Ruprecht Karls Universität Heidelberg

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joint [2019/03/14 12:06]
manuel [Seminar calendar]
joint [2019/05/23 12:21] (current)
marta
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 ====Seminar calendar==== ====Seminar calendar====
  
 +__**Summer term 19:**__
  
-__**Winter term 18/19:**__+== 25th July 2019Selected topics in theory and observations of Dark Energy (Tunch) ==
  
-== 14th March 2019: Journal Club ==+TBA 
 + 
 +== 18th July 2019: Journal Club ==
  
 TBA TBA
 +
 +== 11th July 2019: Selected topics in theory and observations of Dark Energy (Tunch) ==
 +
 +TBA
 +
 +== 4th July 2019: Journal Club ==
 +
 +TBA
 +
 +== 27th June 2019: Selected topics in theory and observations of Dark Energy (Tunch) ==
 +
 +TBA
 +
 +== 19th June 2019, PW 12, Room 060 (NOTE UNUSUAL DATE AND LOCATION): Journal Club ==
 +
 +TBA
 +
 +== 13th June 2019: Selected topics in theory and observations of Dark Energy (Tunch) ==
 +
 +TBA
 +
 +== 6th June 2019: Journal Club ==
 +
 +TBA
 +
 +== 29th May 2019, PW 12, Room 060 (NOTE UNUSUAL DATE AND LOCATION): Selected topics in theory and observations of Dark Energy (Tunch) ==
 +
 +Oliver Piattella (UFES, Brazil; visitor at ITP, Universität Heidelberg) - TBA
 +
 +== 23rd May 2019: Journal Club ==
 +
 +Adrià Gomez-Valent \\
 +
 +Recasting H0 tension as OmegaM tension at low z \\
 +Eoin Ó Colgáin \\
 +[[https://​arxiv.org/​abs/​1903.11743 | view arXiv ]] \\
 +
 +Leonardo Giani \\
 +
 +Is Gravity Actually the Curvature of Spacetime? \\
 +Sebastian Bahamonde, Mir Faizal \\
 +[[https://​arxiv.org/​abs/​1905.04372 | view arXiv ]]
 +
 +How to Hide a Cosmological Constant \\
 +S. Carlip \\
 +[[https://​arxiv.org/​abs/​1905.05216 | view arXiv ]]
 +
 +
 +== 16th May 2019: Selected topics in theory and observations of Dark Energy (Tunch) ==
 +
 +Luca Amendola (ITP, Universität Heidelberg) - "​Fisher matrix for multiple tracers (1904.00673)"​
 +
 +I show how to obtain constraints on β, the ratio of the matter growth rate and the bias that quantifies the linear redshift-space distortions,​ that are independent of the cosmological model, using multiple tracers of large-scale structure. For a single tracer the uncertainties on β are constrained by the uncertainties in the amplitude and shape of the power spectrum, which is limited by cosmic variance. However, for two or more tracers this limit does not apply, since taking the ratio of power spectra cosmic variance cancels out, and in the linear (Kaiser) approximation one measures directly the quantity (1+β1μ2)2/​(1+β2μ2)2,​ where μ is the angle of a given mode with the line of sight. I provide analytic formulae for the Fisher matrix for one and two tracers (up to quadrature) and quantify the signal-to-noise ratio needed to make effective use of the multiple-tracer technique. I also forecast the errors on β for a survey like Euclid. ​
 +
 +== 9th May 2019: Journal Club ==
 +
 +Xuewen Liu \\
 +
 +21-cm observations and warm dark matter models \\
 +Alexey Boyarsky, Dmytro Iakubovskyi,​ Oleg Ruchayskiy, Anton Rudakovskyi,​ Wessel Valkenburg \\
 +[[https://​arxiv.org/​abs/​1904.03097 | view arXiv ]] \\
 +
 +
 +== 2nd May 2019: Selected topics in theory and observations of Dark Energy (Tunch) ==
 +
 +Ana Marta Pinho (ITP, Universität Heidelberg) - "​Cosmological Information Flow"
 +
 +The current state of Cosmology is a strong statistical preference for the LCDM model although with some unsolved problems. The recent data tensions raise now the doubt about the validity of the data pipeline and/or the LCDM model. Information theory provides some very useful tools that can measure the amount of information given by the data. Also these tools can be related to what it is commonly used in the literature as uncertainty measurements. In this talk I will present this on going work that tries to understand how information flows in the cosmological framework.
 +
 +== 25th April 2019: Journal Club ==
 +
 +Ana Marta Pinho \\
 +
 +Large Magellanic Cloud Cepheid Standards Provide a 1% Foundation for the Determination of the Hubble Constant and Stronger Evidence for Physics Beyond LambdaCDM \\
 +Adam G. Riess, Stefano Casertano, Wenlong Yuan, Lucas M. Macri, Dan Scolnic \\
 +[[https://​arxiv.org/​abs/​1903.07603 | view arXiv ]] \\
 +
 +Manuel Wittner \\
 +
 +Probing modified gravity in cosmic filaments \\
 +Alex Ho, Max Gronke, Bridget Falck, David F. Mota \\
 +[[https://​arxiv.org/​abs/​1807.07287 | view arXiv ]] \\
 +
 +__**Winter term 18/19:**__
  
 == 7th March 2019: Selected topics in theory and observations of Dark Energy (Tunch) == == 7th March 2019: Selected topics in theory and observations of Dark Energy (Tunch) ==

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