Article
Engineering, Electrical & Electronic
Siqi Cai, Wenhui Zhang, Tao Sun, Chencheng Yu, Jinling Jiang, Bin Cai, Jiuchao Qian, Jing Zhang, Yan Su, Jian Zhao
Summary: This article proposes a self-test and calibration technique to reduce the effect of flicker noise in reference voltages due to nonlinear stiffness mismatch in two channels in differential MEMS accelerometers. Through detecting the frequency response induced by the sinusoidal test signal, the oscillating amplitude of the two channels is properly adjusted to meet a theoretically derived noise cancellation condition. A prototype is implemented to verify the suggested approaches.
IEEE SENSORS JOURNAL
(2023)
Article
Astronomy & Astrophysics
Lorenzo Valbusa Dall'Armi, Angelo Ricciardone, Daniele Bertacca
Summary: This study tests the isotropy of the Universe using the Astrophysical Gravitational Wave Background, and applies a component separation technique to disentangle different contributions.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
Jose A. R. Cembranos, Miguel Gonzalez Ortiz, Prado Martin-Moruno
Summary: This paper investigates the phenomenon of graviton-photon oscillation in a cosmological scenario, considering a background cosmic magnetic field and different gravitational frameworks. We find that there exists a damping term that characterizes the attenuation of the conversion probability in cosmological backgrounds, which is a general feature. Additionally, we show that the effects of decoherence caused by interaction with the cosmological expansion and alternative theories of gravity's additional degrees of freedom can be relevant to the phenomenon of graviton-photon mixing.
Article
Astronomy & Astrophysics
Giulia Cusin, Gianmassimo Tasinato
Summary: Researchers have found that Doppler anisotropies in the stochastic gravitational wave background (SGWB) can be influenced by kinematic effects, especially when there are large frequency tilts or significant intrinsic anisotropies. They have developed a method to use Doppler effects as complementary probes of the SGWB frequency profile and discussed the prospects for constraining parameters controlling kinematically induced anisotropies with future detector networks.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
Raissa F. P. Mendese, Nestor Ortiz, Nikolaos Stergioulas
Summary: The spectrum of oscillating compact objects can be significantly changed in alternative theories of gravity, potentially revealing modes not present in general relativity. Detection of these modes could provide insights into the underlying theory of gravity. This study focuses on numerical simulations of neutron stars in scalar-tensor theories to analyze the spectral features and compare with linear perturbation theory, identifying distinct nonlinear dynamics in different classes of models.
Article
Mechanics
S. F. Lewin, C. P. Caulfield
Summary: Motivated by the variation of local shear produced by internal waves in the ocean, this study investigates the effect of a time-dependent shear forcing on the evolution and mixing of turbulence produced by Kelvin-Helmholtz instability (KHI) through direct numerical simulations. The results demonstrate that turbulence produced by KHI with a decelerating shear mixes in a distinctly different way from the flow with constant background shear, with characteristics more in common with convectively driven flows.
JOURNAL OF FLUID MECHANICS
(2022)
Article
Astronomy & Astrophysics
Raphael Flauger, Nikolaos Karnesis, Germano Nardini, Mauro Pieroni, Angelo Ricciardone, Jesus Torrado
Summary: A data analysis methodology was proposed for model-independent reconstruction of the spectral shape of a stochastic gravitational wave background with LISA;
The improved algorithm includes a complete set of TDI channels, reducing uncertainties, avoiding local extrema in likelihood maximization, and breaking degeneracies between signal and instrumental noise;
Testing with case studies showed that additional channels are helpful in various ways for the reconstruction process.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
Theodoros Papanikolaou
Summary: This study gives a first estimate for the primordial black hole (PBH) threshold in the case of a time-dependent equation-of-state parameter. By generalizing the constant parameter prescription and applying it to the QCD phase transition, the study suggests an enhanced PBH production due to the abrupt softening of the equation-of-state parameter.
Article
Astronomy & Astrophysics
Suvodip Mukherjee, Tom Broadhurst, Jose M. Diego, Joseph Silk, George F. Smoot
Summary: A new method for estimating the event rate of strongly lensed systems by exploring the amplitude of the stochastic gravitational wave background has been proposed. Ongoing and future analysis of data from the Laser Interferometer Gravitational-wave Observatory (LIGO)-Virgo can help impose stringent bounds on the lensing event rate, and combining measurements of loud GW events with an unresolved stochastic background detection will improve estimates of lensed events at high redshift. This proposed method will play a crucial role in understanding the population of lensed and unlensed systems from GW observations.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Giorgio Orlando, Mauro Pieroni, Angelo Ricciardone
Summary: This paper explores the possibility of detecting circular polarization of an isotropic Stochastic Gravitational Wave Background by cross-correlating two space-based detectors, LISA and Taiji, and finds that a clear measurement of chirality can be claimed for a maximally chiral flat signal with specific amplitude at the frequency scales of LISA and Taiji.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
Giorgio Mentasti, Marco Peloso
Summary: This study focuses on the sensitivity of a pair of Einstein Telescopes under specific conditions to the anisotropies of the Stochastic Gravitational Wave Background (SGWB), revealing simple analytic expressions for interferometer overlap functions and dependence of SGWB multipoles sensitivity on the latitude and longitude difference of the two sites.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
Federico De Lillo, Jishnu Suresh, Andrew L. Miller
Summary: Rotating neutron stars are potential sources of gravitational waves in the frequency range detectable by ground-based detectors. By measuring the stochastic gravitational-wave background created by the superposition of signals from individually undetectable neutron stars, properties such as the average ellipticity can be determined.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Optics
Guillaume Vanderhaegen, Pascal Szriftgiser, Alexandre Kudlinski, Andrea Armaroli, Matteo Conforti, Stefano Trillo, Arnaud Mussot
Summary: We report the observation of parametric gain band distortion in the nonlinear regime of modulation instability in dispersion oscillating fibers. We show that the maximum gain is shifted beyond the boundaries of the linear parametric gain band. Experimental findings are validated using numerical simulations.
Article
Astronomy & Astrophysics
Takehiko Asaka, Hisashi Okui
Summary: This study investigates the generation of tiny neutrino masses in the Standard Model through the seesaw mechanism, focusing on the case when one right-handed neutrino has suppressed Yukawa coupling constants. The long-lived right-handed neutrino can produce additional entropy by decay, impacting the gravitational wave background originated in the primordial inflation. Probing the mass and coupling constants of the long-lived right-handed neutrino can provide information on the mass of the lightest active neutrino.
Article
Astronomy & Astrophysics
D. Poletti
Summary: This study focuses on the standard methodologies for extracting SGWB from interferometric signals, involving the use of filter functions to maximize SNR. It derives expressions for optimal filter and SNR in the presence of target SGWB and other unwanted components, and generalizes the methodology to template-free reconstruction. The formalism allows for easy analysis and forecasting while marginalizing foreground signals.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
E. Arbuzova, A. Dolgov
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2017)
Article
Physics, Particles & Fields
E. V. Arbuzova, A. D. Dolgov, L. Reverberi
EUROPEAN PHYSICAL JOURNAL C
(2018)
Article
Astronomy & Astrophysics
E. V. Arbuzov, A. D. Dolgov, R. S. Singh
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2018)
Article
Physics, Nuclear
E. V. Arbuzova
INTERNATIONAL JOURNAL OF MODERN PHYSICS A
(2018)
Article
Astronomy & Astrophysics
E. Arbuzova, A. D. Dolgov, R. S. Singh
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2019)
Article
Astronomy & Astrophysics
Lorenzo Reverberi, David Daverio
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2019)
Article
Physics, Particles & Fields
E. Arbuzova, A. D. Dolgov
PHYSICS OF PARTICLES AND NUCLEI
(2019)
Article
Physics, Nuclear
E. Arbuzova
INTERNATIONAL JOURNAL OF MODERN PHYSICS A
(2020)
Article
Physics, Nuclear
E. Arbuzova
INTERNATIONAL JOURNAL OF MODERN PHYSICS A
(2020)
Article
Astronomy & Astrophysics
E. Arbuzova
Summary: The study explores the process of particle creation in the Starobinsky inflationary model for different decay channels of the scalaron, showing that thermalization can lead to the creation of superheavy stable particles with coupling strengths typical for GUT SUSY, matching the observed density of dark matter.
INTERNATIONAL JOURNAL OF MODERN PHYSICS D
(2021)
Review
Multidisciplinary Sciences
Elena Arbuzova, Alexander Dolgov, Rajnish Singh
Summary: The study shows that the evolution of the universe in R-2-modified gravity can be separated into four epochs: inflation, heating due to curvature oscillations, transition to matter-dominated period, and conventional cosmology governed by General Relativity. It also calculates the cosmological density of dark matter particles for different decay channels of a scalaron, and derives bounds on the masses of dark matter particles for dominant decay modes.
Article
Multidisciplinary Sciences
Elena Arbuzova, Alexander Dolgov, Koushik Dutta, Raghavan Rangarajan
Summary: This paper investigates a possible mechanism of gravitational baryogenesis and proposes a stabilization method for GBG by introducing an R2 term. The study finds that this mechanism can stabilize GBG with both bosonic and fermionic baryon currents, and establishes the parameter space for the stabilization of R. However, it also leads to significant modifications in standard cosmology.
Article
Physics, Particles & Fields
E. V. Arbuzova, A. D. Dolgov, R. S. Singh
EUROPEAN PHYSICAL JOURNAL C
(2020)
Article
Physics, Particles & Fields
E. V. Arbuzova
PHYSICS OF PARTICLES AND NUCLEI LETTERS
(2018)
