125 citations · 300 across the 20 of their papers we have counts for
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Islands in Bianchi type-I Universe
Ido Ben-Dayan, Merav Hadad, Ayushi Srivastava
We study the conditions for finding an island in an anisotropic universe - Bianchi Type-I filled with radiation. We verify that the existence of islands does not depend on their sh…
Islands in the Fluid: Islands are Common in Cosmology
Ido Ben-Dayan, Merav Hadad, Elizabeth Wildenhain
We discuss the possibility of entanglement islands in cosmological spacetimes with a general perfect fluid with an equation of state . We find that flat universes with time-symm…
Proposed evolution in Marolf-Maxfield toy model obtained through correspondence to spontaneous collapse theory
Merav Hadad
The Marolf-Maxfield topological toy model for 2D gravity gives the full spectrum of boundary theories, but can not describe any evolution. In order to obtain the expected evolution…
The Grand Canonical Multiverse and the Small Cosmological Constant
Ido Ben-Dayan, Merav Hadad, Amir Michaelis
We consider the Multiverse as an ensemble of universes. Using standard statistical physics analysis we get that the Cosmological Constant (CC) is exponentially small. The small and…
Thermodynamical Interpretation of the Second Law for Cosmology
Ido Ben-Dayan, Merav Hadad
The area of a future holographic screen increases monotonically. Associating this area with entropy results in a generalized second law for Cosmology (GSLC). Unlike black hole hori…
Derivation of Hamilton-like equations on a non-Cauchy hypersurface and their expected connection to quantum gravity theories
Merav Hadad, Levy Rosenblum
Recently it was found that quantum gravity theories may involve constructing a quantum theory on non-Cauchy hypersurfaces. However this is problematic since the ordinary Poisson br…
Non-Cauchy surface foliations and their expected connection to quantum gravity theories
Merav Hadad
We argue that quantum gravity theories should involve constructing a quantum theory on non-Cauchy hypersurfaces and suggest that the hypersurface direction should be the same as th…
Wave function of the quantum black hole
Ram Brustein, Merav Hadad
We show that the Wald Noether charge entropy is canonically conjugate to the opening angle at the horizon. Using this canonical relation we extend the Wheeler-DeWitt equation to a…
Evaluating the Wald Entropy from two-derivative terms in quadratic actions
Ram Brustein, Dan Gorbonos, Merav Hadad +1
We evaluate the Wald Noether charge entropy for a black hole in generalized theories of gravity. Expanding the Lagrangian to second order in gravitational perturbations, we show th…
The Einstein equations for generalized theories of gravity and the thermodynamic relation are equivalent
Ram Brustein, Merav Hadad
We show that the equations of motion of generalized theories of gravity are equivalent to the thermodynamic relation . Our proof relies on extending previous arguments b…
Wald's entropy is equal to a quarter of the horizon area in units of the effective gravitational coupling
Ram Brustein, Dan Gorbonos, Merav Hadad
The Bekenstein-Hawking entropy of black holes in Einstein's theory of gravity is equal to a quarter of the horizon area in units of Newton's constant. Wald has proposed that in gen…
Particle production in string cosmology models
Ram Brustein, Merav Hadad
We compute spectra of particles produced during a dilaton-driven kinetic inflation phase within string cosmology models. The resulting spectra depend on the parameters of the model…