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Planck constraints on inflation in auxiliary vector modified f (R ) theories
Tsujikawa, Shinji; Ozkan, Mehmet; Pang, Yi
We show that the universal α -attractor models of inflation can be realized by including an auxiliary vector field Aµ for the Starobinsky model with the Lagrangian f (R )=R +R2/(6 M2) . If the same procedure is applied to general modified f (R ) theories in which the Ricci scalar R is replaced by R +A&mi…
Laboratory Studies Towards Understanding Comets
Hartogh, Paul; Marboeuf, Ulysse; Mousis, Olivier +13 more
This review presents some of the recent advancements in our understanding of comets facilitated by laboratory studies, need for new laboratory simulations, and predictions for future explorations. With the spacecraft Rosetta at the comet 67P/Churyumov-Gerasimenko, a large volume of science data is expected to follow early results that have been pu…
Joint Planck and WMAP assessment of low CMB multipoles
Souradeep, Tarun; Prasad, Jayanti; Iqbal, Asif +1 more
The remarkable progress in cosmic microwave background (CMB) studies over past decade has led to the era of precision cosmology in striking agreement with the ΛCDM model. However, the lack of power in the CMB temperature anisotropies at large angular scales (low-ℓ), as has been confirmed by the recent Planck data also (up to 0ℓ=4), although statis…
A Correlation between Lyα Spectral Line Profile and Rest-frame UV Morphology
Dickinson, Mark; Mobasher, Bahram; Hemmati, Shoubaneh +6 more
We explore the relationship between the spectral shape of the Lyα emission and the UV morphology of the host galaxy using a sample of 304 Lyα-emitting BVi-dropouts at 3 < z < 7 in the Great Observatories Origins Deep Survey and Cosmic Evolution Survey fields. Using our extensive reservoir of high-quality Keck DEIMOS spectra combined with Hub…
An X-ray variable absorber within the broad line region in Fairall 51
Guainazzi, M.; Piconcelli, E.; Wilms, J. +3 more
Context. Fairall 51 is a polar-scattered Seyfert 1 galaxy, a type of active galaxy believed to represent a bridge between unobscured type-1 and obscured type-2 objects. Fairall 51 has shown complex and variable X-ray absorption, but little is known about its origin.
Aims: In our research, we observed Fairall 51 with the X-ray satellite Suzaku…
Geologic evolution of the eastern Eridania basin: Implications for aqueous processes in the southern highlands of Mars
Le Deit, Laetitia; Hauber, Ernst; Jaumann, Ralf +1 more
The Terra Sirenum region of Mars is thought to have hosted the Eridania paleolake during the Late Noachian/Early Hesperian, and it offers an insight into the regional aqueous history of Mars. We focus on four basins, including Atlantis, Simois, Caralis, and an unnamed basin. They are hypothesized to have hosted isolated lakes after the drainage of…
Philae localization from CONSERT/Rosetta measurement
Kofman, Wlodek; Herique, Alain; Rogez, Yves +3 more
On 12 November 2014 at 15:34 UTC, after a 7-h descent, the Philae lander made contact with the surface of the comet Churyumov-Gerasimenko (67P/CG) in the centre of the intended landing zone. Following the failure of its anchoring systems, it bounced and continued to fly ballistically. A couple of hours later, telemetry transmitted to Rosetta showe…
Kinetically modified nonminimal chaotic inflation
Pallis, Constantinos
We consider supersymmetric (SUSY) and non-SUSY models of chaotic inflation based on the ϕn potential with 2 ≤n ≤6 . We show that the coexistence of a nonminimal coupling to gravity fR=1 +cRϕn /2 with a kinetic mixing of the form fK=cKfRm can accommodate inflati…
The XMM-Newton survey in the H-ATLAS field
Georgakakis, A.; Vignali, C.; Gilli, R. +8 more
Wide-area X-ray and far-infrared surveys are a fundamental tool to investigate the link between AGN growth and star formation, especially in the low-redshift universe (z ≲ 1). The Herschel Terahertz Large Area survey (H-ATLAS) has covered 550 deg2 in five far-infrared and sub-mm bands, 16 deg2 of which have been presented in …
Evidence of the Dynamics of Relativistic Jet Launching in Quasars
Punsly, Brian
Hubble Space Telescope (HST) spectra of the EUV, the optically thick emission from the innermost accretion flow onto the central supermassive black hole, indicate that radio loud quasars (RLQs) tend to be EUV weak compared to the radio-quiet quasars; yet the remainder of the optically thick thermal continuum is indistinguishable. The deficit of EU…