Is there an effect of a nontrivial cT during inflation?

被引：43

作者：

Cai, Yong ^{[1
]}

Wang, Yu-Tong ^{[1
]}

Piao, Yun-Song ^{[1
,2
]}

机构：

[1] Univ Chinese Acad Sci, Sch Phys, Beijing 100049, Peoples R China

[2] Chinese Acad Sci, Inst Theoret Phys, State Key Lab Theoret Phys, POB 2735, Beijing 100190, Peoples R China

来源：

PHYSICAL REVIEW D | 2016年 / 93卷 / 06期

关键词：

COSMOLOGY; UNIVERSE; INVARIANCE; EQUATIONS; SPECTRUM; FLATNESS; HORIZON;

D O I：

10.1103/PhysRevD.93.063005

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Recently, we have shown that the propagation speed c(T) of the primordial gravitational waves (GWs) might be nontrivially varying during inflation, which could induce local oscillations in the power spectrum of primordial GWs. In this paper, we numerically confirm that, although with a disformal redefinition of the metric the nontrivial c(T) may be set as unity, the power spectrum in the frame with c(T) = 1 is completely the same as that in the original disformal frame, i.e., the oscillating shape in the power spectrum is still reserved, since here the effect of c(T) is actually encoded in the nontrivially varying Hubble parameter. In addition, we also clarify how to obtain a blue-tilted GWs spectrum by imposing a rapidly decreasing c(T) during inflation.

引用

页数：8

共 69 条

[1] Observation of Gravitational Waves from a Binary Black Hole Merger [J].

Abbott, B. P. ;

Abbott, R. ;

Abbott, T. D. ;

Abernathy, M. R. ;

Acernese, F. ;

Ackley, K. ;

Adams, C. ;

Adams, T. ;

Addesso, P. ;

Adhikari, R. X. ;

Adya, V. B. ;

Affeldt, C. ;

Agathos, M. ;

Agatsuma, K. ;

Aggarwal, N. ;

Aguiar, O. D. ;

Aiello, L. ;

Ain, A. ;

Ajith, P. ;

Allen, B. ;

Allocca, A. ;

Altin, P. A. ;

Anderson, S. B. ;

Anderson, W. G. ;

Arai, K. ;

Arain, M. A. ;

Araya, M. C. ;

Arceneaux, C. C. ;

Areeda, J. S. ;

Arnaud, N. ;

Arun, K. G. ;

Ascenzi, S. ;

Ashton, G. ;

Ast, M. ;

Aston, S. M. ;

Astone, P. ;

Aufmuth, P. ;

Aulbert, C. ;

Babak, S. ;

Bacon, P. ;

Bader, M. K. M. ;

Baker, P. T. ;

Baldaccini, F. ;

Ballardin, G. ;

Ballmer, S. W. ;

Barayoga, J. C. ;

Barclay, S. E. ;

Barish, B. C. ;

Barker, D. ;

Barone, F. .

PHYSICAL REVIEW LETTERS, 2016, 116 (06)

[2] Inflation with moderately sharp features in the speed of sound: Generalized slow roll and in-in formalism for power spectrum and bispectrum [J].

Achucarro, Ana ;

Atal, Vicente ;

Hu, Bin ;

Ortiz, Pablo ;

Torrado, Jesus .

PHYSICAL REVIEW D, 2014, 90 (02)

[3] Joint Analysis of BICEP2/Keck Array and Planck Data [J].

Ade, P. A. R. ;

Aghanim, N. ;

Ahmed, Z. ;

Aikin, R. W. ;

Alexander, K. D. ;

Arnaud, M. ;

Aumont, J. ;

Baccigalupi, C. ;

Banday, A. J. ;

Barkats, D. ;

Barreiro, R. B. ;

Bartlett, J. G. ;

Bartolo, N. ;

Battaner, E. ;

Benabed, K. ;

Benoit, A. ;

Benoit-Levy, A. ;

Benton, S. J. ;

Bernard, J. -P. ;

Bersanelli, M. ;

Bielewicz, P. ;

Bischoff, C. A. ;

Bock, J. J. ;

Bonaldi, A. ;

Bonavera, L. ;

Bond, J. R. ;

Borrill, J. ;

Bouchet, F. R. ;

Boulanger, F. ;

Brevik, J. A. ;

Bucher, M. ;

Buder, I. ;

Bullock, E. ;

Burigana, C. ;

Butler, R. C. ;

Buza, V. ;

Calabrese, E. ;

Cardoso, J. -F. ;

Catalano, A. ;

Challinor, A. ;

Chary, R. -R. ;

Chiang, H. C. ;

Christensen, P. R. ;

Colombo, L. P. L. ;

Combet, C. ;

Connors, J. ;

Couchot, F. ;

Coulais, A. ;

Crill, B. P. ;

Curto, A. .

PHYSICAL REVIEW LETTERS, 2015, 114 (10) :1-17

[4]

Ade P. A. R., ARXIV150202114 PLANC

[5] Inflation from superstring and M-theory compactification with higher order corrections. II. Case of quartic Weyl terms [J].

Akune, Kenta ;

Maeda, Kei-ichi ;

Ohta, Nobuyoshi .

PHYSICAL REVIEW D, 2006, 73 (10)

[6] COSMOLOGY FOR GRAND UNIFIED THEORIES WITH RADIATIVELY INDUCED SYMMETRY-BREAKING [J].

ALBRECHT, A ;

STEINHARDT, PJ .

PHYSICAL REVIEW LETTERS, 1982, 48 (17) :1220-1223

[7] Effects of modified gravity on B-mode polarization [J].

Amendola, Luca ;

Ballesteros, Guillermo ;

Pettorino, Valeria .

PHYSICAL REVIEW D, 2014, 90 (04)

[8]

[Anonymous], ARXIV160205431

[9]

[Anonymous], ASTROPART PHYS

[10]

[Anonymous], 2015, J COSMOL ASTROPART P

← 1 2 3 4 5 6 7 →