154 citations · 618 across the 22 of their papers we have counts for
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Notes on Quantum Effective Actions
S. P. de Alwis
We first note that, at least in perturbation theory, there is a well-defined (subject to regularization) Lorentzian definition of the quantum effective action in both flat and curv…
Radiative Generation of dS from AdS
S. P. de Alwis
The large volume scenario (LVS) of type IIB string compactifications has a robust supersymmetry breaking minimum with a negative cosmological constant (CC). We argue that radiative…
Wilsonian Effective Field Theory and String Theory
S. P. de Alwis
We argue that deriving an effective field theory from string theory requires a Wilsonian perspective with a physical cutoff. Employing proper time regularization we demonstrate the…
Higher Derivative Corrections to Lower Order RG Flow Equations
S. P. de Alwis
We show that the RG flow equation for the cosmological constant (CC) receives contributions (in addition to those coming from the CC the Einstein-Hilbert term and and $R_{μ…
De Sitter vs Quintessence in String Theory
Michele Cicoli, Senarath de Alwis, Anshuman Maharana +2
De Sitter solutions have been recently conjectured to be incompatible with quantum gravity. In this paper we critically assess the progress and challenges of different mechanisms t…
One PI and Wilsonian Actions in SUSY theories
S. P. de Alwis
The soft breaking terms in supersymmetric theories are calculated at some high scale characterizing the hidden supersymmetry breaking sector, and then evolved down to the TeV scale…
Gauge Mediated Supersymmetry Breaking and String Theory
S. P. de Alwis, Z. Lalak
We discuss the possibility of finding scenarios, within type IIB string theory compactified on Calabi-Yau orientifolds with fluxes, for realizing gauge mediated supersymmetry break…
On Anomaly Mediated SUSY Breaking
S. P. de Alwis
A discrepancy between the Anomaly Mediated Supersymmetry Breaking (AMSB) gaugino mass calculated from the work of Kaplunovsky and Louis (hep-th/9402005) (KL) and other calculations…
On Gauge Mediated SUSY Breaking and Moduli Stabilization
S. P. de Alwis
A generic lesson of string theory is that the coupling constants of an effective low energy theory are determined by the vacuum values of a set of fields - the so-called moduli - s…
Warped Supersymmetry Breaking
C. P. Burgess, P. G. Camara, S. P. de Alwis +4
We address the size of supersymmetry-breaking effects within higher-dimensional settings where the observable sector resides deep within a strongly warped region, with supersymmetr…
String Phenomenology and the Cosmological Constant
S. P. de Alwis
It is argued that classical string solutions should not be fine tuned to have a positive cosmological constant (CC) at the observed size, since even the quantum corrections from st…
The Scales of Brane Nucleation Processes
S. P. de Alwis
The scales associated with Brown-Teitelboim-Bousso-Polchinski processes of brane nucleation, which result in changes of the flux parameters and the number of D-branes, are discusse…
Transitions Between Flux Vacua
S. P. de Alwis
A dynamical description of the transitions between different backgrounds requires the existence of a background independent action which propagates the correct number of degrees of…
Potentials for Light Moduli in Supergravity and String Theory
S. P. de Alwis
This is an account of lectures that were given at TASI 2005, the Shanghai Summer School in M-theory 2005 and the Perimeter Institute. I review 1) the derivation of the potential fo…
The Landscape of String Theory and The Wave Function of the Universe
R. Brustein, S. P. de Alwis
We explore the possibility that quantum cosmology considerations could provide a selection principle in the landscape of string vacua. We propose that the universe emerged from the…
Effective Potentials for Light Moduli
S. P. de Alwis
We examine recent work on compactifications of string theory with fluxes, where effective potentials for light moduli have been derived after integrating out moduli that are assume…
Brane Worlds in 5D and Warped Compactifications in IIB
S. P. de Alwis
In computing potentials for moduli in for instance type IIB string theory in the presence of fluxes and branes a factorisable ansatz for the ten dimensional metric is usually made.…
Cosmological stabilization of moduli with steep potentials
R. Brustein, S. P. de Alwis, P. Martens
A scenario which overcomes the well-known cosmological overshoot problem associated with stabilizing moduli with steep potentials in string theory is proposed. Our proposal relies…
On Potentials from Fluxes
S. P. de Alwis
We discuss the compactification of type IIB supergravity with fluxes to generate a potential for the moduli. In particular we resolve an apparent conflict with the no-go theorem fo…
M-Theory Moduli Space and Cosmology
R. Brustein, S. P. de Alwis, E. G. Novak
We conduct a systematic search for a viable string/M-theory cosmology, focusing on cosmologies that include an era of slow-roll inflation, after which the moduli are stabilized and…
Radiation of RR states from NS Fivebranes
S. P. de Alwis
We show that the recent observation that near extremal NS fivebranes decay due to Hawking radiation, can be understood in terms of their coupling to RR states which does not vanish…