Varying Constants and Fundamental Cosmology – VARCOSMOFUN’16

Session

[INF/DM] Inflation, early universe and dark matter

2-INF

15 Sept 2016, 14:00

Room 6

Conveners

[INF/DM] Inflation, early universe and dark matter

• Mark Hindmarsh (University of Sussex)

[INF/DM] Inflation, early universe and dark matter

• Enrico Maria Sessolo (NCBJ, Warsaw)

83. Higgs Starobinsky inflation

Iberê Kuntz

15/09/2016, 14:00

parallel

The idea that inflation may be due to degrees of freedom already present in the standard
model of particle physics or quantum general relativity is extremely attractive and has received much attention in the recent years. In particular two models stand out by their
simplicity and elegance. Higgs inflation with a large non-minimal coupling of the Higgs
boson $H$ to the Ricci scalar ($\xi...

32. Running of the Higgs quartic coupling, gravity and the stability of the Higgs effective potential

Lukasz Nakonieczny (University of Warsaw)

15/09/2016, 14:30

parallel

Motivated by the cosmological setup, we investigated the influence of the gravity induced terms on the Higgs field effective action. Using the heat kernel approach we obtained the one-loop effective action in the classical curved spacetime. Specializing to the standard cosmological metric, we studied the effect of gravitational field of this form on the behavior of the Higgs effective...

55. Running of the Running and Entropy Perturbations During Inflation

Chris Longden (University of Sheffield)

15/09/2016, 15:00

parallel

In single field slow-roll inflation, one expects that the spectral index $n_s-1$ is first order in slow-roll parameters. Similarly, its running ${\alpha }_s=\mathrm{d}{n}_s/\mathrm{d}\log k$ and the running of the running ${\beta }_s=\mathrm{d}{\alpha }_s/\mathrm{d}\log k$ are second and third order and therefore expected to be progressively smaller, and usually negative. Recent analyses hinting...

114. Complete Hamiltonian analysis of cosmological perturbations at all orders

Debottam Nandi

15/09/2016, 16:10

parallel

The work is based on two following papers:

1. D. Nandi and S. Shankaranarayanan, Complete Hamiltonian analysis of cosmological perturbations at all orders, JCAP 1606 (2016), no. 06 038, [arXiv:1512.02539].
2. D. Nandi and S. Shankaranarayanan, Complete Hamiltonian analysis of cosmological perturbations at all orders II: Non-canonical scalar field, submitted in JCAP, [arXiv:1606.05747].

82. Less-simplified models of dark matter for direct detection and the LHC

Dr Arghya Choudhury (University of Sheffield)

15/09/2016, 16:40

parallel

We construct models of dark matter with suppressed spin-independent scattering cross section utilizing the existing simplified model framework. Even simple combinations of simplified models can exhibit interference effects that cause the tree level contribution to the scattering cross section to vanish, thus demonstrating that direct detection limits on simplified models are not robust when...

38. Cosmological Isotropization from Symmetry Point of View

Sajid Ali

15/09/2016, 17:10

parallel

Bianchi models can be used to address the isotropization problem during the cosmological expansion of a homogeneous universe at an earlier epoch of its evolution. As there is a large family of such models, therefore it is necessary to characterize them on the basis of their geometrical and dynamical properties which we accomplish using Noether point symmetries of the geodetic Lagrangian in...