TY - JOUR
T1 - Time-sliced perturbation theory II
T2 - baryon acoustic oscillations and infrared resummation
AU - Blas, Diego
AU - Garny, Mathias
AU - Ivanov, Mikhail M.
AU - Sibiryakov, Sergey
PY - 2016/7
Y1 - 2016/7
N2 - We use time-sliced perturbation theory (TSPT) to give an accurate description of the infrared non-linear effects affecting the baryonic acoustic oscillations (BAO) present in the distribution of matter at very large scales. In TSPT this can be done via a systematic resummation that has a simple diagrammatic representation and does not involve uncontrollable approximations. We discuss the power counting rules and derive explicit expressions for the resummed matter power spectrum up to next-to leading order and the bispectrum at the leading order. The two-point correlation function agrees well with N-body data at BAO scales. The systematic approach also allows to reliably assess the shift of the baryon acoustic peak due to non-linear effects.
AB - We use time-sliced perturbation theory (TSPT) to give an accurate description of the infrared non-linear effects affecting the baryonic acoustic oscillations (BAO) present in the distribution of matter at very large scales. In TSPT this can be done via a systematic resummation that has a simple diagrammatic representation and does not involve uncontrollable approximations. We discuss the power counting rules and derive explicit expressions for the resummed matter power spectrum up to next-to leading order and the bispectrum at the leading order. The two-point correlation function agrees well with N-body data at BAO scales. The systematic approach also allows to reliably assess the shift of the baryon acoustic peak due to non-linear effects.
KW - Astrophysics - Cosmology and Nongalactic Astrophysics, High Energy Physics - Phenomenology, High Energy Physics - Theory
U2 - 10.1088/1475-7516/2016/07/028
DO - 10.1088/1475-7516/2016/07/028
M3 - Article
VL - 2016
JO - Journal of Cosmology and Astroparticle Physics
JF - Journal of Cosmology and Astroparticle Physics
SN - 1475-7516
M1 - 028
ER -
TY - JOUR
T1 - Renormalization of Hořava gravity
AU - Barvinsky, Andrei O.
AU - Blas, Diego
AU - Herrero-Valea, Mario
AU - Sibiryakov, Sergey M.
AU - Steinwachs, Christian F.
PY - 2016/3/8
Y1 - 2016/3/8
N2 - We prove perturbative renormalizability of projectable Hořava gravity. The key element of the argument is the choice of a gauge which ensures the correct anisotropic scaling of the propagators and their uniform falloff at large frequencies and momenta. This guarantees that the counterterms required to absorb the loop divergences are local and marginal or relevant with respect to the anisotropic scaling. Gauge invariance of the counterterms is achieved by making use of the background-covariant formalism. We also comment on the difficulties of this approach when addressing the renormalizability of the nonprojectable model.
AB - We prove perturbative renormalizability of projectable Hořava gravity. The key element of the argument is the choice of a gauge which ensures the correct anisotropic scaling of the propagators and their uniform falloff at large frequencies and momenta. This guarantees that the counterterms required to absorb the loop divergences are local and marginal or relevant with respect to the anisotropic scaling. Gauge invariance of the counterterms is achieved by making use of the background-covariant formalism. We also comment on the difficulties of this approach when addressing the renormalizability of the nonprojectable model.
KW - High Energy Physics - Theory, General Relativity and Quantum Cosmology
U2 - 10.1103/PhysRevD.93.064022
DO - 10.1103/PhysRevD.93.064022
M3 - Article
VL - 93
JO - Physical Review D (Particles, Fields, Gravitation and Cosmology)
JF - Physical Review D (Particles, Fields, Gravitation and Cosmology)
SN - 1550-7998
M1 - 064022
ER -