Hael Collins
Department of Physics
Carnegie Mellon University
Pittsburgh, PA 15213, United States

Overview

Research

Articles

Seminars

Courses

Lectures

Articles, reviews, and proceedings

My research has largely been in the fields of theoretical particle physics and cosmology.   This page groups my articles together according to particular topics with links to public copies.   Most of these articles are also available through INSPIRE, a database of high energy physics information.   For example, a listing of my articles is available there and INSPIRE has an author page for me.

Stochastic inflation

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H. Collins, R. Holman, and T. Vardanyan, “The quantum Fokker-Planck equation of stochastic inflation,” JHEP 1711 (2017) 065; arXiv:1706.07805.

Mixed states and general intial states in field theory and inflation

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H. Collins and T. Vardanyan, “Entangled Scalar and Tensor Fluctuations during Inflation,” JCAP 1611 (2016) 059; arXiv:1601.05415.

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H. Collins, R. Holman, and T. Vardanyan, “Renormalizing an initial state,” JHEP 1410 (2014) 124; arXiv:1408.4801.

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H. Collins, R. Holman, and T. Vardanyan, “Do Mixed States save Effective Field Theory from BICEP?,” arXiv:1403.4592.

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H. Collins, “Initial state propagators,” JHEP 1311 (2013) 77; arXiv:1309.2656.

Consistency relations in inflation

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H. Collins, R.Holman, and T. Vardanyan, “A Cosmological Slavnov-Taylor Identity,” JCAP 1412 (2014) 007; arXiv:1405.0017.

Time-dependent effective field theory

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H. Collins, R. Holman, and A. Ross, “Effective field theory in time-dependent settings,” JHEP 1302 (2013) 108; arXiv:1208.3255.

Non-Gaussianities from inflation

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H. Collins, Primordial non-Gaussianities from inflation, lecture notes presented at the Niels Bohr Institute, astro-ph.CO/1101.1308.

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H. Collins, “Enhancing non-Gaussianities by breaking local Lorentz invariance,” in the Proceedings of The Invisible Universe International Conference, Paris, June 29–July 3, 2009, arXiv:0911.2786.

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H. Collins and R. Holman, “Trans-Planckian enhancements of the primordial non-Gaussianities,” Phys. Rev. D 80, 043524 (2009) hep-ph/0905.4925.

Inhomogeneities

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H. Collins, “The influence of inhomogeneities on the large-scale expansion of the universe,” arXiv:1011.2046.

Unparticles

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H. Collins and R. Holman, “Unparticles and inflation,” Phys. Rev. D 78, 025023 (2008) hep-ph/0802.4416.

The trans-Planckian problem of inflation

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H. Collins, “Trans-Planckian relics in the scalar to tensor ratio,” hep-ph/0810.5742.

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H. Collins and R. Holman, “Trans-Planckian signals from the breaking of local Lorentz invariance,” Phys. Rev. D 77, 105016 (2008) hep-ph/0705.4666.

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H. Collins and R. Holman, “The energy-momentum tensor for an effective initial state and the renormalization of gravity,” hep-th/0609002.

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H. Collins and R. Holman, “Looking for transPlanckia in the CMB,” in the Proceedings of the Rencontres de Moriond: Contents and Structures of the Universe, La Thuile, Italy, March 18–25, 2006.

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H. Collins and R. Holman, “The renormalization of the energy-momentum tensor for an effective initial state,” Phys. Rev. D 74 045009 (2006) hep-th/0605107.

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H. Collins and R. Holman, “An effective theory of initial conditions in inflation,” hep-th/0507081.

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H. Collins and R. Holman, “Renormalization of initial conditions and the trans-Planckian problem of inflation” Phys. Rev. D 71, 085009 (2005), hep-th/0501158.

Quantum field theory in de Sitter space

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H. Collins, “Fermionic α-vacua,” Phys. Rev. D 71, 024002 (2005), hep-th/0410229.

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H. Collins, “The taming of the α-vacuum,” prepared for the PASCOS 2004 Conference, 2004, hep-th/0410228.

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H. Collins, “A short introduction to the fate of the α-vacuum,”  prepared for the 3rd International Symposium on Quantum Theory and Symmetries, 2003, hep-th/0312144.

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H. Collins and R. Holman, “Taming the α-vacuum,” Phys. Rev. D 70, 084019 (2004) D, hep-th/0312143.

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H. Collins and M. R. Martin, “The enhancement of inflaton loops in an α-vacuum,” Phys. Rev. D 70, 084021 (2003) hep-ph/0309263.

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H. Collins, R. Holman and M. R. Martin, “The fate of the α-vacuum,” Phys. Rev. D 68, 124012 (2003) hep-th/0306028.

Randall-Sundrum scenarios

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H. Collins and R. Holman, “The invisible axion in a Randall-Sundrum universe,” Phys. Rev. D 67, 105004 (2003) hep-ph/0210110.

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H. Collins, R. Holman and M. R. Martin, “Brane preheating through radion dynamics,” Phys. Rev. Lett.  90, 231301 (2003) hep-ph/0205240.

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H. Collins, R. Holman and M. R. Martin, “Randall-Sundrum I cosmology as brane dynamics in an AdS-Schwarzschild bulk,” Phys. Rev. D 65, 125018 (2002) hep-ph/0203077.

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H. Collins and B. Holdom, “Linearized gravity about a brane,” Phys. Rev. D 62, 124008 (2000) hep-th/0006158.

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H. Collins, “Brane cosmologies without orbifolds,” AIP Conf. Proc. 541, 1 (2000).

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H. Collins and B. Holdom, “Brane cosmologies without orbifolds,” Phys. Rev. D 62, 105009 (2000) hep-ph/0003173.

Warped and periodic metrics

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H. Collins and B. Holdom, “Matter in a warped and oscillating background,” Phys. Rev. D 65, 124014 (2002) hep-ph/0110322.

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H. Collins and B. Holdom,, “The decay of the cosmological constant through an oscillating metric,” JHEP 0210, 052 (2002) hep-th/0107042.

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H. Collins, “Hiding a cosmological constant in a warped extra dimension,” prepared for 23rd Annual MRST Conference on High-Energy Physics (MRST 2001), London, Ontario, Canada, May 16–18, 2001.

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H. Collins, “The Randall-Sundrum scenario with an extra warped dimension,” prepared for the PASCOS 2001 Conference, University of North Carolina, Chapel Hill, April 9–14, 2001.

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H. Collins and B. Holdom, “The Randall-Sundrum scenario with an extra warped dimension,” Phys. Rev. D 64, 064003 (2001) hep-ph/0103103.

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H. Collins and B. Holdom, “The cosmological constant and warped extra dimensions,” Phys. Rev. D 63, 084020 (2001) hep-th/0009127.

Electroweak symmetry breaking and particle phenomenology

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H. Collins, A. K. Grant and H. Georgi, “The phenomenology of a top quark seesaw model,” Phys. Rev. D 61, 055002 (2000) hep-ph/9908330.

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H. Collins, A. K. Grant and H. Georgi, “Dynamically broken topcolor at large N,” hep-ph/9907477.

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H. Collins and H. Georgi, “ S3 and the L = 1 baryons in the quark model and the chiral quark model,” Phys. Rev. D 59, 094010 (1999) hep-ph/9810392.

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H. Collins and H. Georgi, “A little large N group theory,” Phys. Lett. B 394, 152 (1997) hep-ph/9611402.

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H. Collins, H. Georgi and D. Zeltser, “A Perturbative Expansion for Weakly Bound States,” hep-ph/9510398.