Observational constraints on f(T) theory

By Puxun Wu, Hongwei Yu. 2010

312 citations recorded by the source corpus.

Abstract The f ( T ) theory, which is an extension of teleparallel, or torsion scalar T , gravity, is recently proposed to explain the present cosmic accelerating expansion with no need of dark energy. In this Letter, we first perform the statefinder analysis and Om ( z ) diagnostic to two concrete f ( T ) models, i.e., f ( T ) = α ( − T ) n and f ( T ) = − α T ( 1 − e p T 0 / T ) , and find that a crossing of phantom divide line is impossible for both models. This is contrary to an existing result where a crossing is claimed for the second model. We, then, study the constraints on them from the latest Union 2 Type Ia Supernova (Sne Ia) set, the baryonic acoustic oscillation (BAO), and the cosmic microwave background (CMB) radiation. Our results show that at the 95% confidence level Ω m 0 = 0.272 − 0.032 + 0.036 , n = 0.04 − 0.33 + 0.22 for Model 1 and Ω m 0 = 0.272 − 0.034 + 0.036 , p = − 0.02 − 0.20 + 0.31 for Model 2. A comparison of these two models with the ΛCDM by the χ Min 2 / dof ( dof : degree of freedom) criterion indicates that ΛCDM is still favored by observations. We also study the evolution of the equation of state for the effective dark energy in the theory and find that Sne Ia favors a phantom-like dark energy, while Sne Ia + BAO + CMB prefers a quintessence-like one.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/9d87780f77b88e2eddf2549e482a159923cbcda5

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Citations in the corpus

Bouncing cosmology in f(Q) symmetric teleparallel gravity (2020, background): “[43] P.”
Modified Gravity and Cosmology (2011, background): “A large number of papers have followed [135] in a short space of time, exploring the transition from deceleration to acceleration, observational constraints, conformal transformations, and structure formation [815, 1287, 932, 1288, 1227, 289, 134, 1286, 78, 933, 681, 1293, 1308, 79].”
Solar system constraints on f(T) gravity (2012, methodology): “(2012), Wu & Yu (2010b), Bengochea (2011), Ferraro & Fiorini (2011c), Daouda et al. (2011), Daouda et al. (2012a)), as well as in its black hole solutions (Wang (2011), Miao et al. (2011), Wei et al (2012), Ferraro & Fiorini (2011b)), the authors still use thsimple relation between the vierbeins…”
Accelerating universe from F(T) gravity (2010, background): “[37–77]).”
f(T) teleparallel gravity and cosmology (2015, background): “This is the first order correction in every realistic f(T ) gravity, in which we expect αT 2 T [193, 477], since T (like R) is small in 8πG-units.”
Observational constraints on teleparallel dark energy (2011, background): “The first is to replace T by an arbitrary function f(T ) [41, 42, 46–72], similar to f(R) extensions of GR, and obtain new interesting terms in the field equations.”