scholarly journals Ultralight bosons for strong gravity applications from simple Standard Model extensions

2021 ◽  
Vol 2021 (12) ◽  
pp. 047
Author(s):  
Felipe F. Freitas ◽  
Carlos A.R. Herdeiro ◽  
António P. Morais ◽  
António Onofre ◽  
Roman Pasechnik ◽  
...  
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Mass Spectrum ◽  
Standard Model ◽  
Symmetry Breaking ◽  
Spontaneous Symmetry Breaking ◽  
Mass Range ◽  
Stellar Mass ◽  
Compact Objects ◽  
The Standard Model

Abstract We construct families, and concrete examples, of simple extensions of the Standard Model that can yield ultralight real or complex vectors or scalars with potential astrophysical relevance. Specifically, the mass range for these putative fundamental bosons (∼ 10-10-10-20 eV) would lead dynamically to both new non-black hole compact objects (bosonic stars) and new non-Kerr black holes, with masses of ∼ M⊙ to ∼ 1010 M⊙, corresponding to the mass range of astrophysical black hole candidates (from stellar mass to supermassive). For each model, we study the properties of the mass spectrum and interactions after spontaneous symmetry breaking, discuss its theoretical viability and caveats, as well as some of its potential and most relevant phenomenological implications linking them to the physics of compact objects.

scholarly journals HIGGS MASS FROM A CASIMIR ENERGY INDUCED COSMOLOGICAL CONSTANT IN THE STANDARD MODEL

2004 ◽  
Vol 19 (13n16) ◽  
pp. 1195-1201
Author(s):  
XIAO-GANG HE
Keyword(s):  
Standard Model ◽  
Symmetry Breaking ◽  
Cosmological Constant ◽  
Spontaneous Symmetry Breaking ◽  
Particle Physics ◽  
Higgs Mass ◽  
Vacuum Energy ◽  
Casimir Energy ◽  
Renormalization Scale ◽  
The Standard Model

Casimir vacuum energy is divergent. It needs to be regularized. The regularization introduces a renormalization scale which may lead to a scale dependent cosmological constant. We show that the requirement of physical cosmological constant is renormalization scale independent provides important constraints on possible particle contents and their masses in particle physics models. In the Standard Model of strong and electroweak interactions, besides the Casimir vacuum energy there is also vacuum energy induced from spontaneous symmetry breaking. The requirement that the total vacuum energy to be scale independent dictates the Higgs mass to be [Formula: see text] where the summation is over fermions and Ni equals to 3 and 1 for quarks and leptons, respectively. The Higgs mass is predicted to be approximately 382 GeV.

scholarly journals Observational evidence for stellar-mass black holes

2006 ◽  
Vol 2 (S238) ◽  
pp. 3-12 ◽  
Author(s):  
Jorge Casares
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Mass Spectrum ◽  
Radial Velocity ◽  
Stellar Mass ◽  
Observational Evidence ◽  
X Ray ◽  
History Of ◽  
X Ray Binaries ◽  
Dynamical Masses

AbstractRadial velocity studies of X-ray binaries provide the most solid evidence for the existence of stellar-mass black holes. We currently have 20 confirmed cases, with dynamical masses in excess of 3 M⊙. Accurate masses have been obtained for a subset of systems which gives us a hint at the mass spectrum of the black hole population. This review summarizes the history of black hole discoveries and presents the latest results in the field.

scholarly journals Hairy magnetic and dyonic black holes in the Standard Model

2021 ◽  
Vol 2021 (4) ◽  
Author(s):  
Yang Bai ◽  
Mrunal Korwar
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Standard Model ◽  
Magnetic Charge ◽  
The Other ◽  
Spherically Symmetric ◽  
Additional Mass ◽  
The Standard Model ◽  
Interesting Object ◽  
Higgs Fields

Abstract Spherically symmetric magnetic and dyonic black holes with a magnetic charge Q = 2 are studied in the Standard Model and general relativity. A magnetically charged black hole with mass below 9.3 × 1035 GeV has a “hairy” cloud of electroweak gauge and Higgs fields outside the event horizon with 1/mW in size. An extremal magnetic black hole has a hair mass of 3.6 TeV, while an extremal dyonic black hole has an additional mass of q2 × 1.6 GeV for a small electric charge q ≪ 2π/e2. A hairy dyonic black hole with an integer charge is not stable and can decay into a magnetic one plus charged fermions. On the other hand, a hairy magnetic black hole can evolve via Hawking radiation into a nearly extremal one that is cosmologically stable and an interesting object to be searched for.

The Higgs Boson

2019 ◽  
pp. 327-342
Author(s):  
Michael E. Peskin
Keyword(s):  
Higgs Boson ◽  
Large Hadron Collider ◽  
Standard Model ◽  
Symmetry Breaking ◽  
Spontaneous Symmetry Breaking ◽  
Hadron Collider ◽  
Higgs Bosons ◽  
The Standard Model

This chapter discusses the Higgs boson, the spin-0 particle in the Standard Model most closely associated with its spontaneous symmetry breaking. It gives the predictions of the Standard Model for the production and decay of Higgs bosons. It describes the experiments at the Large Hadron Collider that test these predictions.

scholarly journals ARE MASSIVE ELEMENTARY PARTICLES BLACK HOLES?

2004 ◽  
Vol 19 (02) ◽  
pp. 143-149 ◽  
Author(s):  
B. F. L. WARD
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Standard Model ◽  
Quantum Gravity ◽  
Point Particle ◽  
Exact Results ◽  
New Approach ◽  
Massive Point ◽  
The Standard Model ◽  
Schwarzschild Radius

We use exact results in a new approach to quantum gravity to study the effect of quantum loop corrections on the behavior of the metric of spacetime near the Schwarzschild radius of a massive point particle in the standard model. We show that the classical conclusion that such a system is a black hole is obviated. Phenomenological implications are discussed.

scholarly journals Dark Spinors Hawking Radiation in String Theory Black Holes

2016 ◽  
Vol 2016 ◽  
pp. 1-7 ◽  
Author(s):  
R. T. Cavalcanti ◽  
Roldão da Rocha
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Standard Model ◽  
Hawking Radiation ◽  
Higgs Field ◽  
Beyond The Standard Model ◽  
The Standard Model ◽  
Mass Dimension ◽  
Dimension One ◽  
Dilaton Black Holes

The Hawking radiation spectrum of Kerr-Sen axion-dilaton black holes is derived, in the context of dark spinors tunnelling across the horizon. Since a black hole has a well defined temperature, it should radiate in principle all the standard model particles, similar to a black body at that temperature. We investigate the tunnelling of mass dimension one spin-1/2 dark fermions, which are beyond the standard model and are prime candidates to the dark matter. Their interactions with the standard model matter and gauge fields are suppressed by at least one power of unification scale, being restricted just to the Higgs field and to the graviton likewise. The tunnelling method for the emission and absorption of mass dimension one particles across the event horizon of Kerr-Sen axion-dilaton black holes is shown here to provide further evidence for the universality of black hole radiation, further encompassing particles beyond the standard model.

Beyond the Standard Model

2019 ◽  
Vol 4 (3) ◽  
Author(s):  
Gordon Kane
Keyword(s):  
Dark Matter ◽  
Standard Model ◽  
Symmetry Breaking ◽  
Spontaneous Symmetry Breaking ◽  
Model Theory ◽  
Beyond The Standard Model ◽  
The Standard Model

Spontaneous symmetry breaking has led physicists to possible solutions that extend the Standard Model theory to include gravity and dark matter candidates.

scholarly journals The lightest of black holes

2014 ◽  
Vol 29 (38) ◽  
pp. 1450204 ◽  
Author(s):  
Xavier Calmet
Keyword(s):  
Black Holes ◽  
General Relativity ◽  
Black Hole ◽  
Standard Model ◽  
Hidden Sector ◽  
Large N ◽  
The Standard Model ◽  
Graviton Propagator ◽  
The Masses ◽  
Number Of Particles

In this paper, we consider general relativity in the large N limit, where N stands for the number of particles in the model. Studying the resummed graviton propagator in the linearized regime, we propose to interpret its complex poles as black hole precursors. Our main result is the calculation of the mass and width of the lightest of black holes. We show that the values of the masses of black hole precursors depend on the number of fields in the theory. Their masses can be lowered down to the TeV region by increasing the number of fields in a hidden sector that only interacts gravitationally with the Standard Model.

scholarly journals ELECTROWEAK RIGHT-HANDED NEUTRINOS AND NEW HIGGS SIGNALS AT THE LHC

2011 ◽  
Vol 26 (17) ◽  
pp. 2865-2880 ◽  
Author(s):  
J. L. DÍAZ-CRUZ ◽  
O. FÉLIX-BELTRÁN ◽  
A. ROSADO ◽  
S. ROSADO-NAVARRO
Keyword(s):  
Standard Model ◽  
Symmetry Breaking ◽  
Spontaneous Symmetry Breaking ◽  
Cross Sections ◽  
Higgs Sector ◽  
Higgs Doublet ◽  
Branching Ratios ◽  
Higgs Potential ◽  
The Standard Model ◽  
Higgs Signal

We explore some aspects of the phenomenology of the Higgs sector in a model that includes right-handed neutrinos, with a mass of the order of the electroweak scale. In this model all scales arise from spontaneous symmetry breaking, thus the Higgs sector includes an extra Higgs singlet, in addition to the Standard Model Higgs doublet. The scalar spectrum includes two neutral CP-even states (h and H, with mh < mH) and a neutral CP-odd state (σ) that can be identified as a pseudo-Majoron. The parameter of the Higgs potential are constrained using a perturbativity criteria, which amounts to solve the corresponding RGE. The relevant Higgs branching ratios and some cross-sections are discussed, with special emphasis on the detection of the invisible Higgs signal at the LHC.

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