Grants related:
General
The Cosmic Microwave Background (CMB) contains the statistical information about the early seeds of the structure formation in our Universe. Its natural counterpart in the local universe is the distribution of galaxies that arises as a result of gravitational growth of those primordial and small density fluctuations. The characterization of the distribution of inhomogeneities at large-scale in the local Universe provides a powerful tool, complementary to the CMB, to determine the origin and the energy content of the Universe, the expansion rate of the Universe during the cosmic history, and the detailed process of formation of the large-scale structures (LSS). The study of the LSS in the coming years will attempt to address the following open questions in cosmology:
What is the dark matter, and which is its detailed contribution to the energy content of the Universe?
What is the dark energy, and how it affects the dynamics of the Universe?
What is the connection between large scale structure and galaxy formation?
Do fundamental constants vary along the history of the Universe?
Is there evidence for primordial non-Gaussianities giving information on the details of the inflationary expansion epoch of the Universe?
In order to contribute to the possible answer to those questions, in this project we will use several large scale structure probes:
The distribution and large-scale clustering of the galaxies, and its evolution with time. The matter power spectrum (P(k)) and the two-point correlation function (ξ(r)) contain certain geometric features associated to some characteristic length-scales in the Universe, as the horizon at matter-radiation equality, or the acoustic horizon at last scattering. In particular, the latter determines the Baryon Acoustic Oscillation (BAO) scale.
The higher order statistics: the three-point statistics characterizes the deviation from Gaussinity and therefore the structure formation through gravitational instability, the galaxy bias, and the primordial non-Gaussianities.
The distribution of the cosmic voids in the Universe. Both the statistics of big voids, as well as the characterization of the void expansion, provides a complementary tool to determine the matter density and the equation of state of the dark energy. Cosmic voids contain information of the higher order statistics of galaxies and can be used to further constrain the BAO scale.
The cosmic web can be used to characterize the formation of structures and relate the large scale structure with galaxy formation processes.
The distribution and abundance of galaxy clusters, as well as the evolution with time. Among other parameters, the cluster mass function depends both on the matter density as well as in the amplitude of the power spectrum. The time evolution of the mass function n(M,z) is also govern by the growth of structures in the Universe, thus being also sensitive to the equation of state of the dark energy.
Members
Results
- eBOSS: cosmological analysis from the quasar sample. Marcos Pellejero Ibañez and F. S. Kitaura participated in the construction of the likelihood and the cosmological parameter estimation (including as coauthors Kitaura & Pellejero Ibañez: 2018MNRAS.473.4773A).
- EUCLID: comparison project of mock galaxy catalogue generating codes showing the accuracy and speed of the PATCHY code (including as coauthors Balaguera-Antolínez, Kitaura & Pellejero Ibañez:https://arxiv.org/abs/1806.09497, https://arxiv.org/abs/1806.09477, https://arxiv.org/abs/1806.09499)
- Development of an accurate Bias mapping method for large scale structure analysis (Balaguera-Antolínez, Kitaura, Pellejero Ibañez et al 2018:https://arxiv.org/abs/1806.05870)
- Presentation of the UNITSIM project to provide simulations for the theoretical model comparison for DESI and EUCLID (including as coauthors Kitaura & Pellejero Ibañez:http://www.unitsims.org/ https://arxiv.org/abs/1811.02111)
- Presentation of BARCODE (Bos, Kitaura & Weygaert 2018: https://arxiv.org/abs/1810.05189, http://adsabs.harvard.edu/abs/2018ascl.soft10002B)
Scientific activity
Related publications
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Cosmological implications of baryon acoustic oscillation measurements
We derive constraints on cosmological parameters and tests of dark energy models from the combination of baryon acoustic oscillation (BAO) measurements with cosmic microwave background (CMB) data and a recent reanalysis of Type Ia supernova (SN) data. In particular, we take advantage of high-precision BAO measurements from galaxy clustering and the
Gontcho, Satya Gontcho A. et al.Advertised on:
122015 -
Evidence of the Missing Baryons from the Kinematic Sunyaev-Zeldovich Effect in Planck Data
We estimate the amount of the missing baryons detected by the Planck measurements of the cosmic microwave background in the direction of central galaxies (CGs) identified in the Sloan galaxy survey. The peculiar motion of the gas inside and around the CGs unveils values of the Thomson optical depth τT in the range 0.2 - 2 ×1 0-4 , indicating that
Hernández-Monteagudo, C. et al.Advertised on:
112015 -
Planck intermediate results. XXVI. Optical identification and redshifts of Planck clusters with the RTT150 telescope
We present the results of approximately three years of observations of Planck Sunyaev-Zeldovich (SZ) sources with the Russian-Turkish 1.5 m telescope (RTT150), as a part of the optical follow-up programme undertaken by the Planck collaboration. During this time period approximately 20% of all dark and grey clear time available at the telescope was
Planck Collaboration et al.Advertised on:
102015 -
The Eleventh and Twelfth Data Releases of the Sloan Digital Sky Survey: Final Data from SDSS-III
The third generation of the Sloan Digital Sky Survey (SDSS-III) took data from 2008 to 2014 using the original SDSS wide-field imager, the original and an upgraded multi-object fiber-fed optical spectrograph, a new near-infrared high-resolution spectrograph, and a novel optical interferometer. All of the data from SDSS-III are now made public. In
Alam, S. et al.Advertised on:
72015 -
Comparison of Sunyaev-Zel'dovich measurements from Planck and from the Arcminute Microkelvin Imager for 99 galaxy clusters
We present observations and analysis of a sample of 123 galaxy clusters from the 2013 Planck catalogue of Sunyaev-Zel'dovich sources with the Arcminute Microkelvin Imager (AMI), a ground-based radio interferometer. AMI provides an independent measurement with higher angular resolution, 3 arcmin compared to the Planck beams of 5-10 arcmin. The AMI
Perrott, Y. C. et al.Advertised on:
82015 -
Constraining the Redshift Evolution of the Cosmic Microwave Background Blackbody Temperature with PLANCK Data.
We constrain the deviation of adiabatic evolution of the universe using the data on the cosmic microwave background (CMB) temperature anisotropies measured by the Planck satellite and a sample of 481 X-ray selected clusters with spectroscopically measured redshifts. To avoid antenna beam effects, we bring all of the maps to the same resolution. We
de Martino, I. et al.Advertised on:
82015 -
Planck 2013 results. XXXII. The updated Planck catalogue of Sunyaev-Zeldovich sources
We update the all-sky Planck catalogue of 1227 clusters and cluster candidates (PSZ1) published in March 2013, derived from detections of the Sunyaev-Zeldovich (SZ) effect using the first 15.5 months of Planck satellite observations. As an addendum, we deliver an updated version of the PSZ1 catalogue, reporting the further confirmation of 86 Planck
Planck Collaboration et al.Advertised on:
92015 -
Constraining the evolution of the CMB temperature with SZ measurements from Planck data
The CMB temperature-redshift relation, TCMB(z)=T0(1+z), is a key prediction of the standard cosmology but is violated in many non-standard models. Constraining possible deviations from this law is an effective way to test the ΛCDM paradigm and to search for hints of new physics. We have determined TCMB(z), with a precision up to 3%, for a subsample
Luzzi, G. et al.Advertised on:
92015 -
Constraint on the time variation of the fine-structure constant with the SDSS-III/BOSS DR12 quasar sample
From the Sloan Digital Sky Survey (SDSS) Data Release 12, which covers the full Baryonic Oscillation Spectroscopic Survey (BOSS) footprint, we investigate the possible variation of the fine-structure constant over cosmological time-scales. We analyse the largest quasar sample considered so far in the literature, which contains 13 175 spectra (10
Albareti, F. D. et al.Advertised on:
102015 -
Constraining the Baryon Fraction in the Warm Hot Intergalactic Medium at Low Redshifts with Planck Data
We cross-correlate foreground cleaned Planck Nominal cosmic microwave background (CMB) maps with two templates constructed from the Two-Micron All-Sky Redshift Survey of galaxies. The first template traces the large-scale filamentary distribution characteristic of the Warm–Hot Intergalactic Medium (WHIM) out to ∼ 90 {{h}-1} Mpc. The second
Génova-Santos, R. et al.Advertised on:
62015 -
Planck 2013 results. I. Overview of products and scientific results
The European Space Agency’s Planck satellite, dedicated to studying the early Universe and its subsequent evolution, was launched 14 May 2009 and has been scanning the microwave and submillimetre sky continuously since 12 August 2009. In March 2013, ESA and the Planck Collaboration released the initial cosmology products based on the first 15.5
Planck Collaboration et al.Advertised on:
112014 -
Planck 2013 results. XIX. The integrated Sachs-Wolfe effect
Based on cosmic microwave background (CMB) maps from the 2013 Planck Mission data release, this paper presents the detection of the integrated Sachs-Wolfe (ISW) effect, that is, the correlation between the CMB and large-scale evolving gravitational potentials. The significance of detection ranges from 2 to 4σ, depending on which method is used. We
Planck Collaboration et al.Advertised on:
112014 -
Planck 2013 results. XX. Cosmology from Sunyaev–Zeldovich cluster counts
We present constraints on cosmological parameters using number counts as a function of redshift for a sub-sample of 189 galaxy clusters from the Planck SZ (PSZ) catalogue. The PSZ is selected through the signature of the Sunyaev-Zeldovich (SZ) effect, and the sub-sample used here has a signal-to-noise threshold of seven, with each object confirmed
Planck Collaboration et al.Advertised on:
112014 -
Planck 2013 results. XXI. Power spectrum and high-order statistics of the Planck all-sky Compton parameter map
We have constructed the first all-sky map of the thermal Sunyaev-Zeldovich (tSZ) effect by applying specifically tailored component separation algorithms to the 100 to 857 GHz frequency channel maps from the Planck survey. This map shows an obvious galaxy cluster tSZ signal that is well matched with blindly detected clusters in the Planck SZ
Planck Collaboration et al.Advertised on:
112014 -
Planck 2013 results. XXIX. The Planck catalogue of Sunyaev-Zeldovich sources
We describe the all-sky Planck catalogue of clusters and cluster candidates derived from Sunyaev-Zeldovich (SZ) effect detections using the first 15.5 months of Planck satellite observations. The catalogue contains 1227 entries, making it over six times the size of the Planck Early SZ (ESZ) sample and the largest SZ-selected catalogue to date. It
Planck Collaboration et al.Advertised on:
112014 -
Tracing a high redshift cosmic web with quasar systems
Context. To understand the formation, evolution, and present-day properties of the cosmic web we need to study it at low and high redshifts. Aims: We trace the cosmic web at redshifts that range from 1.0 ≤ z ≤ 1.8 by using the quasar (QSO) data from the SDSS DR7 QSO catalogue. Methods: We apply a friend-of-friend algorithm to the quasar and random
Einasto, M. et al.Advertised on:
82014 -
The structure of Abell 1351: a bimodal galaxy cluster with peculiar diffuse radio emission
We aim to review the internal structure and dynamics of the Abell 1351 cluster, shown to host a radio halo with a quite irregular shape. Our analysis is based on radial velocity data for 135 galaxies obtained at the Telescopio Nazionale Galileo. We combine galaxy velocities and positions to select 95 cluster galaxy members and analyse the internal
Barrena, R. et al.Advertised on:
82014 -
The clustering of galaxies in the SDSS-III Baryon Oscillation Spectroscopic Survey: baryon acoustic oscillations in the Data Releases 10 and 11 Galaxy samples
We present a one per cent measurement of the cosmic distance scale from the detections of the baryon acoustic oscillations (BAO) in the clustering of galaxies from the Baryon Oscillation Spectroscopic Survey, which is part of the Sloan Digital Sky Survey III. Our results come from the Data Release 11 (DR11) sample, containing nearly one million
Anderson, L. et al.Advertised on:
62014 -
Non-standard models and the sociology of cosmology
I review some theoretical ideas in cosmology different from the standard "Big Bang": the quasi-steady state model, the plasma cosmology model, non-cosmological redshifts, alternatives to non-baryonic dark matter and/or dark energy, and others. Cosmologists do not usually work within the framework of alternative cosmologies because they feel that
López-Corredoira, M.Advertised on:
52014 -
Characterizing unknown systematics in large scale structure surveys
Photometric large scale structure (LSS) surveys probe the largest volumes in the Universe, but are inevitably limited by systematic uncertainties. Imperfect photometric calibration leads to biases in our measurements of the density fields of LSS tracers such as galaxies and quasars, and as a result in cosmological parameter estimation. Earlier
Agarwal, N. et al.Advertised on:
42014
Related talks
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XXXIII Canary Islands Winter School of Astrophysics: Astroparticle Physics and CosmologyThe XXXIII Canary Islands Winter School of Astrophysics, organized by the Instituto de Astrofísica de Canarias (IAC), focuses on Astroparticle Physics and Cosmology. The school, to be held in San
"Salón de actos" at the Museo de la Ciencia y el Cosmos (MCC) Avda. Los Menceyes 70 38205 San Cristóbal de La LagunaSpainDate-Past
