Savastano, Stefano Vernizzi, Filippo Zumalacárregui, Miguel

Once detected, lensed gravitational waves will afford new means to probe the matter distribution in the universe, complementary to electromagnetic signals. Sources of continuous gravitational waves (CWs) are long-lived and stable, making their lensing signatures synergic to short mergers of compact binaries. CWs emitted by isolated neutron stars an...

Bjerrum-Bohr, N. Emil J. Planté, Ludovic Vanhove, Pierre

In this chapter, we will review the field-theoretic treatment of General Relativity based on an effective field theory extension of the Einstein-Hilbert action. This pragmatic route to low-energy quantum effects in gravity critically underpins miscellaneous investigations of phenomenological and quantum extensions of General Relativity. We discuss ...

Marconnet, Paul Tsimpis, Dimitrios

We study 4d Friedmann-Lemaître-Robertson-Walker cosmologies obtained from time-dependent compactifications of Type IIA 10d supergravity on various classes of 6d manifolds (Calabi-Yau, Einstein, Einstein-Kähler). The cosmologies we present are universal in that they do not depend on the detailed features of the compactification manifold, but only on...

Kiritsis, Elias Litos, Christos

Holographic RG flows dual to QFTs on a squashed $S^3$ are considered in the framework of Einstein dilaton gravity in four dimensions. A general dilaton potential is used and flows are driven by a scalar relevant operator. The general properties of such flows are analysed and the UV and IR asymptotics are computed. Exotic asymptotics are found, that...

Cano, Pablo A. Ganchev, Bogdan Mayerson, Daniel Ruipérez, Alejandro

We consider a broad family of higher-derivative extensions of four-dimensional Einstein gravity and study the multipole moments of rotating black holes therein. We carefully show that the various definitions of multipoles carry over from general relativity, and compute these multipoles for higher-derivative Kerr using the ACMC expansion formalism. ...

Joyce, Michael Pohan, Azrul

The separable analytical solution in standard perturbation theory for an Einstein de Sitter (EdS) universe can be generalized to the wider class of such cosmologies ("generalized EdS", or gEdS) in which a fraction of the pressure-less fluid does not cluster. We derive the corresponding kernels in both Eulerian perturbation theory (EPT) and Lagrangi...

Tomczyk, Hannah
Published in
Studies in history and philosophy of science

The successful prediction of new phenomena by scientific theories has gained much interest in philosophy. I will discuss a case that is often taken to be such a successful prediction within physics: Bose-Einstein condensation. The common story goes: the phenomenon was predicted in 1925 by Einstein, and the prediction was confirmed in 1995 at JILA ...

Langlois, David Noui, Karim Roussille, Hugo

We study linear perturbations about non rotating black hole solutions in scalar-tensor theories, more specifically Horndeski theories. We consider two particular theories that admit known hairy black hole solutions. The first one, Einstein-scalar-Gauss-Bonnet theory, contains a Gauss-Bonnet term coupled to a scalar field, and its black hole solutio...

Leonardi, Alessio Mattia Mobilio, Settimio Fazio, Claudio
Published in
Physics Education

Special Relativity introduces students to Modern Physics, whose importance in the high school is increasing. Nevertheless its teaching and learning is a critical issue. Different solutions have been developed to overcome the encountered difficulties. In this paper we describe the spacetime globe, a mechanical instrument that allows to experience Sp...

Antoniadis, Ignatios Guillen, Anthony Tamvakis, Kyriakos
Published in
Journal of High Energy Physics

We study the ultraviolet behaviour of Higgs inflation models above the apparent unitarity violation scale arising from the large non minimal coupling to gravity, by computing on-shell 4-point scattering amplitudes in the presence of a large inflaton background, away from the electroweak vacuum. We find that all tree-level amplitudes are well behave...