Journal of Cosmology and Astroparticle Physics最新文献_第8页

Relativistic and wide-angle corrections to galaxy power spectra 星系功率谱的相对论修正和广角修正

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2024-08-22 DOI: 10.1088/1475-7516/2024/08/027

Sheean Jolicoeur, Sêcloka L. Guedezounme, Roy Maartens, Pritha Paul, Chris Clarkson and Stefano Camera

引用次数: 0

Optimal constraints on Primordial non-Gaussianity with the eBOSS DR16 quasars in Fourier space 利用傅立叶空间中的 eBOSS DR16 类星体对原始非高斯性的最佳约束

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2024-08-22 DOI: 10.1088/1475-7516/2024/08/036

Marina S. Cagliari, Emanuele Castorina, Marco Bonici and Davide Bianchi

{"title":"Optimal constraints on Primordial non-Gaussianity with the eBOSS DR16 quasars in Fourier space","authors":"Marina S. Cagliari, Emanuele Castorina, Marco Bonici and Davide Bianchi","doi":"10.1088/1475-7516/2024/08/036","DOIUrl":"https://doi.org/10.1088/1475-7516/2024/08/036","url":null,"abstract":"We present constraints on the amplitude of local Primordial Non-Gaussianities (PNG), fNL, using the quasar sample in the Sloan Digital Sky Survey IV extended Baryon Oscillation Spectroscopic Survey (eBOSS) Data Release 16 (DR16). We analyze the power spectrum monopole, testing for the presence of scale-dependent galaxy bias induced by local PNG. Our analysis makes use of optimal redshift weights that maximize the response of the quasar sample to the possible presence of non-zero PNG. We find -4 < fNL < 27 at 68% confidence level, which is among the strongest bounds with Large Scale Structure data. The optimal analysis reduces the error bar by ~10% compared to the standard one, but this improvement is lower than the one expected from previous forecasts. In addition, the larger volume of this dataset, when compared to previous releases of the eBOSS quasar catalog, does not always correspond to a reduction of the final uncertainty on local PNG. This could suggest the presence of still unknown systematic effects in the data. If the quasars have a lower response to local PNG, our optimal constraint becomes -23 < fNL < 21 at 68%, with an improvement of 30% over standard analyses. We also show how to use the optimal weights to put data-driven priors on the sample's response to local PNG.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":null,"pages":null},"PeriodicalIF":6.4,"publicationDate":"2024-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142045413","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

Gravitational waves from primordial black hole evaporation with large extra dimensions 来自具有大额外维度的原始黑洞蒸发的引力波

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2024-08-22 DOI: 10.1088/1475-7516/2024/08/033

Aurora Ireland, Stefano Profumo and Jordan Scharnhorst

{"title":"Gravitational waves from primordial black hole evaporation with large extra dimensions","authors":"Aurora Ireland, Stefano Profumo and Jordan Scharnhorst","doi":"10.1088/1475-7516/2024/08/033","DOIUrl":"https://doi.org/10.1088/1475-7516/2024/08/033","url":null,"abstract":"The spectra of gravitational waves from black hole evaporation generically peak at frequencies of order the Hawking temperature, making this signal ultra-high frequency for primordial black holes evaporating in the early universe. This motivates us to consider small black holes in theories with large extra dimensions, for which the peak frequency can be lowered substantially, since the true bulk Planck scale M* can be much smaller than the effective MPl. We study the emission of brane-localized gravitons during the Hawking evaporation of ultra-light primordial black holes in the context of theories with large extra dimensions, with the ultimate goal of computing the contribution to the stochastic gravitational wave background. To accurately model black hole evolution, we compute greybody factors for particles of spin-0, 1/2, 1, and 2 emitted on the brane and in the bulk, presuming the majority of emission proceeds during the Schwarzschild phase. We then compute the power spectrum and present day spectral density parameter for brane-localized gravitons contributing to a gravitational wave signal. We find that for an optimal choice of parameters, the peak frequency plateaus in the sub-MHz regime, within range of planned high-frequency gravitational wave detectors, making this scenario a target for detection once their sensitivity exceeds ΔNeff bounds.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":null,"pages":null},"PeriodicalIF":6.4,"publicationDate":"2024-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142045471","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

Impact of astrophysical scatter on the epoch of reionization [H i]21 bispectrum 天体物理散射对再电离时代[H i]21双谱的影响

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2024-08-22 DOI: 10.1088/1475-7516/2024/08/032

Chandra Shekhar Murmu, Kanan K. Datta, Suman Majumdar and Thomas R. Greve

{"title":"Impact of astrophysical scatter on the epoch of reionization [H i]21 bispectrum","authors":"Chandra Shekhar Murmu, Kanan K. Datta, Suman Majumdar and Thomas R. Greve","doi":"10.1088/1475-7516/2024/08/032","DOIUrl":"https://doi.org/10.1088/1475-7516/2024/08/032","url":null,"abstract":"It is believed that the first star-forming galaxies are the main drivers of cosmic reionization. It is usually assumed that there is a one-to-one relationship between the star formation rate (SFR) inside a galaxy and the host halo mass in semi-analytical/numerical modeling of large-scale ionization maps during the epoch of reionization. However, more accurate simulations and observations suggest that the SFR and ionizing luminosity in galaxies may vary considerably even if the host halo mass is the same. This astrophysical scatter can introduce an additional non-Gaussianity in the [H i]21cm signal, which might not be captured adequately in the power spectrum. In this work, we have studied the impact of the scatter on the [H i]21cm bispectrum using semi-numerical simulations. We find that the scatter primarily affects small ionized regions, whereas the large ionized bubbles remain largely unaffected. Although, the fractional change in the [H i]21cm bispectra due to the scatter is found to be more than a factor of 10 at large scales (k1 ≲ 1 Mpc-1) for z=7.4, it is found to be statistically insignificant. However, at small scales (k1 ~ 2.55 Mpc-1), we have found the impact due to the scatter to be high in magnitude (|〈Δ B 〉/Bno-scatter| ~ 1) and statistically significant (|〈Δ B〉/σΔB| ≳ 5) at neutral fraction, x̅HI ~ 0.8 for z=7.4. The impact due to scatter is found to be even more prominent (|〈Δ B 〉/Bno-scatter| ≳ 10) at small scales for z=10 and x̅HI ~ 0.8, but with reduced statistical significance to some extent (|〈Δ B〉/σΔB| ~ 3), compared to z=7.4 at the same neutral fraction. We have also found that in the most optimistic scenario, SKA1-Low might be able to detect these signatures of astrophysical scatter, at ~ 3σ and ~ 5σ detection significance for x̅HI ~ 0.8 and 0.9 respectively, for the equilateral [H i]21cm bispectrum at z=7.4.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":null,"pages":null},"PeriodicalIF":6.4,"publicationDate":"2024-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142045580","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

GW230529_181500: a potential primordial binary black hole merger in the mass gap GW230529_181500：质量间隙中潜在的原始双黑洞合并

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2024-08-22 DOI: 10.1088/1475-7516/2024/08/030

Qing-Guo Huang, Chen Yuan, Zu-Cheng Chen and Lang Liu

引用次数: 0

Kerr-MOG-(A)dS black hole and its shadow in scalar-tensor-vector gravity theory 标量-张量-矢量引力理论中的克尔-MOG-(A)dS 黑洞及其阴影

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2024-08-22 DOI: 10.1088/1475-7516/2024/08/035

Wentao Liu, Di Wu, Xiongjun Fang, Jiliang Jing and Jieci Wang

{"title":"Kerr-MOG-(A)dS black hole and its shadow in scalar-tensor-vector gravity theory","authors":"Wentao Liu, Di Wu, Xiongjun Fang, Jiliang Jing and Jieci Wang","doi":"10.1088/1475-7516/2024/08/035","DOIUrl":"https://doi.org/10.1088/1475-7516/2024/08/035","url":null,"abstract":"The scalar-tensor-vector gravity (STVG) theory has attracted significant interest due to its ability to effectively address the issue of galaxy rotation curves and clusters of galaxies without considering the influence of dark matter. In this paper, we construct rotating black hole solutions with a cosmological constant in the STVG theory (i.e., Kerr-MOG-(A)dS black hole solutions), where the import of a gravitational charge as a source modifies the gravitational constant, determined by GG = GN(1+α). For Kerr-MOG-dS spacetime, the observer is situated at a specific location within the domain of outer communication, rather than being located infinitely far away. Since black hole shadows are shaped by light propagation in spacetime, the interaction between the MOG parameter and the cosmological constant is expected to produce novel effects on these shadows. As the cosmological constant Λ increases, the apparent size of the black hole shadow decreases. Additionally, the shadow expands with an increase in the MOG parameter α, reaching a maximum at a certain value, and its shape becomes more rounded under an arbitrary rotation parameter, which leads to degeneracy between different black hole parameters. However, by employing numerical ray-tracing techniques, we have found that gravitational lensing and the frame-dragging effect effectively distinguish this degeneracy. Our work contributes to a deeper understanding of black holes in modified gravity, their observational signatures, and constraints.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":null,"pages":null},"PeriodicalIF":6.4,"publicationDate":"2024-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142045412","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

Unruh-DeWitt particle detectors in bouncing cosmologies 弹跳宇宙中的 Unruh-DeWitt 粒子探测器

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2024-08-22 DOI: 10.1088/1475-7516/2024/08/034

Aindriú Conroy and Peter Taylor

引用次数: 0

Weak lensing of strong lensing: beyond the tidal regime 强透镜的弱透镜：超越潮汐机制

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2024-08-12 DOI: 10.1088/1475-7516/2024/08/021

Théo Duboscq, Natalie B. Hogg, Pierre Fleury and Julien Larena

{"title":"Weak lensing of strong lensing: beyond the tidal regime","authors":"Théo Duboscq, Natalie B. Hogg, Pierre Fleury and Julien Larena","doi":"10.1088/1475-7516/2024/08/021","DOIUrl":"https://doi.org/10.1088/1475-7516/2024/08/021","url":null,"abstract":"The analysis of strong lensing images usually involves an external convergence and shear, which are meant to model the effect of perturbations along the line of sight, on top of the main lens. Such a description of line-of-sight perturbations supposes that the corresponding gravitational fields can be treated in the tidal regime. Going one step further introduces additional effects, known as flexion, which have been hitherto neglected in strong lensing. In this work, we build a minimal model for the line-of-sight flexion, which adds four new complex parameters to the lens model. Contrary to convergence and shear, the line-of-sight flexion cannot be projected onto the main lens plane. For a ΛCDM cosmology, we predict the typical line-of-sight flexion to be on the order of 10-3 arcsec-1 on galactic scales. Neglecting its effect in lens modelling is found to bias the recovery of other parameters; in particular, the line-of-sight shear can be biased up to 2σ. Accounting for the line-of-sight flexion in our minimal framework restores accuracy, at the cost of degrading precision. With current imaging capabilities, the line-of-sight flexion is unlikely to be measurable on individual strong lensing images; it must therefore be considered a nuisance parameter rather than an observable in its own right.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":null,"pages":null},"PeriodicalIF":6.4,"publicationDate":"2024-08-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141973992","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

A hidden population of active galactic nuclei can explain the overabundance of luminous z > 10 objects observed by JWST 隐蔽的活动星系核群可以解释 JWST 观测到的 z > 10 大光度天体过多的原因

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2024-08-12 DOI: 10.1088/1475-7516/2024/08/025

Sahil Hegde, Michael M. Wyatt and Steven R. Furlanetto

{"title":"A hidden population of active galactic nuclei can explain the overabundance of luminous z > 10 objects observed by JWST","authors":"Sahil Hegde, Michael M. Wyatt and Steven R. Furlanetto","doi":"10.1088/1475-7516/2024/08/025","DOIUrl":"https://doi.org/10.1088/1475-7516/2024/08/025","url":null,"abstract":"The first wave of observations with JWST has revealed a striking overabundance of luminous galaxies at early times (z > 10) compared to models of galaxies calibrated to pre-JWST data. Early observations have also uncovered a large population of supermassive black holes (SMBHs) at z > 6. Because many of the high-z objects appear extended, the contribution of active galactic nuclei (AGNs) to the total luminosity has been assumed to be negligible. In this work, we use a semi-empirical model for assigning AGNs to galaxies to show that active galaxies can boost the stellar luminosity function (LF) enough to solve the overabundance problem while simultaneously remaining consistent with the observed morphologies of high-z sources. We construct a model for the composite AGN+galaxy LF by connecting dark matter halo masses to galaxy and SMBH masses and luminosities, accounting for dispersion in the mapping between host galaxy and SMBH mass and luminosity. By calibrating the model parameters — which characterize the M∙-M* relation — to a compilation of z > 10 JWST UVLF data, we show that AGN emission can account for the excess luminosity under a variety of scenarios, including one where 10% of galaxies host BHs of comparable luminosities to their stellar components. Using a sample of simulated objects and real observations, we demonstrate that such low-luminosity AGNs can be `hidden' in their host galaxies and be missed in common morphological analyses. We find that for this explanation to be viable, our model requires a population of BHs that are overmassive (M∙/M* ~ 10-2) with respect to their host galaxies compared to the local relation and are more consistent with the observed relation at z = 4-8. We explore the implications of this model for BH seed properties and comment on observational diagnostics necessary to further investigate this explanation.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":null,"pages":null},"PeriodicalIF":6.4,"publicationDate":"2024-08-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141973995","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

Sliding into DM: determining the local dark matter density and speed distribution using only the local circular speed of the galaxy 滑向暗物质：仅利用星系的局部圆周速度确定局部暗物质密度和速度分布

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2024-08-12 DOI: 10.1088/1475-7516/2024/08/022

Patrick G. Staudt, James S. Bullock, Michael Boylan-Kolchin, David Kirkby, Andrew Wetzel and Xiaowei Ou

{"title":"Sliding into DM: determining the local dark matter density and speed distribution using only the local circular speed of the galaxy","authors":"Patrick G. Staudt, James S. Bullock, Michael Boylan-Kolchin, David Kirkby, Andrew Wetzel and Xiaowei Ou","doi":"10.1088/1475-7516/2024/08/022","DOIUrl":"https://doi.org/10.1088/1475-7516/2024/08/022","url":null,"abstract":"We use FIRE-2 zoom simulations of Milky Way size disk galaxies to derive easy-to-use relationships between the observed circular speed of the Galaxy at the Solar location, vc, and dark matter properties of relevance for direct detection experiments: the dark matter density, the dark matter velocity dispersion, and the speed distribution of dark matter particles near the Solar location. We find that both the local dark matter density and 3D velocity dispersion follow tight power laws with vc. Using this relation together with the observed circular speed of the Milky Way at the Solar radius, we infer the local dark matter density and velocity dispersion near the Sun to be ρ = 0.42±0.06 GeV cm-3 and σ3D = 280+19-18 km s-1. We also find that the distribution of dark matter particle speeds is well-described by a modified Maxwellian with two shape parameters, both of which correlate with the observed vc. We use that modified Maxwellian to predict the speed distribution of dark matter near the Sun and find that it peaks at a most probable speed of 257 km s-1 and begins to truncate sharply above 470 km s-1. This peak speed is somewhat higher than expected from the standard halo model, and the truncation occurs well below the formal escape speed to infinity, with fewer very-high-speed particles than assumed in the standard halo model.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":null,"pages":null},"PeriodicalIF":6.4,"publicationDate":"2024-08-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141973991","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