Ghazal Geshnizjani

Ghazal Geshnizjani's picture
University of Waterloo - Department of Applied Mathematics

Area of Research:
Phone: (519) 569-7600 x6531

AFFILIATIONS

Faculty at Department of Applied Mathematics, University of Waterloo \\ PSI fellow at Perimeter Institute

Research Interests

My area of research is theoretical cosmology and more specifically early universe cosmology.

In the past, I have studied the back-reaction of cosmological fluctuations due to nonlinearities in Einstein equations and I have also worked on brane inflation, bouncing universes, Dark Energy and Modified Gravity models.

In my future research, I would like to further explore the connection between fundamental physics and cosmology.

I am also interested in working out new observational signatures of current models of early universe cosmology.

Awards

  • Dissertation Fellowship Award, Award, Brown University

Recent Publications

  • Niayesh Afshordi, Ghazal Geshnizjani, Justin Khoury (Perimeter Institute), Observational Evidence for Cosmological-Scale Extra Dimensions, JCAP 08 (2009) 030, arXiv: 0812.2244
  • Rachel Bean, Daniel J.H. Chung, Ghazal Geshnizjani, Reconstructing a general inflationary action, Phys.Rev.D78:023517,2008, arXiv: 0801.0742
  • Niayesh Afshordi (ITC, Harvard), Daniel J.H. Chung (UW-Madison), Michael Doran (Heidelberg), Ghazal Geshnizjani (UW-Madison), Cuscuton Cosmology: Dark Energy meets Modified Gravity, Phys.Rev.D75:123509,2007, arXiv: astro-ph/0702002
  • Niayesh Afshordi (ITC, Harvard), Daniel J.H. Chung, Ghazal Geshnizjani (UW-Madison), Cuscuton: A Causal Field Theory with an Infinite Speed of Sound, Phys.Rev.D75:083513,2007, arXiv: hep-th/0609150
  • Ghazal Geshnizjani, Thorsten J. Battefeld, A Note on Perturbations During a Regular Bounce, Phys.Rev. D73 (2006) 048501, arXiv: hep-th/0506139
  • Ghazal Geshnizjani, Daniel J.H. Chung (UW-Madison), Niayesh Afshordi (Harvard), Do Large-Scale Inhomogeneities Explain Away Dark Energy?, Phys.Rev. D72 (2005) 023517, arXiv: astro-ph/0503553
  • T. J. Battefeld, G. Geshnizjani, Perturbations in a regular bouncing Universe, Phys.Rev. D73 (2006) 064013, arXiv: hep-th/0503160
  • Ghazal Geshnizjani, Niayesh Afshordi, Coarse-Grained Back Reaction in Single Scalar Field Driven Inflation, JCAP 0501 (2005) 011, arXiv: gr-qc/0405117
  • Ghazal Geshnizjani, Robert Brandenberger, Back Reaction Of Perturbations In Two Scalar Field Inflationary Models, JCAP 0504 (2005) 006, arXiv: hep-th/0310265
  • R. Brandenberger, G. Geshnizjani, S. Watson (Brown Univ.), On the Initial Conditions for Brane Inflation, Phys.Rev. D67 (2003) 123510, arXiv: hep-th/0302222
  • Ghazal Geshnizjani, Robert Brandenberger, Back Reaction And Local Cosmological Expansion Rate, Phys.Rev.D66:123507,2002, arXiv: gr-qc/0204074
  • The effect of extra dimensions on gravity wave bursts from cosmic string cusps, Eimear O'Callaghan, Sarah Chadburn, Ghazal Geshnizjani, Ruth Gregory, Ivonne Zavala, arXiv: 1005.3220
  • On detection of extra dimensions with gravity waves from cosmic strings, Eimear O'Callaghan, Sarah Chadburn, Ghazal Geshnizjani, Ruth Gregory, Ivonne Zavala, arXiv: 1003.4395

Seminars

  • Observational Evidence for Cosmological-Scale Extra Dimensions}, Theory Canada 5, University of New Brunswick, Fredericon, NB, Canada
  • Observational Evidence for Cosmological-Scale Extra Dimensions},Program on Connecting Fundamental Physics with Observations, Kavli Institute for Theoretical Physics China at the Chinese Academy of Sciences (KITPC), Beijing, China
  • Observational Evidence for Cosmological-Scale Extra Dimensions,Joint Seminars on Cosmology and Gravitation, The Institute for the Physics and Mathematics of the Universe (IPMU), Kashiwa city, Japan
  • Explaining Anomalies in Cosmology with Modified Gravity, High Energy Theory Seminar, University of Michigan, Ann Arbor, MI
  • Constraining the Inflationary Action with Cosmological Observations, Cosmology Seminar, Institut D'Astrophysique De Paris, Paris, France
  • Cosmic Inflation through Time, Colloquium, Physics Department, University of Syracuse, Syracuse, NY
  • Constraining the Inflationary Action with Cosmological Observations, High Energy Theory/ Relativity/ Cosmology Seminars, Physics Department, University of Syracuse, Syracuse, NY
  • Cosmic Inflation through Time, Colloquium, Physics Department, York University, Toronto, Ontario, Canada
  • Cosmic Inflation through Time, Colloquium, Physics Department, University of Utah, Salt Lake City, UT
  • Investigating Reconstructing of a General, Slow-roll, Inflationary Action from CMB Observations, Cosmic Microwave Radiation Conference, Center for Physcis, Aspen, CO
  • Cuscuton Cosmology: Dark Energy meets Modified Gravity}, High Energy Physics seminar, Physics Department, McGill University, Montreal, Canada
  • PIRSA:09050084, Observational Evidence for Cosmological-Scale Extra Dimensions, 2009-05-26, New Prospects for Solving the Cosmological Constant Problem
  • PIRSA:08060133, Constraining the inflationary action with cosmological observations, 2008-06-03, PASCOS 08
  • Cuscuton Cosmology: Dark Energy meets Modi ed Gravity,2006-11-10, Cosmology on the Great Lakes Meeting