117 citations · 1.2k across the 42 of their papers we have counts for
31 papers · 1 filter
Stress-Energy Tensor of a Scalar Field on a Product Spacetime with a Time-Dependent Compact Dimension
Anamitra Paul, Sonia Paban
We compute the vacuum expectation value of the stress-energy tensor of a scalar field on a product spacetime composed of an FLRW background times a compact dimension ($\mathcal{M}^…
Rapid-turn inflation in supergravity is rare and tachyonic
Vikas Aragam, Roberta Chiovoloni, Sonia Paban +2
Strongly non-geodesic, or rapidly turning trajectories in multifield inflation have attracted much interest recently from both theoretical and phenomenological perspectives. Most m…
The Multi-Field, Rapid-Turn Inflationary Solution
Vikas Aragam, Sonia Paban, Robert Rosati
There are well-known criteria on the potential and field-space geometry for determining if slow-roll, slow-turn, multi-field inflation is possible. However, even though it has been…
Multi-field Inflation in High-Slope Potentials
Vikas Aragam, Sonia Paban, Robert Rosati
We present two families of multi-field potentials that support inflation while satisfying the refined de Sitter and the distance swampland conjectures. Both families feature Planck…
Generalized surface tension bounds in vacuum decay
Ali Masoumi, Sonia Paban, Erick J. Weinberg
Coleman and De Luccia (CDL) showed that gravitational effects can prevent the decay by bubble nucleation of a Minkowski or AdS false vacuum. In their thin-wall approximation this h…
Robustness of Inflation to Inhomogeneous Initial Conditions
Katy Clough, Eugene A. Lim, Brandon S. DiNunno +3
We consider the effects of inhomogeneous initial conditions in both the scalar field profile and the extrinsic curvature on different inflationary models. In particular, we compare…
Tunneling from a Minkowski vacuum to an AdS vacuum: A new thin-wall regime
Ali Masoumi, Sonia Paban, Erick J. Weinberg
Using numerical and analytic methods, we study quantum tunneling from a Minkowski false vacuum to an anti-de Sitter true vacuum. Scanning the parameter space of theories with quart…
Tunneling in Theories with Many Fields
Michael Dine, Sonia Paban
The possibility of a landscape of metastable vacua raises the question of what fraction of vacua are truly long lived. Naively any would-be vacuum state has many nearby decay paths…
Analyzing Multi-Field Tunneling With Exact Bounce Solutions
Aditya Aravind, Brandon S. DiNunno, Dustin Lorshbough +1
We study multi-field tunneling using exact solutions for additive potentials. We introduce a binomial potential with non-integer powers that could be considered a generalization of…
Lower Bound for the Multi-Field Bounce Action
Aditya Aravind, Dustin Lorshbough, Sonia Paban
We present a lower bound for the multi-field bounce action with a quartic potential in the absence of gravity. We find that for a large number of fields the lower bound decreases w…
Power Spectrum and Non-Gaussianities in Anisotropic Inflation
Anindya Dey, Ely D. Kovetz, Sonia Paban
We study the planar regime of curvature perturbations for single field inflationary models in an axially symmetric Bianchi I background. In a theory with standard scalar field acti…
Non-Gaussianity from Excited Initial Inflationary States
Aditya Aravind, Dustin Lorshbough, Sonia Paban
We study squeezed limit generation by excited initial inflationary states in a model independent way. We restrict "excited" to mean a Bogoliubov transformation of the Bunc…
Rapid field excursions and the inflationary tensor spectrum
Daniel Carney, Willy Fischler, Ely D. Kovetz +2
We consider the effects of fields with suddenly changing mass on the inflationary power spectra. In this context, when a field becomes light, it will be excited. This process contr…
The Inflationary Wavefunction and its Initial Conditions
Daniel Carney, Willy Fischler, Sonia Paban +1
We explore the effect of initial conditions on the inflationary wavefunction and their consequences for the observed spectrum of primordial fluctuations. In a class of models with…
Non-Gaussianities in the Cosmological Perturbation Spectrum due to Primordial Anisotropy
Anindya Dey, Sonia Paban
We investigate possible signatures of a pre-inflationary anisotropic phase in two-point and three-point correlation functions of the curvature perturbation for high-momentum modes…
On Slow-roll Moduli Inflation in Massive IIA Supergravity with Metric Fluxes
Raphael Flauger, Sonia Paban, Daniel Robbins +1
We derive several no-go theorems in the context of massive type IIA string theory compactified to four dimensions in a way that, in the absence of fluxes, preserves N=1 supersymmet…
Perturbation Growth in Anisotropic Cosmologies
E. Dimastrogiovanni, W. Fischler, S. Paban
We study the growth of perturbations in an expanding Bianchi type-I metric that evolves according to an energy density that includes dust and a cosmological constant. Assuming an e…
Vacuum Bubble in an Inhomogeneous Cosmology
Willy Fischler, Chethan Krishnan, Sonia Paban +1
We study the propagation of bubbles of new vacuum in a radially inhomogeneous Lemaitre-Tolman-Bondi background that includes a cosmological constant. This exemplifies the classical…
Leptogenesis from Pseudo-Scalar Driven Inflation
W. Fischler, S. Paban
We examine recent claims for a considerable amount of leptogenesis, in some inflationary scenarios, through the gravitational anomaly in the lepton number current. We find that whe…
Evolution of Gravitationally Unstable de Sitter Compactifications
C. Krishnan, S. Paban, M. Zanic
We study the time evolution of unstable \times configurations with flux in theories of gravity with a cosmological constant. For certain values of the flux, we identif…
The Entropy of the Microwave Background and the Acceleration of the Universe
W. Fischler, A. Loewy, S. Paban
If the present acceleration of the universe is due to a cosmological constant, λ, then the entropy of the microwave background is bounded. It cannot exceed λ^{-3/4} \sim 10^{91}, w…
Recurrent Nightmares?: Measurement Theory in de Sitter Space
T. Banks, W. Fischler, S. Paban
The idea that asymptotic de Sitter space can be described by a finite Hilbert Space implies that any quantum measurement has an irreducible innacuracy. We argue that this prevents…
Non-commutativity and Supersymmetry
Sonia Paban, Savdeep Sethi, Mark Stern
We study the extent to which the gauge symmetry of abelian Yang-Mills can be deformed under two conditions: first, that the deformation depend on a two-form scale. Second, that the…
Evidence for Winding States in Noncommutative Quantum Field Theory
W. Fischler, Joaquim Gomis, E. Gorbatov +3
We study noncommutative field theories at finite temperature to learn more about the degrees of freedom in the non-planar sector of these systems. We find evidence for winding stat…