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111 papers · 1 filter
CMB anisotropies due to cosmological magnetosonic waves
Tina Kahniashvili, Bharat Ratra
We study scalar mode perturbations (magnetosonic waves) induced by a helical stochastic cosmological magnetic field and derive analytically the corresponding cosmic microwave backg…
The periodic oscillation of an adiabatic piston in two or three dimensions
Paul Wright
We study a heavy piston of mass that separates finitely many ideal, unit mass gas particles moving in two or three dimensions. Neishtadt and Sinai previously determined a metho…
A new REM conjecture
Gerard Ben Arous, Veronique Gayrard, Alexey Kuptsov
We introduce here a new universality conjecture for levels of random Hamiltonians, in the same spirit as the local REM conjecture made by S. Mertens and H. Bauke. We establish our…
Delocalization from Anomaly Inflow and Intersecting Brane Dynamics
Luca Grisa
We study intersecting D-brane models, that describe at low energies a two dimensional chiral fermion theory localized at the intersection. The fermions are coupled to gauge fields…
Domain Walls As Probes Of Gravity
Gia Dvali, Gregory Gabadadze, Oriol Pujolas +1
We show that domain walls are probes that enable one to distinguish large-distance modified gravity from general relativity (GR) at short distances. For example, low-tension domain…
Causality Constrains Higher Curvature Corrections to Gravity
A. Gruzinov, M. Kleban
We show that causality constrains the sign of quartic Riemann corrections to the Einstein-Hilbert action. Our constraint constitutes a restriction on candidate theories of quantum…