GEMMA 2

Session

Poster Session

18 Sept 2024, 16:15

Aula Cabibbo (CU033 FISICA E. FERMI - ground floor) (Rome, Italy)

36. A directed continuous-wave search from neutron stars in binary systems with the 5-vector resampling technique

Gravitational waves

Poster

Continuous gravitational-wave signals (CWs), which are typically emitted by rapidly rotating neutron stars (NSs) with non-axisymmetric deformations, represent particularly intriguing targets for the Advanced LIGO-Virgo-KAGRA detectors. These detectors operate within sensitivity bands that encompass more than half of the known pulsars in our galaxy existing in binary systems, which are the...

55. A neural networks method to search for long transient gravitational waves

Gravitational waves

Poster

I will present a new technique to search interferometric detector data for long transient gravitational wave signals, such as those predicted from rapidly spinning newborn magnetars.
Because of the fast frequency variation of these signals, standard search techniques are computationally unfeasible (matched filtering) or very demanding (sub-optimal semi-coherent methods).
We investigated an...

58. A novel machine-learning based method to search for continuous-wave signals from neutron stars in binary systems

Gravitational waves

Poster

We present an innovative machine-learning-based approach to identify double-horn signature signals in the power spectrum of continuous gravitational waves (CWs) emitted by neutron stars in binary systems. When received at Earth-based observatories, CWs undergo Doppler modulation due to both Earth's motion and the source's orbital motion, the latter of which creates the distinctive double-horn...

12. Absolute Unified Mathematics of Quantum Gravitation

Mr Aayush Sinha

Poster

This paper delves into the structured framework of Absolute Unified Mathematics, where the skew-symmetric (vorticity) and symmetric (strain-deformation) types' quantum fields are found embedded in Einstein curvature tensor. It turns out that these fields encapsulate Dirac matrices of types: $ \gamma_{\alpha} $ and $ {\partial_{\mu}{\gamma_{\alpha}}} $, concealed as modules within Christoffel...

70. Accounting for Neutron Star Tidal Deformability in Compact Binary Coalescence Template Banks

Poster

Current LIGO-Virgo-KAGRA modeled searches for gravitational waves emitted by compact binary coalescences treat binary neutron star and neutron star-black hole sources as point-particle systems, ignoring the influence of the internal neutron star physics. The main finite-size effects are due to tidal deformations of neutron stars induced by the gravitational coupling in the binary. Such effects...

62. Advanced techniques for Quantum Noise reduction in next Gravitational Waves detectors: SIPS integration for Einstein-Podolsky-Rosen squeezing experiment

Poster

Advanced techniques for Quantum Noise reduction in next Gravitational Waves detectors: SIPS integration for Einstein-Podolsky-Rosen squeezing experiment

Presentation type: Poster

Authors: W. Ali 1,2, B. Garaventa 1, F. Sorrentino 1, M. Bawaj 6, M. De Laurentis 3, F. De Marco 4,5, S. Di Pace 4,5, L. Naticchioni 4, V. Sequino 3, S. Lee 8, S.Pak 9, J. Gyu Park 7, K.Kim 8, H. Ahn9, S. Lee...

48. Assessing the robustness of targeted searches for continuous gravitational wave signals in LIGO-Virgo data

Gravitational waves

Poster

The detection of continuous gravitational wave (CW) signals from rapidly rotating neutron stars remains a significant challenge for the LIGO and Virgo observatories. The robustness of the targeted searches for known pulsars is critical, as various factors can adversely affect the sensitivity and accuracy of detection. This poster will delve into the current robustness of our targeted search...

56. Cutting-edge strategies to identify new gravitational and electromagnetic wave long transients using current and next-generation detectors

Gravitational waves

Poster

Following the historic discovery of signals from coalescing black hole and neutron star (NS) binaries, the new frontier in gravitational wave (GW) science is the search for new classes of GW sources. In this respect, long transient signals, emitted by fast-rotating magnetars, hold great potential for a breakthrough discovery in the forthcoming LIGO/Virgo/KAGRA (LVK) science runs. Various...

30. Effects of nuclear saturation properties on neutron star f mode oscillation from a machine learning

Deepak Kumar

Poster

We investigate the intricate relationships between the non-radial (f) mode oscillation frequencies of neutron stars (NS)s and the corresponding nuclear matter equation of state (EOS) using a machine learning (ML) approach within the ambit of the relativistic mean field (RMF) framework for nuclear matter. With two distinct parameterizations of the Walecka model, namely, (1) with non-linear...

83. GPU implementations of the Hough transform for continuous waves searches

Poster

The Hough transform pattern recognition algorithm is at the core of several searches for long duration gravitational-wave signals.
In particular, two pipelines used for all-sky searches of non-axisyimmetrically rotating neutron stars are built around the Hough transform to reconstruct the path of isolated sources in the parameters space along months of observation: the Sky Hough and...

82. Image filtering to improve the sensitivity of long-lasting gravitational-wave searches

Poster

Newly-born neutron stars, resulting from supernova explosions or mergers between neutron stars and/or white dwarfs, can exhibit strong magnetic fields and instabilities at their early stage, with consequent emission of long-lived gravitational waves. Searches for those gravitational waves are typically carried on with so-called semi-coherent methods, which are less sensitive with respect to an...

77. Inferring the Hubble Constant using Joint Stochastic and Dark Siren Analysis

Poster

I will present a prospective technique to infer the Hubble constant $H_0$ through a joint analysis of dark sirens-gravitational wave sources without electromagnetic counterparts-and the stochastic gravitational wave background (SGWB). Traditional methods for measuring $H_0$, which rely on either local distance ladder techniques or observations of the cosmic microwave background, face...

10. POST-NEWTONIAN GENERATION OF GRAVITATIONAL WAVES IN EINSTEIN-CARTAN THEORY

Emmanuele Battista (Istituto Nazionale di Fisica Nucleare)

Poster

In this seminar, we investigate the topic of gravitational waves in the context of Einstein-Cartan theory by exploiting the Blanchet-Damour formalism.
Einstein-Cartan model has been formulated to extend the concepts of general relativity to the microphysical realm in order to establish a connection between gravity and the other fundamental interactions. In this framework, the quantum...

80. SEARCH FOR CONTINUOUS GRAVITATIONAL-WAVE SIGNALS IN LIGO DATA WITHIN THE SCHENBERG ANTENNA SENSITIVITY RANGE

Poster

The Schenberg antenna, a spherical resonant mass detector, had its last operational run in 2015 at the University of São Paulo and was subsequently dismantled in 2016. Despite this, there remains significant interest within the Brazilian scientific community to revive the project, driven by promising recent results in gravitational wave (GW) research. Although the initial sensitivity of...

60. The Einstein-Podolsky-Rosen conditional squeezing scheme for broadband Quantum Noise reduction in Gravitational-Wave detectors

Gravitational waves

Poster

Frequency-Dependent Squeezing (FDS) represents an effective way to reduce Quantum Noise in ground-based GW detectors, along the whole detection band. Although FDS affects the entire bandwidth, its best performance lies in the high frequency end (>200 Hz), as already found experimentally. Hence, the signal-to-noise ratio can be increased for detection of sources such as BNS systems and CWs from...