Zobrazeno 1 - 10
of 206
pro vyhledávání: '"POULIN, Vivian"'
Early dark energy, an additional component of dark energy active in the decade of redshift before recombination, has emerged as one of the most effective models at reducing the $H_0$ tension between direct measurement of the Hubble parameter $H_0$ in
Externí odkaz:
http://arxiv.org/abs/2410.21459
We investigate the sensitivity of the 21cm power spectrum from cosmic dawn and the epoch of reionization to models of free-streaming dark radiation (parameterized through $N_{\rm eff}$) and interacting dark radiation-dark matter models (DM-DR). The l
Externí odkaz:
http://arxiv.org/abs/2410.01486
Cold New Early Dark Energy (Cold NEDE) addresses the Hubble tension through a triggered vacuum phase transition in the dark sector. In this paper, we constrain a phenomenological fluid model using recent cosmic microwave background likelihoods based
Externí odkaz:
http://arxiv.org/abs/2408.14537
The `cosmic calibration tension' is a $> 5\sigma$ discrepancy between the cosmological distance ladder built from baryonic acoustic oscillations (BAO) calibrated by the Planck/$\Lambda$CDM sound horizon ($r_s$) and Type Ia supernovae (SN1a) calibrate
Externí odkaz:
http://arxiv.org/abs/2407.18292
Autor:
Naredo-Tuero, Daniel, Escudero, Miguel, Fernández-Martínez, Enrique, Marcano, Xabier, Poulin, Vivian
Cosmological neutrino mass bounds are becoming increasingly stringent. The latest limit within $\Lambda$CDM from Planck 2018+ACT lensing+DESI is $\sum m_\nu < 0.072\,{\rm eV}$ at 95\% CL, very close to the minimum possible sum of neutrino masses ($\s
Externí odkaz:
http://arxiv.org/abs/2407.13831
Autor:
Del Grosso, Loris, Kaplan, David E, Melia, Tom, Poulin, Vivian, Rajendran, Surjeet, Smith, Tristan L
Motivated by the quantum description of gauge theories, we study the cosmological effects of relaxing the Hamiltonian and momentum constraints in general relativity and Gauss' law in electromagnetism. We show that the unconstrained theories have new
Externí odkaz:
http://arxiv.org/abs/2405.06374
Autor:
Karwal, Tanvi, Patel, Yashvi, Bartlett, Alexa, Poulin, Vivian, Smith, Tristan L., Pfeffer, Daniel N.
Frequentist profile likelihoods have seen a resurgence in cosmology, offering an alternative to Bayesian methods as they can circumvent the impact of prior-volume effects. This paper presents Procoli, a fast and accessible package to obtain profile l
Externí odkaz:
http://arxiv.org/abs/2401.14225
Autor:
Rogers, Keir K., Poulin, Vivian
We find that combined Planck cosmic microwave background, baryon acoustic oscillations and supernovae data analyzed under $\Lambda$CDM are in 4.9$\sigma$ tension with eBOSS Ly$\alpha$ forest in inference of the linear matter power spectrum at wavenum
Externí odkaz:
http://arxiv.org/abs/2311.16377
Axion-like early dark energy (EDE) as an extension to $\Lambda$CDM has been proposed as a possible solution to the 'Hubble tension'. We revisit this model using a new cosmic microwave background (CMB) temperature and polarization likelihood construct
Externí odkaz:
http://arxiv.org/abs/2311.00524
Autor:
Holm, Emil Brinch, Herold, Laura, Simon, Théo, Ferreira, Elisa G. M., Hannestad, Steen, Poulin, Vivian, Tram, Thomas
Previous studies based on Bayesian methods have shown that the constraints on cosmological parameters from the Baryonic Oscillation Spectroscopic Survey (BOSS) full-shape data using the Effective Field Theory of Large Scale Structure (EFTofLSS) depen
Externí odkaz:
http://arxiv.org/abs/2309.04468