Ruprecht Karls Universität Heidelberg

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joint [2019/01/14 11:18]
manuel
joint [2019/03/14 12:06] (current)
manuel [Seminar calendar]
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-Go to the calendar of [[seminar|Cosmology seminars]] **(Normally ​on Tuesday, 11am, Phil 16)**+Go to the calendar of [[seminar|Cosmology seminars]] **(Usually ​on Tuesday, 11am, Phil 16)**
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 == 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) ==
  
-Xuewen Liu (Institute of Theoretical Physics, CAS, Peking) - TBA+Collective Discussions
  
 == 28th February 2019: Journal Club == == 28th February 2019: Journal Club ==
  
-TBA+Jiaming Zhao \\ 
 + 
 +The local and distant Universe: stellar ages and $H_0$ \\  
 +Raul Jimenez, Andrea Cimatti, Licia Verde, Michele Moresco, Benjamin Wandelt \\ 
 +ePrint: arXiv: 1902.07081 \\ 
 + 
 +Ana Marta Pinho \\ 
 + 
 +The observable $E_g$ statistics \\ 
 +Basundhara Ghosh, Ruth Durrer \\ 
 +ePrint: arXiv: 1812.09546 \\ 
  
 == 21st February 2019: Selected topics in theory and observations of Dark Energy (Tunch) == == 21st February 2019: Selected topics in theory and observations of Dark Energy (Tunch) ==
  
-Stefano Savastano ​(University of Bologna) - TBA+Ana Marta Pinho & Manuel Wittner ​(ITP, Universität Heidelberg) - "​Cosmology,​ philosophically speaking"​ (Collective Discussions)
  
 +As researchers we tend to find answers using the scientific method. However, some questions may not have an answer but still spark a lot of different thoughts and perspectives. In this tunch, we will address some of these questions, from infinity to the beginning of the universe as well as the anthropic principle or the nature of time and space.
  
 == 14th February 2019: Journal Club == == 14th February 2019: Journal Club ==
  
-TBA+Julius Wons \\ 
 + 
 +Using a black hole to weigh light: can the Event Horizon Telescope yield new information about the photon rest mass? \\ 
 +Robert P. Cameron \\ 
 +ePrint: arxiv 1902.02209 \\ 
 + 
 +Jiaming Zhao \\ 
 + 
 +Cosmological constrains from the Hubble diagram of quasars at high redshifts \\ 
 +Guido Risaliti and Elizabeta Lusso \\ 
 +ePrint: arXiv: 1811.02590 \\ 
 + 
 +Oliver Piattella \\ 
 + 
 +On the cosmological problem \\ 
 +Lucas Lombrasier \\ 
 +ePrint: arXiv: 1901.08588 \\ 
  
 == 7th February 2019: Selected topics in theory and observations of Dark Energy (Tunch) == == 7th February 2019: Selected topics in theory and observations of Dark Energy (Tunch) ==
  
-Ana Marta Pinho (ITP, Universität Heidelberg) - TBA+Manuel Wittner ​(ITP, Universität Heidelberg) - "​Introduction to flux compactifications and moduli stabilization"​ 
 + 
 +Kaluza-Klein compactifications are the bridge between 10D string theory and our 4D world. Through the large number of possibilities of this compactified internal space, a vast landscape of string vacua arises, one of which might represent our Universe. In this talk I will introduce basic knowledge about flux compactifications and the stabilization of moduli, which are necessary steps in order to obtain realistic 4D models.
  
  
 == 31st January 2019: Journal Club == == 31st January 2019: Journal Club ==
  
-TBA+Ana Marta Pinho \\ 
 + 
 +Could Solar Radiation Pressure Explain '​Oumuamua'​s Peculiar Acceleration?​ \\ 
 +Shmuel Bialy, Abraham Loeb \\ 
 +ePrint: arXiv: 1810.11490 \\ 
 + 
 +Xuewen Liu \\ 
 + 
 +On the road to per-cent accuracy: nonlinear reaction of the matter power spectrum to dark energy and modified gravity \\ 
 +Matteo Cataneo, Lucas Lombriser, Catherine Heymans, Alexander Mead, Alexandre Barreira, Sownak Bose, Baojiu Li \\ 
 +ePrint: arXiv: 1812.05594 \\
  
 == 24th January 2019: Selected topics in theory and observations of Dark Energy (Tunch) == == 24th January 2019: Selected topics in theory and observations of Dark Energy (Tunch) ==
  
-Salvador Ramirez (ITP, Universität Heidelberg) - TBA+Salvador Ramirez (ITP, Universität Heidelberg) - "​Deser-Woodard Model and its Reconstruction Problem" ​
  
 +
 +Nonlocal modifications of gravity arise when one attempts to see the effects of radiative corrections at the classical level. These corrections are often impractical,​ they are difficult to calculate and depend on the method used and assumptions about the source of the corrections. To overcome this we can take a top-down approach, and construct an action with nonlocal terms based on their properties. Deser-Woodard model follows this approach and constructs an action with one of the simplest nonlocal terms and an arbitrary function. We will discuss the reconstruction problem of this model and provide a method to reproduce any given background. Since the model differs with $\Lambda$CDM at the perturbation level, we can test the model with observational data.
  
 == 17th January 2019: Journal Club == == 17th January 2019: Journal Club ==
  
-TBA+Jiaming Zhao \\ 
 + 
 +KiDS+GAMA: Constraints on Horndeski gravity from combined large-scale structure probes \\ 
 +Alessio Spurio Mancini, Fabian Köhlinger, Benjamin Joachimi, Valeria Pettorino, Björn Malte Schäfer, Robert Reischke, Samuel Brieden, Maria Archidiacono et al. \\ 
 +ePrint: arXiv: 1901.03686 \\ 
 + 
 +Julius Wons \\ 
 + 
 +Melanopogenesis:​ Dark Matter of (almost) any Mass and Baryonic Matter from the Evaporation of Primordial Black Holes weighing a Ton (or less)  \\ 
 +Logan Morrison, Stefano Profumo, Yan Yu \\ 
 +ePrint: arXiv: 1812.10606 \\
  
 == 10th January 2019: Selected topics in theory and observations of Dark Energy (Tunch) == == 10th January 2019: Selected topics in theory and observations of Dark Energy (Tunch) ==

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