Planck residuals anomaly as a fingerprint of alternative scenarios to inflation

被引：25

作者：

Domenech, Guillem ^{[1
]}

Chen, Xingang ^{[2
]}

Kamionkowski, Marc ^{[3
]}

Loeb, Abraham ^{[2
]}

机构：

[1] Heidelberg Univ, Inst Theoret Phys, Philosophenweg 16, D-69120 Heidelberg, Germany

[2] Harvard Smithsonian Ctr Astrophys, 60 Garden St, Cambridge, MA 02138 USA

[3] Johns Hopkins Univ, Dept Phys & Astron, 3400 N Charles St, Baltimore, MD 21218 USA

来源：

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS | 2020年 / 10期

基金：

欧盟地平线“2020”;

关键词：

alternatives to inflation; gravitational lensing; inflation; physics of the early universe; UNIVERSE; PERTURBATIONS; FEATURES;

D O I：

10.1088/1475-7516/2020/10/005

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Planck's residuals of the CMB temperature power spectrum present a curious oscillatory shape that resembles an extra smoothing effect of lensing and is the source of the lensing anomaly. The smoothing effect of lensing to the CMB temperature power spectrum is, to some extent, degenerate with oscillatory modulations of the primordial power spectrum, in particular if the frequency is close to that of the acoustic peaks. We consider the possibility that the lensing anomaly reported by the latest Planck 2018 results may be hinting at an oscillatory modulation generated by a massive scalar field during an alternative scenario to inflation or by a sharp feature during inflation. We use the full TTTEEE-low E CMB likelihood from Planck to derive constraints on these two types of models. We obtain that in both cases the A(L) anomaly is mildly reduced to slightly less than 2 sigma, to be compared with the 2.8 sigma deviation from A(L) = 1 in Lambda CDM. Although the oscillatory features are not able to satisfactorily ease the lensing anomaly, we find that the oscillatory modulation generated during an alternative scenario alone, i.e. with A(L) = 1, presents the lowest value of chi(2), with Delta chi(2) = -13 compared to Lambda CDM. Furthermore, the Akaike Information Criterion suggests that such an oscillation constitutes an attractive candidate since it has a value Delta AIC = -5 with respect to Lambda CDM, comparable to the A(L) parameter. We also obtain that the equation of state parameter in the alternative scenario is given at 1 sigma by w = 0.13 +/- 0.17. Interestingly, the matter bounce and radiation bounce scenarios are compatible with our results. We discuss how these models of oscillatory features can be tested with future observations.

引用

页数：29

共 99 条

[1] 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)

[2] Features of heavy physics in the CMB power spectrum [J].

Achucarro, Ana ;

Gong, Jinn-Ouk ;

Hardeman, Sjoerd ;

Palma, Gonzalo A. ;

Patil, Subodh P. .

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS, 2011, (01)

[3] Inflationary perturbations from a potential with a step [J].

Adams, J ;

Cresswell, B ;

Easther, R .

PHYSICAL REVIEW D, 2001, 64 (12) :6

[4] 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

[5] Planck 2013 results. XVI. Cosmological parameters [J].

Ade, P. A. R. ;

Aghanim, N. ;

Armitage-Caplan, C. ;

Arnaud, M. ;

Ashdown, M. ;

Atrio-Barandela, F. ;

Aumont, J. ;

Baccigalupi, C. ;

Banday, A. J. ;

Barreiro, R. B. ;

Bartlett, J. G. ;

Battaner, E. ;

Benabed, K. ;

Benoit, A. ;

Benoit-Levy, A. ;

Bernard, J. -P. ;

Bersanelli, M. ;

Bielewicz, P. ;

Bobin, J. ;

Bock, J. J. ;

Bonaldi, A. ;

Bond, J. R. ;

Borrill, J. ;

Bouchet, F. R. ;

Bridges, M. ;

Bucher, M. ;

Burigana, C. ;

Butler, R. C. ;

Calabrese, E. ;

Cappellini, B. ;

Cardoso, J. -F. ;

Catalano, A. ;

Challinor, A. ;

Chamballu, A. ;

Chary, R. -R. ;

Chen, X. ;

Chiang, H. C. ;

Chiang, L. -Y ;

Christensen, P. R. ;

Church, S. ;

Clements, D. L. ;

Colombi, S. ;

Colombo, L. P. L. ;

Couchot, F. ;

Coulais, A. ;

Crill, B. P. ;

Curto, A. ;

Cuttaia, F. ;

Danese, L. ;

Davies, R. D. .

ASTRONOMY & ASTROPHYSICS, 2014, 571

[6] Non-Gaussianity from step features in the inflationary potential [J].

Adshead, Peter ;

Dvorkin, Cora ;

Hu, Wayne ;

Lim, Eugene A. .

PHYSICAL REVIEW D, 2012, 85 (02)

[7] Planck 2018 results: VI. Cosmological parameters [J].

Aghanim, N. ;

Akrami, Y. ;

Ashdown, M. ;

Aumont, J. ;

Baccigalupi, C. ;

Ballardini, M. ;

Banday, A. J. ;

Barreiro, R. B. ;

Bartolo, N. ;

Basak, S. ;

Battye, R. ;

Benabed, K. ;

Bernard, J. -P. ;

Bersanelli, M. ;

Bielewicz, P. ;

Bock, J. J. ;

Bond, J. R. ;

Borrill, J. ;

Bouchet, F. R. ;

Boulanger, F. ;

Bucher, M. ;

Burigana, C. ;

Butler, R. C. ;

Calabrese, E. ;

Cardoso, J. -F. ;

Carron, J. ;

Challinor, A. ;

Chiang, H. C. ;

Chluba, J. ;

Colombo, L. P. L. ;

Combet, C. ;

Contreras, D. ;

Crill, B. P. ;

Cuttaia, F. ;

de Bernardis, P. ;

de Zotti, G. ;

Delabrouille, J. ;

Delouis, J. -M. ;

Di Valentino, E. ;

Diego, J. M. ;

Dore, O. ;

Douspis, M. ;

Ducout, A. ;

Dupac, X. ;

Dusini, S. ;

Efstathiou, G. ;

Elsner, F. ;

Ensslin, T. A. ;

Eriksen, H. K. ;

Fantaye, Y. .

ASTRONOMY & ASTROPHYSICS, 2020, 641

[8] Planck 2018 results: V. CMB power spectra and likelihoods [J].

Aghanim, N. ;

Akrami, Y. ;

Ashdown, M. ;

Aumont, J. ;

Baccigalupi, C. ;

Ballardini, M. ;

Banday, A. J. ;

Barreiro, R. B. ;

Bartolo, N. ;

Basak, S. ;

Benabed, K. ;

Bernard, J. -P. ;

Bersanelli, M. ;

Bielewicz, P. ;

Bock, J. J. ;

Bond, J. R. ;

Borrill, J. ;

Bouchet, F. R. ;

Boulanger, F. ;

Bucher, M. ;

Burigana, C. ;

Butler, R. C. ;

Calabrese, E. ;

Cardoso, J. -F. ;

Carron, J. ;

Casaponsa, B. ;

Challinor, A. ;

Chiang, H. C. ;

Colombo, L. P. L. ;

Combet, C. ;

Crill, B. P. ;

Cuttaia, F. ;

de Bernardis, P. ;

de Rosa, A. ;

de Zotti, G. ;

Delabrouille, J. ;

Delouis, J. -M. ;

Di Valentino, E. ;

Diego, J. M. ;

Dore, O. ;

Douspis, M. ;

Ducout, A. ;

Dupac, X. ;

Dusini, S. ;

Efstathiou, G. ;

Elsner, F. ;

Ensslin, T. A. ;

Eriksen, H. K. ;

Fantaye, Y. ;

Fernandez-Cobos, R. .

ASTRONOMY & ASTROPHYSICS, 2020, 641

[9]

Aghanim N., 2020, AAP, V641, pA6, DOI DOI 10.1051/0004-6361/201833886

[10] NEW LOOK AT STATISTICAL-MODEL IDENTIFICATION [J].

AKAIKE, H .

IEEE TRANSACTIONS ON AUTOMATIC CONTROL, 1974, AC19 (06) :716-723

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