Abbott, B.P. Abbott, R. Abbott, T.D. Acernese, F. Ackley, K. Adams, C. Adams, T. Addesso, P. Adhikari, R.X. Adya, V.B.
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One unanswered question about the binary neutron star coalescence GW170817 is the nature of its post-merger remnant. A previous search for post-merger gravitational waves targeted high-frequency signals from a possible neutron star remnant with a maximum signal duration of 500 s. Here we revisit the neutron star remnant scenario with a focus on lon...

Tucker, Alexandria Will, Clifford

The advance of the pericenter of the orbit of a test body around a massive body is a standard textbook topic in general relativity. It can be calculated in a number of ways. In one method, one studies the geodesic equation in the exact Schwarzschild geometry and finds the angle between pericenters as an integral of a certain radial function between...

Abbott, T.M.C. Abdalla, F.B. Avila, S. Banerji, M. Baxter, E. Bechtol, K. Becker, M.R. Bertin, E. Blazek, J. Bridle, S.L.
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We present constraints on extensions of the minimal cosmological models dominated by dark matter and dark energy, $\Lambda$CDM and $w$CDM, by using a combined analysis of galaxy clustering and weak gravitational lensing from the first-year data of the Dark Energy Survey (DES Y1) in combination with external data. We consider four extensions of the ...

Abbott, T.M.C. Abdalla, F.B. Avila, S. Banerji, M. Baxter, E. Bechtol, K. Becker, M.R. Bertin, E. Blazek, J. Bridle, S.L.
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We present constraints on extensions of the minimal cosmological models dominated by dark matter and dark energy, $\Lambda$CDM and $w$CDM, by using a combined analysis of galaxy clustering and weak gravitational lensing from the first-year data of the Dark Energy Survey (DES Y1) in combination with external data. We consider four extensions of the ...

Boisseau, B. Giacomini, H.

Recently a class of inflationary models satisfying the constant rate of roll constraint, $\ddot{\phi}+(3+\alpha)H\dot{\phi}=0$, has been studied and compared with the latest cosmological observational data. We consider the broader class of constraints $ \ddot{\phi}+\frac{\alpha_1}{2}\dot{\phi}+\alpha_2 H\dot{\phi}=0$ and find an exact solution, whi...

Khodnevych, Vitalii di Pace, Sibilla Vinet, Jean-Yves Dinu-Jaeger, Nicoleta Lintz, Michel

We describe a setup based on Michelson interferometry for coherent measurements of the backscattered light from a low roughness optical surface under test. Special data processing was developed for the extraction of the useful signal from the various stray contributions to the coherent signal. We achieve coherent detection of light scattered by a m...

Cárdenas, Marcela Fuentealba, Oscar Grumiller, Daniel Valcárcel, Carlos Vassilevich, Dmitri

The $\mathfrak{osp}(2,N)$-BF formulation of dilaton supergravity in two dimensions is considered. We introduce a consistent class of asymptotic conditions preserved by the extended superreparametrization group of the thermal circle at infinity. In the $N=1$ and $N=2$ cases the phase space foliation in terms of orbits of the super-Virasoro group all...

Deledicque, Vincent

Recently, a new model based on the theory of general relativity has been developed to analyze the structure of spiral galaxies. More specifically, the analytical stationary solution of an axisymmetric rotating pressureless fluid for the linearized equations of the theory of general relativity was determined. It has been shown that this model can ex...

Fayet, Pierre

Extremely weak new forces could lead to apparent violations of the Equivalence Principle. The MICROSCOPE experiment implies that the relative strength of a new long-range force, compared with gravity, is constrained to $|\bar\alpha_g|10^{12}$. This points to a $\sqrt \xi \approx 10^{16}$ GeV scale, associated with a huge vacuum energy density that ...

Quintin, Jerome Brandenberger, Robert Gasperini, Maurizio Veneziano, Gabriele

We discuss the properties of the gas of primordial `stringy' black holes possibly formed in the high-curvature phase preceding the bouncing transition to the phase of standard cosmological evolution. We show that the regime dominated by such a string hole gas can be consistently described by explicit solutions of the string effective action includi...