Journal of Cosmology and Astroparticle Physics最新文献

{"title":"Non-Gaussian statistics in galaxy weak lensing: compressed three-point correlations and cosmological forecasts","authors":"Sofia Samario-Nava, Alejandro Aviles and Juan Carlos Hidalgo","doi":"10.1088/1475-7516/2025/10/006","DOIUrl":"https://doi.org/10.1088/1475-7516/2025/10/006","url":null,"abstract":"Building on previous developments of a harmonic decomposition framework for computing the three-point correlation function (3PCF) of projected scalar fields over the sky, this work investigates how much cosmological information is contained in these higher-order statistics. We perform a forecast to determine the number of harmonic multipoles required to capture the full information content of the 3PCF in the context of galaxy weak lensing, finding that only the first few multipoles are sufficient to capture the additional cosmological information provided by the 3PCF. This study addresses a critical practical question: to what extent can the high-dimensional 3PCF signal be compressed without significant loss of cosmological information? Since the different multipoles contain highly redundant information, we apply a principal component analysis (PCA) which further reduces its dimensionality and preserving information. We also account for non-linear parameter degeneracies using the DALI method, an extension of Fisher forecasting that includes higher-order likelihood information. Under optimistic settings, we find that the 3PCF considerably improves the constraining power of the 2PCF for Ωm, reaching a 20% improvement. Other parameters also benefit, mainly due to their degeneracy with the matter abundance. For example, with our chosen scale cuts for galaxy sources at z = 0.5, we find that σ8 is more tightly constrained, whereas S8 and w0 are not. Finally, we construct analytical Gaussian covariance matrices that can serve as a first step toward developing semi-analytical, semi-empirical alternatives to sample covariances.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"24 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145203024","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Galaxy-cluster-stacked Fermi-LAT. Part II. Extended central hadronic signal","authors":"Uri Keshet","doi":"10.1088/1475-7516/2025/10/016","DOIUrl":"https://doi.org/10.1088/1475-7516/2025/10/016","url":null,"abstract":"Faint γ-ray signatures emerge in Fermi-LAT data stacked scaled to the characteristic θ500 angles of MCXC galaxy clusters. After Paper I of this series thus discovered virial shocks, later supported in other bands, this second paper focuses on cluster cores. Stacking 1–100 GeV source-masked data around clusters shows a significant (4.7σ for 75 clusters) and extended central excess, inconsistent with central point sources. The resolved signal is best fit (3.7σ TS-test) as hadronic emission from a cosmic-ray ion (CRI) distribution that is flat both spectrally (p ≡ 1 - dlnu/dlnE = 2.0 ± 0.3) and spatially (CRI-to-gas index σ = 0.1 ± 0.4), carrying an energy density du(0.1θ500)/dlnE = 10-13.6±0.5 erg cm-3 at E = 100 GeV energy; insufficient resolution would appear to raise p and σ. Such CRI match the long-predicted distribution needed to power diffuse intracluster radio emission in its various forms (mini-halos, giant halos, standard relics, their transitional forms, and mega-halos), disfavoring models that invoke electron (re)acceleration in weak shocks or turbulence. Stringent upper limits on residual γ-ray emission, e.g. from dark-matter annihilation, are imposed.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"37 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145203157","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Properties of general stationary axisymmetric spacetimes: circularity and beyond","authors":"Eugeny Babichev and Jacopo Mazza","doi":"10.1088/1475-7516/2025/10/011","DOIUrl":"https://doi.org/10.1088/1475-7516/2025/10/011","url":null,"abstract":"We analyse properties of general stationary and axisymmetric spacetimes, with a particular focus on circularity — an accidental symmetry enjoyed by the Kerr metric, and therefore widely assumed when searching for rotating black hole solutions in alternative theories of gravity as well as when constructing models of Kerr mimickers. Within a gauge specified by seven (or six) free functions, the local existence of which we prove, we solve the differential circularity conditions and translate them into algebraic relations among the metric components. This result opens the way to investigating the consequences of circularity breaking in a controlled manner. In particular, we construct two simple analytical examples of non-circular deformations of the Kerr spacetime. The first one is “minimal”, since the horizon and the static limit are identical to their Kerr counterparts, except for the fact that the horizon is not Killing and its surface gravity is therefore not constant. The second is “not so minimal”, as the horizon's profile can be chosen arbitrarily and the difference between the horizon and the so-called rotosurface can be appreciated. Our findings thus pave the way for further research into the phenomenology of non-circular stationary and axisymmetric spacetimes.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"73 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145203697","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Black hole photon ring beyond General Relativity: an integrable parametrization","authors":"Jibril Ben Achour, Éric Gourgoulhon and Hugo Roussille","doi":"10.1088/1475-7516/2025/10/012","DOIUrl":"https://doi.org/10.1088/1475-7516/2025/10/012","url":null,"abstract":"In recent years, the shape of the photon ring in black holes images has been argued to provide a sharp test of the Kerr hypothesis for future black hole imaging missions. In this work, we confront this proposal to beyond Kerr geometries and investigate the degeneracy in the estimations of the black hole parameters using the circlipse shape proposed by Gralla and Lupsasca. To that end, we consider a model-independent parametrization of the deviations to the Kerr black hole geometry, dubbed Kerr off shell (KOS), which preserves the fundamental symmetry structure of Kerr known as the Killing tower. Besides exhibiting a Killing tensor and thus a Carter-like constant, all the representants of this family also possess a Killing-Yano tensor and are of Petrov type D. The allowed deviations to Kerr, selected by the symmetry, are encoded in two free functions which depend respectively on the radial and polar angle coordinates. Using the symmetries, we provide an analytic study of the radial and polar motion of photon trajectories generating the critical curve, to which the subrings composing the photon ring converge. This allows us to derive a ready-to-use closed formula for the parametric critical curve in term of the free functions parametrizing the deviations to Kerr. Using this result, we confront the circlipse fitting function to four examples of Kerr-like objects and we show that it admits a high degree of degeneracy. At a given inclination, the same circlipse can fit both a Kerr black hole of a given mass and spin (M,a) or a modified rotating black hole with different mass and spin parameters (M,a) and a new parameter α. Therefore, future tests of the Kerr hypothesis could be achieved only provided one can measure independently the mass and spin of the black hole to break this degeneracy.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"72 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145203027","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Starobinsky like inflation and EGB Gravity in the light of ACT","authors":"Yogesh, Abolhassan Mohammadi, Qiang Wu and Tao Zhu","doi":"10.1088/1475-7516/2025/10/010","DOIUrl":"https://doi.org/10.1088/1475-7516/2025/10/010","url":null,"abstract":"The ACT data shows an enhancement in the value of the scalar spectral index, as ns = 0.9743 ± 0.0034, leading to disfavoring many inflationary models, including the Starobinsky model. To satisfy the constraint made by ACT, we will investigate the Starobinsky potential within the Einstein-Gauss-Bonnet(EGB) gravity theory. EGB gravity is motivated by the higher-dimensional theory, which includes quadratic curvature correction terms and a coupling between the scalar field and the GB term that modifies the dynamical equations. The model is considered by using the slow-roll approximation method and the exact numerical approach for two different coupling functions. The results indicate that the model is in good agreement with the data and the results stand in 1σ of the ACT r-ns plane. Considering the running of the scalar spectral index also implies the consistency of the model with data. In addition, the parametric space of the free parameters of the EGB coupling is explored, where we find the acceptable region of the parameters in which the resulting ns and r stay in 1σ of the ACT data. Next, the reheating phase is considered. It is determined that the model can simultaneously satisfy the constraint of ACT data and the reheating temperature constraints.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"115 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145203026","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The Simons Observatory: Quantifying the impact of beam chromaticity on large-scale B-mode science","authors":"Nadia Dachlythra, Kevin Wolz, Susanna Azzoni, David Alonso, Adriaan J. Duivenvoorden, Alexandre E. Adler, Jon E. Gudmundsson, Carlo Baccigalupi, Alessandro Carones, Gabriele Coppi, Samuel Day-Weiss, Josquin Errard, Nicholas Galitzki, Martina Gerbino, Remington G. Gerras, Carlos Hervias-Caimapo, Selim C. Hotinli, Federico Nati, Bruce Partridge, Yoshinori Sueno and Edward J. Wollack","doi":"10.1088/1475-7516/2025/10/005","DOIUrl":"https://doi.org/10.1088/1475-7516/2025/10/005","url":null,"abstract":"The Simons Observatory (SO) Small Aperture Telescopes (SATs) will observe the Cosmic Microwave Background (CMB) temperature and polarization at six frequency bands. Within these bands, the angular response of the telescope (beam) is convolved with the instrument's spectral response (commonly called bandpass) and the signal from the sky, which leads to the band-averaged telescope beam response, which is sampled and digitized. The spectral properties of the band-averaged beam depend on the natural variation of the beam within the band, referred to as beam chromaticity. In this paper, we quantify the impact of the interplay of beam chromaticity and intrinsic frequency scaling from the various components that dominate the polarized sky emission on the tensor-to-scalar ratio, r, and foreground parameters. We do so by employing a parametric power-spectrum-based foreground component separation algorithm, namely BBPower, to which we provide beam-convolved time domain simulations performed with the beamconv software while assuming an idealized version of the SO SAT optics. We find a small, 0.02σ, bias on r, due to beam chromaticity, which seems to mostly impact the dust spatial parameters, causing a maximum 0.77σ bias on the dust B-mode spectra amplitude, Ad, when employing Gaussian foreground simulations. However, we find all parameter biases to be smaller than 1σ at all times, independently of the foreground model. This includes the case where we introduce additional uncertainty on the bandpass shape, which accounts for approximately half of the total allowed gain uncertainty, as estimated in previous work for the SO SATs.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"9 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145203021","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"DESI DR1 Lyα 1D power spectrum: the optimal estimator measurement","authors":"Naim Göksel Karaçaylı, Paul Martini, J. Aguilar, S. Ahlen, E. Armengaud, S. Bailey, A. Bault, D. Bianchi, A. Brodzeller, D. Brooks, J. Chaves-Montero, T. Claybaugh, A. Cuceu, A. de la Macorra, A. Dey, B. Dey, P. Doel, S. Ferraro, A. Font-Ribera, J.E. Forero-Romero, E. Gaztañaga, S.Gontcho A. Gontcho, G. Gutierrez, J. Guy, C. Hahn, H.K. Herrera-Alcantar, K. Honscheid, M. Ishak, R. Kehoe, D. Kirkby, A. Kremin, M. Landriau, J.M. Le Goff, L. Le Guillou, M.E. Levi, M. Manera, A. Meisner, R. Miquel, P. Montero-Camacho, S. Nadathur, G. Niz, N. Palanque-Delabrouille, Z. Pan, W.J. Percival, Matthew M. Pieri, F. Prada, I. Pérez-Ràfols, C. Ravoux, G. Rossi, E. Sanchez, C. Saulder, D. Schlegel, M. Schubnell, H. Seo, M. Siudek, D. Sprayberry, T. Tan, Ji-Jia Tang, G. Tarlé, M. Walther, B.A. Weaver, J. Yu, R. Zhou and H. Zou","doi":"10.1088/1475-7516/2025/10/004","DOIUrl":"https://doi.org/10.1088/1475-7516/2025/10/004","url":null,"abstract":"The one-dimensional power spectrum P1D of Lyα forest offers rich insights into cosmological and astrophysical parameters, including constraints on the sum of neutrino masses, warm dark matter models, and the thermal state of the intergalactic medium. We present the measurement of P1D using the optimal quadratic maximum likelihood estimator applied to over 300,000 Lyα quasars from Data Release 1 (DR1) of the Dark Energy Spectroscopic Instrument (DESI) survey. This sample represents the largest to date for P1D measurements and is larger than the Extended Baryon Oscillation Spectroscopic Survey (eBOSS) by a factor of 1.7. We conduct a meticulous investigation of instrumental and analysis systematics and quantify their impact on P1D. This includes the development of a cross-exposure estimator that eliminates the need to model the pipeline noise and has strong potential for future P1D measurements. We also present new insights into metal contamination through the 1D correlation function. Using a fitting function we measure the evolution of the Lyα forest bias with high precision: bF(z) = (-0.218 ± 0.002) × ((1 + z)/4)2.96±0.06. In a companion validation paper, we substantially extend our previous suite of CCD image simulations to quantify the pipeline's exquisite performance accurately. In another companion paper, we present DR1 P1D measurements using the Fast Fourier Transform (FFT) approach to power spectrum estimation. These two measurements produce a forest bias parameter that differs by 2.2 sigma. However, our model is simplistic, so this disagreement will be investigated in future work.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"2 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145195445","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Constraints on the scale parameter of regular black hole in asymptotically safe gravity from extreme mass ratio inspirals","authors":"Lai Zhao, Meirong Tang and Zhaoyi Xu","doi":"10.1088/1475-7516/2025/10/002","DOIUrl":"https://doi.org/10.1088/1475-7516/2025/10/002","url":null,"abstract":"This paper evaluates the potential for constraining the quantum scale parameter ξ of regular black hole within the asymptotically safe gravity framework using gravitational waves from extreme mass ratio inspirals (EMRIs). Since ξ cannot be precisely determined from first principles, observational constraints become crucial. We employ the Augmented Analytical Kludge (AAK) method to calculate gravitational waveforms in the equatorial plane and systematically analyze the influence of different ξ values on phase evolution. Comparison with the Schwarzschild case demonstrates that the corrective effects of ξ accumulate in the phase over observation time, thereby providing distinguishable observational signatures. Through waveform mismatch analysis, our results indicate that the LISA detector can effectively detect the presence of ξ at the ∼ 10-4 level for systems with a mass of 106M⊙. Further assessment using the Fisher information matrix (FIM) confirms a measurement precision of Δξ ≈ 3.225 × 10-4, which significantly surpasses existing observational methods, providing quantitative observational evidence for asymptotically safe quantum gravity theory in the strong-field regime.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"99 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145195482","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The observation image of a soliton boson star illuminated by various accretions","authors":"Ke-Jian He, Guo-Ping Li, Chen-Yu Yang and Xiao-Xiong Zeng","doi":"10.1088/1475-7516/2025/10/003","DOIUrl":"https://doi.org/10.1088/1475-7516/2025/10/003","url":null,"abstract":"In this paper, we explore the observable signatures of solitonic boson stars by employing ray-tracing simulations, with celestial spheres and thin accretion disks serving as illumination sources. By numerically fitting the metric form, we solve the geodesic equation for photons under the influence of the soliton potential, enabling us to simulate the optical appearance of the soliton boson star in two distinct regimes. In the weak coupling case (larger value of coupling parameter α) with an initial scalar field ψ0, the images on the screen predominantly show direct and lensed images, where ψ0 and α modulate the image region size while the observation inclination θ controls morphological asymmetry. In the case of strong coupling (small value of α), the images on the screen show a nested sub-annulus within the Einstein ring in the celestial model, whereas thin disk accretion models reveal higher-order lensing images indicative that photons are capable of orbiting the equatorial plane of the boson star multiple times. We also analyze how the effective potential and redshift factor depend on the correlation parameter. At low inclination(θ < 30°), the redshift is the dominant effect, the image is characterized by a dim central cavity enclosed by a bright ring. At high inclination (θ > 60°), the Doppler effect becomes more pronounced, resulting in a substantial brightness disparity between the left and right sides of the optical image. These findings offer robust theoretical underpinnings for differentiating solitonic boson stars from black holes via high-resolution astronomical observations.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"21 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145195483","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Dark matter annihilation from pulsating dark stars","authors":"Chris Kouvaris and Dimitris Zavitsanos","doi":"10.1088/1475-7516/2025/10/001","DOIUrl":"https://doi.org/10.1088/1475-7516/2025/10/001","url":null,"abstract":"A strongly self-interacting component of asymmetric dark matter can collapse and form compact objects, provided there is an efficient mechanism of energy evacuation. If the dark matter quantum number is not completely conserved but it is slightly violated due to some new physics e.g. at the Planck scale, dark matter particles can annihilate into Standard Model particles. Even tiny annihilation cross sections are sufficient to produce observable luminosities. We demonstrate that these dark matter annihilations can trigger radial pulsations, causing a characteristic time modulation of the luminosities produced. We argue that in this scenario, the spectral features along with the properties of the oscillation can create a unique discovery signal for such objects in the sky.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"1 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145195481","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}