Description
https://pitt.zoom.us/j/96734791723
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Silvano Tosi (INFN e Universita Genova (IT))24/05/2021, 16:30Cosmology
Cosmology experiments are often based on large-scale surveys on satellite and need methods to perform in-flight relative flux self-calibrations of their spectro-photometer instruments. In this talk a method is proposed where the instrument response function is inferred with a chi square statistics in an unbiased way, simulating a simplified sequence of observations with realistic distributions...
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Itamar Allali24/05/2021, 16:45Cosmology
There are currently tensions between observations of the early and late Universe in the determination of the cosmological parameters $S_8$ and $H_0$. In this talk, I will discuss a new phenomenological model that addresses these tensions. Our scenario features: (i) a decaying dark energy fluid, which undergoes a transition at $z \sim 5,000$, to raise today's value of the Hubble parameter --...
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Shouvik Roy Choudhury (Indian Institute of Technology Bombay)24/05/2021, 17:00Cosmology
Based on: JCAP 03 (2021) 084 (arXiv: 2012.07519)
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We have updated the constraints on flavor universal neutrino self-interactions mediated by a heavy scalar, in the effective 4-fermion interaction limit. Based on the latest CMB temperature data from the Planck 2018 data release as well as auxiliary data we confirm the presence of a region in parameter space with relatively strong... -
Yo Toda24/05/2021, 17:15Cosmology
The standard Lambda CDM cosmological model now seems to face some puzzles. One of the most serious problems is the so-called Hubble tension; the values of the Hubble constant obtained by local measurements look inconsistent with that inferred from CMB. Although introducing extra radiations $\Delta N_{\textrm{eff}}$ such as hot axions or sterile neutrinos appears to be promising, such extra...
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Rance Solomon24/05/2021, 17:30Cosmology
A previous analysis of light curves from 13 quasars in the MACHO survey has shown some cor-relation among short time scale variations. Particularly, in the quasar’s rest frame, linear segments over time scales on the order of 100 days indicate a common slope. Though the source of this feature is at present unknown, such a commonality could allow one to determine the relative redshift of one...
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Yucheng QIU (The Hong Kong University of Science and Technology)24/05/2021, 17:45Theoretical Developments & Extra Dimensions
In string theory picture, Planck scale $M_{\rm Pl}$, the supersymmetry-breaking scale $m_s$, electroweak scale $m_{\rm EW}$ and vacuum energy density (cosmological constant) $\Lambda$ are to be dynamically determined from string scale $M_S$. Here we consider a model that links the supersymmetric electroweak phenomenology to string theory motivated flux compactification approach. The model...
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Dr Marco Frasca24/05/2021, 18:00
Non-local quantum field theories have been studied recently as a promising approach to go beyond the Standard Model (e.g. see [1–3]). This approach is strongly motivated by string theory (p-adic string field theory) [4–6]. These theories have the properties of UV-completeness and (proposed as a direction of UV-completion the non-local inifinte-derivative theories) are ghost-free...
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Zixin Yang (Deutsches Elektronen-Synchrotron DESY)24/05/2021, 18:15Cosmology
The worldline effective field theory formalism provides a systematic approach to probe the post-Minkowskian binary scattering processes. Expanding to include spin degrees of freedom, we compute the total change in momentum and spin in the gravitational scattering of compact objects to next-to-leading PM order with linear and bilinear spin effects and arbitrary initial conditions. Using the...
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Hoang Nhan LUU (The Hong Kong University of Science and Technology)24/05/2021, 18:30Cosmology
The $\Lambda$CDM model provides an excellent fit to the CMB data. However, a statistically significant tension emerges when its determination of the Hubble constant $H_0$ is compared to the local distance-redshift measurements. The axi-Higgs model, which couples ultralight axions to the Higgs field, offers a specific variation of the $\Lambda$CDM model. It relaxes the $H_0$ tension as well as...
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