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CERN Document Server	6 のレコードが見つかりました。	検索にかかった時間： 0.77 秒

Extended Analysis of Neutrino-Dark Matter Interactions with Small-Scale CMB Experiments / Brax, Philippe (IPhT, Saclay ; CERN) ; van de Bruck, Carsten (Sheffield U.) ; Di Valentino, Eleonora (Sheffield U.) ; Giarè, William (Sheffield U.) ; Trojanowski, Sebastian (Warsaw, Copernicus Astron. Ctr. ; NCBJ, Warsaw)
We explore an extension of the standard $\Lambda$CDM model by including an interaction between neutrinos and dark matter, and making use of the ground based telescope data of the Cosmic Microwave Background (CMB) from the Atacama Cosmology Telescope (ACT). An indication for a non-zero coupling between dark matter and neutrinos (both assuming a temperature independent and $T^2$ dependent cross-section) is obtained at the 1$\sigma$ level coming from the ACT CMB data alone and when combined with the Planck CMB and Baryon Acoustic Oscillations (BAO) measurements. [...]
arXiv:2305.01383.- 2023-08-30 - 14 p. - Published in : Phys. Dark Univ. 42 (2023) 101321 Fulltext: Publication - PDF; 2305.01383 - PDF;

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New insights on $\nu$-DM Interactions / Brax, Philippe (IPhT, Saclay ; CERN) ; van de Bruck, Carsten (CERN) ; Di Valentino, Eleonora (CERN) ; Giarè, William (CERN) ; Trojanowski, Sebastian (Warsaw, Copernicus Astron. Ctr. ; NCBJ, Warsaw)
We revisit the possibility of using cosmological observations to constrain models that involve interactions between neutrinos and dark matter. We show that small-scale measurements of the cosmic microwave background with a few per cent accuracy are critical to uncover unique signatures from models with tiny couplings that would require a much higher sensitivity at lower multipoles, such as those probed by the Planck satellite. [...]
arXiv:2303.16895.- 2023-10-04 - 5 p. - Published in : Mon. Not. R. Astron. Soc. 527 (2023) L122-L126 Fulltext: document - PDF; Publication - PDF; 2303.16895 - PDF;

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Chameleons with Field Dependent Couplings / Brax, Philippe ; van de Bruck, Carsten ; Mota, David F ; Nunes, Nelson J ; Winther, Hans A
Certain scalar-tensor theories exhibit the so-called chameleon mechanism, whereby observational signatures of scalar fields are hidden by a combination of self-interactions and interactions with ambient matter. Not all scalar-tensor theories exhibit such a chameleon mechanism, which has been originally found in models with inverse power run-away potentials and field independent couplings to matter. [...]
arXiv:1006.2796.- 2010 - 17 p. - Published in : Phys. Rev. D 82 (2010) 083503 External link: Preprint

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The Dilaton and Modified Gravity / Brax, Philippe ; van de Bruck, Carsten ; Davis, Anne-Christine ; Shaw, Douglas J
We consider the dilaton in the strong string coupling limit and elaborate on the original idea of Damour and Polyakov whereby the dilaton coupling to matter has a minimum with a vanishing value at finite field-value. Combining this type of coupling with an exponential potential, the effective potential of the dilaton becomes matter density dependent. [...]
arXiv:1005.3735.- 2010 - 14 p. - Published in : Phys. Rev. D 82 (2010) 063519 External link: Preprint

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Modifying Gravity at Low Redshift / Brax, Philippe ; van de Bruck, Carsten ; Davis, Anne-Christine ; Shaw, Douglas
We consider the growth of cosmological perturbations in modified gravity models where a scalar field mediates a non-universal Yukawa force between different matter species. The growth of the density contrast is altered for scales below the Compton wave-length of the scalar field. [...]
arXiv:0912.0462.- 2010 - 27 p. - Published in : JCAP 04 (2010) 032 External link: Preprint

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Brane-World Cosmology, Bulk Scalars and Perturbations / Brax, Philippe (CERN) ; van de Bruck, Carsten (Cambridge U., DAMTP) ; Davis, Anne C. (Cambridge U., DAMTP)
We investigate aspects of cosmology in brane world theories with a bulk scalar field. We concentrate on a recent model motivated from supergravity in singular spaces. [...]
hep-th/0108215; CERN-TH-2001-225; DAMTP-2001-51; CERN-TH-2001-225; DAMTP-2001-51; SACLAY-SPHT-T-2001-168.- Geneva : CERN, 2001 - 28 p. - Published in : JHEP 10 (2001) 026 Access to fulltext document: PDF; Fulltext: PDF; SISSA/IOP Published version, local copy: PDF; External link: Preprint

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