In Vedic language, the body is divided into three parts:

1. Sthool sharira (physical body)
2. Sukshma sharira (Subtle body)
3. Karan sharira (Soul)

The physical body (bahya karana or externalization) is made up of Tanmatras and five basic elements. It has five Karmendriyas.

The sukshma sharira has the Gnanendriyas and the antaha karana – manas (mind), buddhi (intellect), ahamkar (ego), chitta (pure intelligence).

Karan sharira is the soul. It is the unmanifest and is omnipotent, omniscient and omnipresent.

In terms of quantum mechanics, sukshma sharira and Karan sharira, after the physical body ends (fermions and bosons), merge into wave particle duality, then the wave, then quantum field and ultimately to the strings (present in 10 dimensions).

As per the theory of everything, the strings are the subtlest of the subtle in the body.

• In Bhagavad Gita the description of field comes in the very first shloka in the form of kshetre which means the field

dhṛtarāṣṭra uvācadharma-kṣetre kuru-kṣetresamavetā yuyutsavaḥmāmakāḥ pāṇḍavāś caivakim akurvata sañjaya

• There is the story of Karkati in Yoga Vasishta (3.27); when she asks the boon of becoming subtlest of the subtle, she became Suchika and Visuchika (needle and mobile needle), which means strings in quantum field [3.35: the demoness became smaller and smaller, of the size of a grain (fermion) and then of the size of a needle)
• In Kena Upanishad (3.6, 3.10), when the Brahman (GOD) asked Agni and Vayu Devta to burn or move the straw / dried grass like a thread they could not burn it or move it. This again means the string state of the Sukshma sharira. 

Dr KK Aggarwal

Padma Shri Awardee

President Elect Confederation of Medical Associations in Asia and Oceania (CMAAO)

Group Editor-in-Chief IJCP Publications

President Heart Care Foundation of India

Past National President IMA