# Nuclear Physics in Astrophysics - X

Sep 4 – 9, 2022
CERN
Europe/Zurich timezone

## Tension between implications from PREX-2 data and gravitational tidal response on dense matter equation of state

Sep 6, 2022, 6:00 PM
3h
61/1-201 - Pas perdus - Not a meeting room - (CERN)

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Poster

### Speaker

Mr Vivek Baruah Thapa (Indian Institute of Technology Jodhpur)

### Description

The isospin dependent nuclear saturation property has a salient role to play in understanding the matter behaviour at high density regimes. Very recently an improved value of neutron skin thickness of $^{208}\text{Pb}$ was reported in Lead Radius EXperiment-II (PREX-2) to be $R_{\text{skin}}=R_n - R_p=(0.283\pm 0.071)$ fm which corresponds to high estimations of nuclear symmetry energy ($E_{\text{sym}}$) and its slope ($L_{\text{sym}}$). The updated values of $E_{\text{sym}}$ and $L_{\text{sym}}$ commensurating to the neutron star observable estimations exterior to the astrophysical observed range. Gravitational waves detected from binary compact star merger events and subsequent estimations of tidal deformabilities ($\tilde{\Lambda}$) also play a vital role in constraining dense matter nature. The higher values of $L_{\text{sym}}$ at $n_0$ deduced from recent PREX-II data correlates to matter being easily deformable (yielding higher radius values) around intermediate matter densities leading to higher values of $\tilde{\Lambda}$.

The coupling restrictions for hyperonic sector are extracted from $\Lambda$ and $\Xi$ hypernuclei experiments and those in $\Delta$-resonances from scattering off nuclei and heavy ion collision data. In this work, we find that the appearance of heavier non-strange baryons at lower density regimes leads to easing off this tension by exploring the meson-$\Delta$ baryon coupling parameter space.

### Primary author

Mr Vivek Baruah Thapa (Indian Institute of Technology Jodhpur)

### Co-author

Dr Monika Sinha (Indian Institute of Technology Jodhpur)