be applied to any leptogenesis model with arbitrary number of new scalars carrying nonzero hypercharges and is valid for cosmic temperature ranging from $10^{15}$ GeV down to the weak scale. We demonstrate that in order to describe the physics in a basis-independent manner and to include lepton flavor effect consistently it is necessary to describe both left-handed and right-handed lepton charges in terms of density matrices. This is a crucial point since physics should be basis independent. As examples, we apply the formalism to type-I and type-II leptogenesis models where in the latter case, a flavor-covariant formalism is indispensable.

    hep-phPRD(2022)·7 citations
15. 15*

    Leptonic Scalars and Collider Signatures in a UV-complete Model

    P. S. Bhupal Dev🇺🇸 · Bhaskar Dutta🇺🇸 · Tathagata Ghosh🇮🇳 · Tao Han🇺🇸 · Han Qin🇺🇸 · Yongchao Zhang🇨🇳

    We study the non-standard interactions of neutrinos with light leptonic scalars ($\varphi$) in a global $(B-L)$-conserved ultraviolet (UV)-complete model. The model utilizes Type-II seesaw motivated neutrino interactions with an $SU(2{)}_L$-triplet scalar, along with an additional singlet in the scalar sector. This UV-completion leads to an enriched spectrum and consequently new observable signatures. We examine the low-energy lepton flavor violation constraints, as well as the perturbativity and unitarity constraints on the model parameters. Then we lay out a search strategy for the unique signature of the model resulting from the leptonic scalars at the hadron colliders via the processes $H^{\pm \pm }\to W^{\pm }{W}^{\pm }\varphi$ and $H^{\pm }\to W^{\pm }\varphi$ for both small and large leptonic Yukawa coupling cases. We find that via these associated production processes at the HL-LHC, the prospects of doubly-charged scalar $H^{\pm \pm }$ can reach up to 800 (500) GeV and 1.1 (0.8) TeV at the $2\sigma (5\sigma )$ significance for small and large Yukawa couplings, respectively. A future 100 TeV hadron collider will further increase the mass reaches up to 3.8 (2.6) TeV and 4 (2.7) TeV, at the $2\sigma (5\sigma )$ significance, respectively. We also demonstrate that the mass of $\varphi$ can be determined at about 10% accuracy at the LHC for the large Yukawa coupling case even though it escapes as missing energy from the detectors.

    hep-phJHEP(2022)·22 citations
16. 16*

    Vacuum replicas in field-theory models of Coulomb QCD

    Pedro J. de A. Bicudo🇵🇹 · Eduardo Garnacho Velasco🇪🇸 · Felipe J. Llanes-Estrada🇪🇸 · J. Emilio Ribeiro🇵🇹 · Víctor Serrano Herreros🇪🇸 · Jorge Vallejo Fernández🇪🇸

    Dynamical symmetry breaking can happen through a Higgs mechanism but also spontaneously within a strongly-enough coupled theory. We treat a field-theoretical quark model of QCD based on a linear+Coulomb Cornell potential (to account for the longitudinal interaction), together with a transverse interaction (to account for Coulomb-gauge gluons) in BCS approximation. After extracting the well-known BCS ground state on which abundant hadron phenomenology implementing dynamical chiral symmetry breaking has been built, we find two excited replica vacuumlike states shown in figure 1. At the BCS level they are classically unstable, but second quantization blocks transitions between them in volumes much larger than a hadron size. Mesons built over the replica vacua have relative masses similar to normal mesons on the ordinary vacuum; we find no negative-mass mode, confirming their stability found earlier with a harmonic oscillator potential.

    hep-phhep-thPoS(2022)·2 citations
17. 17*

    Constraints on the spatially dependent cosmic-ray propagation model from Bayesian Analysis

    Meng-Jie Zhao🇨🇳 · Kun Fang🇨🇳 · Xiao-Jun Bi🇨🇳

    The energy spectra of primary and secondary cosmic rays (CR) generally harden at several hundreds of GeV, which can be naturally interpreted by propagation effects. We adopt a spatially dependent CR propagation model to fit the spectral hardening, where a slow-diffusion disk (SDD) is assumed near the Galactic plane. We aim to constrain the propagation parameters with the Bayesian parameter estimation based on a Markov chain Monte Carlo sampling algorithm. The latest precise measurements of carbon spectrum and B/C ratio are adopted in the Bayesian analysis. The ${}^{10}\mathrm{Be}{/}^9\mathrm{Be}$ and Be/B ratios are also included to break parameter degeneracies. The fitting result shows that all the parameters are well constrained. Especially, the thickness of the SDD is limited to 0.4-0.5 kpc above and below the Galactic plane, which could be the best constraint for the slow-diffusion region among similar works. The $\bar{p}/p$ ratio and amplitude of CR anisotropy predicted by the SDD model are consistent with the observations, while the predicted high-energy electron and positron fluxes are slightly and significantly lower than the observations, respectively, indicating the necessity of extra sources.

    ↳ astro-ph.HEhep-phPRD(2021)·26 citations
18. 18*

    Gravitational memory effects in Chern-Simons modified gravity

    Shaoqi Hou🇨🇳 · Tao Zhu🇨🇳 · Zong-Hong Zhu🇨🇳

    The gravitational memory effects of Chern-Simons modified gravity are considered in the asymptotically flat spacetime. If the Chern-Simons scalar does not directly couple with the ordinary matter fields, there are also displacement, spin and center-of-mass memory effects as in general relativity. This is because the term of the action that violates the parity invariance is linear in the scalar field but quadratic in the curvature tensor. This results in the parity violation occuring at the higher orders in the inverse luminosity radius. The scalar field does not induce any new memory effects that can be detected by interferometers or pulsar timing arrays. The asymptotic symmetry is group is also the extended Bondi-Metzner-Sachs group. The constraints on the memory effects excited by the tensor modes are obtained.

    ↳ gr-qchep-phhep-thPRD(2022)·36 citations
19. 19*

    Light dark bosons in the JUNO-TAO neutrino detector

    Mikhail Smirnov🇨🇳 · Guang Yang🇺🇸 · Jiajun Liao🇨🇳 · Zhuojun Hu🇨🇳 · Jiajie Ling🇨🇳

    This work presents a sensitivity study of a reactor liquid scintillator detector to three kinds of dark bosons with masses below 1 MeV, such as dark photons, axion-like particles and light scalar bosons. The JUNO-TAO detector with Taishan nuclear reactor is taken as a reference. With proposed 180 days data taking, the sensitivity to the dark bosons can reach $\sim 10^{-5}$ 95%C.L. for the optimized signal to background ratio for the electron coupling constant $g_X$ through inverse Compton-like scattering. Similar calculations are completed for axion-like particles and scalar bosons. The background systematic uncertainty presents as the main limiting factor for the further sensitivity improvement. Several remarks are made to the controversial analysis for the NEOS experiment. Additionally the differential and the inverse differential cross sections have been derived for all three boson types and their interactions with electrons in liquid scintillator.

    ↳ hep-exhep-phphysics.ins-detPRD(2021)·10 citations
20. 20*

    Phase diagram of the 2+1-dimensional Gross-Neveu model with chiral imbalance

    Marc Winstel🇩🇪 · Laurin Pannullo🇩🇪 · Marc Wagner🇩🇪

    In this work, the phase diagram of the $2+1$-dimensional Gross-Neveu model is investigated with baryon chemical potential as well as chiral chemical potential in the mean-field approximation. We study the theory using two lattice discretizations, which are both based on naive fermions. An inhomogeneous chiral phase is observed only for one of the two discretizations. Our results suggest that this phase disappears in the continuum limit.

    ↳ hep-lathep-phPoS(2022)·11 citations
21. 21*

    Hubble tension or a transition of the Cepheid SnIa calibrator parameters?

    Leandros Perivolaropoulos🇬🇷 · Foteini Skara🇬🇷

    We re-analyze the Cepheid data used to infer the value of $H_0$ by calibrating SnIa. We do not enforce a universal value of the empirical Cepheid calibration parameters $R_W$ (Cepheid Wesenheit color-luminosity parameter) and $M_H^W$ (Cepheid Wesenheit H-band absolute magnitude). Instead, we allow for variation of either of these parameters for each individual galaxy. We also consider the case where these parameters have two universal values: one for low galactic distances $D<D_c$ and one for high galactic distances $D>D_c$ where $D_c$ is a critical transition distance. We find hints for a $3\sigma$ level mismatch between the low and high galactic distance parameter values. We then use AIC and BIC criteria to compare and rank the following types of models: Base models: Universal values for $R_W$ and $M_H^W$ (no parameter variation), I Individual fitted galactic $R_W$ with a universal fitted $M_H^W$, II Universal fixed $R_W$ with individual fitted galactic $M_H^W$, III Universal fitted $R_W$ with individual fitted galactic $M_H^W$, IV Two universal fitted $R_W$ (near and far) with one universal fitted $M_H^W$, V Universal fitted $R_W$ with two universal fitted $M_H^W$ (near and far), VI Two universal fitted $R_W$ with two universal fitted $M_H^W$ (near and far). We find that the AIC and BIC criteria consistently favor model IV instead of the commonly used Base model where no variation is allowed for the Cepheid empirical parameters. The best fit value of the SnIa absolute magnitude $M_B$ and of $H_0$ implied by the favored model IV is consistent with the inverse distance ladder calibration based on the CMB sound horizon $H_0=67.4\pm 0.5km{s}^{-1}Mp{c}^{-1}$. Thus in the context of the favored model IV the Hubble crisis is not present. This model may imply the presence of a fundamental physics transition taking place at a time more recent than $100Myrs$ ago.

    ↳ astro-ph.COgr-qchep-phhep-thPRD(2021)·94 citations
22. 22*

    The Atacama Cosmology Telescope: Constraints on Pre-Recombination Early Dark Energy

    J. Colin Hill🇺🇸 · Erminia Calabrese🇬🇧 · Simone Aiola🇺🇸 · Nicholas Battaglia🇺🇸 · Boris Bolliet🇺🇸 · Steve K. Choi🇺🇸 · Mark J. Devlin🇺🇸 · Adriaan J. Duivenvoorden🇺🇸 · Jo Dunkley🇺🇸 · Simone Ferraro🇺🇸 · Patricio A. Gallardo🇺🇸 · Vera Gluscevic🇺🇸 and 31 other authors

    The early dark energy (EDE) scenario aims to increase the value of the Hubble constant ($H_0$) inferred from cosmic microwave background (CMB) data over that found in $\Lambda$CDM, via the introduction of a new form of energy density in the early universe. The EDE component briefly accelerates cosmic expansion just prior to recombination, which reduces the physical size of the sound horizon imprinted in the CMB. Previous work has found that non-zero EDE is not preferred by Planck CMB power spectrum data alone, which yield a 95% confidence level (CL) upper limit $f_{\mathrm{EDE}}<0.087$ on the maximal fractional contribution of the EDE field to the cosmic energy budget. In this paper, we fit the EDE model to CMB data from the Atacama Cosmology Telescope (ACT) Data Release 4. We find that a combination of ACT, large-scale Planck TT (similar to WMAP), Planck CMB lensing, and BAO data prefers the existence of EDE at $>99.7$% CL: $f_{\mathrm{EDE}}=0.091_{-0.036}^{+0.020}$, with $H_0=70.9_{-2.0}^{+1.0}$ km/s/Mpc (both 68% CL). From a model-selection standpoint, we find that EDE is favored over $\Lambda$CDM by these data at roughly $3\sigma$ significance. In contrast, a joint analysis of the full Planck and ACT data yields no evidence for EDE, as previously found for Planck alone. We show that the preference for EDE in ACT alone is driven by its TE and EE power spectrum data. The tight constraint on EDE from Planck alone is driven by its high-$\ell$ TT power spectrum data. Understanding whether these differing constraints are physical in nature, due to systematics, or simply a rare statistical fluctuation is of high priority. The best-fit EDE models to ACT and Planck exhibit coherent differences across a wide range of multipoles in TE and EE, indicating that a powerful test of this scenario is anticipated with near-future data from ACT and other ground-based experiments.

    ↳ astro-ph.COgr-qchep-phPRD(2022)·162 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.