9 papers
Size, shape, density, and atmospheric limit of (50000) Quaoar revealed from 14 years of stellar occultation
Giuliano Margoti, Felipe Braga-Ribas, José Luis Ortiz +173
We present results from 28 stellar occultations by the large Trans-Neptunian Object (50000) Quaoar registered between 2018 and 2025. By performing a joint analysis of this occultat…
Exciting the Vacuum: Non-Thermal Particle Bursts and Multi-Messenger Signals from Binary Black Holes
Sohrab Rahvar
We investigate particle production in the dynamical curved spacetime of a binary black hole system. Particle production is a well-known feature of quantum field theory in curved sp…
Cosmological Tensions in a Gauge-Invariant Modified Gravity
Zahra Tabatabaei, Sohrab Rahvar, Shahin Rouhani
In this work, we investigate a gauge-invariant formulation of modified gravity (GIMOG) wherein the gravitational interaction emerges dynamically from a scalar field following a fir…
The Oort Cloud as a Gravitational Detector for Primordial Black Holes
Sohrab Rahvar
Planetary systems can act as sensitive gravitational detectors for dark matter. We investigate the gravitational scattering of Oort cloud objects by primordial black holes (PBHs) a…
Constraining the Lifespan of Intelligent Technological Civilization in the Galaxy
Sohrab Rahvar, Shahin Rouhani
In this work, we explore constraints on the emergence and longevity of technologically intelligent civilizations in our Galaxy, considering the Fermi paradox. We argue that under o…
Addressing Dipole Tension via Clustering in CDM and beyond
Arefeh Daei Rasouli, Haniyeh S. Tadayyoni, Shant Baghram +1
The dipole in the angular distribution of the cosmic microwave background (CMB) is attributed to the Doppler effect and our motion relative to the CMB rest frame. It is expected th…