Search Publications
Constraining light scalar field with torsion-balance gravity experiments
Qin, Cheng-Gang; Lu, Xiao-Yu; Zhao, Bing-Chen +5 more
The light scalar field with a coupling to standard model particles provide a possible source of the long-range Yukawa forces or violation of the weak equivalence principle, which can be potentially explored by precision gravity experiments. We describe the searches for such light scalar fields with the three types of gravity experiments, including…
Uncertainties in the Galactic Dark Matter distribution: An update
Iocco, Fabio; Benito, María; Cuoco, Alessandro
We present here a quantitative estimate of the impact of uncertainties of astrophysical nature on the determination of the dark matter distribution within our Galaxy, the Milky Way. Based on an update of a previous analysis, this work is motivated by recent new determinations of astrophysical quantities of relevance - such as the Galactic paramete…
Yet another test of Radial Acceleration Relation for galaxy clusters
Desai, Shantanu; Pradyumna, S.; Gupta, Sajal +1 more
We carry out a test of the radial acceleration relation (RAR) for galaxy clusters from two different catalogs compiled in literature, as an independent cross-check of two recent analyses, which reached opposite conclusions. The datasets we considered include a Chandra sample of 12 clusters and the X-COP sample of 12 clusters. For both the samples,…
Implications of triangular features in the Gaia skymap for the Caustic Ring Model of the Milky Way halo
Gonzalez, Anthony H.; Chakrabarty, Sankha S.; Sikivie, Pierre +1 more
The Gaia map of the Milky Way reveals a pair of triangular features at nearly symmetric locations on opposite sides of the Galactic Center. In this paper we explore the implications of these features assuming they are manifestations of a caustic ring in the dark matter distribution of the Milky Way halo. The existence of a series of such rings is …
Response to a comment on Dessert et al. "The dark matter interpretation of the 3.5 keV line is inconsistent with blank-sky observations"
Safdi, Benjamin R.; Dessert, Christopher; Rodd, Nicholas L.
The dark matter explanation of the 3.5 keV line is strongly disfavored by our work in Dessert et al. (2020). Boyarsky et al. (2004) questions that conclusion: modeling additional background lines is claimed to weaken the limit sufficiently to re-allow a dark matter interpretation. We respond as follows. (1) A more conservative limit is obtained by…
The evens and odds of CMB anomalies
Gruppuso, A.; Lattanzi, M.; Mandolesi, N. +3 more
The lack of power of large-angle CMB anisotropies is known to increase its statistical significance at higher Galactic latitudes, where a string-inspired pre-inflationary scale Δ can also be detected. Considering the Planck 2015 data, and relying largely on a Bayesian approach, we show that the effect is mostly driven by the even - ℓ harmonic mult…
New limits on coupled dark energy model after Planck 2015
Yang, Weiqiang; Wu, Yabo; Li, Hang +1 more
We used the Planck 2015 cosmic microwave background anisotropy, baryon acoustic oscillation, type-Ia supernovae, redshift-space distortions, and weak gravitational lensing to test the model parameter space of coupled dark energy. We assumed the constant and time-varying equation of state parameter for dark energy, and treated dark matter and dark …
An analytical approach to the CMB polarization in a spatially closed background
Niazy, Pedram; Abbassi, Amir H.
The scalar mode polarization of the cosmic microwave background is derived in a spatially closed universe from the Boltzmann equation using the line of sight integral method. The EE and TE multipole coefficients have been extracted analytically by considering some tolerable approximations such as considering the evolution of perturbation hydrodyna…
Linear and non-linear Modified Gravity forecasts with future surveys
Kunz, Martin; Pettorino, Valeria; Martinelli, Matteo +1 more
Modified Gravity theories generally affect the Poisson equation and the gravitational slip in an observable way, that can be parameterized by two generic functions (η and µ) of time and space. We bin their time dependence in redshift and present forecasts on each bin for future surveys like Euclid. We consider both Galaxy Clustering and Weak…
Primordial power spectrum features in phenomenological descriptions of inflation
Mena, Olga; Boubekeur, Lotfi; Gariazzo, Stefano +1 more
We extend an alternative, phenomenological approach to inflation by means of an equation of state and a sound speed, both of them functions of the number of e-folds and four phenomenological parameters. This approach captures a number of possible inflationary models, including those with non-canonical kinetic terms or scale-dependent non-gaussiani…