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

Axial perturbations of black holes with primary scalar hair 带原生标量毛的黑洞轴向微扰

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2025-05-30 DOI: 10.1088/1475-7516/2025/05/102

Christos Charmousis, Simon Iteanu, David Langlois, Karim Noui

{"title":"Axial perturbations of black holes with primary scalar hair","authors":"Christos Charmousis, Simon Iteanu, David Langlois, Karim Noui","doi":"10.1088/1475-7516/2025/05/102","DOIUrl":"https://doi.org/10.1088/1475-7516/2025/05/102","url":null,"abstract":"We study axial perturbations of static black holes with primary hair in a family of degenerate higher-order scalar-tensor (DHOST) theories. These solutions possess a scalar charge, fully independent of the mass, leading to a continuous one-parameter deformation of the standard Schwarzschild black hole. Starting from these solutions, we also construct new black holes, solutions of other DHOST theories, obtained via disformal transformations of the metric. In particular, we investigate two specific types of disformal transformations: the first leading to a theory where gravitational waves propagate at the speed of light, the second to a Horndeski theory, where the equations of motion remain second order. The dynamics of axial perturbations can be formally related to the general relativistic equations of motion of axial perturbations in an effective metric. The causal structure of the effective metric differs from that of the background metric, leading to distinct gravitational and luminous horizons. Using a WKB approximation, we compute the quasi-normal modes for the Schrödinger-like equation associated with the effective metric outside the gravitational horizon.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"9 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144177404","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

Constraining eV-scale axion-like particle dark matter: insights from the M87 Galaxy 约束ev尺度轴子样粒子暗物质：来自M87星系的见解

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2025-05-30 DOI: 10.1088/1475-7516/2025/05/100

Arpan Kar, Sourov Roy, Pratick Sarkar

{"title":"Constraining eV-scale axion-like particle dark matter: insights from the M87 Galaxy","authors":"Arpan Kar, Sourov Roy, Pratick Sarkar","doi":"10.1088/1475-7516/2025/05/100","DOIUrl":"https://doi.org/10.1088/1475-7516/2025/05/100","url":null,"abstract":"Axion-like particles (ALPs) can account for the observed dark matter (DM) of the Universe and if their masses are at the eV scale, they can decay into\u0000infrared, optical and ultraviolet photons\u0000with a decay lifetime larger than the age of the Universe.\u0000We analyze multi-wavelength data obtained from the central region of Messier 87 (M87) galaxy\u0000by several telescopes, such as, Swift, Astrosat, Kanata, Spitzer and\u0000International Ultraviolet Explorer\u0000in the infrared to ultraviolet frequencies\u0000(∼ 2 × 1014 Hz - 3 × 1015 Hz),\u0000to constrain the narrow emission lines indicative of the eV scale ALP DM decay.\u0000We derive constraints on the ALP coupling to two photons (<italic toggle=\"yes\">gaγγ\u0000</italic>) for ALP mass range 2 eV ≲ <italic toggle=\"yes\">ma\u0000</italic> ≲ 20 eV,\u0000assuming ALPs form the DM in the M87 halo.\u0000We find that our bounds on ALP-two-photon coupling\u0000can become stronger than the existing ones by an order of magnitude in the ALP\u0000mass range 8 eV ≲ <italic toggle=\"yes\">ma\u0000</italic> ≲ 20 eV.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"5 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144177405","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

Detectability of Supernova remnants with the Southern Wide-field Gamma-ray Observatory 南方宽视场伽玛射线天文台对超新星遗迹的可探测性

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2025-05-28 DOI: 10.1088/1475-7516/2025/05/096

N. Scharrer, S.T. Spencer, V. Joshi and A.M.W. Mitchell

引用次数: 0

How deep is the dip and how tall are the wiggles in inflationary power spectra? 膨胀功率谱的下降有多深，波动有多高？

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2025-05-28 DOI: 10.1088/1475-7516/2025/05/097

Vadim Briaud, Alexandros Karam, Niko Koivunen, Eemeli Tomberg, Hardi Veermäe and Vincent Vennin

引用次数: 0

Emulating the Lyman-Alpha forest 1D power spectrum from cosmological simulations: new models and constraints from the eBOSS measurement 从宇宙学模拟中模拟莱曼-阿尔法森林一维功率谱：来自eBOSS测量的新模型和约束

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2025-05-28 DOI: 10.1088/1475-7516/2025/05/099

Michael Walther, Nils Schöneberg, Solène Chabanier, Eric Armengaud, Jean Sexton, Christophe Yèche, Julien Lesgourgues, Markus R. Mosbech, Corentin Ravoux, Nathalie Palanque-Delabrouille and Zarija Lukić

{"title":"Emulating the Lyman-Alpha forest 1D power spectrum from cosmological simulations: new models and constraints from the eBOSS measurement","authors":"Michael Walther, Nils Schöneberg, Solène Chabanier, Eric Armengaud, Jean Sexton, Christophe Yèche, Julien Lesgourgues, Markus R. Mosbech, Corentin Ravoux, Nathalie Palanque-Delabrouille and Zarija Lukić","doi":"10.1088/1475-7516/2025/05/099","DOIUrl":"https://doi.org/10.1088/1475-7516/2025/05/099","url":null,"abstract":"We present the Lyssa suite of high-resolution cosmological simulations of the Lyman-α forest designed for cosmological analyses. These 18 simulations have been run using the Nyx code with 40963 hydrodynamical cells in a 120 Mpc (∼ 81 Mpc/h) comoving box and individually provide sub-percent level convergence of the Lyman-α forest 1d flux power spectrum. We build a Gaussian process emulator for the Lyssa simulations in the lym1d likelihood framework to interpolate the power spectrum at arbitrary parameter values. We validate this emulator based on leave-one-out tests and based on the parameter constraints for simulations outside of the training set. We also perform comparisons with a previous emulator, showing a percent level accuracy and a good recovery of the expected cosmological parameters. Using this emulator we derive constraints on the linear matter power spectrum amplitude and slope parameters ALyα and nLyα. While the best-fit Planck ΛCDM model has ALyα = 8.79 and nLyα = -2.363, from DR14 eBOSS data we find that ALyα < 7.6 (95% CI) and nLyα = -2.369 ± 0.008. The low value of ALyα, in tension with Planck, is driven by the correlation of this parameter with the mean transmission of the Lyman-α forest. This tension disappears when imposing a well-motivated external prior on this mean transmission, in which case we find ALyα = 9.8 ± 1.1 in accordance with Planck.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"26 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144164908","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

Reproducing ΛCDM-like solutions in f(Q) gravity: a comprehensive study across all connection branches 在f(Q)重力中再现ΛCDM-like解：对所有连接分支的综合研究

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2025-05-28 DOI: 10.1088/1475-7516/2025/05/098

Saikat Chakraborty, Jibitesh Dutta, Daniele Gregoris, Khamphee Karwan and Wompherdeiki Khyllep

{"title":"Reproducing ΛCDM-like solutions in f(Q) gravity: a comprehensive study across all connection branches","authors":"Saikat Chakraborty, Jibitesh Dutta, Daniele Gregoris, Khamphee Karwan and Wompherdeiki Khyllep","doi":"10.1088/1475-7516/2025/05/098","DOIUrl":"https://doi.org/10.1088/1475-7516/2025/05/098","url":null,"abstract":"Given the remarkable success of the ΛCDM model in fitting various cosmological observations, a pertinent question in assessing the phenomenological viability of modified gravity theories is whether they can reproduce an exactly ΛCDM-like cosmic background evolution. In this paper, we address this question in the context of f(Q) gravity, where Q denotes the nonmetricity scalar. It is known that there are three possible symmetric teleparallel connection branches that respect the cosmological principles of spatial homogeneity, isotropy, and global spatial flatness. By enforcing a ΛCDM-like background evolution via the cosmographic condition j(z) = 1, where j is the jerk parameter, we reconstruct the ΛCDM-mimicking f(Q) theory for each of the three possible connection branches. For the first connection branch, also known as the “coincident gauge” in cosmology, we recover the previously known result that a theory of the form f(Q) = -2Λ + αQ + β√Q can exactly reproduce a ΛCDM-like cosmic evolution. Furthermore, we establish that the stability of the ΛCDM-like cosmic solution within this reconstructed f(Q), as well as the robustness of the reconstructed f(Q) form with respect to small errors in the astrophysical measurements of the jerk parameter. For the second connection branch, we analytically reconstruct the ΛCDM-mimicking f(Q) to be of the form f(Q) = -2Λ + αQ - βQ2. For the third connection branch, we could decouple the evolution equation for the dynamical connection function, which enabled us to perform a numerical reconstruction. Our analysis proves that, at least at the background level, it is possible to obtain ΛCDM-mimicking f(Q) models for all the three possible connection branches. These models effectively reduce to (STE)GR in the past while possessing a positive effective gravitational coupling throughout.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"243 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144164907","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 end of easy phenomenology for CMB experiments: A case study in the dark sector 宇宙微波背景实验简单现象学的终结：黑暗领域的个案研究

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2025-05-27 DOI: 10.1088/1475-7516/2025/05/094

Cynthia Trendafilova, Ali Rida Khalife and Silvia Galli

{"title":"The end of easy phenomenology for CMB experiments: A case study in the dark sector","authors":"Cynthia Trendafilova, Ali Rida Khalife and Silvia Galli","doi":"10.1088/1475-7516/2025/05/094","DOIUrl":"https://doi.org/10.1088/1475-7516/2025/05/094","url":null,"abstract":"The precision of Cosmic Microwave Background (CMB) experiments, specifically its lensing reconstruction, has reached the limit where non-linear corrections cannot be ignored. Neglecting these corrections results in biased constraints on cosmological parameters. In this work, we use lensing data from Planck and the South Pole Telescope third generation camera (SPT-3G) taken in 2018 to highlight the impact of these biases in two ways. First, we estimate the shifts due to ignoring non-linear corrections in ΛCDM. We find 0.2–0.6σ shifts in the Dark Matter (DM) fraction, the Hubble constant, and the amplitude of matter fluctuations at 8h-1 Mpc. Second, we estimate the loss in constraining power for not including data sensitive to non-linear corrections. As a case study, we consider two interacting DM models, for which such corrections are not readily available in existing CMB Boltzmann codes. The first one is DM interacting with baryons, while the second is DM interacting with Dark Radiation (DR). For the former case, when we add primary CMB data from SPT-3G 2018 observations, we find that constraints on model parameters improve by 10–20% compared to previous studies. However, we forecast a further 50% improvement on these constraints if one could include current or upcoming SPT-3G lensing data. For the case of DM interacting with DR, no meaningful constraints on the model parameters are found without including information from CMB lensing. We also highlight that the codes used to calculate non-linear corrections in ΛCDM, specifically HaloFit andHMCode, provide unstable results when improperly used for these extended models. These outcomes constitute a reason for caution if using CMB lensing data when constraining such models, as well as a motivation for estimating their non-linear corrections.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"2 1","pages":"094"},"PeriodicalIF":6.4,"publicationDate":"2025-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144165496","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

Ultra-low-frequency gravitational waves from individual supermassive black hole binaries as standard sirens 来自单个超大质量黑洞双星的超低频率引力波作为标准警报

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2025-05-27 DOI: 10.1088/1475-7516/2025/05/095

Ling-Feng Wang, Yue Shao, Si-Ren Xiao, Jing-Fei Zhang and Xin Zhang

{"title":"Ultra-low-frequency gravitational waves from individual supermassive black hole binaries as standard sirens","authors":"Ling-Feng Wang, Yue Shao, Si-Ren Xiao, Jing-Fei Zhang and Xin Zhang","doi":"10.1088/1475-7516/2025/05/095","DOIUrl":"https://doi.org/10.1088/1475-7516/2025/05/095","url":null,"abstract":"Ultra-low-frequency gravitational waves (GWs) generated by individual inspiraling supermassive black hole binaries (SMBHBs) at the centers of galaxies may be detected by pulsar timing arrays (PTAs) in the future. These GW signals, which encode absolute cosmic distances, can serve as bright and dark sirens, potentially evolving into a precise cosmological probe. Here, we show that a PTA in the era of the Square Kilometre Array, comprising 100 millisecond pulsars, could potentially detect about 25 bright sirens and 41 dark sirens over a 10-year observation period. The bright sirens, combined with cosmic microwave background data, offer capabilities comparable to current mainstream joint cosmological observations for measuring the equation of state of dark energy. The dark sirens could achieve a measurement precision of the Hubble constant close to that of current distance-ladder observations. Our results suggest that ultra-low-frequency GWs from individual SMBHBs are of great significance in investigating the nature of dark energy and determining the Hubble constant.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"238 1","pages":"095"},"PeriodicalIF":6.4,"publicationDate":"2025-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144164911","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

Primordial gravitational waves in quadratic gravity 二次重力中的原始引力波

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2025-05-27 DOI: 10.1088/1475-7516/2025/05/093

Jisuke Kubo and Jeffrey Kuntz

{"title":"Primordial gravitational waves in quadratic gravity","authors":"Jisuke Kubo and Jeffrey Kuntz","doi":"10.1088/1475-7516/2025/05/093","DOIUrl":"https://doi.org/10.1088/1475-7516/2025/05/093","url":null,"abstract":"Quadratic gravity is a fourth-order (in derivatives) theory that can serve as an attractive upgrade to the standard description of gravity provided by General Relativity, thanks to its renormalizability and its built-in description of primordial inflation. We bring quadratic gravity into a second-order form by introducing an auxiliary tensor field and we consider the primordial tensor fluctuations (gravitational waves) in the theory around a Friedmann-Lemaître-Robertson-Walker background. After a canonical quantization of the perturbations, we calculate the tensor power spectrum in quasi de Sitter spacetime. We find that the spectral index nt and the amplitude At of the tensor power spectrum are both suppressed by the factor (1 + 2H2*/m2gh)-1, where H* is the Hubble rate at horizon exit and mgh is the mass of the spin-two ghost. This restores the slow-roll consistency condition familiar from single-field inflation models, where the tensor-to-scalar ratio r is equal to -8nt in the lowest nontrivial order in the slow-roll approximation. We also discuss the well-known issue of the ghost problem in fourth-order theories and how it pertains to the results at hand.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"36 1","pages":"093"},"PeriodicalIF":6.4,"publicationDate":"2025-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144165303","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

Some times in standard cosmology 有时在标准宇宙学中

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2025-05-27 DOI: 10.1088/1475-7516/2025/05/092

Lukas Tobias Hergt and Douglas Scott

引用次数: 0