Institute of Cosmology and Gravitation

  • Home
  • News
    • Positions available
  • ICG Members
    • ICG Academic Staff
    • ICG Professional and Support Staff
    • ICG Research Staff
    • ICG Students
    • ICG Visitors
  • For The Public
    • New to Cosmology?
    • Upcoming Events
    • Schools Outreach
    • Outreach Resources
      • Cosmic Stroll
    • Research Experience
    • Athena SWAN @ ICG
    • Dignity & Respect
  • Research Overview
    • The Very Early Universe
    • Dark Energy
    • Cosmological Tests of Gravity
    • Large Scale Structure
    • Gravitational Lensing
    • Supernovae
    • Galaxy Evolution
    • Stellar Population Modelling
    • Gravitational Waves
  • Talks, Lectures, Meetings
    • Colloquia
    • Tuesday Lunch
    • Theoretical Cosmology
    • Lectures
    • Galaxy Journal Club
    • LSS Meetings
    • Lensing Meetings
    • Gravity Meetings
    • UoP Workshops
    • GRADnet
  • Study With Us
    • Physics@Portsmouth
    • SEPnet
    • DISCnet
  • Contact Us

Shubham Maheshwari (University of Groningen, the Netherlands, Perturbations in higher derivative gravity beyond maximally symmetric spacetimes)

July 30, 2019 By Obinna Umeh


Event Details

  • Date: August 21, 2019 1:00 pm – 2:00 pm
  • Venue: DS 2.08
  • Categories: Theoretical Cosmology

|

Title: Perturbations in higher derivative gravity beyond maximally symmetric spacetimes

|

|

|

Abstract:

|

Higher derivative gravity is typically plagued by ghost-like states which spoil unitarity. In this talk, I will discuss a specific class of higher derivative gravity called Infinite Derivative Gravity (IDG), which is quadratic in curvature and characterized by form factors of infinite series of covariant derivatives. I will study (covariant) scalar-vector-tensor (SVT) perturbations at the quadratic level of its action, around conformally-flat non-maximally symmetric backgrounds. I will show how, generally, the SVT modes are coupled to each other at the level of the action and decouple in the known dS/AdS limits. Through simple examples of the full action, we will see how the form factors may be chosen to avoid the presence of any extra/ghost-like states in the spectrum.


Event Details

  • Date: August 21, 2019 1:00 pm – 2:00 pm
  • Venue: DS 2.08
  • Categories: Theoretical Cosmology

promo-button-public1promo-button-partners11promo-button-members1

Latest News

  • Public Event – Exploring the Universe of Black Holes with Gravitational Waves
  • Holes in the Universe sharpen cosmic measurements
  • Workshop on gravitational-wave Bayesian parameter estimation with PyCBC Inference
  • The Hunt for Enormous Early Stars
  • Special issue “Modified Gravity” in International Journal of Modern Physics D

Quick Links

  • How to get to the ICG
  • Upcoming Events
  • Additional Links

Twitter

Tweets by @UoPCosmology

Facebook

Design by FingerprintDigitalMedia.com
Copyright © 2019 ICG, Portsmouth

Institute of Cosmology and Gravitation Cookies Policy

Our Website uses cookies to improve your experience. Please visit our Cookies and privacy page for more information about cookies and how we use them.

Close