We propose a one-parameter extension to $Λ$CDM, expected to strongly affect cosmological tensions. An effective dark radiation component in the early universe redshifts away as hot dark matter, then quintessence, tracking the dominant equation-of-state parameter and leaving a falsifiable torsion field in the current epoch. This picture results from a new Poincaré gauge theory (PGT), one of the most promising among the latest batch of 58 PGTs found to be both power-counting renormalisable and free from ghosts and tachyons. We systematically categorise the cosmologies of 33 of these PGTs, as special cases of the most general parity-preserving, Ostrogradsky-stable PGT with a purely Yang-Mills action. The theory we consider contains two propagating massless gravitons, which may be $J^P=2^+$ (long-range gravitation and gravitational waves). A conspiracy among the coupling constants eliminates the spatial curvature $k\in\{\pm 1,0\}$ from the field equations. We show that this `$k$-screening' is not restricted to conformal gravity theories. The flat Friedmann equations are then emergent, with potentially tension-resolving freedom at the early scale-invariant epoch that reliably gives way to an attractor-like state of modern $Λ$CDM evolution. We compare with related theories and promising special cases, such as $k$-screened theories with negative-definite effective $k$, and more traditional theories with effective $Λ$ and a $J^P=0^-$ massive graviton (dark matter candidate). As a bonus, we analyse similarly constrained actions in the new extended Weyl gauge theory (eWGT). We show that in cosmology, PGT and eWGT span exactly the same classical phenomenology up to a linear map between their coupling constants, hinting at a deeper relationship between the two.
Addressing $H_0$ and $S_8$ tensions within $f(Q)$ cosmology
University of the Basque Country UPV/EHU（巴斯克大学）；National Technical University of Athens（雅典国立技术大学）；National Observatory of Athens（雅典国家天文台）；IKERBASQUE, Basque Foundation for Science（伊克尔巴斯克，巴斯克科学基金会）；CAS Key Laboratory for Researches in Galaxies and Cosmology, Department of Astronomy, University of Science and Technology of China（中国科学院星系与宇宙学重点实验室，中国科学技术大学天文系）；Universidad Católica del Norte（北天主教大学）
Addressing the $H_0$ tension through matter with pressure and no early dark energy
Università di Camerino（卡梅里诺大学）；INAF - Osservatorio Astronomico di Brera（布拉拉天文台（意大利国家天体物理研究所））；Istituto Nazionale di Fisica Nucleare, Sezione di Perugia（意大利国家核物理研究院佩鲁贾分部）；SUNY Polytechnic Institute（纽约州立大学理工学院）；Al-Farabi Kazakh National University（阿尔法拉比哈萨克国立大学）；ICRANet（国际相对论天体物理中心网络）
Revisiting the phenomenologically emergent dark energy model: is non-zero equation of state of dark matter favored by DESI DR2?
School of Physics, Ningxia University（宁夏大学物理学院）；MOE Key Laboratory of Data Analytics and Optimization for Smart Industry, Northeastern University（教育部智能工业数据分析与优化重点实验室，东北大学）；National Frontiers Science Center for Industrial Intelligence and Systems Optimization, Northeastern University（国家工业智能与系统优化前沿科学中心，东北大学）
Boltzmann Dynamics in K-essence Cosmology: Photon Propagation in an Emergent Spacetime
University of Calcutta（加尔各答大学）；Sister Nivedita University（西塔·尼维迪塔大学）；Inter-University Center for Astronomy and Astrophysics（跨大学天文与天体物理中心）；Prabhat Kumar College（普拉巴特·库马尔学院）；Institute of Astronomy, Space and Earth Science（天文、空间与地球科学研究院）
No preference for generalized emergent dark energy from current cosmological data
Lovely Professional University（洛维专业大学）；Babeș-Bolyai University（巴贝什-波约依大学）；Khazar University（阿塞拜疆卡扎尔大学）；Università di Napoli “Federico II”（那不勒斯费德里科二世大学）；Istituto Nazionale di Fisica Nucleare (INFN)（意大利国家核物理研究所）；Scuola Superiore Meridionale（南方高等学院）；Madhabdev University（马德哈伯德夫大学）；Zhejiang Normal University（浙江师范大学）；Walailak University（瓦拉莱克大学）
BAO miscalibration cannot rescue late-time solutions to the Hubble tension
University of Trento（特伦托大学）；Trento Institute for Fundamental Physics and Applications (TIFPA)-INFN（特伦托基础物理与应用研究所（TIFPA）-意大利国家核物理研究所）；Istanbul Technical University（伊斯坦布尔技术大学）；University of Sheffield（谢菲尔德大学）；Universidade Federal do Espírito Santo（圣埃斯皮里图联邦大学）；INAF – Osservatorio Astronomico di Trieste（意大利国家天体物理研究所的里雅斯特天文台）；IFPU – Institute for Fundamental Physics of the Universe（宇宙基础物理研究所）；University of Ioannina（约阿尼纳大学）
Comment on Cosmological constraints on unimodular gravity models with diffusion (arXiv:2211.07424): thermodynamic inadmissibility of the H0 tension resolution mechanism
Perimeter Institute for Theoretical Physics（Perimeter理论物理研究所）；Tsinghua University（清华大学）；Cornell University（康奈尔大学）；Max Planck Institute for Gravitational Physics (Albert Einstein Institute)（马克斯·普朗克引力物理研究所（爱因斯坦研究所））；California Institute of Technology（加州理工学院）
