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Beyond dynamical dark energy: the role of dark sector interactions after DESI DR2
Weiqiang Yang, Sibo Zhang, Supriya Pan +2
Recent DESI DR2 observations have renewed interest in extensions of the CDM cosmological model, particularly through indications of a time-varying dark energy equation of state.…
The generalized second law as a thermodynamic selection criterion for dynamical dark energy
Marcos H. Cruz, Miguel Cruz, Joel Saavedra +1
The growing number of generalized horizon entropy proposals has led to a wide variety of modified cosmological models, yet there is currently no general physical principle capable…
Probing the sound speed and clustering of dark energy
Yuhang Yang, Qingqing Wang, Xin Ren +2
Recent Dark Energy Spectroscopic Instrument (DESI) observations favor a dynamical dark energy component with a time-varying equation-of-state, potentially crossing the cosmological…
Chaotic imprints of dark matter in extreme mass-ratio inspirals
Mustapha Azreg-Aïnou, Mustapha Azreg-Aïnou, Mubasher Jamil +1
Extreme mass-ratio inspirals (EMRIs) are among the most powerful probes of strong-field gravity and of the environments surrounding supermassive compact objects. Motivated by the e…
Dark energy perturbations and the robustness of cosmological neutrino-mass constraints
Yu-Hang Yang, Emmanuel N. Saridakis, Yi-Fu Cai +1
Cosmological observations are placing increasingly stringent bounds on the sum of neutrino masses, approaching the lower limits implied by neutrino oscillation experiments. Recent…
Accelerating scaling solutions from dark matter particle creation
Sudip Halder, Jaume de Haro, Supriya Pan +3
This article opens new window to obtain accelerating scaling attractors without any need of dark energy. We study cosmological dynamics in a two-fluid system where pressureless dar…