462 citations · 3.9k across the 76 of their papers we have counts for
18 papers · 1 filter
Non-thermal Production of Dark Matter from Primordial Black Holes
Rouzbeh Allahverdi, James B. Dent, Jacek Osinski
We present a scenario for non-thermal production of dark matter from evaporation of primordial black holes. A period of very early matter domination leads to formation of black hol…
Killing the Straw Man: Does BICEP Prove Inflation at the GUT Scale?
James B. Dent, Lawrence M. Krauss, Harsh Mathur
The surprisingly large value of , the ratio of power in tensor to scalar density perturbations in the CMB reported by the BICEP2 Collaboration, if confirmed, provides strong evi…
Cosmology with non-minimal derivative couplings: perturbation analysis and observational constraints
James B. Dent, Sourish Dutta, Emmanuel N. Saridakis +1
We perform a combined perturbation and observational investigation of the scenario of non-minimal derivative coupling between a scalar field and curvature. First we extract the nec…
Damping of Primordial Gravitational Waves from Generalized Sources
James B. Dent, Lawrence M. Krauss, Subir Sabharwal +1
It has been shown that a cosmological background with an anisotropic stress tensor, appropriate for a free streaming thermal neutrino background, can damp primordial gravitational…
The Scientific Reach of Multi-Ton Scale Dark Matter Direct Detection Experiments
Jayden L. Newstead, Thomas D. Jacques, Lawrence M. Krauss +2
The next generation of large scale WIMP direct detection experiments have the potential to go beyond the discovery phase and reveal detailed information about both the particle phy…
CDM and Baryons as Distinct Fluids in a Linear Approximation for the Growth of Structure
Soma De, James B. Dent, Lawrence M. Krauss
A single fluid approximation which treats perturbations in baryons and dark matter as equal has sometimes been used to calculate the growth of linear matter density perturbations i…
Testing General Relativity Using the Evolution of Linear Bias
S. Basilakos, J. B. Dent, S. Dutta +2
We investigate the cosmic evolution of the linear bias in the framework of a flat FLRW spacetime. We consider metric perturbations in the Newtonian gauge, including Hubble scale ef…
Cosmological constraints from CMB distortion
James B. Dent, Damien A. Easson, Hiroyuki Tashiro
We examine bounds on adiabatic and isocurvature density fluctuations from -type spectral distortions of the cosmic microwave background (CMB). Studies of such distortion are com…
Constraints on Light Hidden Sector Gauge Bosons from Supernova Cooling
James B. Dent, Francesc Ferrer, Lawrence M. Krauss
We derive new bounds on hidden sector gauge bosons which could produce new energy loss mechanisms in supernovae, enlarging the excluded region in mass-coupling space by a significa…
Matter Bounce Cosmology with the f(T) Gravity
Yi-Fu Cai, Shih-Hung Chen, James B. Dent +2
We show that the f(T) gravitational paradigm, in which gravity is described by an arbitrary function of the torsion scalar, can provide a mechanism for realizing bouncing cosmologi…
A new approach to the vacuum of inflationary models
Shih-Hung Chen, James B. Dent
A new approach is given for the implementation of boundary conditions used in solving the Mukhanov-Sasaki equation in the context of inflation. The familiar quantization procedure…
f(T) gravity mimicking dynamical dark energy. Background and perturbation analysis
James B. Dent, Sourish Dutta, Emmanuel N. Saridakis
We investigate f(T) cosmology in both the background, as well as in the perturbation level, and we present the general formalism for reconstructing the equivalent one-parameter fam…
Cosmological perturbations in f(T) gravity
Shih-Hung Chen, James B. Dent, Sourish Dutta +1
We investigate the cosmological perturbations in f(T) gravity. Examining the pure gravitational perturbations in the scalar sector using a diagonal vierbien, we extract the corresp…
Parametrization for the Scale Dependent Growth in Modified Gravity
Juan C. Bueno Sanchez, James B. Dent, Sourish Dutta +1
We propose a scale dependent analytic approximation to the exact linear growth of density perturbations in Scalar-Tensor (ST) cosmologies. In particular, we show that on large subh…
Probing the Gravitational Wave Signature from Cosmic Phase Transitions at Different Scales
Lawrence M. Krauss, Katherine Jones-Smith, Harsh Mathur +1
We present a new signature by which to one could potentially discriminate between a spectrum of gravitational radiation generated by a self-ordering scalar field vs that of inflati…
Thermal Relic Abundances of Particles with Velocity-Dependent Interactions
James B. Dent, Sourish Dutta, Robert J. Scherrer
We reexamine the evolution of thermal relic particle abundances for the case where the interaction rate depends on the particle velocities. For the case of Sommerfeld enhancement,…
Towards Realizing Warm Inflation in String Theory
Mar Bastero-Gil, Arjun Berera, James B. Dent +1
We give a generic argument that string theory provides a natural setting for warm inflationary cosmology. We then explore a specific model with an inflaton modulus field coupled to…
New Parametrization for the Scale Dependent Growth Function in General Relativity
James B. Dent, Sourish Dutta, Leandros Perivolaropoulos
We demonstrate the scale dependence of the growth function of cosmological perturbations in dark energy models based on General Relativity. This scale dependence is more prominent…