Journal of Cosmology and Astroparticle Physics最新文献_第6页

Refining the nonlinear modelling of primordial oscillatory features 改进原始振荡特征的非线性建模

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2025-05-21 DOI: 10.1088/1475-7516/2025/05/059

Mario Ballardini and Nicola Barbieri

{"title":"Refining the nonlinear modelling of primordial oscillatory features","authors":"Mario Ballardini and Nicola Barbieri","doi":"10.1088/1475-7516/2025/05/059","DOIUrl":"https://doi.org/10.1088/1475-7516/2025/05/059","url":null,"abstract":"Primordial oscillatory features in the power spectrum of curvature perturbations are sensitive probes of the dynamics of the early Universe and can provide insights beyond the standard inflationary scenario. While these features have been the focus of extensive studies using cosmic microwave background anisotropy data, large-scale structure surveys now provide competitive constraints with the opportunity to probe their effects at smaller scales with higher precision. In this paper, we present a complete description of the nonlinear model for primordial oscillatory features in the context of time-sliced perturbation theory extending the results already presented in the literature. We derive analytical expressions including novel contributions such as the mixed term between primordial oscillations and baryon acoustic oscillations, and we also calculate the corrections arising from the specific envelope of the oscillatory pattern, corresponding to a scale-dependent amplitude. These results are compared with N-body simulations using the COLA method and show consistent behaviour across different scales. Although the corrections are found to be small, they represent an important step to fully characterising the nonlinear imprints of primordial features on the matter power spectrum. Our results offer new calculations to be tested with future cosmological surveys that seek to detect these subtle signatures in the matter distribution.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"42 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144113986","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}

引用次数: 0

The Atacama Cosmology Telescope: Large-scale velocity reconstruction with the kinematic Sunyaev-Zel'dovich effect and DESI LRGs 阿塔卡马宇宙学望远镜：基于运动Sunyaev-Zel'dovich效应和DESI LRGs的大尺度速度重建

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2025-05-21 DOI: 10.1088/1475-7516/2025/05/057

Fiona McCarthy, Nicholas Battaglia, Rachel Bean, J. Richard Bond, Hongbo Cai, Erminia Calabrese, William R. Coulton, Mark J. Devlin, Jo Dunkley, Simone Ferraro, Vera Gluscevic, Yilun Guan, J. Colin Hill, Matthew C. Johnson, Aleksandra Kusiak, Alex Laguë, Niall MacCrann, Mathew S. Madhavacheril, Kavilan Moodley, Sigurd Naess, Frank J. Qu, Bernardita Ried Guachalla, Neelima Sehgal, Blake D. Sherwin, Cristóbal Sifón, Kendrick M. Smith, Suzanne T. Staggs, Alexander van Engelen, Eve M. Vavagiakis and Edward J. Wollack

{"title":"The Atacama Cosmology Telescope: Large-scale velocity reconstruction with the kinematic Sunyaev-Zel'dovich effect and DESI LRGs","authors":"Fiona McCarthy, Nicholas Battaglia, Rachel Bean, J. Richard Bond, Hongbo Cai, Erminia Calabrese, William R. Coulton, Mark J. Devlin, Jo Dunkley, Simone Ferraro, Vera Gluscevic, Yilun Guan, J. Colin Hill, Matthew C. Johnson, Aleksandra Kusiak, Alex Laguë, Niall MacCrann, Mathew S. Madhavacheril, Kavilan Moodley, Sigurd Naess, Frank J. Qu, Bernardita Ried Guachalla, Neelima Sehgal, Blake D. Sherwin, Cristóbal Sifón, Kendrick M. Smith, Suzanne T. Staggs, Alexander van Engelen, Eve M. Vavagiakis and Edward J. Wollack","doi":"10.1088/1475-7516/2025/05/057","DOIUrl":"https://doi.org/10.1088/1475-7516/2025/05/057","url":null,"abstract":"The kinematic Sunyaev-Zel'dovich (kSZ) effect induces a non-zero density-density-temperature bispectrum, which we can use to reconstruct the large-scale velocity field from a combination of cosmic microwave background (CMB) and galaxy density measurements, in a procedure known as “kSZ velocity reconstruction”. This method has been forecast to constrain large-scale modes with future galaxy and CMB surveys, improving their measurement beyond what is possible with the galaxy surveys alone. Such measurements will enable tighter constraints on large-scale signals such as primordial non-Gaussianity, deviations from homogeneity, and modified gravity. In this work, we demonstrate a statistically significant measurement of kSZ velocity reconstruction for the first time, by applying quadratic estimators to the combination of the ACT DR6 CMB+kSZ map and the DESI LRG galaxies (with photometric redshifts) in order to reconstruct the velocity field. We do so using a formalism appropriate for the 2-dimensional projected galaxy fields that we use, which naturally incorporates the curved-sky effects important on the largest scales. We find evidence for the signal by cross-correlating with an external estimate of the velocity field from the spectroscopic BOSS survey and rejecting the null (no-kSZ) hypothesis at 3.8σ. Our work presents a first step towards the use of this observable for cosmological analyses.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"8 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144114057","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}

引用次数: 0

Deep inference of simulated strong lenses in ground-based surveys 地面测量中模拟强透镜的深度推断

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2025-05-20 DOI: 10.1088/1475-7516/2025/05/053

Jason Poh, Ashwin Samudre, Aleksandra Ćiprijanović, Joshua Frieman, Gourav Khullar and Brian D. Nord

{"title":"Deep inference of simulated strong lenses in ground-based surveys","authors":"Jason Poh, Ashwin Samudre, Aleksandra Ćiprijanović, Joshua Frieman, Gourav Khullar and Brian D. Nord","doi":"10.1088/1475-7516/2025/05/053","DOIUrl":"https://doi.org/10.1088/1475-7516/2025/05/053","url":null,"abstract":"The large number of strong lenses discoverable in future astronomical surveys will likely enhance the value of strong gravitational lensing as a cosmic probe of dark energy and dark matter. However, leveraging the increased statistical power of such large samples will require further development of automated lens modeling techniques. We show that deep learning and simulation-based inference (SBI) methods produce informative and reliable estimates of parameter posteriors for strong lensing systems in ground-based surveys. We present the examination and comparison of two approaches to lens parameter estimation for strong galaxy-galaxy lenses — Neural Posterior Estimation (NPE) and Bayesian Neural Networks (BNNs). We perform inference on 1-, 5-, and 12-parameter lens models for ground-based imaging data that mimics the Dark Energy Survey (DES). We find that NPE outperforms BNNs, producing posterior distributions that are more accurate, precise, and well-calibrated for most parameters. For the 12-parameter NPE model, the calibration is consistently within <10% of optimal calibration for all parameters, while the BNN is rarely within 20% of optimal calibration for any of the parameters. Similarly, residuals for most of the parameters are smaller (by up to an order of magnitude) with the NPE model than the BNN model. This work takes important steps in the systematic comparison of methods for different levels of model complexity.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"95 1","pages":"053"},"PeriodicalIF":6.4,"publicationDate":"2025-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144114058","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}

引用次数: 0

νν̅ production, annihilation, and scattering at MeV temperatures and NLO accuracy νν γ γ的产生、湮灭和在MeV温度下的散射和NLO精度

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2025-05-20 DOI: 10.1088/1475-7516/2025/05/054

G. Jackson and M. Laine

引用次数: 0

Enhancing dark siren cosmology through multi-band gravitational wave synergetic observations 通过多波段引力波协同观测增强暗警笛宇宙学

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2025-05-19 DOI: 10.1088/1475-7516/2025/05/046

Yue-Yan Dong, Ji-Yu Song, Shang-Jie Jin, Jing-Fei Zhang and Xin Zhang

{"title":"Enhancing dark siren cosmology through multi-band gravitational wave synergetic observations","authors":"Yue-Yan Dong, Ji-Yu Song, Shang-Jie Jin, Jing-Fei Zhang and Xin Zhang","doi":"10.1088/1475-7516/2025/05/046","DOIUrl":"https://doi.org/10.1088/1475-7516/2025/05/046","url":null,"abstract":"Multi-band gravitational-wave (GW) standard siren observations are poised to herald a new era in the study of cosmic evolution. These observations offer higher signal-to-noise ratios and improved localizations compared to those achieved with single-band GW detection, which are crucial for the cosmological applications of dark sirens. In this work, we explore the role multi-band GW synergetic observations will play in measuring cosmological parameters, particularly in comparison with single GW observatory data. We used mock multi-band dark siren data from third-generation GW detectors and the baseline Decihertz Interferometer Gravitational-Wave Observatory to infer cosmological parameters. Our analysis shows that multi-band GW observations significantly improve sky localization accuracy by two to three orders of magnitude over single-band observations, although their impact on luminosity distance error remains limited. This results in a substantial improvement in the constraints on matter density and the Hubble constant, enhancing their constraint precision by 60%–90% and 52%–85%, respectively. We conclude that the significant potential of multi-band GW synergistic observations for detecting GW signals and resolving the Hubble tension is highly promising and warrants anticipation.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"33 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144104601","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}

引用次数: 0

Pixelization effects in cosmic shear angular power spectra 宇宙剪切角功率谱中的像素化效应

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2025-05-19 DOI: 10.1088/1475-7516/2025/05/048

Alex Hall and Nicolas Tessore

{"title":"Pixelization effects in cosmic shear angular power spectra","authors":"Alex Hall and Nicolas Tessore","doi":"10.1088/1475-7516/2025/05/048","DOIUrl":"https://doi.org/10.1088/1475-7516/2025/05/048","url":null,"abstract":"We conduct a comprehensive study into the impact of pixelization on cosmic shear, uncovering several sources of bias in standard pseudo-Cℓ estimators based on discrete catalogues. We derive models that can bring residual biases to the percent level on small scales. We elucidate the impact of aliasing and the varying shape of HEALPix pixels on power spectra and show how the HEALPix pixel window function approximation is made in the discrete spin-2 setting. We propose several improvements to the standard estimator and its modelling, based on the principle that source positions and weights are to be considered fixed. We show how empty pixels can be accounted for either by modifying the mixing matrices or applying correction factors that we derive. We introduce an approximate interlacing scheme for the HEALPix grid and show that it can mitigate the effects of aliasing. We introduce bespoke pixel window functions adapted to the survey footprint and show that, for band-limited spectra, biases from using an isotropic window function can be effectively reduced to zero. This work partly intends to serve as a useful reference for pixel-related effects in angular power spectra, which are of relevance for ongoing and forthcoming lensing and clustering surveys.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"55 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144104603","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}

引用次数: 0

Circularly polarized gravitational wave background search with a network of space-borne triangular detectors 圆极化引力波背景搜索与网络的空间运载三角形探测器

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2025-05-19 DOI: 10.1088/1475-7516/2025/05/050

Ju Chen, Chang Liu and Yun-Long Zhang

{"title":"Circularly polarized gravitational wave background search with a network of space-borne triangular detectors","authors":"Ju Chen, Chang Liu and Yun-Long Zhang","doi":"10.1088/1475-7516/2025/05/050","DOIUrl":"https://doi.org/10.1088/1475-7516/2025/05/050","url":null,"abstract":"Circularly polarized gravitational wave backgrounds are predicted in many well-motivated models of inflation and phase transitions involving spontaneous parity violation. In this work, we investigate the detection of such parity-violating signals with the network of two space-borne triangular detectors. We derive the general analytical formula for the overlap reduction functions of networks composed of two triangular detectors, by exploiting the system's symmetrical properties under the long-wave approximation. Based on these results, we further assess the detectability of a circularly polarized background with alternative LISA-Taiji network configurations. We find that the sensitivity to the parity-violating component can be significantly enhanced at low frequencies by adjusting the orientation of Taiji's constellation plane. This sensitivity gain is approximately an order of magnitude around the millihertz band, making the peak sensitivity comparable to that of the total intensity. This provides a promising opportunity to constrain various parity-violating theories in the millihertz band with upcoming space-borne detectors.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"23 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144104605","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}

引用次数: 0

Curvature perturbations from vacuum transition during inflation 膨胀期间真空跃迁引起的曲率扰动

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2025-05-19 DOI: 10.1088/1475-7516/2025/05/049

Björn Garbrecht, Pulkit S. Ghoderao and Arttu Rajantie

引用次数: 0

Spinning particle dynamics and the innermost stable circular orbit in covariant loop quantum gravity 协变环量子引力中自旋粒子动力学和最内层稳定圆轨道

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2025-05-19 DOI: 10.1088/1475-7516/2025/05/045

Yongbin Du, Yunlong Liu and Xiangdong Zhang

{"title":"Spinning particle dynamics and the innermost stable circular orbit in covariant loop quantum gravity","authors":"Yongbin Du, Yunlong Liu and Xiangdong Zhang","doi":"10.1088/1475-7516/2025/05/045","DOIUrl":"https://doi.org/10.1088/1475-7516/2025/05/045","url":null,"abstract":"In this paper, we investigate the motion of spinning particles in the background of covariant loop quantum gravity black holes, focusing on two distinct effective metric solutions. Both metrics incorporate a quantum parameter ζ, which quantifies the corrections from loop quantum gravity. When ζ approaches zero, the spacetime reduces to the classical Schwarzschild solution. Using the pole-dipole approximation, we derive the equations of motion for spinning particles, accounting for the spin-curvature coupling. Our analysis reveals significant deviations in the behavior of the Innermost Stable Circular Orbit (ISCO) due to quantum effects. In the first effective metric, as ζ increases, the ISCO's radial position shifts, and for sufficiently large values of ζ, the ISCO disappears, allowing particles to hover above the black hole. For non-spinning particles, the mass-to-energy conversion efficiency also decreases as ζ increases. In contrast, in the second metric, ISCOs persist even for large values of ζ, albeit with a more restrictive spin range. Moreover, only when the spin is nonzero do various ISCO parameters exhibit dependence on ζ. These findings highlight the impact of loop quantum gravity corrections on the dynamics of spinning particles.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"38 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144104600","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}

引用次数: 0

Does Gauss-Bonnet inflationary gravitational waves satisfy the pulsar timing arrays observations? 高斯-邦尼膨胀引力波是否满足脉冲星定时阵列的观测？

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2025-05-19 DOI: 10.1088/1475-7516/2025/05/047

Lu Yin

{"title":"Does Gauss-Bonnet inflationary gravitational waves satisfy the pulsar timing arrays observations?","authors":"Lu Yin","doi":"10.1088/1475-7516/2025/05/047","DOIUrl":"https://doi.org/10.1088/1475-7516/2025/05/047","url":null,"abstract":"The observations from pulsar timing arrays (PTAs), led by the North American Nanohertz Observatory for Gravitational Waves (NANOGrav), have provided opportunities to constrain primordial gravitational waves at low frequencies. In this paper, we analyze the best-fit parameter values for different Gauss-Bonnet Inflationary Gravitational Wave (GB-IGW) models with the PTArcade program, and we compare the results with the observations of NANOGrav, European Pulsar Timing Array (EPTA), Parkes Pulsar Timing Array (PPTA), and International Pulsar Timing Array (IPTA). We find the potential parameter n derived from the GB-IGW model is not necessarily positive. Instead, PTA data suggest the possibility of new parameter ranges. Meanwhile, the other parameters' results, such as the spectral indices of the scalar and tensor perturbation also have differences with traditional Cosmic Microwave Background analyses from Planck 2018, showing the reason for the different phenomena of Gravitational Wave power spectra expected. Additionally, the GB-IGW models we calculated are closer to the central values of multiple PTA datasets compared to the standard inflation model, making the GB-IGW model more likely to be detected by future space-based gravitational wave observatories.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"32 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144104602","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}

引用次数: 0