Ghazal Geshnizjani

Ghazal Geshnizjani's picture
University of Waterloo - Department of Physics and Astronomy

Area of Research:
Phone: x6531

I am currently a postdoctoral fellow at SUNY Buffalo and frequent visitor at Perimeter Institute for Theoretical Physics. 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 and I have also worked on brane inflation, bouncing universes and dark energy models.

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.

Positions Held

  • 2004-2007 Department of Physics, University of Wisconsin-Madison, Research associate

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
  • 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, 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