Cmb targets after planck

**gravitational**

**waves**produced during inflation.

4/10 relevant

arXiv

Simplified optical configuration for a sloshing-speedmeter-enhanced
**gravitational** **wave** detector

**gravitational**

**wave**detector based on the speedmeter concept using a sloshing cavity. Expand abstract.

**gravitational**

**wave**detector based on the speedmeter concept using a sloshing cavity. Speedmeters provide an inherently better quantum-noise limited sensitivity at low frequencies than the currently used Michelson interferometers. We show that a practical sloshing cavity can be added relatively simply to an existing dual-recycled Michelson interferometer such as Advanced LIGO.

7/10 relevant

arXiv

**Gravitational** **wave** and collider signals in complex two-Higgs doublet
model with dynamical CP-violation at finite temperature

**Gravitational**

**wave**in complementary to collider signals can help to pin down the underlying phase transition dynamics or different patterns. Expand abstract.

**gravitational**

**wave**signals in synergy with the collider signals at future lepton colliders. For some parameter spaces, various phase transition patterns can occur, such as the multi-step phase transition and supercooling.

**Gravitational**

**wave**in complementary to collider signals can help to pin down the underlying phase transition dynamics or different patterns.

7/10 relevant

arXiv

The high-energy collision of black holes in higher dimensions

**gravitational**

**wave**energy $E_{\rm rad}$ radiated in head-on collisions of equal-mass, nonspinning black holes in up to $D=8$ dimensional asymptotically flat spacetimes for boost velocities $v$ up to about $90\,\%$ of the speed of light. We identify two main regimes: Weak radiation at velocities up to about $40\,\%$ of the speed of light, and exponential growth of $E_{\rm rad}$ with $v$ at larger velocities. Extrapolation to the speed of light predicts a limit of $12.9\,\%$ $(10.1,~7.7,~5.5,~4.5)\,\%$. of the total mass that is lost in

**gravitational**

**waves**in $D=4$ $(5,\,6,\,7,\,8)$ spacetime dimensions. In agreement with perturbative calculations, we observe that the radiation is minimal for small but finite velocities, rather than for collisions starting from rest. Our computations support the identification of regimes with super Planckian curvature outside the black-hole horizons reported by Okawa, Nakao, and Shibata [Phys.~Rev.~D {\bf 83} 121501(R) (2011)].

7/10 relevant

arXiv

Testing BEC Dark Matter with **Gravitational** **Waves**

7/10 relevant

arXiv

Measuring the neutron star equation of state with **gravitational** **waves**:
the first forty binary neutron star mergers

**Gravitational**

**waves**from binary neutron star coalescences contain rich information about matter at supranuclear densities encoded by the neutron star equation of state. We can measure the equation of state by analyzing the tidal interactions between neutron stars, which is quantified by the tidal deformability. Multiple merger events are required to probe the equation of state over a range of neutron star masses. The more events included in the analysis, the stronger the constraints on the equation of state. In this paper, we build on previous work to explore the constraints that LIGO and Virgo are likely to place on the neutron star equation of state by combining the first forty binary neutron star detections, a milestone we project to be reached during the first year of accumulated design-sensitivity data. We carry out Bayesian inference on a realistic mock dataset of binaries to obtain posterior distributions for neutron star tidal parameters. In order to combine posterior samples from multiple observations, we employ a random forest regressor, which allows us to efficiently interpolate the likelihood distribution. Assuming a merger rate of 1540 Gpc$^{-3}$ yr$^{-1}$ and a LIGO-Virgo detector network operating for one year at the sensitivity of the third-observation run, plus an additional eight months of design sensitivity, we find that the radius of a 1.4 $M_\odot$ neutron star can be constrained to $\sim 10$% at 90% confidence. At the same time, the pressure at twice the nuclear saturation density can be constrained to $\sim 45$ % at 90% confidence.

10/10 relevant

arXiv

Waveform of **gravitational** **waves** in the ghost-free parity-violating
gravities

**Gravitational**

**waves**(GWs) provide an excellent opportunity to test the gravity in the strong

**gravitation**al fields. Expand abstract.

**Gravitational**

**waves**(GWs) provide an excellent opportunity to test the gravity in the strong

**gravitational**fields. In this article, we calculate the waveform of GWs, produced by the coalescence of compact binaries, in the general ghost-free parity-violating gravities. By comparing the two circular polarization modes, we find the effects of amplitude birefringence and velocity birefringence of GWs caused by the parity violation in gravity, which are explicitly presented in the GW waveforms by the amplitude and phase modifications respectively. Combining the two modes, we obtain the GW waveforms in the Fourier domain, and find that the deviations from those in General Relativity are dominated by effects of velocity birefringence of GWs.

10/10 relevant

arXiv

**Gravitational** **Waves** as a Probe of Left-Right Symmetry Breaking

**gravitational**

**wave**background induced by the phase transition in which $SU(3)_C \times SU(2)_L \times SU(2)_R \times U(1)_{B-L}$ is broken down to the Standard Model gauge symmetry group. A prerequisite for

**gravitational**

**wave**production in this context is a first-order phase transition, the occurrence of which we find in a significant portion of the parameter space. Although the produced

**gravitational**

**waves**are typically too weak for a discovery at any current or future detector, upon investigating correlations between all relevant terms in the scalar potential, we have identified values of parameters leading to observable signals. This indicates that, given a certain moderate fine-tuning, the minimal left-right symmetric model with scalar triplets features another powerful probe which can lead to either novel constraints or remarkable discoveries in the near future. Let us note that some of our results, such as the full set of thermal masses, have to the best of our knowledge not been presented before and might be useful for future studies, in particular in the context of electroweak baryogenesis.

10/10 relevant

arXiv

Electroweak phase transition with composite Higgs models: calculability,
**gravitational** **waves** and collider searches

**gravitational**

**waves**prediction and the related collider phenomenology.

10/10 relevant

arXiv

Analytic Waveforms for Eccentric **Gravitational** **Wave** Bursts

**wave**forms designed to accurately capture the burst of

**gravitational**radiation from the closest approach of highly eccentric compact binaries. Expand abstract.

**gravitational**radiation from the closest approach of highly eccentric compact binaries. The waveforms are constructed by performing a re-summation procedure on the well-known Fourier series representation of the two-body problem at leading post-Newtonian order. This procedure results in two models: one in the time-domain, and one in the Fourier domain, which makes use of the stationary phase approximation. We discuss the computational efficiency of both these models, and validate the time domain model against numerical waveforms. We further show how to use these individual waveforms to detect a repeated burst source.

5/10 relevant

arXiv