Search Publications
Ultralight scalar dark matter detection with ZAIGA
Wang, Jin; Zhao, Wei; Mei, Xitong +2 more
Zhaoshan long-baseline atom interferometer gravitation antenna (ZAIGA) is a proposed underground long-baseline atom interferometer (AI) facility, aiming for experimental research on gravitation and related problems. In this paper, we study the possibility of detecting the ultralight scalar dark matter (DM) with ZAIGA. According to a popular scalar…
Kinematics of the Milky Way Thick disk in solar neighborhood
Vieira, K.; Korchagin, V.; Lutsenko, A.
Using GAIA EDR3 catalog, we present the detailed analysis of the two-component Milky Way stellar disk in the solar neighborhood. To determine the kinematical properties of the thin and of the Thick disks, we select the complete sample of about 278,000 evolved red giant branch (RGB) stars distributed in the cylinder of 1 kpc radius and 0.5 kpc heig…
Challenging a Newtonian prediction through Gaia wide binaries
Scarpa, R.; Hernandez, X.; Allen, Christine +1 more
Under Newtonian dynamics, the relative motion of the components of a binary star should follow a Keplerian scaling with separation. Once orientation effects and a distribution of ellipticities are accounted for, dynamical evolution can be modeled to include the effects of Galactic tides and stellar mass perturbers, over the lifetime of the solar n…
Observational constraints on Gauss-Bonnet cosmology
Benetti, Micol; Alcaniz, Jailson S.; Capozziello, Salvatore +2 more
We analyze a fully geometric approach to dark energy in the framework of F(R,𝒢) theories of gravity, where R is the Ricci curvature scalar and 𝒢 is the Gauss-Bonnet topological invariant. The latter invariant naturally exhausts, together with R, the whole curvature content related to curvature invariants coming from the Riemann tensor. In particul…
Precursors of short gamma-ray bursts detected by the INTEGRAL observatory
Minaev, Pavel; Pozanenko, Alexei; Molkov, Sergei
We have analyzed the light curves of 527 short gamma-ray bursts (GRBs) registered by the SPI-ACS, SPI and IBIS/ISGRI experiments of INTEGRAL observatory totally to search for precursors. Both the light curves of each 527 individual burst and the averaged light curve of 372 brightest SPI-ACS bursts have been analyzed. In a few cases, we have found …
VHE observations of binary systems performed with the MAGIC telescopes
Torres, Diego F.; Zanin, Roberta; Casares, Jorge +11 more
The improvement on the Imaging Air Cherenkov Technique (IACT) led to the discovery of a new type of sources that can emit at very high energies: the gamma-ray binaries. Only six systems are part of this exclusive class. We summarize the latest results from the observations performed with the MAGIC telescopes on different systems as the gamma-ray b…
Foreground contribution to the inferred cosmological parameters from Planck
Vincent, Aaron C.; Wibig, Tadeusz; Wolfendale, Arnold W.
Previous analyses of cosmic microwave background (CMB) measurements [T. Wibig and A. W. Wolfendale, Mon. Not. R. Astron. Soc. 360 (2005) 236, arXiv:astro-ph/0409397; Mon. Not. R. Astron. Soc. 448 (2015) 1030, arXiv:1507.0677.] have revealed contamination by areas of high cosmic ray activity in the Milky Way. Here, we update studies, looking at the…
LISA Pathfinder first results
Vetrugno, D.
LISA Pathfinder (LPF) is an in-flight technological demonstrator designed and launched to prove the feasibility of sub-femto-g free fall of kilo-sized test masses (TM), an essential ingredient for the future gravitational wave observatory from space. Half a year after launch, the first results are available and show an incredibly well-performing i…
Imaging cosmic polarization rotation
Contaldi, Carlo R.
We introduce a method to isolate the contribution of parity-violating modes to the peak constrained correlation function. This method can be used as a local estimate of polarization rotation. We test this method using simulations and by applying it to Planck maps [P. A. R. Ade et al., arXiv:1502.01589 astro.ph.co]. We obtain a constraint on the mo…
Observational hints of a pre-inflationary scale?
Gruppuso, A.; Sagnotti, A.
We argue that the lack of power exhibited by cosmic microwave background (CMB) anisotropies at large angular scales might be linked to the onset of inflation. We highlight observational features and theoretical hints that support this view, and present a preliminary estimate of the physical scale that would underlie the phenomenon.