601 talks across 60 sessions. Search by title, author or full text.
601 results
The large-scale B-mode polarization of the Cosmic Microwave Background (CMB) holds immense potential for revealing high-energy physics from the early Universe. Detecting this signature would likely indicate the emission of primordial gravitational waves follow…
The purpose of this work is to study the orbital evolution under the combined effect of disk-drag and GW-emission for E/IMRIs endowed with accretion disk. We study the dependence of disk-torque and GW-torque on the orbital parameters of compact companions. We…
220072 Minsk, Belarus 3 ICRANet, Piazza della Repubblica, 10, 65122 Pescara, Italy; ICRA, Dipartimento di Fisica, Sapienza Universit\‘a di Roma, Piazzale Aldo Moro 5, I-00185 Rome, Italy; INAF —IAPS, Via del Fosso del Cavaliere, 100, 00133 Rome, Italy 4 Belaru…
The Einstein–Maxwell and the electrodynamical equations are written for a (d+1)-dimensional FRW- like spacetime in the presence of plasma with the help of a wellknown (3 + 1) decomposition formalism given by Thorne and Macdonald. Actually this work is the gene…
220072 Minsk, Belarus 3 ICRANet, Piazza della Repubblica, 10, 65122 Pescara, Italy; ICRA, Dipartimento di Fisica, Sapienza Universit\‘a di Roma, Piazzale Aldo Moro 5, I-00185 Rome, Italy; INAF —IAPS, Via del Fosso del Cavaliere, 100, 00133 Rome, Italy 4 Belaru…
International Centre for Theoretical Sciences, Tata Institute for Fundamental Sciences, Bengaluru 560089, Karnataka, India 3 Institute for Theoretical Physics and Center for Extreme Matter and Emergent Phenomena, Utrecht University, 3508 TD Utrecht, The Nether…
Black hole solutions in General Relativity are parametrized by their mass, spin and charge. In this talk, I will motivate why the charge of black holes adds interesting dynamics to solutions of the Einstein equation thanks to the interaction between gravitatio…
It has been long known that the static Ellis-Bronnikov wormholes of GR are radially unstable. Here we study the radial perturbations of these wormholes in slow rotation up to second order. We find that rotation can potentially stabilize the unstable mode of th…
In this talk we present the analysis of a large class of extended mimetic gravity Lagrangians, which allow the embedding of the Lemaître-Tolman-Bondi (LTB) models in spherically symmetric spacetimes. Using the LTB embedding, we are able to completely decouple…
In this presentation, I will discuss about the unhindered gravitational collapse of spatially homogeneous (SH) scalar fields ϕ with a potential Vs(ϕ), as well as vector fields à with a potential Vv(B) where B = g(Ã, Ã) and g is the metric tensor. If the pas…
We evaluate the surface energy~(calE± s ), rotational energy~(calE± r ) and electromagnetic energy~(calE± em) for a Kerr-Sen black hole~(BH) having the event horizon~(calH+ ) and the Cauchy horizon~(calH− ). Interestingly, we find that the sum of these three e…
Quantum entanglement harvesting (EH) in the relativistic setup has recently attracted much attention. The formulation studies the possibility of two uncorrelated Unruh-DeWitt detectors getting entangled over time due to the effects of quantum vacuum fluctuatio…
We discuss the entanglement entropy for a massive Klein-Gordon field in two Schwarzschild-like quantum black hole spacetimes, also including a nonminimal coupling term with the background scalar curvature. To compute the entanglement entropy, we start from the…
We define an entropy product function (EPF) for Taub-Newman-Unti-Tamburino(TNUT) black hole(BH) following the prescription suggested by Wu et al. [PRD 100, 101501(R) (2019)]. The prescription argues that a generic four-dimensional TNUT spacetime might be expre…
One of the best known interactions between quantum field theory and general relativity is the way that horizons gain an associated entropy, given by an area law. Entanglement entropy is a particularly promising candidate as the source of this entropy, and prov…
Goddard Space Flight Center As current space-based gamma-ray instruments such as Fermi begin to show their age, it is time to think about the next generation and the overall future of gamma-ray astronomy in space. To help start the process, NASA has commission…
) Human’s perception and philosophy of the cosmos depend on our collective sensors. Modern optical sky surveys in the 20th century gave rise to the concept of dynamic Universe, one mysterious manifestation of which is fast radio bursts (FRBs). Look like a radi…
On June 9th, we received the news of the passing of Professor Manuel Malheiro. Malheiro was not only a colleague and advisor, but also a friend. This presentation covers our last work together and represents my homage to him. The lack of isolated neutron stars…
Neutron stars are one of the most suitable environments for probing physics under extreme states. For example, the quasi-periodic oscillations (QPOs) observed in a giant flare occurred in a strongly magnetized neutron star (magnetar), are carrying crucial info…
I will discuss eternal inflation and the key role that inflation plays in resolving cosmological singularities. I will describe how proposed no-go theorems, such as the famous theorem of Borde, Guth and Vilenkin (BGV) are circumvented or obviated. Our explorat…
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3XMM J185246.6+003317 is a transient magnetar located in the vicinity of the supernova remnant Kes\,79. So far, observations have only set upper limits to its surface magnetic field and spindown, and there is no estimate for its mass and radius. Using ray-trac…
In this talk, I will present and discuss evidence for cocoon emission in the early afterglow emission phases of the nearby GRB-SN 171205A. Special attention will be given to the multi-wavelength analysis, and to modeling of the cocoon component. Extended theor…
The second brightest GRB in history, GRB230307A provides an ideal laboratory to study the details of GRB prompt emission thanks to its extraordinarily high photon statistics and its single broad pulse overall shape characterized by an energy-dependent fast-ris…
The first spectral images of the environment surrounding SgrAsuggested the co-existence of thermalized plasma with extended regions showing the typical spectrum of a “cold”matter irradiated by a flux of hard X-Ray. In 2002 E.Churazov, R.Sunyaev and S.Sozonov p…