Cosmology 2023 in Miramare

Session

Posters of tuesday (ignore time)

29 Aug 2023, 21:30

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

52. Dark Gravity confronted with Supernovae, Baryonic Oscillations and Cosmic Microwave Background data

Frederic HENRY COUANNIER (cppm), Frederic Henry-Couannier

29/08/2023, 21:30

Dark Gravity (DG) is a background dependent bimetric and semi-classical extension of General Relativity with an anti-gravitational sector. The foundations of the theory are reviewed. The main theoretical achievement of DG is the avoidance of any singularities (both black hole horizon and cosmic initial singularity) and an ideal framework to understand the cancellation of vacuum energy...

45. f(Q)-gravity and neutrino physics

Luis Atayde

29/08/2023, 21:30

Within the f(Q)-gravity framework, we perform a phenomenological study of the cosmological observables in light of the degeneracy between neutrinos physics and the modified gravity parameter, and we identify specific patterns which allow us to break such degeneracy. We also provide separately the constraints on the total mass of the neutrinos, Σmν, and on the effective number of neutrino...

47. Fermion tunneling from Kerr-like black hole of topologically massive gravity

Habiba Bouhalouf

29/08/2023, 21:30

In the context of three dimensional theory of general relativity (TMG), a Kerr-like metric is obtained. Using Penrose diagrams, The causal structure and particle’s diffusion are discussed, and within the fermions tunneling effect approach and WKB approximation, the expression of Hawking temperature is also derived.

44. Holographic complexity in FLRW universe

Yu-Sen An

29/08/2023, 21:30

We investigate the holographic complexity growth rate of a conformal field theory in a Friedman-Lemaître-Roberstson-Walker (FLRW) universe. We consider a brane universe moving in the Schwarzschild background. For this case, we compute the complexity growth rate in a closed universe and a flat universe by using both the complexity-volume and complexity-action dualities. We find that there are...

48. Primordial black hole superradiance and evaporation in the string axiverse

Marco Calza (University of Coimbra)

29/08/2023, 21:30

In the string axiverse scenario, light primordial black holes may spin up due to the Hawking emission of a large number of light (sub-MeV) axions. We show that this may trigger superradiant instabilities associated with a heavier axion during the black holes’ evolution, and study the coupled dynamics of superradiance and evaporation. We find, in particular, that the present black hole...

43. Quintessential Cosmological Tensions

Arsalan Adil

29/08/2023, 21:30

Several cosmological tensions have emerged in light of recent data, most notably in the inferences of the parameters $H_0$ and $\sigma_8$. We explore the possibility of alleviating both these tensions {\it simultaneously} by means of the Albrecht-Skordis ``quintessence'' potential. The field can reduce the size of the sound horizon $r_s^*$ while concurrently suppressing the power in matter...

50. Testing universal dark-matter caustic rings with galactic rotation curves

Daniil Davydov (Institute for Nuclear Research (INR) of the Russian Academy of Sciences)

29/08/2023, 21:30

Infall of cold dark matter on a galaxy may result in caustic rings where the particle density is enhanced. They may be searched for as features in the galactic rotation curves. Previous studies suggested the evidence for these caustic rings with universal, that is common for different galaxies, parameters. Here we test this hypothesis with a large independent set of rotation curves by means of...

53. Thermodynamic equation of state and phase transitions for the spacetime of Friedmann-Robertson-Walker universe

Ya-Peng Hu

29/08/2023, 21:30

It is well-known that the spacetime of Friedmann-Robertson-Walker (FRW) universe is a thermodynamic system, where it has temperature, entropy and satisfies the first law of thermodynamics. We recently make a further significant step that we construct the thermodynamic equation of state for the FRW spacetime for the first time, i.e. P=P (V,T) where the gravitational pressure P is directly...

46. WIMPs in Dilatonic Einstein Gauss-Bonnet Cosmology

Dr Anirban Biswas (CQUeST, Sogang University, Seoul, South Korea)

29/08/2023, 21:30

We use the Weakly Interacting Massive Particle (WIMP) thermal decoupling scenario to probe Cosmologies in dilatonic Einstein Gauss-Bonnet (dEGB) gravity, where the Gauss-Bonnet term is non-minimally coupled to a scalar field with vanishing potential. We put constraints on the model parameters when the ensuing modified cosmological scenario drives the WIMP annihilation cross section beyond the...

49. Analytic modeling of probability distribution function for cosmological counts in cells

Anton Chudaykin (Institute for Nuclear Research)

We study the one-point probability distribution function (PDF) for matter density averaged over spherical cells. The leading part to the PDF is defined by spherical collapse dynamics, whereas the next-to-leading part comes from the integration over fluctuations around the saddle-point solution. The latter calculation receives sizable contributions from short modes and must be renormalized. We...

54. Convolution neural network to characterize the Voigt profile of the Lyman-alpha forest absorbers

Priyanka Jalan

Numerous cosmological studies including the equation of state of the Intergalactic medium (IGM) can be well studied using the Lyman-alpha (Lyα) forest. This work aims to develop a machine learning (ML) algorithm to analyze the absorption lines in the Lyα forest. This involves a two-part process: (i) a classification algorithm based on a Deep Neural Network to predict the number of Voigt...