Cosmology 2023 in Miramare

Session

Posters of friday (ignore time)

1 Sept 2023, 21:35

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

78. A Lagrangian formulation of interacting dark sectors.

Mr Saddam Hussain (IndiaDepartment of Physics, Indian Institute of Technology Kanpur, India)

01/09/2023, 21:35

In the age of precision cosmology, the LambdaCDM model precisely fits most cosmological observations; however, discrepancies have been reported in measuring a local Hubble parameter at low and high redshifts. One possible way to reduce Hubble tension is by allowing dark sectors to interact. Historically, this has been accomplished by incorporating the interaction term at the covariant...

86. CMB imprints of high scale non-thermal leptogenesis

Abhijit Kumar Saha (Indian Association for the Cultivation of Science)

01/09/2023, 21:35

We study the imprints of high scale non-thermal leptogenesis on cosmic microwave background (CMB) from the measurements of inflationary spectral index ($n_s$) and tensor-to-scalar ratio ($r$), which otherwise is inaccessible to the conventional laboratory experiments. We argue that non-thermal production of baryon (lepton) asymmetry from subsequent decays of inflaton to heavy right-handed...

80. Covariant formulation of MOND from hyperconical metrics and observational constraints

Robert Monjo

01/09/2023, 21:35

Modified Newtonian Dynamics (MOND) can partially explain the excess of rotation of galaxies, or the equivalent mass discrepancy-acceleration, without the requirement of dark matter halos. This work proposes a modification of GR based on the distorted stereographic projection of hyperconical universes, which leads to MOND effects at galactic scales. To describe the mass discrepancy-acceleration...

81. f(R) gravity with broken Weyl gauge symmetry and its effects on cosmological evolution

Jiwon Park (Soongsil University)

01/09/2023, 21:35

We propose a new class of f(R) theory where its Weyl gauge symmetry is broken in the primordial era of the universe. Due to the geometrical nature of the symmetry, the symmetry breaking induces an additional non-minimal coupling of the scalar field corresponding to the f(R) model. This cannot be expected in the standard f (R) theories. We explain how this affects the evolution of the universe...

85. Non-conserve mater energy-momentum (NCMEM) model of gravity: Reconstructing and Thermodynamics

Khaled Saaidi (University of Kurdistan)

01/09/2023, 21:35

In this work, the Rastall model of gravity is generalized different models of non-conserve mater energy momentum model of gravity is constructed. In fact, we show that by imposing the ordinary or generalized form of Rastall assumption on perfect fluid energy-momentum tensor (EMT), one can find different {\bf {forms}} of modified Einstein's field equation (EFE). We investigate the...

88. Parity violating gravitational waves at the end of inflation

António Torres Manso

01/09/2023, 21:35

Inflaton-vector interactions of the type $\phi F\tilde{F}$ have provided interesting phenomenology to tackle some of current problems in cosmology, namely the vectors could constitute the dark matter component. It could also lead to possible signatures imprinted in a gravitational wave spectrum. Through this coupling, a rolling inflaton induces an exponential production of the transverse...

83. Cosmology using 1-loop EFT power spectrum for HI intensity mapping

Liantsoa Finaritra Randrianjanahary

We explore the information from HI power spectrum in redshift space using 1-loop EFT power spectrum model and HIRAX survey. This work is an extension of our recent paper on Cosmological constraints from the power spectrum and bispectrum of 21cm intensity maps. We marginalise over bias and nuisance parameters. We notice from the results that CMB Planck 2018 constraints can be improved if we add...

82. Scalar-nonmetricity cosmology in the general relativity limit

Laxmipriya Pati (University of Tartu)

In symmetric teleparallel geometry, the curvature and torsion tensors are assumed to vanish identically, while the dynamics of gravity is encoded by the nonmetricity. Here the spatially homogeneous and isotropic connections that can accompany flat Friedmann-Lema\^itre-Robertson-Walker metric come in three sets. Working in the context of symmetric teleparallel scalar-tensor gravity with generic...