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The Cosmic Microwave Background
Joseph Silk
I review the discovery of the temperature fluctuations in the cosmic microwave background radiation. The underlying theory and the implications for cosmology are reviewed, and I de…
Cosmological Constraints from a Combined Analysis of the Cluster Mass Function and Microwave Background Anisotropies
Alessandro Melchiorri, Paul Bode, Neta A. Bahcall +1
We present constraints on several cosmological parameters from a combined analysis of the most recent Cosmic Microwave Background anisotropy data and the Sloan Digital Sky Survey c…
The phase-diagram of the IGM and the entropy floor of groups and clusters: are clusters born warm?
P. Valageas, R. Schaeffer, J. Silk
We point out that two problems of observational cosmology, the facts i) that > 60% of the baryonic content of the universe is not observed at z=0 and ii) that the properties of sma…
A New Prescription for Protogalactic Feedback and Outflows: Where Have All the Baryons Gone?
Joseph Silk
Up to half of the baryons inferred to once have been in our galaxy have not yet been detected. Ejection would seem to provide the most attractive explanation. Previous numerical st…
On breaking the age-metallicity degeneracy in early-type galaxies: infall versus star formation efficiency
I. Ferreras, J. Silk
The correlation between [Mg/Fe] and galaxy mass found in elliptical galaxies sets a strong constraint on the duration of star formation. Furthermore, the colour-magnitude relation…
Formation and Evolution of Disk Galaxies
Joseph Silk
I review several of the current issues in the theory of disk galaxy formation. There is sti ll much to be done, observationally and theoretically, before we can expect to approach…
Non-Standard Structure Formation Scenarios
Alexander Knebe, Brett Little, Ranty Islam +3
Observations on galactic scales seem to be in contradiction with recent high resolution N-body simulations. This so-called cold dark matter (CDM) crisis has been addressed in sever…
Indirect detection of a subdominant density component of cold dark matter
Gintaras Duda, Graciela Gelmini, Paolo Gondolo +2
We examine the detectability through indirect means of weakly interacting dark matter candidates that may constitute not all but only a subdominant component of galactic cold dark…
Can annihilating Dark Matter be lighter than a few GeVs?
C. Boehm, T. A. Ensslin, J. Silk
We estimate the gamma ray fluxes from the residual annihilations of Dark Matter particles having a mass mdm \in [MeV, O(GeV)] and compare them to observations. We find that particl…
Massive black hole remnants of the first stars in galactic haloes
Ranty R. Islam, James E. Taylor, Joseph Silk
We investigate the possibility that present-day galactic haloes contain a population of massive black holes (MBHs) that form by hierarchical merging of the black hole remnants of t…
Type Ia supernovae and the formation history of early-type galaxies
Ignacio Ferreras, Joseph Silk
Using the standard prescription for the rates of supernovae type II and type Ia, we compare the predictions of a simple model of star formation in galaxies with the observed radial…
Feedback Processes in Early-Type Galaxies
Ignacio Ferreras, Evan Scannapieco, Joseph Silk
We present a phenomenological model of feedback in early-type galaxies that tracks the evolution of the interstellar medium gas mass, metallicity, and temperature. Modeling the sta…
Redshift of Galaxy Clusters from the Sunyaev-Zel'dovich effect
J. M Diego, J. Mohr, J. Silk +1
We develop a new method for estimating the redshift of galaxy clusters through resolved images of the Sunyaev-Zel'dovich effect (SZE). Our method is based on morphological observab…
Observing Baryonic Dark Matter with ALMA
Hideyuki Kamaya, Joseph Silk
It has recently been argued that the unidentified SCUBA objects (USOs) are a thick disk population of free-floating dense, compact galactic gas clumps at a temperature of about 7 K…
The Clumpiness of Cold Dark Matter: Implications for the Annihilation Signal
James E. Taylor, Joseph Silk
We examine the expected signal from annihilation events in realistic cold dark matter halos. If the WIMP is a neutralino, with an annihilation cross-section predicted in minimal SU…
The impact of relativistic corrections and component separation in the measurement of the SZ effect and on the small angular scale non-Gaussianity of the CMB
J. M. Diego, S. H. Hansen, J. Silk
We study the effect of imperfect subtraction of the Sunyaev-Zel'dovich effect (SZE) using a robust and non-parametric method to estimate the SZE residual in the Planck channels. We…
A late-time transition in the equation of state versus Lambda-CDM
B. A. Bassett, M. Kunz, J. Silk +1
We study a model of the dark energy which exhibits a rapid change in its equation of state w(z), such as occurs in vacuum metamorphosis. We compare the model predictions with CMB,…
Is the Cosmic Microwave Background Circularly Polarized?
Asantha Cooray, Alessandro Melchiorri, Joseph Silk
The primordial anisotropies of the cosmic microwave background (CMB) are linearly polarized via Compton-scattering. The Faraday conversion process during the propagation of polariz…
Solar Seismic Model as a New Constraint on Supersymmetric Dark Matter
Ilidio Lopes, Gianfranco Bertone, Joseph Silk
If the Milky Way is populated by WIMPs as predicted by cosmological models of the large-scale structure of the universe and as motivated by SUSY, the capture of high-mass WIMPs by…
Cosmology with GTC. A combined mm-optical galaxy cluster survey
J. M. Diego, E. Martinez-Gonzalez, J. L. Sanz +2
The CMB Planck satellite (ESA) will provide a catalogue of nearly 30000 galaxy clusters (Sunyaev-Zel'dovich effect) between redshift 0 and approx. 2-3 (depending on the cosmologica…
The Dynamical Evolution of Substructure
Bing Zhang, Rosemary F. G. Wyse, Massimo Stiavelli +1
The evolution of substructure embedded in non-dissipative dark halos is studied through N-body simulations of isolated systems, both in and out of initial equilibrium, complementin…
A late-time transition in the cosmic dark energy?
Bruce A. Bassett, Martin Kunz, Joseph Silk +1
We study constraints from the latest CMB, large scale structure (2dF, Abell/ACO, PSCz) and SN1a data on dark energy models with a sharp transition in their equation of state, w(z).…