Cosmology 2023 in Miramare

Session

Parallel

31 Aug 2023, 15:00

Main Auditorium (SISSA Building, Miramare, Trieste, Italy)

128. The Gaia and HST Cepheid Scales, Galactic Reddening, and the 𝐻0 Tension

Tom Shanks

31/08/2023, 15:00

The latest SH0ES results claim that the distance scale route to 𝐻0 is accurate to ±1% which creates a 9% or 5𝜎 discrepancy with the Planck 𝐻0 value. Here we study the SH0ES error budget in the 3 rungs of their distance ladder. After checking the validity of the suggested correction to the Gaia distances using ≈ 1000 open clusters, we confirm that the previous Milky Way HST calibration of the...

131. Towards precision cluster cosmology: advancements in Halo Mass Function and Bias within Euclid

Tiago Batalha de Castro

31/08/2023, 15:00

In this presentation, I present the current advances in the theoretical description of the halo mass function and halo bias aiming to improve the understanding of the dark sector through cluster cosmology with Euclid's photometric galaxy cluster survey. Utilizing a Bayesian approach and a suite of N-body simulations, we analyze the convergence of HMF and HB predictions, the impact of different...

130. Bayesian end-to-end CMB analysis from LFI to HFI

Artem Basyrov

31/08/2023, 15:25

In this talk I will give an overview of the BeyondPlanck project, which was an end-to-end re-analysis of the LFI data, and discuss a future extension to HFI within the Cosmoglobe collaboration. This method aims to process raw time-ordered data into final cosmological and astrophysical products within one computer code, and implements standard Bayesian Monte Carlo methods. By now this framework...

127. Could enhanced structure formation ease large-scale cosmological tensions?

Alfie Russell

31/08/2023, 15:25

The “Standard Model of Cosmology” (ΛCDM) is increasingly in tension with new observations. High redshift galaxies observed by JWST and clusters such as El Gordo appear to be too massive too early, whilst supervoids are more frequent and underdense than expected. Local bulk flows also appear to be larger than predicted and the Hubble Tension casts doubt onto our understanding of dark energy. A...

123. Bulk peculiar flows and cosmic acceleration

Kerkyra Asvesta

31/08/2023, 15:50

Peculiar motions dominate the kinematics of the local universe. Also, well beyond our local neighbourhood, peculiar-velocity surveys have repeatedly reported the existence of bulk peculiar flows extending out to several hundreds of Mpc. Historically, relative-motion effects have been known to interfere with the way we have interpreted the observations in a number of cases. This work...

135. Foreground bias in CMB lensing convergence estimation

Kishan Deka

31/08/2023, 15:50

Cosmic Microwave Background (CMB) photons experience weak gravitational lensing due to the large-scale structure of the Universe along their path. The weak lensing generates a divergence-free component of the polarization field known as B-modes, through the gravitational lensing of the primordial curl-free component of the field, known as E-modes. Estimating the lensing power spectra and...

126. Can neutrino-assisted early dark energy models ameliorate the $H_0$ tension in a natural way?

Rogerio Rosenfeld (Instituto de Física Teórica - UNESP & ICTP-SAIFR & LIneA)

31/08/2023, 16:15

The idea of neutrino-assisted early dark energy ($\nu$EDE), where a coupling between neutrinos and the scalar field that models early dark energy (EDE) is considered, was introduced with the aim of reducing some of the fine-tuning and coincidence problems that appear in usual EDE models. In order to be relevant in ameliorating the $H_0$ tension, the contribution of EDE to the total energy...

133. Minkowski Functionals as a tool to study Non-Gaussianity and anisotropy: new extensions to CMB polarization and beyond

Dr Javier Carrón Duque

31/08/2023, 16:15

Minkowski Functionals (MFs) are statistical tools that describe the geometry and topology of a field and, therefore, can probe information complementary to the angular power spectrum, such as non—Gaussianity and deviations from statistical isotropy. MFs have been used in many applications such as blind tests of non—Gaussianity in the CMB, improvement of parameter constraints in weak lensing...

160. Exploiting the impact of our peculiar velocity on a galaxy redshift survey, aka the finger of the observer effect

Cristiano Porciani

31/08/2023, 17:00

134. Hydrogen Intensity Mapping: The ultimate signal is the weakest of all

Isabella Carucci

31/08/2023, 17:00

Probing the Universe's large-scale structure (LSS) leads to a wealth of cosmological information. With the advent of unprecedentedly giant radio telescopes, we can start using the neutral hydrogen (HI) 21-cm emission to trace the LSS. In particular, a novel observational strategy is catching on: Intensity Mapping (IM). With IM, we relax the requirement of source detection and go after all the...

137. Constraining new physics with TeV gamma-rays

Sunniva Jacobsen

31/08/2023, 17:25

In this talk, I will present the results of two recent papers that both use observations of TeV gamma-rays from blazars to constrain physics models. In the first paper, we use the flux spectra from TeV blazars to constrain the viable axion-like particle parameter space. We show that an axion-like particle that mixes with photons can lead to an overproduction in the TeV spectra of distant...

132. Unveiling dark fifth forces with linear cosmology and LSS

Salvatore Bottaro

31/08/2023, 17:25

We investigate the imprints of new long-range forces mediated by a new light scalar acting solely on dark matter. Dark fifth forces in general will modify the background evolution as well as the growth of density fluctuations. At the linear level, constraints are derived from CMB together with a full-shape analysis of the power spectrum as measured by BOSS. At the non-linear level, the...

117. Evidence for strong progenitor age bias in supernova cosmology

Young-Wook Lee

31/08/2023, 17:50

Supernova (SN) cosmology is based on the assumption that the width-luminosity relation (WLR) and the color-luminosity relation (CLR) in the type Ia SN luminosity standardization would not show luminosity offsets with progenitor age. Unlike this expectation, recent age datings of stellar populations in host galaxies have shown significant correlations between progenitor age and Hubble residual...

125. SICRET: Supernova Ia Cosmology with truncated marginal neural Ratio EsTimation

Kosio Karchev (SISSA / GRAPPA)

31/08/2023, 17:50

Type Ia supernovae (SNae Ia), standardisable candles that allow tracing the expansion history of the Universe, are instrumental in constraining cosmological parameters, particularly dark energy. State-of-the-art likelihood-based analyses scale poorly to future large data sets, are limited to simplified probabilistic descriptions, and must explicitly sample a high-dimensional latent posterior...

129. Dissipative Inflation via Scalar Production

Borna Salehian

31/08/2023, 18:15

We describe a new mechanism that gives rise to dissipation during cosmic inflation. In the simplest implementation, the mechanism requires the presence of a massive scalar field with a softly-broken global U(1) symmetry, along with the inflaton field. Particle production in this scenario takes place on parametrically sub-horizon scales. Consequently, the backreaction of the produced particles...

122. Simultaneous alleviation of major cosmological tensions through LsCDM cosmology

Ozgur Akarsu

31/08/2023, 18:15

In this talk, we will first give a brief introduction to the ${\mathrm{\Lambda }}_{\mathrm{s}}$CDM model, which explores the recent conjecture suggesting a rapid transition of the universe from anti-de Sitter vacua to de Sitter vacua, viz., the cosmological constant switches sign from negative to positive at redshift $z_{†}\sim 1.7$, inspired by the graduated dark energy (gDE). And then, we will present...