Cosmology 2023 in Miramare

Session

Posters of thursday (ignore time)

Aug 31, 2023, 9:35 PM

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

70. Baryogenesis in non-minimal mimetic gravity

Niloufar Hosseinkhan

8/31/23, 9:35 PM

We studied Gravitational baryogenesis in context of non-minimal mimetic gravity where mimetic matter is nonminimally coupled to Ricci scalar. Baryogenesis is considered as a process in which baryons excess over anti-baryons in the early stage of the universe. We explored how nonminimally coupled mimetic gravity could shed light on the problem of baryon asymmetry successfully. Various types of...

76. Cosmological constraints on SuperWIMPS

Dipan Sengupta (University of Adelaide)

8/31/23, 9:35 PM

We provide a comprehensive analysis of constraints on Supersymmetric gravitinos and axinos originating from spectral distortion, BBN and Lyman-alpha considerations. We analyze the current status and future prospects of such scenarios from cosmological probes. Furthermore, we provide the complementary constraints from collider data and assess the future discovery prospects.

71. Determining parameters of a black-hole accretion-disk system from the observation of shadow

Umpei Miyamoto (Akita Prefectural University)

8/31/23, 9:35 PM

We revisit the classic system of a Schwarzschild black hole with a thin accretion disk to investigate how to determine the parameters of this system (mass M, inclination angle i, and distance D) from the observation of shadow. A novel point of our analysis is to leave the distance between the black hole and observer to be finite. We show that one can determine (M, i, D) from the information of...

77. Modern Cosmology, the standard model: A philosopher's view. - (general)`

Mogens True Wegener

8/31/23, 9:35 PM

It is my duty as a philosopher to fight dogmatism - especially when aired in weird hypotheses bolstered up with high-brow mathematics. Anticipating the Einstein SR paper of 1905 by three weeks, Poincare published a formally more refined theory based on i = V(-1), where he predicted the reality of 'ondes gravifiques'. Against Einstein he argued that space has no innate metric, its only...

69. Multifield Ultralight Dark Matter

Mateja Gosenka

8/31/23, 9:35 PM

Ultralight dark matter (ULDM) is an intriguing dark matter candidate with astrophysically testable predictions. While single field models have been widely studied, they are by now fairly constrained by observations. However, in particle physics, models with N light scalar fields which interact only gravitationally are equally well motivated. In my talk, I will explore this possibility and...

74. Observational constrained F(R,G) gravity cosmological model and the dynamical system analysis

Santosh Lohakare (BITS-Pilani, Hyderabad Campus, India)

8/31/23, 9:35 PM

The geometrical and dynamical parameters of the F(R,G) gravity cosmological model is constrained through the cosmological data sets. The functional form of F(R,G) involves the square Ricci scalar and the higher power of the Gauss-Bonnet invariant. The observed value of the free parameters in the expression of H(z), the Hubble parameter, indicates a different phase of the evolution of the...

68. PROBING PRIMORDIAL NON-GAUSSIANITY WITH THE MULTI-TRACER TECHNIQUE

Simthembile Dlamini

8/31/23, 9:35 PM

In the near future, cosmic large scale structure will be mapped with increasing detail by the next generation of observational facilities operating at various wavelengths (radio, optical, infra-red) and exploiting various techniques. Mean-while, theory and simulations are increasing in sophistication in their ability to describe large-scale structure. These advances could potentially allow...

75. Quantifying and mitigating the effect of snapshot interval in light-cone Epoch of Reionization 21-cm simulations

Suman Pramanick

8/31/23, 9:35 PM

The Epoch of Reionization (EoR) neutral Hydrogen (H I) 21-cm signal evolves significantly along the line-of-sight (LoS) due to the light-cone (LC) effect. It is important to accurately incorporate this in simulations in order to correctly interpret the signal. 21-cm LC simulations are typically produced by stitching together slices from a finite number (𝑁) of “reionization snapshot”, each...

73. Studying the Full Phase Space of Sterile Neutrino Dark Matter from a B-L Phase Transition

Jondalar Kuss

8/31/23, 9:35 PM

Sterile Neutrinos are well motivated Dark Matter candidates. They arise naturally in models with gauged U(1) B-L symmetries to avoid anomalies. While previous studies have focused on the Sterile Neutrino abundance, knowing their spectrum is important to determine whether they can actually explain the observed Dark Matter. I numerically solve the full Boltzmann equation for Sterile Neutrinos in...

72. Testing the assumptions of the EFTofLSS

Mandar Karandikar (University of Bonn)

8/31/23, 9:35 PM

By infusing perturbation theory with information from small-scale N-body simulations, the EFTofLSS makes accurate predictions of summary statistics of the matter density field in the quasi-linear regime. In this work, we test the assumptions of the EFTofLSS by comparing its two flavours -- 1) a bottom-up construction which calculates the EFT coefficients by directly matching a summary...