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A universe without weak interactions is constructed that undergoes big-bang nucleosynthesis, matter domination, structure formation, and star formation. The stars in this universe are able to burn for billions of years, synthesize elements up to iron, and undergo supernova explosions, dispersing heavy elements into the interstellar medium. These definitive… (More)

We compute the expected value of the cosmological constant in our universe from the Causal Entropic Principle. Since observers must obey the laws of ther-modynamics and causality, it asserts that physical parameters are most likely to be found in the range of values for which the total entropy production within a causally connected region is maximized.… (More)

- Leandro G. Almeida, Seung J. Lee, Gilad Perez, Ilmo Sung, Joseph Virzi
- 2008

We investigate the reconstruction of high p T hadronically-decaying top quarks at the Large Hadron Collider. One of the main challenges in identifying energetic top quarks is that the decay products become increasingly collimated. This reduces the efficacy of conventional reconstruction methods that exploit the topology of the top quark decay chain. We… (More)

- Rakhi Mahbubani, Michele Papucci, Gilad Perez, Joshua T Ruderman, Andreas Weiler
- Physical review letters
- 2013

Experimental bounds on squarks of the first two generations assume their masses to be eightfold degenerate and consequently constrain them to be heavier than ∼1.4 TeV when the gluino is lighter than 2.5 TeV. The assumption of squark-mass universality is neither a direct consequence of minimal flavor violation (MFV), which allows for splittings within… (More)

The Randall-Sundrum (RS) framework has a built in protection against flavour violation, but still generically suffers from little CP problems. The most stringent bound on flavour violation is due to K , which is inversely proportional to the fundamental Yukawa scale. Hence the RS K problem can be ameliorated by effectively increasing the Yukawa scale with a… (More)

- Kaustubh Agashe, Gilad Perez, Amarjit Soni
- Physical review letters
- 2004

We study predictions for B physics in a class of warped extra dimension models recently introduced, where few ( approximately 3) TeV Kaluza-Klein masses are consistent with electroweak data due to custodial symmetry. As in the standard model (SM), flavor violations arise due to the heavy top quark leading to striking signals: (i) New physics contributions… (More)

- Gilad Perez, Kaustubh Agashe, +5 authors Zoltan Ligeti
- 2006

- Zoltan Ligeti, Michele Papucci, Gilad Perez
- Physical review letters
- 2006

We analyze the significant new model independent constraints on extensions of the standard model (SM) that follow from the recent measurements of the Bs(0)Bs(0) mass difference. The time-dependent CP asymmetry in Bs-->psiphi, S(psiphi), will be measured with good precision in the first year of CERN Large Hadron Collider (LHC) data taking, which will further… (More)

We construct a simple theory in which the fine-tuning of the standard model is significantly reduced. Radiative corrections to the quadratic part of the scalar potential are constrained to be symmetric under a global U (4) × U (4) ′ symmetry due to a discrete Z 2 " twin " parity, while the quartic part does not possess this symmetry. As a consequence, when… (More)

- G Perez, J L Radomski
- Industrial medicine & surgery
- 1965