相关论文: Bumpy Power Spectra and dT/T

Detectable Data-driven Features in the Primordial Scalar Power Spectrum

In this work we explore the power of future large-scale surveys to constrain possible deviations from the standard single-field slow-roll inflationary scenario. Specifically, we parametrize possible fluctuations around the almost…

宇宙学与河外天体物理 · 物理学 2021-05-14 Muhammad Sadegh Esmaeilian , Marzieh Farhang , Shirin Khodabakhshi

On Minimally-Parametric Primordial Power Spectrum Reconstruction and the Evidence for a Red Tilt

The latest cosmological data seem to indicate a significant deviation from scale invariance of the primordial power spectrum when parameterized either by a power law or by a spectral index with non-zero "running". This deviation, by itself,…

天体物理学 · 物理学 2011-05-12 Licia Verde , Hiranya V. Peiris

Baryon oscillations

The coupling of photons and baryons by Thomson scattering in the early universe imprints features in both the Cosmic Microwave Background (CMB) and matter power spectra. The former have been used to constrain a host of cosmological…

天体物理学 · 物理学 2008-11-26 Martin White

Planck 2018 results. VI. Cosmological parameters

We present cosmological parameter results from the final full-mission Planck measurements of the CMB anisotropies. We find good consistency with the standard spatially-flat 6-parameter $\Lambda$CDM cosmology having a power-law spectrum of…

宇宙学与河外天体物理 · 物理学 2021-08-10 Planck Collaboration , N. Aghanim , Y. Akrami , M. Ashdown , J. Aumont , C. Baccigalupi , M. Ballardini , A. J. Banday , R. B. Barreiro , N. Bartolo , S. Basak , R. Battye , K. Benabed , J. -P. Bernard , M. Bersanelli , P. Bielewicz , J. J. Bock , J. R. Bond , J. Borrill , F. R. Bouchet , F. Boulanger , M. Bucher , C. Burigana , R. C. Butler , E. Calabrese , J. -F. Cardoso , J. Carron , A. Challinor , H. C. Chiang , J. Chluba , L. P. L. Colombo , C. Combet , D. Contreras , B. P. Crill , F. Cuttaia , P. de Bernardis , G. de Zotti , J. Delabrouille , J. -M. Delouis , E. Di Valentino , J. M. Diego , O. Doré , M. Douspis , A. Ducout , X. Dupac , S. Dusini , G. Efstathiou , F. Elsner , T. A. Enßlin , H. K. Eriksen , Y. Fantaye , M. Farhang , J. Fergusson , R. Fernandez-Cobos , F. Finelli , F. Forastieri , M. Frailis , A. A. Fraisse , E. Franceschi , A. Frolov , S. Galeotta , S. Galli , K. Ganga , R. T. Génova-Santos , M. Gerbino , T. Ghosh , J. González-Nuevo , K. M. Górski , S. Gratton , A. Gruppuso , J. E. Gudmundsson , J. Hamann , W. Handley , F. K. Hansen , D. Herranz , S. R. Hildebrandt , E. Hivon , Z. Huang , A. H. Jaffe , W. C. Jones , A. Karakci , E. Keihänen , R. Keskitalo , K. Kiiveri , J. Kim , T. S. Kisner , L. Knox , N. Krachmalnicoff , M. Kunz , H. Kurki-Suonio , G. Lagache , J. -M. Lamarre , A. Lasenby , M. Lattanzi , C. R. Lawrence , M. Le Jeune , P. Lemos , J. Lesgourgues , F. Levrier , A. Lewis , M. Liguori , P. B. Lilje , M. Lilley , V. Lindholm , M. López-Caniego , P. M. Lubin , Y. -Z. Ma , J. F. Macías-Pérez , G. Maggio , D. Maino , N. Mandolesi , A. Mangilli , A. Marcos-Caballero , M. Maris , P. G. Martin , M. Martinelli , E. Martínez-González , S. Matarrese , N. Mauri , J. D. McEwen , P. R. Meinhold , A. Melchiorri , A. Mennella , M. Migliaccio , M. Millea , S. Mitra , M. -A. Miville-Deschênes , D. Molinari , L. Montier , G. Morgante , A. Moss , P. Natoli , H. U. Nørgaard-Nielsen , L. Pagano , D. Paoletti , B. Partridge , G. Patanchon , H. V. Peiris , F. Perrotta , V. Pettorino , F. Piacentini , L. Polastri , G. Polenta , J. -L. Puget , J. P. Rachen , M. Reinecke , M. Remazeilles , A. Renzi , G. Rocha , C. Rosset , G. Roudier , J. A. Rubiño-Martín , B. Ruiz-Granados , L. Salvati , M. Sandri , M. Savelainen , D. Scott , E. P. S. Shellard , C. Sirignano , G. Sirri , L. D. Spencer , R. Sunyaev , A. -S. Suur-Uski , J. A. Tauber , D. Tavagnacco , M. Tenti , L. Toffolatti , M. Tomasi , T. Trombetti , L. Valenziano , J. Valiviita , B. Van Tent , L. Vibert , P. Vielva , F. Villa , N. Vittorio , B. D. Wandelt , I. K. Wehus , M. White , S. D. M. White , A. Zacchei , A. Zonca

Joint Bayesian analysis of large angular scale CMB temperature anomalies

Cosmic microwave background measurements show an agreement with the concordance cosmology model except for a few notable anomalies: Power Suppression, the lack of large scale power in the temperature data compared to what is expected in the…

宇宙学与河外天体物理 · 物理学 2019-08-20 Shabbir Shaikh , Suvodip Mukherjee , Santanu Das , Benjamin D. Wandelt , Tarun Souradeep

VSL theories and the Doppler peak

We discuss constraints on so-called `varying speed of light theories' coming from the physics of the early universe. Specifically, we consider the position of the first acoustic peak of the CMB angular power spectrum, showing that the…

天体物理学 · 物理学 2009-10-31 P. P. Avelino , C. J. A. P. Martins , G. Rocha

Bayesian reconstruction of the inflaton's speed of sound using CMB data

We update the search for features, due to transient reductions in inflaton's speed of sound, in the Cosmic Microwave Background (CMB) angular power spectrum using Planck 2018 temperature, polarization and lensing data. We develop a new…

宇宙学与河外天体物理 · 物理学 2021-06-23 Guadalupe Cañas-Herrera , Jesús Torrado , Ana Achúcarro

Robustness of cosmological axion mass limits

We present cosmological bounds on the thermal axion mass in an extended cosmological scenario in which the primordial power spectrum of scalar perturbations differs from the usual power-law shape predicted by the simplest inflationary…

宇宙学与河外天体物理 · 物理学 2015-06-10 Eleonora Di Valentino , Stefano Gariazzo , Elena Giusarma , Olga Mena

A Measurement of the Cosmic Microwave Background $B$-Mode Polarization Power Spectrum at Sub-Degree Scales from 2 years of POLARBEAR Data

We report an improved measurement of the cosmic microwave background (CMB) $B$-mode polarization power spectrum with the POLARBEAR experiment at 150 GHz. By adding new data collected during the second season of observations (2013-2014) to…

宇宙学与河外天体物理 · 物理学 2017-10-31 The POLARBEAR Collaboration , P. A. R. Ade , M. Aguilar , Y. Akiba , K. Arnold , C. Baccigalupi , D. Barron , D. Beck , F. Bianchini , D. Boettger , J. Borrill , S. Chapman , Y. Chinone , K. Crowley , A. Cukierman , M. Dobbs , A. Ducout , R. Dünner , T. Elleflot , J. Errard , G. Fabbian , S. M. Feeney , C. Feng , T. Fujino , N. Galitzki , A. Gilbert , N. Goeckner-Wald , J. Groh , T. Hamada , G. Hall , N. W. Halverson , M. Hasegawa , M. Hazumi , C. Hill , L. Howe , Y. Inoue , G. C. Jaehnig , A. H. Jaffe , O. Jeong , D. Kaneko , N. Katayama , B. Keating , R. Keskitalo , T. Kisner , N. Krachmalnicoff , A. Kusaka , M. Le Jeune , A. T. Lee , E. M. Leitch , D. Leon , E. Linder , L. Lowry , F. Matsuda , T. Matsumura , Y. Minami , J. Montgomery , M. Navaroli , H. Nishino , H. Paar , J. Peloton , A. T. P. Pham , D. Poletti , G. Puglisi , C. L. Reichardt , P. L. Richards , C. Ross , Y. Segawa , B. D. Sherwin , M. Silva-Feaver , P. Siritanasak , N. Stebor , R. Stompor , A. Suzuki , O. Tajima , S. Takakura , S. Takatori , D. Tanabe , G. P. Teply , T. Tomaru , C. Tucker , N. Whitehorn , A. Zahn

Evidence for a non-zero Lambda and a low matter density from a combined analysis of the 2dF Galaxy Redshift Survey and Cosmic Microwave Background Anisotropies

We perform a joint likelihood analysis of the power spectra of the 2dF Galaxy Redshift Survey (2dFGRS) and the cosmic microwave background (CMB) anisotropies under the assumptions that the initial fluctuations were adiabatic, Gaussian and…

天体物理学 · 物理学 2011-03-10 George Efstathiou , Stephen Moody , John A. Peacock , Will J. Percival , Carlton Baugh , Joss Bland-Hawthorn , Terry Bridges , Russell Cannon , Shaun Cole , Matthew Colless , Chris Collins , Warrick Couch , Gavin Dalton , Roberto De Propis , Simon P. Driver , Richard S. Ellis , Carlos S. Frenk , Karl Glazebrook , Carole Jackson , Ofer Lahav , Ian Lewis , Stuart Lumsden , Steve Maddox , Peder Norberg , Bruce A. Peterson , Will Sutherland , Keith Taylor

Planck 2015 constraints on the non-flat XCDM inflation model

We study Planck 2015 cosmic microwave background (CMB) anisotropy data using the energy density inhomogeneity power spectrum generated by quantum fluctuations during an early epoch of inflation in the non-flat XCDM model. Here dark energy…

宇宙学与河外天体物理 · 物理学 2018-12-19 Junpei Ooba , Bharat Ratra , Naoshi Sugiyama

Direct measurement of the angular power spectrum of cosmic microwave background temperature anisotropies in the WMAP Data

Angular power spectrum of the cosmic microwave background (CMB) temperature anisotropies is one of the most important on characteristics of the Universe such as its geometry and total density. Using flat sky approximation and Fourier…

宇宙学与河外天体物理 · 物理学 2015-05-30 Lung-Yih Chiang , Fei-Fan Chen

Current small-scale CMB constraints to axion-like early dark energy

The SPT-3G 2018 TT/TE/EE cosmic microwave background (CMB) data set (temperature and polarization) is used to place constraints on an axion-like model of early dark energy (EDE). These data do not favor axion-like EDE and place an upper…

宇宙学与河外天体物理 · 物理学 2023-09-08 Tristan L. Smith , Vivian Poulin

Parameter constraints for flat cosmologies from CMB and 2dFGRS power spectra

We constrain flat cosmological models with a joint likelihood analysis of a new compilation of data from the cosmic microwave background (CMB) and from the 2dF Galaxy Redshift Survey (2dFGRS). Fitting the CMB alone yields a known degeneracy…

天体物理学 · 物理学 2011-03-10 Will J. Percival , Will Sutherland , John A. Peacock , Carlton M. Baugh , Joss Bland-Hawthorn , Terry Bridges , Russell Cannon , Shaun Cole , Matthew Colless , Chris Collins , Warrick Couch , Gavin Dalton , Roberto De Propris , Simon P. Driver , George Efstathiou , Richard S. Ellis , Carlos S. Frenk , Karl Glazebrook , Carole Jackson , Ofer Lahav , Ian Lewis , Stuart Lumsden , Steve Maddox , Stephen Moody , Peder Norberg , Bruce A. Peterson , Keith Taylor

A Constraint on Primordial $B$-Modes from the First Flight of the SPIDER Balloon-Borne Telescope

We present the first linear polarization measurements from the 2015 long-duration balloon flight of SPIDER, an experiment designed to map the polarization of the cosmic microwave background (CMB) on degree angular scales. Results from these…

宇宙学与河外天体物理 · 物理学 2021-03-25 SPIDER Collaboration , P. A. R. Ade , M. Amiri , S. J. Benton , A. S. Bergman , R. Bihary , J. J. Bock , J. R. Bond , J. A. Bonetti , S. A. Bryan , H. C. Chiang , C. R. Contaldi , O. Doré , A. J. Duivenvoorden , H. K. Eriksen , M. Farhang , J. P. Filippini , A. A. Fraisse , K. Freese , M. Galloway , A. E. Gambrel , N. N. Gandilo , K. Ganga , R. Gualtieri , J. E. Gudmundsson , M. Halpern , J. Hartley , M. Hasselfield , G. Hilton , W. Holmes , V. V. Hristov , Z. Huang , K. D. Irwin , W. C. Jones , A. Karakci , C. L. Kuo , Z. D. Kermish , J. S. -Y. Leung , S. Li , D. S. Y. Mak , P. V. Mason , K. Megerian , L. Moncelsi , T. A. Morford , J. M. Nagy , C. B. Netterfield , M. Nolta , R. O'Brient , B. Osherson , I. L. Padilla , B. Racine , A. S. Rahlin , C. Reintsema , J. E. Ruhl , M. C. Runyan , T. M. Ruud , J. A. Shariff , E. C. Shaw , C. Shiu , J. D. Soler , X. Song , A. Trangsrud , C. Tucker , R. S. Tucker , A. D. Turner , J. F. van der List , A. C. Weber , I. K. Wehus , S. Wen , D. V. Wiebe , E. Y. Young

WMAP constraints on inflationary models with global defects

We use the cosmic microwave background angular power spectra to place upper limits on the degree to which global defects may have aided cosmic structure formation. We explore this under the inflationary paradigm, but with the addition of…

天体物理学 · 物理学 2009-11-10 Neil Bevis , Mark Hindmarsh , Martin Kunz

Measuring the Hubble constant and spatial curvature from supernova apparent magnitude, baryon acoustic oscillation, and Hubble parameter data

Cosmic microwave background (CMB) anisotropy (spatial inhomogeneity) data provide the tightest constraints on the Hubble constant, matter density, spatial curvature, and dark energy dynamics. Other data, sensitive to the evolution of only…

宇宙学与河外天体物理 · 物理学 2019-09-04 Chan-Gyung Park , Bharat Ratra

Cosmology and the Bispectrum

The present spatial distribution of galaxies in the Universe is non-Gaussian, with 40% skewness in 50 Mpc/h spheres, and remarkably little is known about the information encoded in it about cosmological parameters beyond the power spectrum.…

天体物理学 · 物理学 2008-11-26 Emiliano Sefusatti , Martin Crocce , Sebastian Pueblas , Roman Scoccimarro

Reconstruction of initial Asymptotic-de Sitter mode in light of the Planck data

The recently relased \emph{Planck} data, emphasize that the background geometry of inflation is not pure de Sitter, but from the slow variation of Hubble parameter during the inflationary era, it can be quasi-de Sitter. This motivates us to…

宇宙学与河外天体物理 · 物理学 2018-04-09 Hossein Moshafi , Ata Sojasi , Ebrahim Yusofi , Majid Mohsenzadeh

Robust predictions for an oscillatory bispectrum in Planck 2015 data from transient reductions in the speed of sound of the inflaton

We update the search for features in the Cosmic Microwave Background (CMB) power spectrum due to transient reductions in the speed of sound, using Planck 2015 CMB temperature and polarisation data. We enlarge the parameter space to much…

宇宙学与河外天体物理 · 物理学 2017-10-25 Jesus Torrado , Bin Hu , Ana Achucarro