TY - JOUR
T1 - Atacama Cosmology Telescope
T2 - Constraints on prerecombination early dark energy
AU - Hill, J. Colin
AU - Calabrese, Erminia
AU - Aiola, Simone
AU - Battaglia, Nicholas
AU - Bolliet, Boris
AU - Choi, Steve K.
AU - Devlin, Mark J.
AU - Duivenvoorden, Adriaan J.
AU - Dunkley, Jo
AU - Ferraro, Simone
AU - Gallardo, Patricio A.
AU - Gluscevic, Vera
AU - Hasselfield, Matthew
AU - Hilton, Matt
AU - Hincks, Adam D.
AU - HloŽek, Renée
AU - Koopman, Brian J.
AU - Kosowsky, Arthur
AU - La Posta, Adrien
AU - Louis, Thibaut
AU - Madhavacheril, Mathew S.
AU - McMahon, Jeff
AU - Moodley, Kavilan
AU - Naess, Sigurd
AU - Natale, Umberto
AU - Nati, Federico
AU - Newburgh, Laura
AU - Niemack, Michael D.
AU - Page, Lyman A.
AU - Partridge, Bruce
AU - Qu, Frank J.
AU - Salatino, Maria
AU - Schillaci, Alessandro
AU - Sehgal, Neelima
AU - Sherwin, Blake D.
AU - Sifón, Cristóbal
AU - Spergel, David N.
AU - Staggs, Suzanne T.
AU - Storer, Emilie R.
AU - Van Engelen, Alexander
AU - Vavagiakis, Eve M.
AU - Wollack, Edward J.
AU - Xu, Zhilei
N1 - Publisher Copyright:
© 2022 us.
PY - 2022/6/15
Y1 - 2022/6/15
N2 - The early dark energy (EDE) scenario aims to increase the value of the Hubble constant (H0) inferred from cosmic microwave background (CMB) data over that found in the standard cosmological model (ΛCDM), via the introduction of a new form of energy density in the early Universe. The EDE component briefly accelerates cosmic expansion just prior to recombination, which reduces the physical size of the sound horizon imprinted in the CMB. Previous work has found that nonzero EDE is not preferred by Planck CMB power spectrum data alone, which yield a 95% confidence level (C.L.) upper limit fEDE<0.087 on the maximal fractional contribution of the EDE field to the cosmic energy budget. In this paper, we fit the EDE model to CMB data from the Atacama Cosmology Telescope (ACT) data release 4. We find that a combination of ACT, large-scale Planck TT (similar to WMAP), Planck CMB lensing, and BAO data prefers the existence of EDE at >99.7% C.L.: fEDE=0.091-0.036+0.020, with H0=70.9-2.0+1.0 km/s/Mpc (both 68% C.L.). From a model-selection standpoint, we find that EDE is favored over ΛCDM by these data at roughly 3σ significance. In contrast, a joint analysis of the full Planck and ACT data yields no evidence for EDE, as previously found for Planck alone. We show that the preference for EDE in ACT alone is driven by its TE and EE power spectrum data. The tight constraint on EDE from Planck alone is driven by its high-ℓ TT power spectrum data. Understanding whether these differing constraints are physical in nature, due to systematics, or simply a rare statistical fluctuation is of high priority. The best-fit EDE models to ACT and Planck exhibit coherent differences across a wide range of multipoles in TE and EE, indicating that a powerful test of this scenario is anticipated with near-future data from ACT and other ground-based experiments.
AB - The early dark energy (EDE) scenario aims to increase the value of the Hubble constant (H0) inferred from cosmic microwave background (CMB) data over that found in the standard cosmological model (ΛCDM), via the introduction of a new form of energy density in the early Universe. The EDE component briefly accelerates cosmic expansion just prior to recombination, which reduces the physical size of the sound horizon imprinted in the CMB. Previous work has found that nonzero EDE is not preferred by Planck CMB power spectrum data alone, which yield a 95% confidence level (C.L.) upper limit fEDE<0.087 on the maximal fractional contribution of the EDE field to the cosmic energy budget. In this paper, we fit the EDE model to CMB data from the Atacama Cosmology Telescope (ACT) data release 4. We find that a combination of ACT, large-scale Planck TT (similar to WMAP), Planck CMB lensing, and BAO data prefers the existence of EDE at >99.7% C.L.: fEDE=0.091-0.036+0.020, with H0=70.9-2.0+1.0 km/s/Mpc (both 68% C.L.). From a model-selection standpoint, we find that EDE is favored over ΛCDM by these data at roughly 3σ significance. In contrast, a joint analysis of the full Planck and ACT data yields no evidence for EDE, as previously found for Planck alone. We show that the preference for EDE in ACT alone is driven by its TE and EE power spectrum data. The tight constraint on EDE from Planck alone is driven by its high-ℓ TT power spectrum data. Understanding whether these differing constraints are physical in nature, due to systematics, or simply a rare statistical fluctuation is of high priority. The best-fit EDE models to ACT and Planck exhibit coherent differences across a wide range of multipoles in TE and EE, indicating that a powerful test of this scenario is anticipated with near-future data from ACT and other ground-based experiments.
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U2 - 10.1103/PhysRevD.105.123536
DO - 10.1103/PhysRevD.105.123536
M3 - Article
AN - SCOPUS:85134244067
SN - 2470-0010
VL - 105
JO - Physical Review D
JF - Physical Review D
IS - 12
M1 - e123536
ER -