Bio


What physics lies beyond the Standard Model and how can we discover it?

Professor Graham is broadly interested in theoretical physics beyond the Standard Model which often involves cosmology, astrophysics, general relativity, and even atomic physics. The Standard Model leaves many questions unanswered including the nature of dark matter and the origins of the weak scale, the cosmological constant, and the fundamental fermion masses. These clues are a guide to building new theories beyond the Standard Model. He recently proposed a new solution to the hierarchy problem which uses dynamical relaxation in the early universe instead of new physics at the weak scale.

Professor Graham is also interested in inventing novel experiments to discover such new physics, frequently using techniques from astrophysics, condensed matter, and atomic physics. He is a proposer and co-PI of the Cosmic Axion Spin Precession Experiment (CASPEr) and the DM Radio experiment. CASPEr uses nuclear magnetic resonance techniques to search for axion dark matter. DM Radio uses high precision magnetometry and electromagnetic resonators to search for hidden photon and axion dark matter. He has also proposed techniques for gravitational wave detection using atom interferometry.

Current areas of focus:

Theory beyond the Standard Model
Dark matter models and detection
Novel experimental proposals for discovering new physics such as axions and gravitational waves
Understanding results from experiments ranging from the LHC to early universe cosmology


CAREER HISTORY:

After completing his undergraduate work at Harvard, Peter Graham received his PhD from Stanford in 2007. He was a postdoctoral research associate for one year with the particle theory group at SLAC and then took a postdoctoral position with the Stanford Institute for Theoretical Physics in the Physics Department. Graham began his appointment as Assistant Professor in the Department of Physics in September 2010.

Honors and Awards:

DOE Early Career Award 2014
Terman Fellowship, Stanford

Academic Appointments


Administrative Appointments


  • Terman Fellowship, Stanford University (2013 - 2013)
  • Assistant Professor of Physics, Stanford Institute for Theoretical Physics (2010 - Present)
  • Postdoctoral Scholar, Stanford Institute for Theoretical Physics (2008 - 2010)
  • Visiting Member, Institute for Advanced Study (2008 - 2008)
  • Research Associate, SLAC National Accelerator Laboratory (2007 - 2008)
  • Graduate Fellowship, Mellam Family Foundation (2006 - 2007)
  • Fellowship, Achievement Rewards for College Scientists (2005 - 2006)
  • National Defense Science and Engineering Graduate Fellowship, Department of Defense (2002 - 2005)

Honors & Awards


  • DOE Early Career Award, Department of Energy (2014)
  • Hellman Faculty Scholar, Hellman Fellows Fund (2013)
  • Phi Beta Kappa, Harvard University (2002)
  • Sanderson Award for top senior physics student, Harvard University (2002)

Boards, Advisory Committees, Professional Organizations


  • Member, Fermi Telescope Collaboration
  • Chair, Physics Department Graduate Qualifying Exam Committee, Stanford University (2012 - 2013)
  • Member, Physics Department Graduate Studies Committee, Stanford University (2012 - 2013)
  • First-Year Graduate Advisor, Stanford University (2012 - 2013)
  • Co-organizer, SavasFest conference (2012 - 2012)
  • Lecturer, EPGY summer institute (2011 - 2012)

Professional Education


  • Ph.D., Stanford University, Physics (2007)
  • A.M., Harvard University, Physics (2002)
  • A.B., Harvard University, Physics (2002)

Current Research and Scholarly Interests


What physics lies beyond the Standard Model and how can we discover it?

Professor Graham is broadly interested in theoretical physics beyond the Standard Model which often involves cosmology, astrophysics, general relativity, and even atomic physics. The Standard Model leaves many questions unanswered including the nature of dark matter and the origins of the weak scale, the cosmological constant, and the fundamental fermion masses. These clues are a guide to building new theories beyond the Standard Model. He recently proposed a new solution to the hierarchy problem which uses dynamical relaxation in the early universe instead of new physics at the weak scale.

Professor Graham is also interested in inventing novel experiments to discover such new physics, frequently using techniques from astrophysics, condensed matter, and atomic physics. He is a proposer and co-PI of the Cosmic Axion Spin Precession Experiment (CASPEr) and the DM Radio experiment. CASPEr uses nuclear magnetic resonance techniques to search for axion dark matter. DM Radio uses high precision magnetometry and electromagnetic resonators to search for hidden photon and axion dark matter. He has also proposed techniques for gravitational wave detection using atom interferometry.

Current areas of focus:

Theory beyond the Standard Model
Dark matter models and detection
Novel experimental proposals for discovering new physics such as axions and gravitational waves
Understanding results from experiments ranging from the LHC to early universe cosmology

All Publications


  • Vector dark matter from inflationary fluctuations PHYSICAL REVIEW D Graham, P. W., Mardon, J., Rajendran, S. 2016; 93 (10)
  • Dark matter direct detection with accelerometers PHYSICAL REVIEW D Graham, P. W., Kaplan, D. E., Mardon, J., Rajendran, S., Terrano, W. A. 2016; 93 (7)
  • Testing long-distance modifications of gravity to 100 astronomical units PHYSICAL REVIEW D Buscaino, B., DeBra, D., Graham, P. W., Gratta, G., Wiser, T. D. 2015; 92 (10)
  • Cosmological Relaxation of the Electroweak Scale PHYSICAL REVIEW LETTERS Graham, P. W., Kaplan, D. E., Rajendran, S. 2015; 115 (22)
  • Radio for hidden-photon dark matter detection PHYSICAL REVIEW D Chaudhuri, S., Graham, P. W., Irwin, K., Mardon, J., Rajendran, S., Zhao, Y. 2015; 92 (7)
  • Dark matter triggers of supernovae PHYSICAL REVIEW D Graham, P. W., Rajendran, S., Varela, J. 2015; 92 (6)
  • Towards a Bullet-proof test for indirect signals of dark matter PHYSICAL REVIEW D Graham, P. W., Rajendran, S., Van Tilburg, K., Wiser, T. D. 2015; 91 (10)
  • Experimental Searches for the Axion and Axion-Like Particles ANNUAL REVIEW OF NUCLEAR AND PARTICLE SCIENCE, VOL 65 Graham, P. W., Irastorza, I. G., Lamoreaux, S. K., Lindner, A., van Bibber, K. A. 2015; 65: 485-514
  • Parametrically enhanced hidden photon search PHYSICAL REVIEW D Graham, P. W., Mardon, J., Rajendran, S., Zhao, Y. 2014; 90 (7)
  • Supersymmetric crevices: Missing signatures of R-parity violation at the LHC PHYSICAL REVIEW D Graham, P. W., Rajendran, S., Saraswat, P. 2014; 90 (7)
  • Exploring eternal stability with the simple harmonic universe JOURNAL OF HIGH ENERGY PHYSICS Graham, P. W., Horn, B., Rajendran, S., Torroba, G. 2014
  • Proposal for a Cosmic Axion Spin Precession Experiment (CASPEr) PHYSICAL REVIEW X Budker, D., Graham, P. W., Ledbetter, M., Rajendran, S., Sushkov, A. O. 2014; 4 (2)
  • Displaced vertices from R-parity violation and baryogenesis PHYSICAL REVIEW D Barry, K., Graham, P. W., Rajendran, S. 2014; 89 (5)
  • A simple harmonic universe JOURNAL OF HIGH ENERGY PHYSICS Graham, P. W., Horn, B., Kachru, S., Rajendran, S., Torroba, G. 2014
  • New observables for direct detection of axion dark matter PHYSICAL REVIEW D Graham, P. W., Rajendran, S. 2013; 88 (3)
  • New method for gravitational wave detection with atomic sensors. Physical review letters Graham, P. W., Hogan, J. M., Kasevich, M. A., Rajendran, S. 2013; 110 (17): 171102-?

    Abstract

    Laser frequency noise is a dominant noise background for the detection of gravitational waves using long-baseline optical interferometry. Amelioration of this noise requires near simultaneous strain measurements on more than one interferometer baseline, necessitating, for example, more than two satellites for a space-based detector or two interferometer arms for a ground-based detector. We describe a new detection strategy based on recent advances in optical atomic clocks and atom interferometry which can operate at long baselines and which is immune to laser frequency noise. Laser frequency noise is suppressed because the signal arises strictly from the light propagation time between two ensembles of atoms. This new class of sensor allows sensitive gravitational wave detection with only a single baseline. This approach also has practical applications in, for example, the development of ultrasensitive gravimeters and gravity gradiometers.

    View details for PubMedID 23679702

  • New Method for Gravitational Wave Detection with Atomic Sensors PHYSICAL REVIEW LETTERS Graham, P. W., Hogan, J. M., Kasevich, M. A., Rajendran, S. 2013; 110 (17)
  • Semiconductor probes of light dark matter PHYSICS OF THE DARK UNIVERSE Graham, P. W., Kaplan, D. E., Rajendran, S., Walters, M. T. 2012; 1 (1-2): 32-49
  • New measurements with stopped particles at the LHC PHYSICAL REVIEW D Graham, P. W., Howe, K., Rajendran, S., Stolarski, D. 2012; 86 (3)
  • Displaced Supersymmetry JOURNAL OF HIGH ENERGY PHYSICS Graham, P. W., Kaplan, D. E., Rajendran, S., Saraswat, P. 2012
  • Limits on large extra dimensions based on observations of neutron stars with the Fermi-LAT JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS Ajello, M., Baldini, L., Barbiellini, G., Bastieri, D., Bechtol, K., Bellazzini, R., Berenji, B., Bloom, E. D., Bonamente, E., Borgland, A. W., Bregeon, J., Brigida, M., Bruel, P., Buehler, R., Buson, S., Caliandro, G. A., Cameron, R. A., Caraveo, P. A., Casandjian, J. M., Cecchi, C., Charles, E., Chekhtman, A., Chiang, J., Ciprini, S., Claus, R., Cohen-Tanugi, J., Conrad, J., Cutini, S., De Angelis, A., De Palma, F., Dermer, C. D., do Couto e Silva, E., Drell, P. S., Drlica-Wagner, A., Enoto, T., Favuzzi, C., Fegan, S. J., Ferrara, E. C., Fukazawa, Y., Fusco, P., Gargano, F., Gasparrini, D., Germani, S., Giglietto, N., Giordano, F., Giroletti, M., Glanzman, T., Godfrey, G., Graham, P., Grenier, I. A., Guiriec, S., Gustafsson, M., Hadasch, D., Hayashida, M., Hughes, R. E., Johnson, A. S., Kamae, T., Katagiri, H., Kataoka, J., Knoedlseder, J., Kuss, M., Lande, J., Latronico, L., Lionetto, A. M., Longo, F., Loparco, F., Lovellette, M. N., Lubrano, P., Mazziotta, M. N., Michelson, P. F., Mitthumsiri, W., Mizuno, T., Monte, C., Monzani, M. E., Morselli, A., Moskalenko, I. V., Murgia, S., Norris, J. P., Nuss, E., Ohsugi, T., Okumura, A., Orlando, E., Ormes, J. F., Ozaki, M., Paneque, D., Pesce-Rollins, M., Pierbattista, M., Piron, F., Pivato, G., Raino, S., Razzano, M., Ritz, S., Roth, M., Parkinson, P. M., Scargle, J. D., SCHALK, T. L., Sgro, C., SISKIND, E. J., Spandre, G., Spinelli, P., Suson, D. J., Tajima, H., Takahashi, H., Tanaka, T., Thayer, J. G., Thayer, J. B., Tibaldo, L., Tinivella, M., Torres, D. F., Troja, E., Uchiyama, Y., Usher, T. L., Vandenbroucke, J., Vasileiou, V., Vianello, G., Vitale, V., Waite, A. P., Winer, B. L., Wood, K. S., Wood, M., Yang, Z., Zimmer, S. 2012
  • Fundamental Physics at the Intensity Frontier Hewett, J. L., et al 2012
  • Semiconductor Probes of Light Dark Matter Physics of the Dark Universe Graham, P. W., Kaplan, D. E., Rajendran, S., Walters, M. T. 2012; 1 (32)
  • Axion dark matter detection with cold molecules PHYSICAL REVIEW D Graham, P. W., Rajendran, S. 2011; 84 (5)
  • Reply to "Comment on 'Atomic gravitational wave interferometric sensor'" PHYSICAL REVIEW D Dimopoulos, S., Graham, P. W., Hogan, J. M., Kasevich, M. A., Rajendran, S. 2011; 84 (2)
  • An atomic gravitational wave interferometric sensor in low earth orbit (AGIS-LEO) GENERAL RELATIVITY AND GRAVITATION Hogan, J. M., Johnson, D. M., Dickerson, S., Kovachy, T., Sugarbaker, A., Chiow, S., Graham, P. W., Kasevich, M. A., Saif, B., Rajendran, S., Bouyer, P., Seery, B. D., Feinberg, L., Keski-Kuha, R. 2011; 43 (7): 1953-2009
  • Dark Matter Searches with Astroparticle Data ANNUAL REVIEW OF ASTRONOMY AND ASTROPHYSICS, VOL 49 Porter, T. A., Johnson, R. P., Graham, P. W. 2011; 49: 155-194
  • Luminous dark matter PHYSICAL REVIEW D Feldstein, B., Graham, P. W., Rajendran, S. 2010; 82 (7)
  • Observing the dimensionality of our parent vacuum PHYSICAL REVIEW D Graham, P. W., Harnik, R., Rajendran, S. 2010; 82 (6)
  • Exothermic dark matter PHYSICAL REVIEW D Graham, P. W., Harnik, R., Rajendran, S., Saraswat, P. 2010; 82 (6)
  • Little solution to the little hierarchy problem: A vectorlike generation PHYSICAL REVIEW D Graham, P. W., Ismail, A., Rajendran, S., Saraswat, P. 2010; 81 (5)
  • Domino theory of flavor PHYSICAL REVIEW D Graham, P. W., Rajendran, S. 2010; 81 (3)
  • Decaying dark matter as a probe of unification and TeV spectroscopy PHYSICAL REVIEW D Arvanitaki, A., Dimopoulos, S., Dubovsky, S., Graham, P. W., Harnik, R., Rajendran, S. 2009; 80 (5)
  • Gravitational wave detection with atom interferometry PHYSICS LETTERS B Dimopoulos, S., Graham, P. W., Hogan, J. M., Kasevich, M. A., Rajendran, S. 2009; 678 (1): 37-40
  • Astrophysical probes of unification PHYSICAL REVIEW D Arvanitaki, A., Dimopoulos, S., Dubovsky, S., Graham, P. W., Harnik, R., Rajendran, S. 2009; 79 (10)
  • Atomic gravitational wave interferometric sensor PHYSICAL REVIEW D Dimopoulos, S., Graham, P. W., Hogan, J. M., Kasevich, M. A., Rajendran, S. 2008; 78 (12)
  • General relativistic effects in atom interferometry PHYSICAL REVIEW D Dimopoulos, S., Graham, P. W., Hogan, J. M., Kasevich, M. A. 2008; 78 (4)
  • Testing general relativity with atom interferometry PHYSICAL REVIEW LETTERS Dimopoulos, S., Graham, P. W., Hogan, J. M., Kasevich, M. A. 2007; 98 (11)

    Abstract

    The unprecedented precision of atom interferometry will soon lead to laboratory tests of general relativity to levels that will rival or exceed those reached by astrophysical observations. We propose such an experiment that will initially test the equivalence principle to 1 part in 10(15) (300 times better than the current limit), and 1 part in 10(17) in the future. It will also probe general relativistic effects - such as the nonlinear three-graviton coupling, the gravity of an atom's kinetic energy, and the falling of light - to several decimals. In contrast with astrophysical observations, laboratory tests can isolate these effects via their different functional dependence on experimental variables.

    View details for DOI 10.1103/PhysRevLett.98.111102

    View details for Web of Science ID 000244959300014

    View details for PubMedID 17501039

  • Four Taus at the Tevatron Graham, P. W., Pierce, A., Wacker, J. G. 2006
  • Limits on split supersymmetry from gluino cosmology PHYSICAL REVIEW D Arvanitaki, A., Davis, C., Graham, P. W., Pierce, A., Wacker, J. G. 2005; 72 (7)
  • Indirect signals from dark matter in split supersymmetry PHYSICAL REVIEW D Arvanitaki, A., Graham, P. W. 2005; 72 (5)
  • One loop predictions of the finely tuned supersymmetric standard model PHYSICAL REVIEW D Arvanitaki, A., Davis, C., Graham, P. W., Wacker, J. G. 2004; 70 (11)
  • The scintillation efficiency of carbon and hydrogen recoils in an organic liquid scintillator for dark matter searches ASTROPARTICLE PHYSICS Hong, J., Craig, W. W., Graham, P., Hailey, C. J., Spooner, N. J., Tovey, D. R. 2002; 16 (3): 333-338