Cosmology 2023 in Miramare

Session

Posters of wednesday (ignore time)

30 Aug 2023, 21:35

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

59. Astrometric Redshifts of Supernovae

Jason Lee

30/08/2023, 21:35

I would like to present a poster on this work. Differential Chromatic Refraction (DCR), caused by the wavelength dependency of the refractive index of our atmosphere, is usually an effect we need to mitigate for ground-based observations. However, DCR depends on the spectral energy distribution (SED) of an object, meaning that light from sources such as supernovae (both Type Ia and Type II)...

56. Caustic Mass and Modified Gravity

Minahil Butt

30/08/2023, 21:35

Extensions to the standard lambda-CDM model have the potential to explain observed cosmological phenomena such as dark matter and dark energy. Measurement of the masses of galaxy clusters using different methods provide a great opportunity to contrast the modifications to gravity against standard GR scenario at small scales (non-cosmological). The Chameleon and Vainstein screening mechanisms...

66. Cosmological significance of the early bright galaxies observed by JWST

Moncy Vilavinal John

30/08/2023, 21:35

The two bright early galaxy candidates GL-z10 and GL-z12 [Naidu et al 2022 ApJL 940 L14, Castellano et al 2022 ApJL 938 L15], discovered with the near infra-red camera (NIRCam) imaging data from the Glass-JWST Early Release Science Program are unexpected, since they must be over a million solar masses and have built-up their masses in only < 300-400 Myr after the Big Bang in the LCDM model....

62. Efficient Exploration of the Cosmic Reionization

Barun Maity (NCRA-TIFR)

30/08/2023, 21:35

According to the standard hot Big Bang model of cosmology, the universe was mostly ionized and hot at very early stages. Then it cooled down with time and became predominantly neutral around 380,000 years after birth. Reionization is the era when the universe is again ionized by the photons coming from the first luminous sources. This is still one of the least understood phases in the...

65. Renormalization Group Running Induced Cosmic Inflation

Istvan Nandori (MTA-DE Particle Physics Research Group, MTA-ATOMKI, Debrecen)

30/08/2023, 21:35

In my talk I show that pre-inflationary quantum fluctuations can provide a scenario for initial conditions for the inflaton field. The proposal is based on the assumption that at very high energies (higher than the energy scale of inflation) the vacuum-expectation value (VeV) of the field is trapped in a false vacuum and then, due to renormalization-group (RG) running, the potential starts to...

60. Resolution test for modified gravity models

Flor de María Lozano Rodríguez

30/08/2023, 21:35

We study the reliability of the MG-PICOLA code through resolution tests, where we vary the numerical parameters in the cosmological simulations. We do the analysis with three modified gravity models: Hu-Sawicki $f(R)$, nDGP (the normal branch of the Dvali, Gabadadze, and Porrati model), and the Symmetron. For the DGP model we compare our results with those of the MG-GLAM code. We found that...

57. Testing Gravity with CMB and LSS cross-correlations

Guglielmo Frittoli

30/08/2023, 21:35

The accelerated expansion of the Universe is one of the greatest mysteries of modern cosmology. Upcoming and future cosmological observations will help to shed light on this feature of our Universe. The accelerated expansion is canonically attributed to the Dark Energy (DE), encapsulated in the Lambda factor in the Einstein field equations of gravity, but its nature is still not understood....

55. Using cyclic conformal cosmology connecting initial time step, entropy and Planck mass sized black holes: forming a cosmological constant about Primordial black holes

Andrew Beckwith (Chongqing University)

30/08/2023, 21:35

Based on the idea of cyclic conformal cosmology, we postulate that supermassive black holes break up at the end of a cycle of creation, and are then broken down at the onset of inflation. To do this, we use the Bose-Einstein Condensation (BEC) formulation to describe the effect of entropy production for black holes, as well as a previous document discussing a quantum number n that is attached...

63. Gravitational waves from quasi-stable cosmic strings and implication to NANOGrav 15-year data

RINKU MAJI (Physical Research Laboratory Ahmedabad)

We discuss the stochastic gravitational wave background emitted from a network of 'quasi-stable' strings and its realization in grand unified theories. A symmetry breaking in the early universe produces monopoles that suffer partial inflation. A subsequent symmetry breaking at a lower energy scale creates cosmic strings which are effectively stable against the breaking via Schwinger...

64. Leptogenesis and eV sterile

Dr Ananya Mukherjee (Saha Institute of Nuclear Physics)

We consider the minimal extended seesaw model which can accommodate an eV scale sterile neutrino. The scenario also includes three heavy right handed neutrinos in addition to the light sterile neutrino. In this model, the active-sterile mixing act as non-unitary parameters. If the values of these mixing angles are of O(0.1), the model introduces deviation of the PMNS matrix from unitarity to...