Search Publications
Halometry from astrometry
Van Tilburg, Ken; Weiner, Neal; Taki, Anna-Maria
Halometry—mapping out the spectrum, location, and kinematics of nonluminous structures inside the Galactic halo—can be realized via variable weak gravitational lensing of the apparent motions of stars and other luminous background sources. Modern astrometric surveys provide unprecedented positional precision along with a leap in the number of cata…
Exploring cosmic origins with CORE: B-mode component separation
Boulanger, F.; Ashdown, M.; Baccigalupi, C. +114 more
We demonstrate that, for the baseline design of the CORE satellite mission, the polarized foregrounds can be controlled at the level required to allow the detection of the primordial cosmic microwave background (CMB) B-mode polarization with the desired accuracy at both reionization and recombination scales, for tensor-to-scalar ratio values of rg…
Relieving the tension between weak lensing and cosmic microwave background with interacting dark matter and dark energy models
Feng, Chang; Wang, Bin; An, Rui
We constrain interacting dark matter and dark energy (IDMDE) models using a 450-degree-square cosmic shear data from the Kilo Degree Survey (KiDS) and the angular power spectra from Planck's latest cosmic microwave background measurements. We revisit the discordance problem in the standard Lambda cold dark matter (ΛCDM) model between weak lensing …
Constraining warm inflation with CMB data
Bhattacharya, Sukannya; Dutta, Koushik; Gangopadhyay, Mayukh Raj +1 more
We confront the warm inflation observational predictions directly with the latest CMB data. We focus on a linear temperature (T) dissipative coefficient combined with the simplest model of inflation, a quartic chaotic potential. Although excluded in its standard cold inflation version, dissipation reduces the tensor-to-scalar ratio and brings the …
Deconstructing the neutrino mass constraint from galaxy redshift surveys
Komatsu, Eiichiro; Boyle, Aoife
The total mass of neutrinos can be constrained in a number of ways using galaxy redshift surveys. Massive neutrinos modify the expansion rate of the Universe, which can be measured using baryon acoustic oscillations (BAOs) or the Alcock-Paczynski (AP) test. Massive neutrinos also change the structure growth rate and the amplitude of the matter pow…
Anatomy of Eddington-like inversion methods in the context of dark matter searches
Lacroix, Thomas; Stref, Martin; Lavalle, Julien
Irrespective of the dark matter (DM) candidate, several potentially observable signatures derive from the velocity distribution of DM in halos, in particular in the Milky Way (MW) halo. Examples include direct searches for weakly-interacting massive particles (WIMPs), p-wave suppressed or Sommerfeld-enhanced annihilation signals, microlensing even…
Exploring cosmic origins with CORE: Gravitational lensing of the CMB
Boulanger, F.; Ashdown, M.; Banday, A. J. +111 more
Lensing of the cosmic microwave background (CMB) is now a well-developed probe of the clustering of the large-scale mass distribution over a broad range of redshifts. By exploiting the non-Gaussian imprints of lensing in the polarization of the CMB, the CORE mission will allow production of a clean map of the lensing deflections over nearly the fu…
Revisiting CMB constraints on warm inflation
Arya, Richa; Dasgupta, Arnab; Goswami, Gaurav +2 more
We revisit the constraints that Planck 2015 temperature, polarization and lensing data impose on the parameters of warm inflation. To this end, we study warm inflation driven by a single scalar field with a quartic self interaction potential in the weak dissipative regime. We analyse the effect of the parameters of warm inflation, namely, the infl…
The metal-poor stellar halo in RAVE-TGAS and its implications for the velocity distribution of dark matter
Lisanti, Mariangela; Herzog-Arbeitman, Jonah; Necib, Lina
The local velocity distribution of dark matter plays an integral role in interpreting the results from direct detection experiments. We previously showed that metal-poor halo stars serve as excellent tracers of the virialized dark matter velocity distribution using a high-resolution hydrodynamic simulation of a Milky Way-like halo. In this paper, …
Fast point spread function modeling with deep learning
Herbel, Jörg; Amara, Adam; Refregier, Alexandre +2 more
Modeling the Point Spread Function (PSF) of wide-field surveys is vital for many astrophysical applications and cosmological probes including weak gravitational lensing. The PSF smears the image of any recorded object and therefore needs to be taken into account when inferring properties of galaxies from astronomical images. In the case of cosmic …